omit unversioned and local dependencies in package lock (#122 )

* omit unversioned and local dependencies in package lock * update package lock for active project only
Add package lock (#121 )
2025-11-17 14:47:30 -05:00 · 2020-05-28 13:29:25 +02:00 · 2020-05-27 19:07:06 +02:00 · 2020-05-19 20:47:12 +02:00 · 2020-05-10 11:21:07 +02:00 · 2020-05-07 23:54:10 +02:00
61 changed files with 2032 additions and 287 deletions
--- a/.github/workflows/macos.yml
+++ b/.github/workflows/macos.yml
@@ -0,0 +1,22 @@
+name: MacOS
+
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+    branches:
+      - master
+
+jobs:
+  build:
+
+    runs-on: macos-latest
+    
+    steps:
+    - uses: actions/checkout@v1
+    
+    - name: run tests
+      run: |
+        cmake -Htest -Bbuild/test
+        cmake --build build/test --target test-verbose
--- a/.github/workflows/publish.yaml
+++ b/.github/workflows/publish.yaml
@@ -0,0 +1,21 @@
+name: Publish
+
+on:
+  push:
+    tags:
+      - '*'
+
+jobs:
+  build:
+    name: Publish CPM.cmake
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v1
+      - name: Upload CPM.cmake to release
+        uses: svenstaro/upload-release-action@v1-release
+        with:
+          repo_token: ${{ secrets.GITHUB_TOKEN }}
+          file: cmake/CPM.cmake
+          asset_name: CPM.cmake
+          tag: ${{ github.ref }}
+          overwrite: true
--- a/.github/workflows/ubuntu.yml
+++ b/.github/workflows/ubuntu.yml
@@ -0,0 +1,29 @@
+name: Ubuntu
+
+on:
+  push:
+    branches:
+    - master
+  pull_request:
+    branches:
+    - master
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+    
+    steps:
+    - uses: actions/checkout@v1
+    
+    - name: install updates
+      run: |
+        wget -O cmake.sh https://cmake.org/files/v3.14/cmake-3.14.0-Linux-x86_64.sh 
+        sudo sh cmake.sh --skip-license --exclude-subdir --prefix=/usr/local
+        export PATH=/usr/local/bin:$PATH
+        cmake --version
+    
+    - name: run tests
+      run: |
+        cmake -Htest -Bbuild/test
+        cmake --build build/test --target test-verbose
--- a/.github/workflows/windows.yml
+++ b/.github/workflows/windows.yml
@@ -0,0 +1,22 @@
+name: Windows
+
+on:
+  push:
+    branches:
+    - master
+  pull_request:
+    branches:
+    - master
+
+jobs:
+  build:
+
+    runs-on: windows-latest
+    
+    steps:
+    - uses: actions/checkout@v1
+    
+    - name: run tests
+      run: |
+        cmake -Htest -Bbuild/test
+        cmake --build build/test --target test-verbose
--- a/.gitignore
+++ b/.gitignore
@@ -1,10 +1,3 @@
-CMakeCache.txt
-CMakeFiles
-CMakeScripts
-Testing
-Makefile
-cmake_install.cmake
-install_manifest.txt
-compile_commands.json
-CTestTestfile.cmake
-build
+/build*
+/.vscode
+*.DS_Store
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,11 +1,13 @@
-
 language: cpp
 sudo: require
+dist: xenial

 common_sources: &all_sources
  - ubuntu-toolchain-r-test
  - llvm-toolchain-trusty
-  - llvm-toolchain-trusty-6.0
+
+python:
+  - 3.7

 matrix:
  include:
@@ -14,7 +16,7 @@ matrix:
      addons: &gcc8
        apt:
          sources: *all_sources
-          packages: 
+          packages:
            - g++-8
      env:
        - MATRIX_EVAL="export CC=gcc-8; export CXX=g++-8;"
@@ -22,11 +24,11 @@ matrix:
    - os: linux
      compiler: clang
      addons:
-          apt:
-              sources: *all_sources
-              packages:
-                - g++-8
-                - clang-6.0
+        apt:
+          sources: *all_sources
+          packages:
+            - g++-8
+            - clang-6.0
      env:
        - MATRIX_EVAL="export CC=clang-6.0; export CXX=clang++-6.0;"

@@ -35,16 +37,14 @@ before_install:
  - eval "${MATRIX_EVAL}"
  - echo "CC=$CC CXX=$CXX"
  # Install a supported cmake version (>= 3.14)
-  - wget -O cmake.sh https://cmake.org/files/v3.14/cmake-3.14.0-Linux-x86_64.sh 
+  - wget -O cmake.sh https://cmake.org/files/v3.14/cmake-3.14.0-Linux-x86_64.sh
  - sudo sh cmake.sh --skip-license --exclude-subdir --prefix=/usr/local
  - export PATH=/usr/local/bin:$PATH
  - cmake --version

 script:
-  - cmake -Hexamples/simple -Bbuild/simple 
-  - cmake --build build/simple
-  - CTEST_OUTPUT_ON_FAILURE=1 cmake --build build/simple --target test
-  - cmake -Hexamples/complex -Bbuild/complex
-  - cmake --build build/complex
-  - CTEST_OUTPUT_ON_FAILURE=1 cmake --build build/complex --target test
- 
+  # unit tests
+  - cmake -Htest -Bbuild/test
+  - cmake --build build/test --target test-verbose
+  # build examples
+  - python3 examples/build_all.py
--- a/README.md
+++ b/README.md
@@ -1,16 +1,55 @@
-[![Build Status](https://travis-ci.com/TheLartians/CPM.svg?branch=master)](https://travis-ci.com/TheLartians/CPM)
+[![Build Status](https://travis-ci.com/TheLartians/CPM.cmake.svg?branch=master)](https://travis-ci.com/TheLartians/CPM.cmake)
+[![Actions Status](https://github.com/TheLartians/CPM.cmake/workflows/MacOS/badge.svg)](https://github.com/TheLartians/CPM.cmake/actions)
+[![Actions Status](https://github.com/TheLartians/CPM.cmake/workflows/Windows/badge.svg)](https://github.com/TheLartians/CPM.cmake/actions)
+[![Actions Status](https://github.com/TheLartians/CPM.cmake/workflows/Ubuntu/badge.svg)](https://github.com/TheLartians/CPM.cmake/actions)

-# CPM
+<p align="center">
+  <img src="./logo/CPM.png" height="100" />
+</p>

-CPM is a simple GIT dependency manager written in CMake. The main use-case is abstracting CMake's `FetchContent` and managing dependencies in small to medium sized projects.
+# Setup-free CMake dependency management

-## Supported projects
+CPM.cmake is a CMake script that adds dependency management capabilities to CMake.
+It's built as a thin wrapper around CMake's [FetchContent](https://cmake.org/cmake/help/latest/module/FetchContent.html) module that adds version control, caching and a simple API.

-Any project that you can add via `add_subdirectory` should already work with CPM.
+## Manage everything
+
+Any downloadable project or resource can be added as a version-controlled dependency though CPM, it is not necessary to modify or package anything.
+Projects using modern CMake are automatically configured and their targets can be used immediately.
+For everything else, the targets can be created manually after the dependency has been downloaded (see the [snippets](#snippets) below for examples).

 ## Usage

-To add a new dependency to your project simply add the Projects target name, the git URL and the version. If the git tag for this version does not match the pattern `v$VERSION`, then the exact branch or tag can be specified with the `GIT_TAG` argument. CMake options can also be supplied with the package.
+After `CPM.cmake` has been [added](#adding-cpm) to your project, the function `CPMAddPackage` or `CPMFindPackage` can be used to fetch and configure a dependency.
+Afterwards, any targets defined in the dependency can be used directly.
+`CPMFindPackage` and `CPMAddPackage` take the following named parameters.
+
+```cmake
+CPMAddPackage(
+  NAME          # The unique name of the dependency (should be the exported target's name)
+  VERSION       # The minimum version of the dependency (optional, defaults to 0)
+  OPTIONS       # Configuration options passed to the dependency (optional)
+  DOWNLOAD_ONLY # If set, the project is downloaded, but not configured (optional)
+  [...]         # Origin parameters forwarded to FetchContent_Declare, see below
+)
+```
+
+The origin may be specified by a `GIT_REPOSITORY`, but other sources, such as direct URLs, are [also supported](https://cmake.org/cmake/help/v3.11/module/ExternalProject.html#external-project-definition).
+If `GIT_TAG` hasn't been explicitly specified it defaults to `v(VERSION)`, a common convention for git projects.
+On the other hand, if `VERSION` hasn't been explicitly specified, CPM can automatically identify the version from the git tag in some common cases. 
+`GIT_TAG` can also be set to a specific commit or a branch name such as `master` to always download the most recent version.
+The optional argument `FIND_PACKAGE_ARGUMENTS` can be specified to a string of parameters that will be passed to `find_package` if enabled (see below).
+
+After calling `CPMAddPackage` or `CPMFindPackage`, the following variables are defined in the local scope, where `<dependency>` is the name of the dependency.
+
+- `<dependency>_SOURCE_DIR` is the path to the source of the dependency.
+- `<dependency>_BINARY_DIR` is the path to the build directory of the dependency.
+- `<dependency>_ADDED` is set to `YES` if the dependency has not been added before, otherwise it is set to `NO`.
+
+The difference between `CPMFindPackage` and `CPMAddPackage` is that `CPMFindPackage` will try to find a local dependency via CMake's `find_package` and fallback to `CPMAddPackage` if the dependency is not found.
+This behaviour can be also modified globally via [CPM options](#options).
+
+## Full CMakeLists Example

 ```cmake
 cmake_minimum_required(VERSION 3.14 FATAL_ERROR)
@@ -18,52 +57,217 @@ cmake_minimum_required(VERSION 3.14 FATAL_ERROR)
 # create project
 project(MyProject)

+# add executable
+add_executable(tests tests.cpp)
+
 # add dependencies
-include(${CMAKE_CURRENT_SOURCE_DIR}/cmake/CPM.cmake)
+include(cmake/CPM.cmake)

 CPMAddPackage(
-  NAME LarsParser
-  VERSION 1.8
-  GIT_REPOSITORY https://github.com/TheLartians/Parser.git
-  GIT_TAG v1.8 # optional here, as indirectly defined by VERSION
-  OPTIONS      # optional CMake arguments passed to the dependency
-    "LARS_PARSER_BUILD_GLUE_EXTENSION ON"
+  NAME Catch2
+  GITHUB_REPOSITORY catchorg/Catch2
+  VERSION 2.5.0
 )

-# add executable
-add_executable(my-project my-project.cpp)
-set_target_properties(my-project PROPERTIES CXX_STANDARD 17)
-target_link_libraries(my-project LarsParser)
+# link dependencies
+target_link_libraries(tests Catch2)
 ```

-See the [examples directory](https://github.com/TheLartians/CPM/tree/master/examples) for more examples.
+See the [examples directory](https://github.com/TheLartians/CPM.cmake/tree/master/examples) for complete examples with source code or the [wiki](https://github.com/TheLartians/CPM.cmake/wiki/More-Snippets) for example snippets.

 ## Adding CPM

 To add CPM to your current project, simply add `cmake/CPM.cmake` to your project's `cmake` directory. The command below will perform this automatically.

 ```bash
-wget -O cmake/CPM.cmake https://raw.githubusercontent.com/TheLartians/CPM/master/cmake/CPM.cmake
+mkdir -p cmake
+wget -O cmake/CPM.cmake https://github.com/TheLartians/CPM.cmake/releases/latest/download/CPM.cmake
 ```

+You can also use CMake to download CPM for you. See the [wiki](https://github.com/TheLartians/CPM.cmake/wiki/Downloading-CPM.cmake-in-CMake) for more details.
+
 ## Updating CPM

-To update CPM to the newest version, simply update the script in the project's cmake directory, for example by running the command above. Dependencies using CPM will automatically use the updated script of the outermost project.
-
-## Options
-
-Setting the CMake option `CPM_USE_LOCAL_PACKAGES` will activate finding packages via `find_package`. If the option `CPM_LOCAL_PACKAGES_ONLY` is set, CPM will only use local packages.
+To update CPM to the newest version, update the script in the project's root directory, for example by running the command above.
+Dependencies using CPM will automatically use the updated script of the outermost project.

 ## Advantages

- **Small repos** CPM takes care of project dependencies, allowing you to focus on creating small, well-tested frameworks.
- **Cross-Plattform** CPM adds projects via `add_subdirectory`, which is compatible with all cmake toolchains and generators.
- **Reproducable builds** By using versioning via git tags it is ensured that a project will always be in the same state everywhere.
- **No installation required** No need to install anything. Just add the script to your project and you're good to go.
- **No Setup required** There is a good chance your existing projects already work as CPM dependencies.
+- **Small and reusable projects** CPM takes care of all project dependencies, allowing developers to focus on creating small, well-tested libraries.
+- **Cross-Platform** CPM adds projects directly at the configure stage and is compatible with all CMake toolchains and generators.
+- **Reproducible builds** By versioning dependencies via git commits or tags it is ensured that a project will always be buildable.
+- **Recursive dependencies** Ensures that no dependency is added twice and all are added in the minimum required version.
+- **Plug-and-play** No need to install anything. Just add the script to your project and you're good to go.
+- **No packaging required** Simply add all external sources as a dependency.
+- **Simple source distribution** CPM makes including projects with source files and dependencies easy, reducing the need for monolithic header files or git submodules.

 ## Limitations

- **First version used** In diamond-shaped dependency graphs (e.g. `A` depends on `C`(v1.1) and `A` depends on `B` depends on `C`(v1.2)) the first added dependency will be used (in this case `C`@1.1). If the current version is older than the version beeing added, or if provided options are incompatible, a CMake warning will be emitted. To resolve, add the new version of the common dependency to the outer project.
- **No auto-update** To update a dependency, version numbers or git tags in the cmake scripts must be adapted manually.
- **No pre-built binaries** Unless they are installed or included in the linked repository.
+- **No pre-built binaries** For every new build directory, all dependencies are initially downloaded and built from scratch. To avoid extra downloads it is recommend to set the [`CPM_SOURCE_CACHE`](#CPM_SOURCE_CACHE) environmental variable. Using a caching compiler such as [ccache](https://github.com/TheLartians/Ccache.cmake) can drastically reduce build time.
+- **Dependent on good CMakeLists** Many libraries do not have CMakeLists that work well for subprojects. Luckily this is slowly changing, however, until then, some manual configuration may be required (see the snippets [below](#snippets) for examples). For best practices on preparing projects for CPM, see the [wiki](https://github.com/TheLartians/CPM.cmake/wiki/Preparing-projects-for-CPM.cmake). 
+- **First version used** In diamond-shaped dependency graphs (e.g. `A` depends on `C`@1.1 and `B`, which itself depends on `C`@1.2 the first added dependency will be used (in this case `C`@1.1). In this case, B requires a newer version of `C` than `A`, so CPM will emit a warning. This can be easily resolved by adding a new version of the dependency in the outermost project, or by introducing a [package lock file](https://github.com/TheLartians/CPM.cmake/wiki/Package-lock).
+
+For projects with more complex needs and where an extra setup step doesn't matter, it may be worth to check out an external C++ package manager such as [vcpkg](https://github.com/microsoft/vcpkg), [conan](https://conan.io) or [hunter](https://github.com/ruslo/hunter).
+Dependencies added with `CPMFindPackage` should work with external package managers.
+Additionally, the option [`CPM_USE_LOCAL_PACKAGES`](#cpmuselocalpackages) will enable `find_package` for all CPM dependencies.
+
+## Options
+
+### CPM_SOURCE_CACHE
+
+To avoid re-downloading dependencies, CPM has an option `CPM_SOURCE_CACHE` that can be passed to CMake as `-DCPM_SOURCE_CACHE=<path to an external download directory>`.
+This will also allow projects to be configured offline, as long as the dependencies have been added to the cache before.
+It may also be defined system-wide as an environmental variable, e.g. by exporting `CPM_SOURCE_CACHE` in your `.bashrc` or `.bash_profile`.
+
+```bash
+export CPM_SOURCE_CACHE=$HOME/.cache/CPM
+```
+
+Note that passing the variable as a configure option to CMake will always override the value set by the environmental variable.
+
+### CPM_DOWNLOAD_ALL
+
+If set, CPM will forward all calls to `CPMFindPackage` as `CPMAddPackage`.
+This is useful to create reproducible builds or to determine if the source parameters have all been set correctly.
+This can also be set as an environmental variable.
+
+### CPM_USE_LOCAL_PACKAGES
+
+CPM can be configured to use `find_package` to search for locally installed dependencies first by setting the CMake option `CPM_USE_LOCAL_PACKAGES`.
+If the option `CPM_LOCAL_PACKAGES_ONLY` is set, CPM will emit an error if the dependency is not found locally.
+These options can also be set as environmental variables.
+
+## Snippets
+
+These examples demonstrate how to include some well-known projects with CPM.
+See the [wiki](https://github.com/TheLartians/CPM.cmake/wiki/More-Snippets) for more snippets.
+
+### [Catch2](https://github.com/catchorg/Catch2)
+
+```cmake
+CPMAddPackage(
+  NAME Catch2
+  GITHUB_REPOSITORY catchorg/Catch2
+  VERSION 2.5.0
+)
+```
+
+### [Boost (via boost-cmake)](https://github.com/Orphis/boost-cmake)
+
+```CMake
+CPMAddPackage(
+  NAME boost-cmake
+  GITHUB_REPOSITORY Orphis/boost-cmake
+  VERSION 1.67.0
+)
+```
+
+### [cxxopts](https://github.com/jarro2783/cxxopts)
+
+```cmake
+CPMAddPackage(
+  NAME cxxopts
+  GITHUB_REPOSITORY jarro2783/cxxopts
+  VERSION 2.2.0
+  OPTIONS
+    "CXXOPTS_BUILD_EXAMPLES Off"
+    "CXXOPTS_BUILD_TESTS Off"
+)
+```
+
+### [Yaml-cpp](https://github.com/jbeder/yaml-cpp)
+
+```CMake
+CPMAddPackage(
+  NAME yaml-cpp
+  GITHUB_REPOSITORY jbeder/yaml-cpp
+  # 0.6.2 uses deprecated CMake syntax
+  VERSION 0.6.3
+  # 0.6.3 is not released yet, so use a recent commit
+  GIT_TAG 012269756149ae99745b6dafefd415843d7420bb 
+  OPTIONS
+    "YAML_CPP_BUILD_TESTS Off"
+    "YAML_CPP_BUILD_CONTRIB Off"
+    "YAML_CPP_BUILD_TOOLS Off"
+)
+```
+
+### [google/benchmark](https://github.com/google/benchmark)
+
+```cmake
+CPMAddPackage(
+  NAME benchmark
+  GITHUB_REPOSITORY google/benchmark
+  VERSION 1.4.1
+  OPTIONS
+    "BENCHMARK_ENABLE_TESTING Off"
+)
+
+if (benchmark_ADDED)
+  # compile with C++17
+  set_target_properties(benchmark PROPERTIES CXX_STANDARD 17)
+endif()
+```
+
+### [nlohmann/json](https://github.com/nlohmann/json)
+
+```cmake
+CPMAddPackage(
+  NAME nlohmann_json
+  VERSION 3.6.1  
+  # the git repo is incredibly large, so we download the archived include directory
+  URL https://github.com/nlohmann/json/releases/download/v3.6.1/include.zip
+  URL_HASH SHA256=69cc88207ce91347ea530b227ff0776db82dcb8de6704e1a3d74f4841bc651cf
+)
+
+if (nlohmann_json_ADDED)
+  add_library(nlohmann_json INTERFACE IMPORTED)
+  target_include_directories(nlohmann_json INTERFACE ${nlohmann_json_SOURCE_DIR})
+endif()
+```
+
+### [Range-v3](https://github.com/ericniebler/range-v3)
+
+```Cmake
+CPMAddPackage(
+  NAME range-v3
+  URL https://github.com/ericniebler/range-v3/archive/0.5.0.zip
+  VERSION 0.5.0
+  # the range-v3 CMakeLists screws with configuration options
+  DOWNLOAD_ONLY True
+)
+
+if(range-v3_ADDED) 
+  add_library(range-v3 INTERFACE IMPORTED)
+  target_include_directories(range-v3 INTERFACE "${range-v3_SOURCE_DIR}/include")
+endif()
+```
+
+### [Lua](https://www.lua.org)
+
+```cmake
+CPMAddPackage(
+  NAME lua
+  GIT_REPOSITORY https://github.com/lua/lua.git
+  VERSION 5.3.5
+  DOWNLOAD_ONLY YES
+)
+
+if (lua_ADDED)
+  # lua has no CMake support, so we create our own target
+
+  FILE(GLOB lua_sources ${lua_SOURCE_DIR}/*.c)
+  add_library(lua STATIC ${lua_sources})
+
+  target_include_directories(lua
+    PUBLIC
+      $<BUILD_INTERFACE:${lua_SOURCE_DIR}>
+  )
+endif()
+```
+
+For a full example on using CPM to download and configure lua with sol2 see [here](examples/sol2).
+
+### Full Examples
+
+See the [examples directory](https://github.com/TheLartians/CPM.cmake/tree/master/examples) for full examples with source code and check out the [wiki](https://github.com/TheLartians/CPM.cmake/wiki/More-Snippets) for many more example snippets.
--- a/cmake/CPM.cmake
+++ b/cmake/CPM.cmake
@@ -1,6 +1,6 @@
-# TheLartians/CPM - A simple Git dependency manager
-# =================================================
-# See https://github.com/TheLartians/CPM for usage and update instructions.
+# CPM.cmake - CMake's missing package manager
+# ===========================================
+# See https://github.com/TheLartians/CPM.cmake for usage and update instructions.
 #
 # MIT License
 # ----------- 
@@ -28,148 +28,438 @@

 cmake_minimum_required(VERSION 3.14 FATAL_ERROR)

-set(CURRENT_CPM_VERSION 0.8) 
+set(CURRENT_CPM_VERSION 0.25.1)

 if(CPM_DIRECTORY)
-  if(NOT ${CPM_DIRECTORY} MATCHES ${CMAKE_CURRENT_LIST_DIR})
-    if (${CPM_VERSION} VERSION_LESS ${CURRENT_CPM_VERSION})
-      message(AUTHOR_WARNING "${CPM_INDENT}\
-A dependency is using a newer CPM version (${CPM_VERSION}) than the current project (${CURRENT_CPM_VERSION}). \
-It is recommended to upgrade CPM to the most recent version. See https://github.com/TheLartians/CPM for more information.\
-")  
+  if(NOT CPM_DIRECTORY STREQUAL CMAKE_CURRENT_LIST_DIR)
+    if (CPM_VERSION VERSION_LESS CURRENT_CPM_VERSION)
+      message(AUTHOR_WARNING "${CPM_INDENT} \
+A dependency is using a more recent CPM version (${CURRENT_CPM_VERSION}) than the current project (${CPM_VERSION}). \
+It is recommended to upgrade CPM to the most recent version. \
+See https://github.com/TheLartians/CPM.cmake for more information."
+      )
    endif()
    return()
  endif()
+
+  get_property(CPM_INITIALIZED GLOBAL "" PROPERTY CPM_INITIALIZED SET)   
+  if (CPM_INITIALIZED)
+    return()
+  endif()
 endif()

+set_property(GLOBAL PROPERTY CPM_INITIALIZED true) 
+
+option(CPM_USE_LOCAL_PACKAGES "Always try to use `find_package` to get dependencies" $ENV{CPM_USE_LOCAL_PACKAGES})
+option(CPM_LOCAL_PACKAGES_ONLY "Only use `find_package` to get dependencies" $ENV{CPM_LOCAL_PACKAGES_ONLY})
+option(CPM_DOWNLOAD_ALL "Always download dependencies from source" $ENV{CPM_DOWNLOAD_ALL})
+option(CPM_DONT_UPDATE_MODULE_PATH "Don't update the module path to allow using find_package" $ENV{CPM_DONT_UPDATE_MODULE_PATH})
+option(CPM_DONT_CREATE_PACKAGE_LOCK "Don't create a package lock file in the binary path" $ENV{CPM_DONT_CREATE_PACKAGE_LOCK})
+option(CPM_INCLUDE_ALL_IN_PACKAGE_LOCK "Add all packages added through CPM.cmake to the package lock" $ENV{CPM_INCLUDE_ALL_IN_PACKAGE_LOCK})
+
 set(CPM_VERSION ${CURRENT_CPM_VERSION} CACHE INTERNAL "")
-
 set(CPM_DIRECTORY ${CMAKE_CURRENT_LIST_DIR} CACHE INTERNAL "")
+set(CPM_FILE ${CMAKE_CURRENT_LIST_FILE} CACHE INTERNAL "")
 set(CPM_PACKAGES "" CACHE INTERNAL "")
+set(CPM_DRY_RUN OFF CACHE INTERNAL "Don't download or configure dependencies (for testing)")

-option(CPM_USE_LOCAL_PACKAGES "Use locally installed packages (find_package)" OFF)
-option(CPM_LOCAL_PACKAGES_ONLY "Use only locally installed packages" OFF)
+if(DEFINED ENV{CPM_SOURCE_CACHE})
+  set(CPM_SOURCE_CACHE_DEFAULT $ENV{CPM_SOURCE_CACHE})
+else()
+  set(CPM_SOURCE_CACHE_DEFAULT OFF)
+endif()
+
+set(CPM_SOURCE_CACHE ${CPM_SOURCE_CACHE_DEFAULT} CACHE PATH "Directory to downlaod CPM dependencies")
+
+if (NOT CPM_DONT_UPDATE_MODULE_PATH)
+  set(CPM_MODULE_PATH "${CMAKE_BINARY_DIR}/CPM_modules" CACHE INTERNAL "")
+  # remove old modules
+  FILE(REMOVE_RECURSE ${CPM_MODULE_PATH})
+  file(MAKE_DIRECTORY ${CPM_MODULE_PATH})
+  # locally added CPM modules should override global packages
+  set(CMAKE_MODULE_PATH "${CPM_MODULE_PATH};${CMAKE_MODULE_PATH}")
+endif()
+
+if (NOT CPM_DONT_CREATE_PACKAGE_LOCK)
+  set(CPM_PACKAGE_LOCK_FILE "${CMAKE_BINARY_DIR}/cpm-package-lock.cmake" CACHE INTERNAL "")
+  file(WRITE ${CPM_PACKAGE_LOCK_FILE} "# CPM Package Lock\n# This file should be committed to version control\n\n")
+endif()

 include(FetchContent)
 include(CMakeParseArguments)

+# Initialize logging prefix
 if(NOT CPM_INDENT)
  set(CPM_INDENT "CPM:")
 endif()

-function(CPMRegisterPackage PACKAGE VERSION)
-  list(APPEND CPM_PACKAGES ${PACKAGE})
-  set(CPM_PACKAGES ${CPM_PACKAGES} CACHE INTERNAL "")
-  set("CPM_PACKAGE_${PACKAGE}_VERSION" ${VERSION} CACHE INTERNAL "")
+function(cpm_find_package NAME VERSION)
+  string(REPLACE " " ";" EXTRA_ARGS "${ARGN}")
+  find_package(${NAME} ${VERSION} ${EXTRA_ARGS} QUIET)
+  if(${CPM_ARGS_NAME}_FOUND)
+    message(STATUS "${CPM_INDENT} using local package ${CPM_ARGS_NAME}@${VERSION}")
+    CPMRegisterPackage(${CPM_ARGS_NAME} "${VERSION}")
+    set(CPM_PACKAGE_FOUND YES PARENT_SCOPE)
+  else()
+    set(CPM_PACKAGE_FOUND NO PARENT_SCOPE)
+  endif()
 endfunction()

-function(CPM_GET_PACKAGE_VERSION PACKAGE)
-  set(CPM_PACKAGE_VERSION "${CPM_PACKAGE_${PACKAGE}_VERSION}" PARENT_SCOPE)
+# Create a custom FindXXX.cmake module for a CPM package
+# This prevents `find_package(NAME)` from finding the system library
+function(CPMCreateModuleFile Name)
+  if (NOT CPM_DONT_UPDATE_MODULE_PATH)
+    # erase any previous modules
+    FILE(WRITE ${CPM_MODULE_PATH}/Find${Name}.cmake "include(${CPM_FILE})\n${ARGN}\nset(${Name}_FOUND TRUE)")
+  endif()
 endfunction()

-function(CPM_PARSE_OPTION OPTION)
-  string(REGEX MATCH "^[^ ]+" OPTION_KEY ${OPTION})
-  string(LENGTH ${OPTION_KEY} OPTION_KEY_LENGTH)
-  math(EXPR OPTION_KEY_LENGTH "${OPTION_KEY_LENGTH}+1")
-  string(SUBSTRING ${OPTION} "${OPTION_KEY_LENGTH}" "-1" OPTION_VALUE)
-  set(OPTION_KEY "${OPTION_KEY}" PARENT_SCOPE)
-  set(OPTION_VALUE "${OPTION_VALUE}" PARENT_SCOPE)
+# Find a package locally or fallback to CPMAddPackage
+function(CPMFindPackage)
+  set(oneValueArgs
+    NAME
+    VERSION
+    FIND_PACKAGE_ARGUMENTS
+  )
+
+  cmake_parse_arguments(CPM_ARGS "" "${oneValueArgs}" "" ${ARGN})
+
+  if (NOT DEFINED CPM_ARGS_VERSION)
+    if (DEFINED CPM_ARGS_GIT_TAG) 
+      cpm_get_version_from_git_tag("${CPM_ARGS_GIT_TAG}" CPM_ARGS_VERSION)
+    endif()
+    if (NOT DEFINED CPM_ARGS_VERSION) 
+      set(CPM_ARGS_VERSION 0)
+    endif()
+  endif()
+
+  if (CPM_DOWNLOAD_ALL)
+    CPMAddPackage(${ARGN})
+    cpm_export_variables(${CPM_ARGS_NAME})
+    return()
+  endif()
+
+  CPMCheckIfPackageAlreadyAdded(${CPM_ARGS_NAME} "${CPM_ARGS_VERSION}" "${CPM_ARGS_OPTIONS}")
+  if (CPM_PACKAGE_ALREADY_ADDED)
+    cpm_export_variables(${CPM_ARGS_NAME})
+    return()
+  endif()
+
+  cpm_find_package(${CPM_ARGS_NAME} "${CPM_ARGS_VERSION}" ${CPM_ARGS_FIND_PACKAGE_ARGUMENTS})
+
+  if(NOT CPM_PACKAGE_FOUND)
+    CPMAddPackage(${ARGN})
+    cpm_export_variables(${CPM_ARGS_NAME})
+  endif()
+
 endfunction()

+# checks if a package has been added before
+function(CPMCheckIfPackageAlreadyAdded CPM_ARGS_NAME CPM_ARGS_VERSION CPM_ARGS_OPTIONS)
+  if ("${CPM_ARGS_NAME}" IN_LIST CPM_PACKAGES)
+    CPMGetPackageVersion(${CPM_ARGS_NAME} CPM_PACKAGE_VERSION)
+    if(${CPM_PACKAGE_VERSION} VERSION_LESS ${CPM_ARGS_VERSION})
+      message(WARNING "${CPM_INDENT} requires a newer version of ${CPM_ARGS_NAME} (${CPM_ARGS_VERSION}) than currently included (${CPM_PACKAGE_VERSION}).")
+    endif()
+    if (CPM_ARGS_OPTIONS)
+      foreach(OPTION ${CPM_ARGS_OPTIONS})
+        cpm_parse_option(${OPTION})
+        if(NOT "${${OPTION_KEY}}" STREQUAL ${OPTION_VALUE})
+          message(WARNING "${CPM_INDENT} ignoring package option for ${CPM_ARGS_NAME}: ${OPTION_KEY} = ${OPTION_VALUE} (${${OPTION_KEY}})")
+        endif()
+      endforeach()
+    endif()
+    cpm_get_fetch_properties(${CPM_ARGS_NAME})
+    SET(${CPM_ARGS_NAME}_ADDED NO)
+    SET(CPM_PACKAGE_ALREADY_ADDED YES PARENT_SCOPE)
+    cpm_export_variables(${CPM_ARGS_NAME})
+  else()
+    SET(CPM_PACKAGE_ALREADY_ADDED NO PARENT_SCOPE)
+  endif()
+endfunction()
+
+# Download and add a package from source
 function(CPMAddPackage)
+
  set(oneValueArgs
    NAME
    VERSION
    GIT_TAG
    DOWNLOAD_ONLY
+    GITHUB_REPOSITORY
+    GITLAB_REPOSITORY
+    GIT_REPOSITORY
+    SOURCE_DIR
+    DOWNLOAD_COMMAND
+    FIND_PACKAGE_ARGUMENTS
  )

  set(multiValueArgs
    OPTIONS
  )

-  cmake_parse_arguments(CPM_ARGS "" "${oneValueArgs}" "${multiValueArgs}" ${ARGN})
+  cmake_parse_arguments(CPM_ARGS "" "${oneValueArgs}" "${multiValueArgs}" "${ARGN}")

-  if(${CPM_USE_LOCAL_PACKAGES} OR ${CPM_LOCAL_PACKAGES_ONLY}) 
-    find_package(${CPM_ARGS_NAME} ${CPM_ARGS_VERSION} QUIET)
+  # Set default values for arguments

-    if(${CPM_PACKAGE_FOUND})
-      message(STATUS "CPM: adding local package ${CPM_ARGS_NAME}@${CPM_ARGS_VERSION}")
-      set_target_properties(${CPM_ARGS_NAME} 
-        PROPERTIES
-          IMPORTED_GLOBAL True
-      )
-      return()
+  if (NOT DEFINED CPM_ARGS_VERSION)
+    if (DEFINED CPM_ARGS_GIT_TAG) 
+      cpm_get_version_from_git_tag("${CPM_ARGS_GIT_TAG}" CPM_ARGS_VERSION)
    endif()
-
-    if(${CPM_LOCAL_PACKAGES_ONLY}) 
-      message(SEND_ERROR "CPM: ${CPM_ARGS_NAME} not found via find_package(${CPM_ARGS_NAME} ${CPM_ARGS_VERSION})")
+    if (NOT DEFINED CPM_ARGS_VERSION) 
+      set(CPM_ARGS_VERSION 0)
    endif()
  endif()

-  if (NOT CPM_ARGS_VERSION)
-    set(CPM_ARGS_VERSION 0)
-  endif()
-
-  if (NOT CPM_ARGS_GIT_TAG)
-    set(CPM_ARGS_GIT_TAG v${CPM_ARGS_VERSION})
-  endif()
-
  if(CPM_ARGS_DOWNLOAD_ONLY)
    set(DOWNLOAD_ONLY ${CPM_ARGS_DOWNLOAD_ONLY})
  else()
    set(DOWNLOAD_ONLY NO)
  endif()

-  if (${CPM_ARGS_NAME} IN_LIST CPM_PACKAGES)
-    CPM_GET_PACKAGE_VERSION(${CPM_ARGS_NAME})
-    if(${CPM_PACKAGE_VERSION} VERSION_LESS ${CPM_ARGS_VERSION})
-      message(WARNING "${CPM_INDENT} newer package ${CPM_ARGS_NAME} requested (${CPM_ARGS_VERSION}, currently using ${CPM_PACKAGE_VERSION})")
+  if (CPM_ARGS_GITHUB_REPOSITORY)
+    set(CPM_ARGS_GIT_REPOSITORY "https://github.com/${CPM_ARGS_GITHUB_REPOSITORY}.git")
+  endif()
+
+  if (CPM_ARGS_GITLAB_REPOSITORY)
+    list(CPM_ARGS_GIT_REPOSITORY "https://gitlab.com/${CPM_ARGS_GITLAB_REPOSITORY}.git")
+  endif()
+
+  if (DEFINED CPM_ARGS_GIT_REPOSITORY)
+    list(APPEND CPM_ARGS_UNPARSED_ARGUMENTS GIT_REPOSITORY ${CPM_ARGS_GIT_REPOSITORY})
+    if (NOT DEFINED CPM_ARGS_GIT_TAG)
+      set(CPM_ARGS_GIT_TAG v${CPM_ARGS_VERSION})
    endif()
-    if (CPM_ARGS_OPTIONS)
-      foreach(OPTION ${CPM_ARGS_OPTIONS})
-        CPM_PARSE_OPTION(${OPTION})
-        if(NOT "${${OPTION_KEY}}" STREQUAL ${OPTION_VALUE})
-          message(WARNING "${CPM_INDENT} ignoring package option for ${CPM_ARGS_NAME}: ${OPTION_KEY} = ${OPTION_VALUE} (${${OPTION_KEY}})")
-        endif()
-      endforeach()
-    endif()
-    CPM_FETCH_PACKAGE(${CPM_ARGS_NAME} ${DOWNLOAD_ONLY})
+  endif()
+
+  if (CPM_ARGS_GIT_TAG)
+    list(APPEND CPM_ARGS_UNPARSED_ARGUMENTS GIT_TAG ${CPM_ARGS_GIT_TAG})
+  endif()
+
+  # Check if package has been added before
+  CPMCheckIfPackageAlreadyAdded(${CPM_ARGS_NAME} "${CPM_ARGS_VERSION}" "${CPM_ARGS_OPTIONS}")
+  if (CPM_PACKAGE_ALREADY_ADDED)
+    cpm_export_variables(${CPM_ARGS_NAME})
    return()
  endif()

+  # Check for available declaration
+  if (DEFINED "CPM_DECLARATION_${CPM_ARGS_NAME}" AND NOT "${CPM_DECLARATION_${CPM_ARGS_NAME}}" STREQUAL "")
+    set(declaration ${CPM_DECLARATION_${CPM_ARGS_NAME}})
+    set(CPM_DECLARATION_${CPM_ARGS_NAME} "")
+    CPMAddPackage(${declaration})
+    set(CPM_DECLARATION_${CPM_ARGS_NAME} "${declaration}")
+    cpm_export_variables(${CPM_ARGS_NAME})
+    # checking again to ensure version and option compatibility
+    CPMCheckIfPackageAlreadyAdded(${CPM_ARGS_NAME} "${CPM_ARGS_VERSION}" "${CPM_ARGS_OPTIONS}")
+    return()
+  endif()
+
+  if(CPM_USE_LOCAL_PACKAGES OR CPM_LOCAL_PACKAGES_ONLY)
+    cpm_find_package(${CPM_ARGS_NAME} "${CPM_ARGS_VERSION}" ${CPM_ARGS_FIND_PACKAGE_ARGUMENTS})
+
+    if(CPM_PACKAGE_FOUND)
+      cpm_export_variables(${CPM_ARGS_NAME})
+      return()
+    endif()
+
+    if(CPM_LOCAL_PACKAGES_ONLY) 
+      message(SEND_ERROR "CPM: ${CPM_ARGS_NAME} not found via find_package(${CPM_ARGS_NAME} ${CPM_ARGS_VERSION})")
+    endif()
+  endif()
+
  CPMRegisterPackage(${CPM_ARGS_NAME} ${CPM_ARGS_VERSION})

  if (CPM_ARGS_OPTIONS)
    foreach(OPTION ${CPM_ARGS_OPTIONS})
-      CPM_PARSE_OPTION(${OPTION})
+      cpm_parse_option(${OPTION})
      set(${OPTION_KEY} ${OPTION_VALUE} CACHE INTERNAL "")
    endforeach()
  endif()

-  CPM_DECLARE_PACKAGE(${CPM_ARGS_NAME} ${CPM_ARGS_VERSION} ${CPM_ARGS_GIT_TAG} "${CPM_ARGS_UNPARSED_ARGUMENTS}")
-  CPM_FETCH_PACKAGE(${CPM_ARGS_NAME} ${DOWNLOAD_ONLY})
+  if (DEFINED CPM_ARGS_GIT_TAG)
+    set(PACKAGE_INFO "${CPM_ARGS_GIT_TAG}")
+  else()
+    set(PACKAGE_INFO "${CPM_ARGS_VERSION}")
+  endif()
+
+  if (DEFINED CPM_ARGS_DOWNLOAD_COMMAND)
+    list(APPEND CPM_ARGS_UNPARSED_ARGUMENTS DOWNLOAD_COMMAND ${CPM_ARGS_DOWNLOAD_COMMAND})
+  elseif(DEFINED CPM_ARGS_SOURCE_DIR)
+    list(APPEND CPM_ARGS_UNPARSED_ARGUMENTS SOURCE_DIR ${CPM_ARGS_SOURCE_DIR})
+  elseif (CPM_SOURCE_CACHE)
+    string(TOLOWER ${CPM_ARGS_NAME} lower_case_name)
+    set(origin_parameters ${CPM_ARGS_UNPARSED_ARGUMENTS})
+    list(SORT origin_parameters)
+    string(SHA1 origin_hash "${origin_parameters}")
+    set(download_directory ${CPM_SOURCE_CACHE}/${lower_case_name}/${origin_hash})
+    list(APPEND CPM_ARGS_UNPARSED_ARGUMENTS SOURCE_DIR ${download_directory})
+    if (EXISTS ${download_directory})
+      # disable the download command to allow offline builds
+      list(APPEND CPM_ARGS_UNPARSED_ARGUMENTS DOWNLOAD_COMMAND "${CMAKE_COMMAND}")
+      set(PACKAGE_INFO "${download_directory}")
+    else()
+      # remove timestamps so CMake will re-download the dependency
+      file(REMOVE_RECURSE ${CMAKE_BINARY_DIR}/_deps/${lower_case_name}-subbuild)
+      set(PACKAGE_INFO "${PACKAGE_INFO} -> ${download_directory}")
+    endif()
+  endif()
+
+  CPMCreateModuleFile(${CPM_ARGS_NAME} "CPMAddPackage(${ARGN})")
+
+  if (CPM_PACKAGE_LOCK_ENABLED)
+    if ((CPM_ARGS_VERSION AND NOT CPM_ARGS_SOURCE_DIR) OR CPM_INCLUDE_ALL_IN_PACKAGE_LOCK)
+      cpm_add_to_package_lock(${CPM_ARGS_NAME} "${ARGN}")
+    elseif(CPM_ARGS_SOURCE_DIR)
+      cpm_add_comment_to_package_lock(${CPM_ARGS_NAME} "local directory")
+    else()
+      cpm_add_comment_to_package_lock(${CPM_ARGS_NAME} "${ARGN}")
+    endif()
+  endif()
+
+  cpm_declare_fetch(${CPM_ARGS_NAME} ${CPM_ARGS_VERSION} ${PACKAGE_INFO} ${CPM_ARGS_UNPARSED_ARGUMENTS})
+  cpm_fetch_package(${CPM_ARGS_NAME} ${DOWNLOAD_ONLY})
+  cpm_get_fetch_properties(${CPM_ARGS_NAME})
+
+  SET(${CPM_ARGS_NAME}_ADDED YES)
+  cpm_export_variables(${CPM_ARGS_NAME})
 endfunction()

-function (CPM_DECLARE_PACKAGE PACKAGE VERSION GIT_TAG)
-  message(STATUS "${CPM_INDENT} adding package ${PACKAGE}@${VERSION} (${GIT_TAG})")
+# Fetch a previously declared package
+macro(CPMGetPackage Name)
+  if (DEFINED "CPM_DECLARATION_${Name}")
+    CPMAddPackage(
+      NAME ${Name}
+    )
+  else()
+    message(SEND_ERROR "Cannot retrieve package ${Name}: no declaration available")
+  endif()
+endmacro()

-  FetchContent_Declare(
-    ${PACKAGE}
-    GIT_TAG ${GIT_TAG}
+# export variables available to the caller to the parent scope
+# expects ${CPM_ARGS_NAME} to be set
+macro(cpm_export_variables name)
+  SET(${name}_SOURCE_DIR "${${name}_SOURCE_DIR}" PARENT_SCOPE)
+  SET(${name}_BINARY_DIR "${${name}_BINARY_DIR}" PARENT_SCOPE)
+  SET(${name}_ADDED "${${name}_ADDED}" PARENT_SCOPE)
+endmacro()
+
+# declares a package, so that any call to CPMAddPackage for the 
+# package name will use these arguments instead 
+macro(CPMDeclarePackage Name)
+  if (NOT DEFINED "CPM_DECLARATION_${Name}")
+    set("CPM_DECLARATION_${Name}" "${ARGN}")
+  endif()
+endmacro()
+
+function(cpm_add_to_package_lock Name)
+  if (NOT CPM_DONT_CREATE_PACKAGE_LOCK)
+    file(APPEND ${CPM_PACKAGE_LOCK_FILE} "# ${Name}\nCPMDeclarePackage(${Name} \"${ARGN}\")\n")
+  endif()
+endfunction()
+
+function(cpm_add_comment_to_package_lock Name)
+  if (NOT CPM_DONT_CREATE_PACKAGE_LOCK)
+    file(APPEND ${CPM_PACKAGE_LOCK_FILE} "# ${Name} (unversioned)\n# CPMDeclarePackage(${Name} \"${ARGN}\")\n")
+  endif()
+endfunction()
+
+# includes the package lock file if it exists and creates a target
+# `cpm-write-package-lock` to update it
+macro(CPMUsePackageLock file)
+  if (NOT CPM_DONT_CREATE_PACKAGE_LOCK)
+    get_filename_component(CPM_ABSOLUTE_PACKAGE_LOCK_PATH ${file} ABSOLUTE)
+    if(EXISTS ${CPM_ABSOLUTE_PACKAGE_LOCK_PATH})
+      include(${CPM_ABSOLUTE_PACKAGE_LOCK_PATH})
+    endif()
+    if (NOT TARGET cpm-update-package-lock)
+      add_custom_target(cpm-update-package-lock COMMAND ${CMAKE_COMMAND} -E copy ${CPM_PACKAGE_LOCK_FILE} ${CPM_ABSOLUTE_PACKAGE_LOCK_PATH})
+    endif()
+    set(CPM_PACKAGE_LOCK_ENABLED true)
+  endif()
+endmacro()
+
+# registers a package that has been added to CPM
+function(CPMRegisterPackage PACKAGE VERSION)
+  list(APPEND CPM_PACKAGES ${PACKAGE})
+  set(CPM_PACKAGES ${CPM_PACKAGES} CACHE INTERNAL "")
+  set("CPM_PACKAGE_${PACKAGE}_VERSION" ${VERSION} CACHE INTERNAL "")
+endfunction()
+
+# retrieve the current version of the package to ${OUTPUT}
+function(CPMGetPackageVersion PACKAGE OUTPUT)
+  set(${OUTPUT} "${CPM_PACKAGE_${PACKAGE}_VERSION}" PARENT_SCOPE)
+endfunction()
+
+# declares a package in FetchContent_Declare 
+function (cpm_declare_fetch PACKAGE VERSION INFO)
+  message(STATUS "${CPM_INDENT} adding package ${PACKAGE}@${VERSION} (${INFO})")
+
+  if (${CPM_DRY_RUN}) 
+    message(STATUS "${CPM_INDENT} package not declared (dry run)")
+    return()
+  endif()
+
+  FetchContent_Declare(${PACKAGE}
    ${ARGN}
  )
 endfunction()

-function (CPM_FETCH_PACKAGE PACKAGE DOWNLOAD_ONLY)  
-  set(CPM_OLD_INDENT "${CPM_INDENT}")
-  set(CPM_INDENT "${CPM_INDENT} ${PACKAGE}:")
-  if(${DOWNLOAD_ONLY})
-    if(NOT "${PACKAGE}_POPULATED")
+# returns properties for a package previously defined by cpm_declare_fetch
+function (cpm_get_fetch_properties PACKAGE)
+  if (${CPM_DRY_RUN}) 
+    return()
+  endif()
+  FetchContent_GetProperties(${PACKAGE})
+  string(TOLOWER ${PACKAGE} lpackage)
+  SET(${PACKAGE}_SOURCE_DIR "${${lpackage}_SOURCE_DIR}" PARENT_SCOPE)
+  SET(${PACKAGE}_BINARY_DIR "${${lpackage}_BINARY_DIR}" PARENT_SCOPE)
+endfunction()
+
+# downloads a previously declared package via FetchContent
+function (cpm_fetch_package PACKAGE DOWNLOAD_ONLY)  
+  if (${CPM_DRY_RUN}) 
+    message(STATUS "${CPM_INDENT} package ${PACKAGE} not fetched (dry run)")
+    return()
+  endif()
+
+  if(DOWNLOAD_ONLY)
+    FetchContent_GetProperties(${PACKAGE})
+    if(NOT ${PACKAGE}_POPULATED)
      FetchContent_Populate(${PACKAGE})
    endif()
  else()
+    set(CPM_OLD_INDENT "${CPM_INDENT}")
+    set(CPM_INDENT "${CPM_INDENT} ${PACKAGE}:")
    FetchContent_MakeAvailable(${PACKAGE})
+    set(CPM_INDENT "${CPM_OLD_INDENT}")
+  endif()
+endfunction()
+
+# splits a package option
+function(cpm_parse_option OPTION)
+  string(REGEX MATCH "^[^ ]+" OPTION_KEY ${OPTION})
+  string(LENGTH ${OPTION} OPTION_LENGTH)
+  string(LENGTH ${OPTION_KEY} OPTION_KEY_LENGTH)
+  if (OPTION_KEY_LENGTH STREQUAL OPTION_LENGTH)
+    # no value for key provided, assume user wants to set option to "ON"
+    set(OPTION_VALUE "ON")
+  else()
+    math(EXPR OPTION_KEY_LENGTH "${OPTION_KEY_LENGTH}+1")
+    string(SUBSTRING ${OPTION} "${OPTION_KEY_LENGTH}" "-1" OPTION_VALUE)
+  endif()
+  set(OPTION_KEY "${OPTION_KEY}" PARENT_SCOPE)
+  set(OPTION_VALUE "${OPTION_VALUE}" PARENT_SCOPE)
+endfunction()
+
+# guesses the package version from a git tag
+function(cpm_get_version_from_git_tag GIT_TAG RESULT)
+  string(LENGTH ${GIT_TAG} length)
+  if (length EQUAL 40) 
+    # GIT_TAG is probably a git hash
+    SET(${RESULT} 0 PARENT_SCOPE)
+  else()
+    string(REGEX MATCH "v?([0123456789.]*).*" _ ${GIT_TAG})
+    SET(${RESULT} ${CMAKE_MATCH_1} PARENT_SCOPE)
  endif()
-  set(CPM_INDENT "${CPM_OLD_INDENT}")
 endfunction()
--- a/cmake/testing.cmake
+++ b/cmake/testing.cmake
@@ -0,0 +1,34 @@
+
+function(ASSERT_EQUAL)
+  if (NOT ARGC EQUAL 2) 
+    message(FATAL_ERROR "assertion failed: invalid argument count: ${ARGC}")
+  endif()
+
+  if (NOT ${ARGV0} STREQUAL ${ARGV1})
+    message(FATAL_ERROR "assertion failed: '${ARGV0}' != '${ARGV1}'")
+  else()
+    message(STATUS "test passed: '${ARGV0}' == '${ARGV1}'")
+  endif()
+endfunction()
+
+function(ASSERT_EMPTY)
+  if (NOT ARGC EQUAL 0) 
+    message(FATAL_ERROR "assertion failed: input ${ARGC} not empty: '${ARGV}'")
+  endif()
+endfunction()
+
+function(ASSERTION_FAILED)
+  message(FATAL_ERROR "assertion failed: ${ARGN}")
+endfunction()
+
+function(ASSERT_EXISTS file)
+  if (NOT EXISTS ${file}) 
+    message(FATAL_ERROR "assertion failed: file ${file} does not exist")
+  endif()
+endfunction()
+
+function(ASSERT_NOT_EXISTS file)
+  if (EXISTS ${file}) 
+    message(FATAL_ERROR "assertion failed: file ${file} exists")
+  endif()
+endfunction()
--- a/examples/benchmark/CMakeLists.txt
+++ b/examples/benchmark/CMakeLists.txt
@@ -0,0 +1,32 @@
+cmake_minimum_required(VERSION 3.14 FATAL_ERROR)
+
+project(CPMExampleBenchmark)
+
+# ---- Dependencies ----
+
+include(../../cmake/CPM.cmake)
+
+CPMAddPackage(
+  NAME fibonacci
+  GIT_REPOSITORY https://github.com/TheLartians/Fibonacci.git
+  VERSION 2.0
+)
+
+CPMAddPackage(
+  NAME benchmark
+  GITHUB_REPOSITORY google/benchmark
+  VERSION 1.5.0
+  OPTIONS
+    "BENCHMARK_ENABLE_TESTING Off"
+)
+
+if (benchmark_ADDED)
+  # patch google benchmark target
+  set_target_properties(benchmark PROPERTIES CXX_STANDARD 17)
+endif()
+
+# ---- Executable ----
+
+add_executable(CPMExampleBenchmark "main.cpp")
+set_target_properties(CPMExampleBenchmark PROPERTIES CXX_STANDARD 17)        
+target_link_libraries(CPMExampleBenchmark fibonacci benchmark)
--- a/examples/benchmark/main.cpp
+++ b/examples/benchmark/main.cpp
@@ -0,0 +1,36 @@
+#include <benchmark/benchmark.h>
+#include <vector>
+#include <algorithm>
+#include <random>
+
+#include <fibonacci.h>
+
+
+std::vector<unsigned> createTestNumbers(){
+  std::vector<unsigned> v;
+  for (int i=0;i<25;++i) v.emplace_back(i);
+  std::random_device rd;
+  std::mt19937 g(rd());
+  std::shuffle(v.begin(), v.end(), g);
+  return v;
+}
+
+void fibonacci(benchmark::State& state) {
+  auto numbers = createTestNumbers();
+  for (auto _ : state) {
+    for (auto v: numbers) benchmark::DoNotOptimize(fibonacci(v));
+  }
+}
+
+BENCHMARK(fibonacci);
+
+void fastFibonacci(benchmark::State& state) {
+  auto numbers = createTestNumbers();
+  for (auto _ : state) {
+    for (auto v: numbers) benchmark::DoNotOptimize(fastFibonacci(v));
+  }
+}
+
+BENCHMARK(fastFibonacci);
+
+BENCHMARK_MAIN();
--- a/examples/boost/CMakeLists.txt
+++ b/examples/boost/CMakeLists.txt
@@ -0,0 +1,21 @@
+cmake_minimum_required(VERSION 3.14 FATAL_ERROR)
+
+project(CPMExampleBoost)
+
+# ---- Create binary ----
+
+add_executable(CPMExampleBoost main.cpp)
+set_target_properties(CPMExampleBoost PROPERTIES CXX_STANDARD 17)
+
+# ---- Dependencies ----
+
+include(../../cmake/CPM.cmake)
+
+CPMFindPackage(
+  NAME Boost
+  GITHUB_REPOSITORY Orphis/boost-cmake
+  VERSION 1.67.0
+  FIND_PACKAGE_ARGUMENTS "COMPONENTS system"
+)
+
+target_link_libraries(CPMExampleBoost PRIVATE Boost::system pthread)
--- a/examples/boost/main.cpp
+++ b/examples/boost/main.cpp
@@ -0,0 +1,30 @@
+//
+// timer.cpp
+// ~~~~~~~~~
+//
+// Copyright (c) 2003-2016 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#include <iostream>
+#include <boost/asio.hpp>
+#include <boost/date_time/posix_time/posix_time.hpp>
+
+void print(const boost::system::error_code& /*e*/)
+{
+  std::cout << "Hello, world!" << std::endl;
+}
+
+int main()
+{
+  boost::asio::io_service io;
+
+  boost::asio::deadline_timer t(io, boost::posix_time::seconds(1));
+  t.async_wait(&print);
+
+  io.run();
+
+  return 0;
+}
--- a/examples/build_all.py
+++ b/examples/build_all.py
@@ -0,0 +1,29 @@
+#!/usr/bin/python3
+
+from pathlib import Path
+from subprocess import PIPE, run
+
+examples = [
+  x for x in Path(__file__).parent.iterdir() if x.is_dir() and (x / 'CMakeLists.txt').exists()
+]
+
+assert(len(examples) > 0)
+
+def runCommand(command):
+  print('- %s' % command)
+  result = run(command, stdout=PIPE, stderr=PIPE, universal_newlines=True, shell=True)
+  if result.returncode != 0:
+    print("error while running '%s':\n" % command, '  ' + str(result.stderr).replace('\n','\n  '))
+    exit(result.returncode)
+  return result.stdout
+
+print('')
+for example in examples:
+  print("running example %s" % example.name)
+  print("================" + ('=' * len(example.name)))
+  project = Path(".") / 'build' / example.name
+  configure = runCommand('cmake -H%s -B%s' % (example, project))
+  print('  ' + '\n  '.join([line for line in configure.split('\n') if 'CPM:' in line]))
+  build = runCommand('cmake --build %s -j4' % (project))
+  print('  ' + '\n  '.join([line for line in build.split('\n') if 'Built target' in line]))
+  print('')
--- a/examples/catch2/CMakeLists.txt
+++ b/examples/catch2/CMakeLists.txt
@@ -0,0 +1,30 @@
+cmake_minimum_required(VERSION 3.14 FATAL_ERROR)
+
+project(CPMExampleCatch2)
+
+# ---- Dependencies ----
+
+include(../../cmake/CPM.cmake)
+
+CPMAddPackage(
+  NAME fibonacci
+  GIT_REPOSITORY https://github.com/TheLartians/Fibonacci.git
+  VERSION 2.0
+)
+
+CPMAddPackage(
+  NAME Catch2
+  GITHUB_REPOSITORY catchorg/Catch2
+  VERSION 2.5.0
+)
+
+# ---- Create binary ----
+
+add_executable(CPMExampleCatch2 main.cpp)
+target_link_libraries(CPMExampleCatch2 fibonacci Catch2)
+set_target_properties(CPMExampleCatch2 PROPERTIES CXX_STANDARD 17)
+
+# ---- Enable testing ----
+
+ENABLE_TESTING() 
+ADD_TEST(CPMExampleCatch2 CPMExampleCatch2)
--- a/examples/catch2/main.cpp
+++ b/examples/catch2/main.cpp
@@ -0,0 +1,20 @@
+#define CATCH_CONFIG_MAIN
+
+#include <catch2/catch.hpp>
+#include <fibonacci.h>
+
+TEST_CASE("fibonacci"){
+  REQUIRE(fibonacci(0) == 0);
+  REQUIRE(fibonacci(1) == 1);
+  REQUIRE(fibonacci(2) == 1);
+  REQUIRE(fibonacci(3) == 2);
+  REQUIRE(fibonacci(4) == 3);
+  REQUIRE(fibonacci(5) == 5);
+  REQUIRE(fibonacci(13) == 233);
+}
+
+TEST_CASE("fastFibonacci"){
+  for (unsigned i=0; i<25; ++i){
+    REQUIRE(fibonacci(i) == fastFibonacci(i));
+  }
+}
--- a/examples/cereal/CMakeLists.txt
+++ b/examples/cereal/CMakeLists.txt
@@ -0,0 +1,22 @@
+cmake_minimum_required(VERSION 3.14 FATAL_ERROR)
+
+project(CPMExampleCereal)
+
+# ---- Dependencies ----
+
+include(../../cmake/CPM.cmake)
+
+CPMAddPackage(
+  NAME cereal
+  VERSION 1.2.2
+  GITHUB_REPOSITORY USCiLab/cereal
+  OPTIONS
+    "SKIP_PORTABILITY_TEST ON"
+    "JUST_INSTALL_CEREAL ON"
+)
+
+# ---- Create binary ----
+
+add_executable(CPMExampleCereal main.cpp)
+target_link_libraries(CPMExampleCereal cereal )
+set_target_properties(CPMExampleCereal PROPERTIES CXX_STANDARD 17)
--- a/examples/cereal/main.cpp
+++ b/examples/cereal/main.cpp
@@ -0,0 +1,34 @@
+#define CATCH_CONFIG_MAIN
+
+#include <cereal/cereal.hpp>
+#include <cereal/archives/json.hpp>
+
+#include <string>
+#include <sstream>
+
+struct player_data 
+{
+  int id{-1};
+  std::string name{};
+};
+
+template<typename Archive>
+void serialize(Archive& archive, player_data const &data)
+{
+  archive(
+    cereal::make_nvp("id", data.id), 
+    cereal::make_nvp("name", data.name)
+  );
+}
+
+int main(int argc, char const *argv[])
+{
+  player_data player{3, "Gamer One"};
+  std::ostringstream oss;
+  cereal::JSONOutputArchive output(oss);
+  output(cereal::make_nvp("player_data", player));
+
+  std::cout << oss.str() << std::endl;
+
+  return 0;
+}
--- a/examples/complex/CMakeLists.txt
+++ b/examples/complex/CMakeLists.txt
@@ -1,55 +0,0 @@
-cmake_minimum_required(VERSION 3.5 FATAL_ERROR)
-
-project(CPMTest)
-
-include(${CMAKE_CURRENT_SOURCE_DIR}/../../cmake/CPM.cmake)
-
-# ignore locally installed projects for reproducable builds
-set(CPM_REMOTE_PACKAGES_ONLY ON CACHE INTERNAL "")
-
-# util library
-CPMAddPackage(
-  NAME LHC
-  GIT_REPOSITORY https://github.com/TheLartians/LHC.git
-  VERSION 0.7
-)
-
-# will be ignored as newer version already added
-CPMAddPackage(
-  NAME LHC
-  GIT_REPOSITORY https://github.com/TheLartians/LHC.git
-  VERSION 0.2
-)
-
-# language bindings
-# uses git tag instead of version identifier
-# depends on visitor library that depends on Event library and LHC
-# CMake configuration arguments passed via OPTIONS
-CPMAddPackage(
-  NAME Glue
-  GIT_TAG 78af65625751ad15a42ca52b842863e85b5d2adc
-  GIT_REPOSITORY https://github.com/TheLartians/Glue.git
-  VERSION 0.5.1
-  OPTIONS 
-    "GLUE_ENABLE_LUA ON"
-    "GLUE_BUILD_LUA ON"
-)
-
-# parser library 
-# depends on LHC and Glue
-CPMAddPackage(
-  NAME LarsParser
-  GIT_REPOSITORY https://github.com/TheLartians/Parser.git
-  VERSION 1.8
-  OPTIONS 
-    "LARS_PARSER_BUILD_GLUE_EXTENSION ON"
-)
-
-# add executable
-add_executable(cpm-test-complex main.cpp)
-set_target_properties(cpm-test-complex PROPERTIES CXX_STANDARD 17)
-target_link_libraries(cpm-test-complex LHC LarsParser Glue)
-
-# tests
-enable_testing()
-add_test(cpm-test-complex cpm-test-complex)
--- a/examples/complex/main.cpp
+++ b/examples/complex/main.cpp
@@ -1,52 +0,0 @@
-#include <lars/parser/extension.h>
-#include <lars/lua_glue.h>
-#include <stdexcept>
-
-int main() {
-  // create lua state
-  auto lua = lars::LuaState();
-  lua.open_libs();
-
-  // create extensions
-  lars::Extension extensions;
-
-  // add parser library to extension
-  extensions.add_extension("parser", lars::extensions::parser());
-
-  // connect parser extension to lua
-  extensions.connect(lua.get_glue());
-
-  // create a parser
-  lua.run(R"(
-    NumberMap = parser.Program.create()
-
-    NumberMap:setRule("Whitespace", "[ \t]")
-    NumberMap:setSeparatorRule("Whitespace")
-
-    NumberMap:setRuleWithCallback("Object", "'{' KeyValue (',' KeyValue)* '}'",function(e) 
-      local N = e:size()-1
-      local res = {}
-      for i=0,N do 
-        local a = e:get(i)
-        res[a:get(0):evaluate()] = a:get(1):evaluate() 
-      end
-      return res
-    end)
-
-    NumberMap:setRule("KeyValue", "Number ':' Number")
-
-    NumberMap:setRuleWithCallback("Number", "'-'? [0-9]+", function(e) return tonumber(e:string()); end)
-    
-    NumberMap:setStartRule("Object")
-  )");
-
-  // parse a string
-  lua.run("m = NumberMap:run('{1:3, 2:-1, 3:42}')");
-  
-  // check result
-  if (lua.get_numeric("m[1]") != 3) throw std::runtime_error("unexpected result");
-  if (lua.get_numeric("m[2]") != -1) throw std::runtime_error("unexpected result");
-  if (lua.get_numeric("m[3]") != 42) throw std::runtime_error("unexpected result");
-
-  return 0;
-}
--- a/examples/cxxopts/CMakeLists.txt
+++ b/examples/cxxopts/CMakeLists.txt
@@ -0,0 +1,22 @@
+cmake_minimum_required(VERSION 3.14 FATAL_ERROR)
+
+project(CPMExampleCXXOpts)
+
+# ---- Dependencies ----
+
+include(../../cmake/CPM.cmake)
+
+CPMAddPackage(
+  NAME cxxopts
+  GITHUB_REPOSITORY jarro2783/cxxopts
+  VERSION 2.2.0
+  OPTIONS
+    "CXXOPTS_BUILD_EXAMPLES Off"
+    "CXXOPTS_BUILD_TESTS Off"
+)
+
+# ---- Create binary ----
+
+add_executable(CPMExampleCXXOpts main.cpp)
+target_link_libraries(CPMExampleCXXOpts cxxopts)
+set_target_properties(CPMExampleCXXOpts PROPERTIES CXX_STANDARD 17)
--- a/examples/cxxopts/main.cpp
+++ b/examples/cxxopts/main.cpp
@@ -0,0 +1,23 @@
+#include <cxxopts.hpp>
+#include <iostream>
+
+int main(int argc, char ** argv) {
+  cxxopts::Options options("MyProgram", "One line description of MyProgram");
+  options.add_options()
+    ("h,help", "Show help")
+    ("d,debug", "Enable debugging")
+    ("f,file", "File name", cxxopts::value<std::string>());
+
+  auto result = options.parse(argc, argv);
+  
+  if (result["help"].as<bool>()) {
+    std::cout << options.help() << std::endl;
+    return 0;
+  }
+
+  for (auto arg: result.arguments()) {
+    std::cout << "option: " << arg.key() << ": " << arg.value() << std::endl;
+  }
+
+  return 0;
+}
--- a/examples/doctest/CMakeLists.txt
+++ b/examples/doctest/CMakeLists.txt
@@ -0,0 +1,30 @@
+cmake_minimum_required(VERSION 3.14 FATAL_ERROR)
+
+project(CPMExampleDoctest)
+
+# ---- Dependencies ----
+
+include(../../cmake/CPM.cmake)
+
+CPMAddPackage(
+  NAME fibonacci
+  GIT_REPOSITORY https://github.com/TheLartians/Fibonacci.git
+  VERSION 2.0
+)
+
+CPMAddPackage(
+  NAME doctest
+  GITHUB_REPOSITORY onqtam/doctest
+  GIT_TAG 2.3.2
+)
+
+# ---- Create binary ----
+
+add_executable(CPMExampleDoctest main.cpp)
+target_link_libraries(CPMExampleDoctest fibonacci doctest)
+set_target_properties(CPMExampleDoctest PROPERTIES CXX_STANDARD 17)
+
+# ---- Enable testing ----
+
+ENABLE_TESTING() 
+ADD_TEST(CPMExampleDoctest CPMExampleDoctest)
--- a/examples/doctest/main.cpp
+++ b/examples/doctest/main.cpp
@@ -0,0 +1,20 @@
+#define DOCTEST_CONFIG_IMPLEMENT_WITH_MAIN
+
+#include <doctest/doctest.h>
+#include <fibonacci.h>
+
+TEST_CASE("fibonacci"){
+  CHECK(fibonacci(0) == 0);
+  CHECK(fibonacci(1) == 1);
+  CHECK(fibonacci(2) == 1);
+  CHECK(fibonacci(3) == 2);
+  CHECK(fibonacci(4) == 3);
+  CHECK(fibonacci(5) == 5);
+  CHECK(fibonacci(13) == 233);
+}
+
+TEST_CASE("fastfibonacci"){
+  for (unsigned i=0; i<25; ++i){
+    CHECK(fibonacci(i) == fastFibonacci(i));
+  }
+}
--- a/examples/entt/CMakeLists.txt
+++ b/examples/entt/CMakeLists.txt
@@ -0,0 +1,26 @@
+cmake_minimum_required(VERSION 3.14 FATAL_ERROR)
+
+project(CPMEnTTExample)
+
+# ---- Dependencies ----
+
+include(../../cmake/CPM.cmake)
+
+CPMAddPackage(
+  NAME EnTT
+  VERSION 3.1.1
+  GITHUB_REPOSITORY skypjack/entt
+  # EnTT's CMakeLists screws with configuration options
+  DOWNLOAD_ONLY True
+)
+
+if (EnTT_ADDED)
+  add_library(EnTT INTERFACE)
+  target_include_directories(EnTT INTERFACE ${EnTT_SOURCE_DIR}/src)
+endif()
+
+# ---- Executable ----
+
+add_executable(CPMEnTTExample "main.cpp")
+set_target_properties(CPMEnTTExample PROPERTIES CXX_STANDARD 17)        
+target_link_libraries(CPMEnTTExample EnTT)
--- a/examples/entt/main.cpp
+++ b/examples/entt/main.cpp
@@ -0,0 +1,54 @@
+#include <entt/entt.hpp>
+#include <cstdint>
+
+struct position {
+    float x;
+    float y;
+};
+
+struct velocity {
+    float dx;
+    float dy;
+};
+
+void update(entt::registry &registry) {
+    auto view = registry.view<position, velocity>();
+
+    for(auto entity: view) {
+        // gets only the components that are going to be used ...
+
+        auto &vel = view.get<velocity>(entity);
+
+        vel.dx = 0.;
+        vel.dy = 0.;
+
+        // ...
+    }
+}
+
+void update(std::uint64_t dt, entt::registry &registry) {
+    registry.view<position, velocity>().each([dt](auto &pos, auto &vel) {
+        // gets all the components of the view at once ...
+
+        pos.x += vel.dx * dt;
+        pos.y += vel.dy * dt;
+
+        // ...
+    });
+}
+
+int main() {
+    entt::registry registry;
+    std::uint64_t dt = 16;
+
+    for(auto i = 0; i < 10; ++i) {
+        auto entity = registry.create();
+        registry.assign<position>(entity, i * 1.f, i * 1.f);
+        if(i % 2 == 0) { registry.assign<velocity>(entity, i * .1f, i * .1f); }
+    }
+
+    update(dt, registry);
+    update(registry);
+
+    // ...
+}
--- a/examples/fmt/CMakeLists.txt
+++ b/examples/fmt/CMakeLists.txt
@@ -0,0 +1,19 @@
+cmake_minimum_required(VERSION 3.14 FATAL_ERROR)
+
+project(CPMJSONExample)
+
+# ---- Dependencies ----
+
+include(../../cmake/CPM.cmake)
+
+CPMAddPackage(
+  NAME fmt
+  GIT_TAG 6.1.2
+  GITHUB_REPOSITORY fmtlib/fmt
+)
+
+# ---- Executable ----
+
+add_executable(CPMFmtExample "main.cpp")
+set_target_properties(CPMFmtExample PROPERTIES CXX_STANDARD 17)        
+target_link_libraries(CPMFmtExample fmt)
--- a/examples/fmt/main.cpp
+++ b/examples/fmt/main.cpp
@@ -0,0 +1,6 @@
+#include <fmt/format.h>
+
+int main(){
+  fmt::print("Hello, {}!\n", "world");
+  return 0;
+}
--- a/examples/gtest/CMakeLists.txt
+++ b/examples/gtest/CMakeLists.txt
@@ -0,0 +1,34 @@
+cmake_minimum_required(VERSION 3.14 FATAL_ERROR)
+
+project(CPMExampleGtest)
+
+# ---- Dependencies ----
+
+include(../../cmake/CPM.cmake)
+
+CPMAddPackage(
+  NAME fibonacci
+  GIT_REPOSITORY https://github.com/TheLartians/Fibonacci.git
+  VERSION 2.0
+)
+
+CPMAddPackage(
+  NAME googletest
+  GITHUB_REPOSITORY google/googletest
+  GIT_TAG release-1.8.1
+  VERSION 1.8.1
+  OPTIONS
+      "INSTALL_GTEST OFF"
+      "gtest_force_shared_crt"
+)
+
+# ---- Create binary ----
+
+add_executable(CPMExampleGtest main.cpp)
+target_link_libraries(CPMExampleGtest fibonacci gtest gtest_main gmock)
+set_target_properties(CPMExampleGtest PROPERTIES CXX_STANDARD 17)
+
+# ---- Enable testing ----
+
+enable_testing() 
+add_test(CPMExampleGtest CPMExampleGtest)
--- a/examples/gtest/main.cpp
+++ b/examples/gtest/main.cpp
@@ -0,0 +1,13 @@
+#include <gtest/gtest.h>
+#include <fibonacci.h>
+
+TEST(FibonacciTests, BasicChecks)
+{
+  ASSERT_TRUE(fibonacci(0) == 0);
+  ASSERT_TRUE(fibonacci(1) == 1);
+  ASSERT_TRUE(fibonacci(2) == 1);
+  ASSERT_TRUE(fibonacci(3) == 2);
+  ASSERT_TRUE(fibonacci(4) == 3);
+  ASSERT_TRUE(fibonacci(5) == 5);
+  ASSERT_TRUE(fibonacci(13) == 233);
+}
--- a/examples/json/CMakeLists.txt
+++ b/examples/json/CMakeLists.txt
@@ -0,0 +1,26 @@
+cmake_minimum_required(VERSION 3.14 FATAL_ERROR)
+
+project(CPMJSONExample)
+
+# ---- Dependencies ----
+
+include(../../cmake/CPM.cmake)
+
+CPMAddPackage(
+  NAME nlohmann_json
+  VERSION 3.6.1  
+  # not using the repo as it takes forever to clone
+  URL https://github.com/nlohmann/json/releases/download/v3.6.1/include.zip
+  URL_HASH SHA256=69cc88207ce91347ea530b227ff0776db82dcb8de6704e1a3d74f4841bc651cf
+)
+
+if(nlohmann_json_ADDED)
+  add_library(nlohmann_json INTERFACE)
+  target_include_directories(nlohmann_json INTERFACE ${nlohmann_json_SOURCE_DIR})
+endif()
+
+# ---- Executable ----
+
+add_executable(CPMJSONExample "main.cpp")
+set_target_properties(CPMJSONExample PROPERTIES CXX_STANDARD 17)        
+target_link_libraries(CPMJSONExample nlohmann_json)
--- a/examples/json/main.cpp
+++ b/examples/json/main.cpp
@@ -0,0 +1,25 @@
+#include <nlohmann/json.hpp>
+#include <iostream>
+#include <iomanip>
+
+int main(){
+  
+  nlohmann::json json = {
+    {"pi", 3.141},
+    {"happy", true},
+    {"name", "Niels"},
+    {"nothing", nullptr},
+    {"answer", {
+      {"everything", 42}
+    }},
+    {"list", {1, 0, 2}},
+    {"object", {
+      {"currency", "USD"},
+      {"value", 42.99}
+    }}
+  };
+
+  std::cout << "declared JSON object: " << std::setw(2) << json << std::endl;
+
+  return 0;
+}
--- a/examples/linenoise/CMakeLists.txt
+++ b/examples/linenoise/CMakeLists.txt
@@ -0,0 +1,24 @@
+cmake_minimum_required(VERSION 3.14 FATAL_ERROR)
+
+project(CPMlinenoiseExample)
+
+# ---- Dependencies ----
+
+include(../../cmake/CPM.cmake)
+
+CPMAddPackage(
+  NAME linenoise
+  GIT_TAG 1.0
+  GITHUB_REPOSITORY antirez/linenoise
+)
+
+if(linenoise_ADDED)
+  add_library(linenoise ${linenoise_SOURCE_DIR}/linenoise.c)
+  target_include_directories(linenoise PUBLIC ${linenoise_SOURCE_DIR})
+endif()
+
+# ---- Executable ----
+
+add_executable(CPMlinenoiseExample "main.cpp")
+set_target_properties(CPMlinenoiseExample PROPERTIES CXX_STANDARD 17)        
+target_link_libraries(CPMlinenoiseExample linenoise)
--- a/examples/linenoise/main.cpp
+++ b/examples/linenoise/main.cpp
@@ -0,0 +1,64 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include "linenoise.h"
+
+
+void completion(const char *buf, linenoiseCompletions *lc) {
+    if (buf[0] == 'h') {
+        linenoiseAddCompletion(lc,"hello");
+        linenoiseAddCompletion(lc,"hello there");
+    }
+}
+
+int main(int argc, char **argv) {
+    char *line;
+    char *prgname = argv[0];
+
+    /* Parse options, with --multiline we enable multi line editing. */
+    while(argc > 1) {
+        argc--;
+        argv++;
+        if (!strcmp(*argv,"--multiline")) {
+            linenoiseSetMultiLine(1);
+            printf("Multi-line mode enabled.\n");
+        } else if (!strcmp(*argv,"--keycodes")) {
+            linenoisePrintKeyCodes();
+            exit(0);
+        } else {
+            fprintf(stderr, "Usage: %s [--multiline] [--keycodes]\n", prgname);
+            exit(1);
+        }
+    }
+
+    /* Set the completion callback. This will be called every time the
+     * user uses the <tab> key. */
+    linenoiseSetCompletionCallback(completion);
+
+    /* Load history from file. The history file is just a plain text file
+     * where entries are separated by newlines. */
+    linenoiseHistoryLoad("history.txt"); /* Load the history at startup */
+
+    /* Now this is the main loop of the typical linenoise-based application.
+     * The call to linenoise() will block as long as the user types something
+     * and presses enter.
+     *
+     * The typed string is returned as a malloc() allocated string by
+     * linenoise, so the user needs to free() it. */
+    while((line = linenoise("hello> ")) != NULL) {
+        /* Do something with the string. */
+        if (line[0] != '\0' && line[0] != '/') {
+            printf("echo: '%s'\n", line);
+            linenoiseHistoryAdd(line); /* Add to the history. */
+            linenoiseHistorySave("history.txt"); /* Save the history on disk. */
+        } else if (!strncmp(line,"/historylen",11)) {
+            /* The "/historylen" command will change the history len. */
+            int len = atoi(line+11);
+            linenoiseHistorySetMaxLen(len);
+        } else if (line[0] == '/') {
+            printf("Unreconized command: %s\n", line);
+        }
+        free(line);
+    }
+    return 0;
+}
--- a/examples/range-v3/CMakeLists.txt
+++ b/examples/range-v3/CMakeLists.txt
@@ -0,0 +1,26 @@
+cmake_minimum_required(VERSION 3.14 FATAL_ERROR)
+
+project(CPMRangev3Example)
+
+# ---- Dependencies ----
+
+include(../../cmake/CPM.cmake)
+
+CPMAddPackage(
+  NAME range-v3
+  URL https://github.com/ericniebler/range-v3/archive/0.5.0.zip
+  VERSION 0.5.0
+  # the range-v3 CMakeLists screws with configuration options
+  DOWNLOAD_ONLY True
+)
+
+if(range-v3_ADDED) 
+  add_library(range-v3 INTERFACE IMPORTED)
+  target_include_directories(range-v3 INTERFACE "${range-v3_SOURCE_DIR}/include")
+endif()
+
+# ---- Executable ----
+
+add_executable(CPMRangev3Example "main.cpp")
+set_target_properties(CPMRangev3Example PROPERTIES CXX_STANDARD 17)        
+target_link_libraries(CPMRangev3Example range-v3)
--- a/examples/range-v3/main.cpp
+++ b/examples/range-v3/main.cpp
@@ -0,0 +1,44 @@
+// Range v3 library
+//
+//  Copyright Jeff Garland 2017
+//
+//  Use, modification and distribution is subject to the
+//  Boost Software License, Version 1.0. (See accompanying
+//  file LICENSE_1_0.txt or copy at
+//  http://www.boost.org/LICENSE_1_0.txt)
+//
+// Project home: https://github.com/ericniebler/range-v3
+//
+
+//[any_all_none_of]]
+// Demonstrates any_of, all_of, none_of
+// output
+// vector: [6,2,3,4,5,6]
+// vector any_of is_six: true
+// vector all_of is_six: false
+// vector none_of is_six: false
+
+#include <range/v3/algorithm/all_of.hpp>
+#include <range/v3/algorithm/any_of.hpp>
+#include <range/v3/algorithm/for_each.hpp>
+#include <range/v3/algorithm/none_of.hpp>
+#include <range/v3/view/all.hpp>
+
+#include <iostream>
+#include <vector>
+using std::cout;
+
+auto is_six = [](int i) { return i == 6; };
+
+int
+main()
+{
+    std::vector<int> v{6, 2, 3, 4, 5, 6};
+    cout << std::boolalpha;
+    cout << "vector: " << ranges::view::all(v) << '\n';
+
+    cout << "vector any_of is_six: " << ranges::any_of(v, is_six) << '\n';
+    cout << "vector all_of is_six: " << ranges::all_of(v, is_six) << '\n';
+    cout << "vector none_of is_six: " << ranges::none_of(v, is_six) << '\n';
+}
+//[any_all_none_of]]
--- a/examples/simple/CMakeLists.txt
+++ b/examples/simple/CMakeLists.txt
@@ -1,21 +0,0 @@
-cmake_minimum_required(VERSION 3.5 FATAL_ERROR)
-
-project(CPMTest)
-
-# add dependencies
-include(${CMAKE_CURRENT_SOURCE_DIR}/../../cmake/CPM.cmake)
-
-CPMAddPackage(
-  NAME LarsParser
-  GIT_REPOSITORY https://github.com/TheLartians/Parser.git
-  VERSION 1.7
-)
-
-# add executable
-add_executable(cpm-test-simple main.cpp)
-set_target_properties(cpm-test-simple PROPERTIES CXX_STANDARD 17)
-target_link_libraries(cpm-test-simple LarsParser)
-
-# tests
-enable_testing()
-add_test(cpm-test-simple cpm-test-simple)
--- a/examples/simple/main.cpp
+++ b/examples/simple/main.cpp
@@ -1,27 +0,0 @@
-#include <lars/parser/generator.h>
-
-int main() {
-  lars::ParserGenerator<float> g;
-
-  // Define grammar and evaluation rules
-  g.setSeparator(g["Whitespace"] << "[\t ]");
-  g["Sum"     ] << "Add | Subtract | Product";
-  g["Product" ] << "Multiply | Divide | Atomic";
-  g["Atomic"  ] << "Number | '(' Sum ')'";
-  g["Add"     ] << "Sum '+' Product"    >> [](auto e){ return e[0].evaluate() + e[1].evaluate(); };
-  g["Subtract"] << "Sum '-' Product"    >> [](auto e){ return e[0].evaluate() - e[1].evaluate(); };
-  g["Multiply"] << "Product '*' Atomic" >> [](auto e){ return e[0].evaluate() * e[1].evaluate(); };
-  g["Divide"  ] << "Product '/' Atomic" >> [](auto e){ return e[0].evaluate() / e[1].evaluate(); };
-  g["Number"  ] << "'-'? [0-9]+ ('.' [0-9]+)?" >> [](auto e){ return stof(e.string()); };
-  g.setStart(g["Sum"]);
-
-  // Execute a string
-  float result = g.run("1 + 2 * (3+4)/2 - 3");
-
-  // validate result
-  if (result == 5) {
-    return 0;
-  } else {
-    return 1;
-  }
-}
--- a/examples/simple_match/CMakeLists.txt
+++ b/examples/simple_match/CMakeLists.txt
@@ -0,0 +1,26 @@
+cmake_minimum_required(VERSION 3.14 FATAL_ERROR)
+
+project(CPMSimpleMatchExample)
+
+# ---- Dependencies ----
+
+include(../../cmake/CPM.cmake)
+
+CPMAddPackage(
+  NAME simple_match
+  GIT_REPOSITORY https://github.com/jbandela/simple_match.git
+  GIT_TAG a3ab17f3d98db302de68ad85ed399a42ae41889e
+  DOWNLOAD_ONLY True
+)
+
+if(simple_match_ADDED)
+  add_library(simple_match INTERFACE IMPORTED)
+  target_include_directories(simple_match INTERFACE "${simple_match_SOURCE_DIR}/include")
+endif()
+
+# ---- Executable ----
+
+add_executable(CPMSimpleMatchExample "main.cpp")
+set_target_properties(CPMSimpleMatchExample PROPERTIES CXX_STANDARD 17)        
+target_link_libraries(CPMSimpleMatchExample simple_match)
+
--- a/examples/simple_match/main.cpp
+++ b/examples/simple_match/main.cpp
@@ -0,0 +1,34 @@
+#include <simple_match/simple_match.hpp>
+
+#include <iostream>
+
+int main(int argc, char ** argv){
+  using namespace simple_match;
+  using namespace simple_match::placeholders;
+
+  std::string input;
+  std::cout << "please enter a number or 'quit' to exit" << std::endl;
+
+  while (true) {
+    std::cout << "> ";
+    std::getline(std::cin, input);
+    if (input == "quit") { break; }
+    int x;
+    try {
+      x = std::stoi(input);
+    } catch(std::invalid_argument &) {
+      std::cout << "invalid input" << std::endl;
+      continue;
+    }
+    
+    match(x,
+      1, []() {std::cout << "The answer is one\n"; },
+      2, []() {std::cout << "The answer is two\n"; },
+      _x < 10, [](auto&& a) {std::cout << "The answer " << a << " is less than 10\n"; },
+      10 < _x < 20,	[](auto&& a) {std::cout << "The answer " << a  << " is between 10 and 20 exclusive\n"; },
+      _, []() {std::cout << "Did not match\n"; }
+    );
+  }
+
+  return 0;
+}
--- a/examples/sol2/CMakeLists.txt
+++ b/examples/sol2/CMakeLists.txt
@@ -0,0 +1,47 @@
+cmake_minimum_required(VERSION 3.14 FATAL_ERROR)
+
+project(CPMSol2Example)
+
+# ---- Dependencies ----
+
+include(../../cmake/CPM.cmake)
+
+CPMAddPackage(
+  NAME lua
+  GIT_REPOSITORY https://github.com/lua/lua.git
+  VERSION 5.3.5
+  DOWNLOAD_ONLY YES
+)
+
+if (lua_ADDED)
+  # lua has no CMakeLists, so we create our own target
+
+  FILE(GLOB lua_sources ${lua_SOURCE_DIR}/*.c)
+  add_library(lua STATIC ${lua_sources})
+
+  target_include_directories(lua
+    PUBLIC
+      $<BUILD_INTERFACE:${lua_SOURCE_DIR}>
+  )
+endif()
+
+
+CPMAddPackage(
+  NAME sol2
+  URL https://github.com/ThePhD/sol2/archive/v3.0.2.zip
+  VERSION 3.0.2
+  DOWNLOAD_ONLY YES
+)
+
+if (sol2_ADDED)
+  add_library(sol2 INTERFACE IMPORTED)
+  target_include_directories(sol2 INTERFACE ${sol2_SOURCE_DIR}/include)
+  target_link_libraries(sol2 INTERFACE lua)
+endif()
+
+# ---- Executable ----
+
+add_executable(CPMSol2Example "main.cpp")
+set_target_properties(CPMSol2Example PROPERTIES CXX_STANDARD 17)        
+target_link_libraries(CPMSol2Example sol2)
+
--- a/examples/sol2/main.cpp
+++ b/examples/sol2/main.cpp
@@ -0,0 +1,16 @@
+#include <sol/sol.hpp>
+#include <cassert>
+
+struct vars {
+    int boop = 0;
+};
+
+int main() {
+    sol::state lua;
+    lua.open_libraries( sol::lib::base );
+    lua.new_usertype<vars>("vars", "boop", &vars::boop);
+    lua.script("beep = vars.new()\n"
+               "beep.boop = 1\n"
+               "print('beep boop')");
+    assert(lua.get<vars>("beep").boop == 1);
+}
--- a/examples/yaml/CMakeLists.txt
+++ b/examples/yaml/CMakeLists.txt
@@ -0,0 +1,27 @@
+cmake_minimum_required(VERSION 3.14 FATAL_ERROR)
+
+project(CPMYamlExample)
+
+# ---- Dependencies ----
+
+include(../../cmake/CPM.cmake)
+
+CPMAddPackage(
+  NAME yaml-cpp
+  GIT_REPOSITORY https://github.com/jbeder/yaml-cpp.git
+  # 0.6.2 uses deprecated CMake syntax
+  VERSION 0.6.3                                  
+  # 0.6.3 is not released yet, so use the most recent commit
+  GIT_TAG 012269756149ae99745b6dafefd415843d7420bb 
+  OPTIONS
+    "YAML_CPP_BUILD_TESTS Off"
+    "YAML_CPP_BUILD_CONTRIB Off"
+    "YAML_CPP_BUILD_TOOLS Off"
+)
+
+# ---- Executable ----
+
+add_executable(CPMYamlExample "main.cpp")
+set_target_properties(CPMYamlExample PROPERTIES CXX_STANDARD 17)        
+target_link_libraries(CPMYamlExample yaml-cpp)
+
--- a/examples/yaml/main.cpp
+++ b/examples/yaml/main.cpp
@@ -0,0 +1,14 @@
+#include <yaml-cpp/yaml.h>
+#include <iostream>
+
+int main(int argc, char ** argv){
+  if (argc != 2) {
+    std::cout << "usage: " << argv[0] << " <path to yaml file>" << std::endl;
+    return 1;
+  }
+
+  YAML::Node config = YAML::LoadFile(argv[1]);
+  std::cout << "Parsed YAML:\n" << config << std::endl;
+
+  return 0;
+}
--- a/examples/yaml/monsters.yaml
+++ b/examples/yaml/monsters.yaml
@@ -0,0 +1,21 @@
+- name: Ogre
+  position: [0, 5, 0]
+  powers:
+    - name: Club
+      damage: 10
+    - name: Fist
+      damage: 8
+- name: Dragon
+  position: [1, 0, 10]
+  powers:
+    - name: Fire Breath
+      damage: 25
+    - name: Claws
+      damage: 15
+- name: Wizard
+  position: [5, -3, 0]
+  powers:
+    - name: Acid Rain
+      damage: 50
+    - name: Staff
+      damage: 3
--- a/logo/CPM.afdesign
+++ b/logo/CPM.afdesign
--- a/logo/CPM.png
+++ b/logo/CPM.png
--- a/test/CMakeLists.txt
+++ b/test/CMakeLists.txt
@@ -0,0 +1,17 @@
+cmake_minimum_required(VERSION 3.14 FATAL_ERROR)
+
+project(CPMTests)
+
+file(GLOB tests "${CMAKE_CURRENT_SOURCE_DIR}/unit/*.cmake")
+
+enable_testing()
+
+foreach(test ${tests})
+  message(STATUS "adding test: ${test}")
+  add_test(
+    NAME ${test} 
+    COMMAND ${CMAKE_COMMAND} -DCPM_PATH=${CMAKE_CURRENT_SOURCE_DIR}/../cmake -P "${test}"
+  )
+endforeach()
+
+add_custom_target(test-verbose COMMAND ${CMAKE_CTEST_COMMAND} -C Debug --verbose)
--- a/test/unit/cache.cmake
+++ b/test/unit/cache.cmake
@@ -0,0 +1,132 @@
+cmake_minimum_required(VERSION 3.14 FATAL_ERROR)
+
+include(${CPM_PATH}/testing.cmake)
+include(CMakePackageConfigHelpers)
+
+
+set(CPM_SOURCE_CACHE_DIR "${CMAKE_CURRENT_BINARY_DIR}/CPM")
+set(TEST_BUILD_DIR ${CMAKE_CURRENT_BINARY_DIR}/cache)
+
+function(clear_cache)
+  message(STATUS "clearing CPM cache")
+  FILE(REMOVE_RECURSE ${CPM_SOURCE_CACHE_DIR})
+  
+  if (EXISTS "${CPM_SOURCE_CACHE_DIR}")
+    ASSERTION_FAILED("cache not cleared")
+  endif()
+endfunction()
+
+function(update_cmake_lists)
+  configure_package_config_file(
+    "${CMAKE_CURRENT_LIST_DIR}/cache/CMakeLists.txt.in"
+    "${CMAKE_CURRENT_LIST_DIR}/cache/CMakeLists.txt"
+    INSTALL_DESTINATION ${CMAKE_CURRENT_BINARY_DIR}/junk
+  )
+endfunction()
+
+function(reset_test)
+  clear_cache()
+  FILE(REMOVE_RECURSE ${TEST_BUILD_DIR})
+  update_cmake_lists()
+endfunction()
+
+set(FIBONACCI_VERSION 1.0)
+
+## Read CPM_SOURCE_CACHE from arguments
+
+reset_test()
+
+execute_process(
+  COMMAND 
+  ${CMAKE_COMMAND} "-H${CMAKE_CURRENT_LIST_DIR}/cache" "-B${TEST_BUILD_DIR}" "-DCPM_SOURCE_CACHE=${CPM_SOURCE_CACHE_DIR}"
+  RESULT_VARIABLE ret
+)
+
+ASSERT_EQUAL(${ret} "0")
+
+if (NOT EXISTS "${CPM_SOURCE_CACHE_DIR}/fibonacci")
+  ASSERTION_FAILED("fibonacci not in cache")
+endif()
+
+FILE(GLOB FIBONACCI_VERSIONs "${CPM_SOURCE_CACHE_DIR}/fibonacci/*")
+list(LENGTH FIBONACCI_VERSIONs FIBONACCI_VERSION_count)
+ASSERT_EQUAL(${FIBONACCI_VERSION_count} "1")
+
+FILE(GLOB fibonacci_versions "${CPM_SOURCE_CACHE_DIR}/fibonacci/*")
+list(LENGTH fibonacci_versions fibonacci_version_count)
+ASSERT_EQUAL(${fibonacci_version_count} "1")
+
+## Update dependency and keep CPM_SOURCE_CACHE
+
+set(FIBONACCI_VERSION 2.0)
+update_cmake_lists()
+
+execute_process(
+  COMMAND 
+  ${CMAKE_COMMAND} ${TEST_BUILD_DIR}
+  RESULT_VARIABLE ret
+)
+
+ASSERT_EQUAL(${ret} "0")
+
+FILE(GLOB FIBONACCI_VERSIONs "${CPM_SOURCE_CACHE_DIR}/fibonacci/*")
+list(LENGTH FIBONACCI_VERSIONs FIBONACCI_VERSION_count)
+ASSERT_EQUAL(${FIBONACCI_VERSION_count} "2")
+
+## Clear cache and update
+
+clear_cache()
+
+execute_process(
+  COMMAND 
+  ${CMAKE_COMMAND} ${TEST_BUILD_DIR}
+  RESULT_VARIABLE ret
+)
+
+ASSERT_EQUAL(${ret} "0")
+
+if (NOT EXISTS "${CPM_SOURCE_CACHE_DIR}/fibonacci")
+  ASSERTION_FAILED("fibonacci not in cache")
+endif()
+
+## Read CPM_SOURCE_CACHE from environment
+
+reset_test()
+
+execute_process(
+  COMMAND 
+  ${CMAKE_COMMAND} -E env "CPM_SOURCE_CACHE=${CPM_SOURCE_CACHE_DIR}" ${CMAKE_COMMAND} "-H${CMAKE_CURRENT_LIST_DIR}/cache" "-B${TEST_BUILD_DIR}"
+  RESULT_VARIABLE ret
+)
+
+ASSERT_EQUAL(${ret} "0")
+
+if (NOT EXISTS "${CPM_SOURCE_CACHE_DIR}/fibonacci")
+  ASSERTION_FAILED("fibonacci not in cache")
+endif()
+
+## Reuse cached packages for other build
+
+execute_process(
+  COMMAND 
+  ${CMAKE_COMMAND} -E env "CPM_SOURCE_CACHE=${CPM_SOURCE_CACHE_DIR}" ${CMAKE_COMMAND} "-H${CMAKE_CURRENT_LIST_DIR}/cache" "-B${TEST_BUILD_DIR}-2"
+  RESULT_VARIABLE ret
+)
+
+ASSERT_EQUAL(${ret} "0")
+
+## Overwrite CPM_SOURCE_CACHE with argument
+
+reset_test()
+
+execute_process(
+  COMMAND 
+  ${CMAKE_COMMAND} -E env "CPM_SOURCE_CACHE=${CMAKE_CURRENT_BINARY_DIR}/junk" ${CMAKE_COMMAND} "-H${CMAKE_CURRENT_LIST_DIR}/cache" "-B${TEST_BUILD_DIR}" "-DCPM_SOURCE_CACHE=${CPM_SOURCE_CACHE_DIR}"
+  RESULT_VARIABLE ret
+)
+
+ASSERT_EQUAL(${ret} "0")
+
+if (NOT EXISTS "${CPM_SOURCE_CACHE_DIR}/fibonacci")
+  ASSERTION_FAILED("fibonacci not in cache")
+endif()
--- a/test/unit/cache/.gitignore
+++ b/test/unit/cache/.gitignore
@@ -0,0 +1 @@
+/CMakeLists.txt
--- a/test/unit/cache/CMakeLists.txt.in
+++ b/test/unit/cache/CMakeLists.txt.in
@@ -0,0 +1,23 @@
+cmake_minimum_required(VERSION 3.14 FATAL_ERROR)
+
+project(CPMExampleCatch2)
+
+# ---- Options ----
+
+option(ENABLE_TEST_COVERAGE "Enable test coverage" OFF)
+
+# ---- Dependencies ----
+
+include(@CPM_PATH@/CPM.cmake)
+
+CPMAddPackage(
+  NAME fibonacci
+  GIT_REPOSITORY https://github.com/TheLartians/Fibonacci.git
+  VERSION @FIBONACCI_VERSION@
+)
+
+# ---- Create binary ----
+
+add_executable(CPMExampleCatch2 main.cpp)
+target_link_libraries(CPMExampleCatch2 fibonacci)
+set_target_properties(CPMExampleCatch2 PROPERTIES CXX_STANDARD 17 COMPILE_FLAGS "-Wall -pedantic -Wextra -Werror")
--- a/test/unit/cache/main.cpp
+++ b/test/unit/cache/main.cpp
@@ -0,0 +1,9 @@
+#define CATCH_CONFIG_MAIN
+
+#include <fibonacci.h>
+#include <iostream>
+
+int main(){
+  std::cout << "fib(10) = " << fastFibonacci(10) << std::endl;
+  return 0;
+}
--- a/test/unit/dependency_properties.cmake
+++ b/test/unit/dependency_properties.cmake
@@ -0,0 +1,41 @@
+cmake_minimum_required(VERSION 3.14 FATAL_ERROR)
+
+include(${CPM_PATH}/CPM.cmake)
+include(${CPM_PATH}/testing.cmake)
+
+set(CPM_DRY_RUN ON)
+
+CPMAddPackage(
+  NAME A
+  GIT_TAG 1.2.3
+)
+
+CPMAddPackage(
+  NAME A
+  VERSION 1.2.3
+)
+
+CPMGetPackageVersion(A VERSION)
+ASSERT_EQUAL(${VERSION} "1.2.3")
+
+CPMAddPackage(
+  NAME B
+  VERSION 2.4.1
+)
+
+CPMAddPackage(
+  NAME B
+  GIT_TAG v2.3.1
+)
+
+CPMGetPackageVersion(B VERSION)
+ASSERT_EQUAL(${VERSION} "2.4.1")
+
+CPMAddPackage(
+  NAME C
+  GIT_TAG v3.1.2-a
+  VERSION 3.1.2
+)
+
+CPMGetPackageVersion(C VERSION)
+ASSERT_EQUAL(${VERSION} "3.1.2")
--- a/test/unit/modules.cmake
+++ b/test/unit/modules.cmake
@@ -0,0 +1,30 @@
+
+include(CMakePackageConfigHelpers)
+include(${CPM_PATH}/testing.cmake)
+
+set(TEST_BUILD_DIR ${CMAKE_CURRENT_BINARY_DIR}/modules)
+
+function(initProjectWithDependency TEST_DEPENDENCY_NAME)
+  configure_package_config_file(
+    "${CMAKE_CURRENT_LIST_DIR}/test_project/ModuleCMakeLists.txt.in"
+    "${CMAKE_CURRENT_LIST_DIR}/test_project/CMakeLists.txt"
+    INSTALL_DESTINATION ${CMAKE_CURRENT_BINARY_DIR}/junk
+  )
+
+  execute_process(
+    COMMAND 
+    ${CMAKE_COMMAND} "-H${CMAKE_CURRENT_LIST_DIR}/test_project" "-B${TEST_BUILD_DIR}"
+    RESULT_VARIABLE ret
+  )
+
+  ASSERT_EQUAL(${ret} "0")
+endfunction()
+
+initProjectWithDependency(A)
+ASSERT_EXISTS(${TEST_BUILD_DIR}/CPM_modules)
+ASSERT_EXISTS(${TEST_BUILD_DIR}/CPM_modules/FindA.cmake)
+ASSERT_NOT_EXISTS(${TEST_BUILD_DIR}/CPM_modules/FindB.cmake)
+
+initProjectWithDependency(B)
+ASSERT_NOT_EXISTS(${TEST_BUILD_DIR}/CPM_modules/FindA.cmake)
+ASSERT_EXISTS(${TEST_BUILD_DIR}/CPM_modules/FindB.cmake)
--- a/test/unit/package-lock.cmake
+++ b/test/unit/package-lock.cmake
@@ -0,0 +1,48 @@
+
+include(CMakePackageConfigHelpers)
+include(${CPM_PATH}/testing.cmake)
+
+set(TEST_BUILD_DIR ${CMAKE_CURRENT_BINARY_DIR}/package-lock)
+
+function(configureWithDeclare DECLARE_DEPENDENCY)
+  execute_process(COMMAND ${CMAKE_COMMAND} -E rm -rf ${TEST_BUILD_DIR})
+
+  if (DECLARE_DEPENDENCY)
+    set(PREPARE_CODE "CPMDeclarePackage(Dependency
+      NAME Dependency 
+      SOURCE_DIR ${CMAKE_CURRENT_LIST_DIR}/test_project/dependency
+    )")
+  else()
+    set(PREPARE_CODE "")
+  endif()
+
+  configure_package_config_file(
+    "${CMAKE_CURRENT_LIST_DIR}/test_project/PackageLockCMakeLists.txt.in"
+    "${CMAKE_CURRENT_LIST_DIR}/test_project/CMakeLists.txt"
+    INSTALL_DESTINATION ${CMAKE_CURRENT_BINARY_DIR}/junk
+  )
+
+  execute_process(
+    COMMAND ${CMAKE_COMMAND} -H${CMAKE_CURRENT_LIST_DIR}/test_project -B${TEST_BUILD_DIR} -DCPM_INCLUDE_ALL_IN_PACKAGE_LOCK=1
+    RESULT_VARIABLE ret
+  )
+
+  ASSERT_EQUAL(${ret} "0")
+endfunction()
+
+function(updatePackageLock)
+  execute_process(
+    COMMAND ${CMAKE_COMMAND} --build ${TEST_BUILD_DIR} --target cpm-update-package-lock
+    RESULT_VARIABLE ret
+  )
+
+  ASSERT_EQUAL(${ret} "0")
+endfunction()
+
+execute_process(COMMAND ${CMAKE_COMMAND} -E rm -f ${CMAKE_CURRENT_LIST_DIR}/test_project/package-lock.cmake)
+configureWithDeclare(YES)
+ASSERT_NOT_EXISTS(${CMAKE_CURRENT_LIST_DIR}/test_project/package-lock.cmake)
+updatePackageLock()
+ASSERT_EXISTS(${CMAKE_CURRENT_LIST_DIR}/test_project/package-lock.cmake)
+configureWithDeclare(NO)
+
--- a/test/unit/source_dir.cmake
+++ b/test/unit/source_dir.cmake
@@ -0,0 +1,21 @@
+
+include(CMakePackageConfigHelpers)
+include(${CPM_PATH}/testing.cmake)
+
+set(TEST_BUILD_DIR ${CMAKE_CURRENT_BINARY_DIR}/source_dir)
+
+set(TEST_DEPENDENCY_NAME Dependency)
+
+configure_package_config_file(
+  "${CMAKE_CURRENT_LIST_DIR}/test_project/ModuleCMakeLists.txt.in"
+  "${CMAKE_CURRENT_LIST_DIR}/test_project/CMakeLists.txt"
+  INSTALL_DESTINATION ${CMAKE_CURRENT_BINARY_DIR}/junk
+)
+
+execute_process(
+  COMMAND 
+  ${CMAKE_COMMAND} "-H${CMAKE_CURRENT_LIST_DIR}/test_project" "-B${TEST_BUILD_DIR}"
+  RESULT_VARIABLE ret
+)
+
+ASSERT_EQUAL(${ret} "0")
--- a/test/unit/test_project/.gitignore
+++ b/test/unit/test_project/.gitignore
@@ -0,0 +1,2 @@
+/CMakeLists.txt
+/package-lock.cmake
--- a/test/unit/test_project/ModuleCMakeLists.txt.in
+++ b/test/unit/test_project/ModuleCMakeLists.txt.in
@@ -0,0 +1,26 @@
+cmake_minimum_required(VERSION 3.14 FATAL_ERROR)
+
+project(CPMTest)
+
+# ---- Options ----
+
+option(ENABLE_TEST_COVERAGE "Enable test coverage" OFF)
+
+# ---- Dependencies ----
+
+include(@CPM_PATH@/CPM.cmake)
+
+CPMAddPackage(
+  NAME @TEST_DEPENDENCY_NAME@
+  SOURCE_DIR ${CMAKE_CURRENT_LIST_DIR}/dependency
+)
+
+# ---- check if generated modules override find_package ----
+
+if (@test_check_find_package@)
+  find_package(@TEST_DEPENDENCY_NAME@ REQUIRED)
+endif()
+
+# ---- Call dependency method to validate correct addition of directory ----
+
+dependency_function()
--- a/test/unit/test_project/PackageLockCMakeLists.txt.in
+++ b/test/unit/test_project/PackageLockCMakeLists.txt.in
@@ -0,0 +1,20 @@
+cmake_minimum_required(VERSION 3.14 FATAL_ERROR)
+
+project(CPMTest)
+
+# ---- Options ----
+
+option(ENABLE_TEST_COVERAGE "Enable test coverage" OFF)
+
+# ---- Dependencies ----
+
+include(@CPM_PATH@/CPM.cmake)
+CPMUsePackageLock(package-lock.cmake)
+
+@PREPARE_CODE@
+
+CPMGetPackage(Dependency)
+
+# ---- Call dependency method to validate correct addition of directory ----
+
+dependency_function()
--- a/test/unit/test_project/dependency/CMakeLists.txt
+++ b/test/unit/test_project/dependency/CMakeLists.txt
@@ -0,0 +1,4 @@
+
+function(dependency_function)
+  message("called external method")
+endfunction()
--- a/test/unit/version_from_git_tag.cmake
+++ b/test/unit/version_from_git_tag.cmake
@@ -0,0 +1,16 @@
+cmake_minimum_required(VERSION 3.14 FATAL_ERROR)
+
+include(${CPM_PATH}/CPM.cmake)
+include(${CPM_PATH}/testing.cmake)
+
+CPM_GET_VERSION_FROM_GIT_TAG("1.2.3" VERSION)
+ASSERT_EQUAL("1.2.3" ${VERSION})
+
+CPM_GET_VERSION_FROM_GIT_TAG("v1.2.3" VERSION)
+ASSERT_EQUAL("1.2.3" ${VERSION})
+
+CPM_GET_VERSION_FROM_GIT_TAG("1.2.3-a" VERSION)
+ASSERT_EQUAL("1.2.3" ${VERSION})
+
+CPM_GET_VERSION_FROM_GIT_TAG("v1.2.3-a" VERSION)
+ASSERT_EQUAL("1.2.3" ${VERSION})
Author	SHA1	Message	Date
Lars Melchior	829262cbd3	omit unversioned and local dependencies in package lock (#122 ) * omit unversioned and local dependencies in package lock * update package lock for active project only	2020-05-28 13:29:25 +02:00
Lars Melchior	4aeea1d31d	Add package lock (#121 ) * add package lock creation * change target name * fix cpm_export_variables * add test * fix git repo detection addition * remove test package lock from git * add link to package lock wiki * add CPMGetPackage	2020-05-27 19:07:06 +02:00
Lars Melchior	58365446f5	fix DOWNLOAD_ONLY option when used with CPMFindPackage (#120 )	2020-05-19 20:47:12 +02:00
Johel Ernesto Guerrero Peña	4937617ef1	Use STREQUAL rather than MATCHES <regex> (#116 )	2020-05-10 11:21:07 +02:00
Lars Melchior	6f053907f5	check if package added before find_package (#115 )	2020-05-07 23:54:10 +02:00
Ryan Mast	84b31b560a	Fix wiki link to preparing projects for CPM.cmake (#114 )	2020-04-30 09:45:12 +02:00
Lars Melchior	3fff3ca70d	Call FetchContent_GetProperties before DOWNLOAD_ONLY population (#113 ) * call FetchContent_GetProperties before checking populated * fix old CPM.cmake links * update description * bump version	2020-04-29 12:40:12 +02:00
Lars Melchior	ca33abc236	create FindXXX.cmake modules for added CPM packages (#112 ) * create FindXXX.cmake modules for added CPM packages * don't use list(PREPEND) as it unsupported on older CMake versions * use CMAKE_BINARY_DIR * ensure CPM.cmake is initialized only once * import CPM.cmake in modules	2020-04-29 09:18:54 +02:00
Giuseppe Cesarano	119eaee84d	Fixed link in README.md (#111 ) The section `Adding CPM` was poiting to non exinsting wiki page	2020-04-26 16:44:16 +02:00
Lars Melchior	00b5e80f88	Fix offline cache support (#110 ) * use cmake -E true as empty command * use cmake without arguments as valid empty command	2020-04-25 01:27:27 +02:00
Lars Melchior	618cdefa0d	Support CPM_SOURCE_CACHE on windows (#109 ) * use semicolon as empty command and add test * remove platform specific test coverage * only run actions for pushes and prs into master (avoid duplication) * remove cache test as it's already part of the test suite * update version * test cache reuse	2020-04-25 00:51:18 +02:00
Lars Melchior	464ba554c2	suppress package not found warning in CPMFindPackage (#103 )	2020-04-14 09:35:31 +02:00
Lars Melchior	90558aa9cb	Add GitHub action to publish CPM on release (#102 ) * add github action to publish cpm on release * add checkout step * update readme	2020-03-16 20:37:30 +01:00
Lars Melchior	95c5426d25	remove code artifact from previous PR (#101 )	2020-03-16 20:09:15 +01:00
Lars Melchior	cea81872cf	Add fmt example and document version from git tag (#100 ) * add VERSION_PREFIX argument * add fmt example * add VERSION_PREFIX note to readme * rollback, add info about determining version from git tag * rollback version	2020-03-16 20:00:30 +01:00
Lars Melchior	01b69aad82	add support for SOURCE_DIR argument (#97 ) * add support for SOURCE_DIR argument * simplify code * add test * update comment	2020-02-25 13:29:21 +01:00
Lars Melchior	775a235880	default to "ON" for options without explicit value definition (#96 ) * default to "ON" for options without explicit value definition * increment CPM version * compare the correct lengths	2020-02-06 11:50:55 +01:00
Lars Melchior	f8d4e959bb	abort when nested (bugfix) (#94 ) * abort when nested (bugfix) * update error message * update error message	2019-10-25 20:52:22 +02:00
Lars Melchior	4c7aa36dff	Update README.md	2019-10-25 16:01:47 +02:00
Lars Melchior	3a4516265c	Add GitHub workflows (#93 ) * add mac workflow * rename and add windows and ubuntu workflows * update tests * update tests * update travis	2019-10-24 18:14:58 +02:00
Lars Melchior	47bfb554ab	reorganise source and add CPMFindPackage (#92 ) * reorganise source and add CPMFindPackage * add consistent find_package behaviour * document CPMFindPackage * reset examples to CPMAddPackage unless tested * update version * update README.md * Update README.md	2019-10-24 15:42:25 +02:00
Lars Melchior	0a8a65df32	Update README.md (#90 )	2019-10-19 15:45:19 +02:00
Lars Melchior	a2800dc96c	Update for new repo name (old URLs are still valid) (#89 ) * Update for new repo name (old URL is still valid) * Update README.md	2019-10-18 11:53:36 +02:00
Lars Melchior	7638be873a	Add Ccache.cmake link (#88 )	2019-10-14 17:12:33 +02:00
Lars Melchior	d1a1b70d4a	update readme (#87 )	2019-10-14 12:55:47 +02:00
Lars Melchior	4064a45552	Add CPM_SOURCE_CACHE environmental variable support and keep existing sources (#83 ) * read CPM_SOURCE_CACHE from environment * update readme * cleanup * add cache tests	2019-10-10 20:13:10 +02:00
Paul T	b1855e9275	Feature/cereal example (#85 ) * Added GTest (googletest) Example The examples tests the Fibonacci library similar to the doctest example. * Add Example for the cereal library. * Update examples/cereal/CMakeLists.txt Co-Authored-By: Lars Melchior <TheLartians@users.noreply.github.com> * Remove Test Coverage Code * Remove Test Coverage Option	2019-10-09 15:30:59 +02:00
Paul T	5191b4c703	Added GTest (googletest) Example (#84 ) * Added GTest (googletest) Example The examples tests the Fibonacci library similar to the doctest example. * Update examples/gtest/CMakeLists.txt Co-Authored-By: Lars Melchior <TheLartians@users.noreply.github.com>	2019-10-09 14:50:27 +02:00
Lars Melchior	8625173d8f	add CPM_SOURCE_ROOT option (#81 ) * add CPM_SOURCE_ROOT option * update version and readme	2019-10-07 16:34:07 +02:00
Lars Melchior	504761fbf2	add EnTT example (#78 )	2019-09-06 11:52:18 +02:00
Lars Melchior	8b92bb46cd	Add more readme links to the wiki (#77 ) * Add readme link to snippets * Update README.md	2019-08-16 11:12:11 +02:00
Paul T	88278a4f70	Add Blurb on Including CPM (#76 ) * Add Blurb on Including CPM Added demo cmake code to auto download CPM from github. * Remove Section in favor of including a link to a wiki page.	2019-08-15 19:34:21 +02:00
Lars Melchior	72552708e6	add linenoise (#74 )	2019-07-31 13:25:58 +02:00
Lars Melchior	a6bc65a76c	add cxxopts example and update lua (#73 ) * add cxxopts example * use new tags for lua * update readme * update readme * update lua * typo	2019-07-24 11:48:50 +02:00
Lars Melchior	64f5fe37cd	Update README.md (#71 )	2019-07-01 20:44:51 +02:00
Lars Melchior	25a9158448	Add boost example (#70 ) * add unit tests * added boost * cleanup * add pthread * Update README.md	2019-07-01 20:30:21 +02:00
Lars Melchior	1e8d8d43c7	typos (#68 )	2019-06-29 19:23:38 +02:00
Lars Melchior	160a665973	remove unused argument (#67 )	2019-06-27 13:06:52 +02:00
Lars Melchior	3d75ed06a3	add unit tests and determine version from GIT_TAG (#66 ) * add unit tests * determine package version from git tag. closes #54. * update readme * bugfix * update example * update gitignore	2019-06-22 13:31:32 +02:00
Lars Melchior	1e25367c8c	add sol2 example (#65 ) * add sol2 example * Update README.md * Update README.md	2019-05-25 14:14:31 +02:00
Lars Melchior	9d2b5818c5	Update README.md (#64 ) * Update README.md * Update README.md * Update README.md * Update README.md * Update README.md * Update README.md * Update README.md	2019-05-24 16:34:05 +02:00
Lars Melchior	49e7903e19	Update README.md (#62 )	2019-05-23 14:35:45 +02:00
Lars Melchior	4d3997d408	update logo (#61 ) * update logo * update * update * update * update * update	2019-05-23 14:17:41 +02:00
Lars Melchior	d74bcebfe8	Update README.md (#60 )	2019-05-23 13:26:53 +02:00
Lars Melchior	db3111e07e	update logo (#59 ) * update logo * convert to png	2019-05-23 12:47:55 +02:00
Lars Melchior	840e2e2c40	Update README.md (#58 )	2019-05-23 12:25:10 +02:00
Lars Melchior	4952fd3d48	Update range v3 (#56 ) * update range-v3 example as the projects CMakeLists messes up the configuration * add comment * add range-v3 snipplet back	2019-05-23 12:25:00 +02:00
Lars Melchior	3659fa581c	Add logo (#57 ) * add logo * Update README.md * Update README.md	2019-05-23 12:08:46 +02:00
Lars Melchior	4aeb1215bf	Update README.md	2019-05-22 18:33:41 +02:00
Lars Melchior	13559c7137	Add range-v3 example (#55 ) * add range-v3 example * update Readme * Update README.md * Update README.md * Update README.md	2019-05-22 14:21:54 +02:00
Lars Melchior	e4f1ade459	Update README.md	2019-05-22 10:46:48 +02:00
Lars Melchior	7723e56dab	Update README.md	2019-05-22 01:32:41 +02:00
Lars Melchior	8287799e79	Update README.md	2019-05-22 01:18:07 +02:00
Lars Melchior	cd91713d10	Update README.md	2019-05-22 00:16:11 +02:00
Lars Melchior	4967b841ad	Update CPM.cmake	2019-05-20 17:54:08 +02:00
Lars Melchior	9c2c34f487	Update CPM.cmake	2019-05-20 17:53:37 +02:00
Lars Melchior	bd9143bfa0	Update README.md	2019-05-20 14:52:46 +02:00
Lars Melchior	a4f055c7aa	Add url shortcuts (#53 ) * add github and gitlab shortcut, closes #52 * update version * update examples and readme	2019-05-20 13:33:01 +02:00
Lars Melchior	002cf6b64c	print version warning in main CPM	2019-05-20 13:03:45 +02:00
Lars Melchior	f13c343859	Update README.md	2019-05-20 11:34:35 +02:00
Lars Melchior	bf5e9ebafb	Add DEPENDENCY_ADDED property (#50 ) * add DEPENDENCY_ADDED property * update examples * Update README.md * Update README.md * Update CPM.cmake * Update README.md	2019-05-20 01:52:55 +02:00
Lars Melchior	275a12f2d8	Update README.md	2019-05-19 21:48:31 +02:00
Lars Melchior	6878cf622b	Update README.md	2019-05-19 21:48:11 +02:00
Lars Melchior	4f57bd4b5b	Update README.md	2019-05-19 20:41:19 +02:00
Lars Melchior	bf1996b9f4	Update README.md	2019-05-19 20:39:40 +02:00
Lars Melchior	f72944e897	Update README.md	2019-05-19 20:15:30 +02:00
Lars Melchior	79cbebb4f9	Update README.md	2019-05-19 20:14:23 +02:00
Lars Melchior	d3b23be4e2	Update README.md	2019-05-19 20:04:44 +02:00
Lars Melchior	5352247b4d	Update README.md	2019-05-19 19:38:32 +02:00
Lars Melchior	798e4e35bf	Update README.md	2019-05-19 19:30:55 +02:00
Lars Melchior	7d6297c5c6	Update CMakeLists.txt	2019-05-19 19:04:27 +02:00
Lars Melchior	e0bfe05874	update examples	2019-05-19 19:03:56 +02:00
Lars Melchior	530fc8d42f	Update README.md	2019-05-19 19:02:33 +02:00
Lars Melchior	a086f637fb	Update README.md	2019-05-19 15:08:34 +02:00
Lars Melchior	5203eb6e30	Update README.md	2019-05-17 18:44:42 +02:00
Lars Melchior	7a8599cf34	Update README.md	2019-05-17 18:43:52 +02:00
Lars Melchior	bd3732706a	Update README.md	2019-05-17 18:42:24 +02:00
Lars Melchior	84d6e53c65	Update README.md	2019-05-17 18:42:05 +02:00
Lars Melchior	7bbc667df1	add imported flag (#48 )	2019-05-17 18:21:36 +02:00
Lars Melchior	f5050169b0	Update README.md	2019-05-17 18:15:08 +02:00
Lars Melchior	a7ab78f3bf	Update README.md	2019-05-17 18:13:37 +02:00
Lars Melchior	b1ef60175a	New examples (#47 ) * simplify yaml build * add simple_match	2019-05-17 18:07:31 +02:00
Lars Melchior	8253393c75	add yaml example	2019-05-17 17:32:52 +02:00
Lars Melchior	f9ba3f2457	Update README.md	2019-05-17 15:58:02 +02:00
Lars Melchior	77e74910bc	Update README.md	2019-05-17 15:14:47 +02:00
Lars Melchior	55caef9286	Update README.md	2019-05-17 15:13:54 +02:00
Lars Melchior	f57476ee43	Update README.md	2019-05-17 14:50:27 +02:00
Lars Melchior	db4f2bf7bb	Update README.md	2019-05-17 14:47:35 +02:00
Lars Melchior	8d39e34ff2	v0.9 (#46 ) * always get properties * update examples * update travis * add doctest example * update example runner	2019-05-17 14:46:54 +02:00
Lars Melchior	c2a413300e	Update README.md	2019-05-11 15:44:22 +02:00
Lars Melchior	5177860756	Update README.md	2019-05-11 15:12:06 +02:00
Lars Melchior	5dad9d4e9d	update examples (#45 )	2019-05-10 16:20:53 +02:00
Lars Melchior	539974785e	Update README.md	2019-05-10 16:03:46 +02:00
Lars Melchior	e4a0cb4980	Update README.md	2019-05-10 13:10:48 +02:00
Lars Melchior	a8ccc42f43	Update README.md	2019-05-10 12:03:09 +02:00
Lars Melchior	f92ed18514	Update README.md	2019-05-10 09:56:57 +02:00
Lars Melchior	153c196c18	Update README.md	2019-05-10 09:56:34 +02:00
Lars Melchior	d91befd7ce	Update README.md	2019-05-10 09:55:48 +02:00
Lars Melchior	978c101c7e	Update README.md	2019-05-09 13:50:10 +02:00
Lars Melchior	8da680df9b	Update README.md	2019-05-09 13:45:44 +02:00
Lars Melchior	6943b38afb	Update README.md	2019-05-09 13:36:23 +02:00
Lars Melchior	cf042cf1ac	Update README.md	2019-05-09 13:31:18 +02:00
Lars Melchior	bebea37c4a	Update CPM.cmake	2019-05-09 13:29:12 +02:00
Lars Melchior	137bda299d	Update CPM.cmake (#44 ) * Update CPM.cmake * Update CPM.cmake	2019-05-08 21:36:51 +02:00
Lars Melchior	4d557d128f	Update README.md	2019-05-06 10:21:58 +02:00
Lars Melchior	9021499c52	Update CPM.cmake	2019-05-05 11:47:28 +02:00
Lars Melchior	9b97b64da2	Correct version output	2019-05-04 10:39:39 +02:00
Lars Melchior	df752ed5d3	Update CPM.cmake	2019-05-04 10:32:20 +02:00