fix: GIT_TAG not parsed inside CPMFindPackage (#159)

When using CPMFindPackage, if no VERSION is given then GIT_TAG is used as fallback if defined, which is a good idea.
The issue is that GIT_TAG is missing inside the oneValueArgs variable therefore GIT_TAG is not parsed. This is resolved by this little change.

README.md

@@ -1,7 +1,7 @@
 [![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)
+[![Actions Status](https://github.com/TheLartians/CPM.cmake/workflows/Ubuntu/badge.svg)](https://github.com/TheLartians/CPM.cmake/actions) [![Join the chat at https://gitter.im/TheLartians/CPM.cmake](https://badges.gitter.im/TheLartians/CPM.cmake.svg)](https://gitter.im/TheLartians/CPM.cmake?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
 
 <p align="center">
   <img src="./logo/CPM.png" height="100" />
@@ -79,14 +79,15 @@ See the [examples directory](https://github.com/TheLartians/CPM.cmake/tree/maste
 
 ## 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.
+To add CPM to your current project, simply add the [latest release](https://github.com/TheLartians/CPM.cmake/releases/latest) of `CPM.cmake` or `get_cpm.cmake` to your project's `cmake` directory.
+The command below will perform this automatically.
 
 ```bash
 mkdir -p cmake
-wget -O cmake/CPM.cmake https://github.com/TheLartians/CPM.cmake/releases/latest/download/CPM.cmake
+wget -O cmake/CPM.cmake https://github.com/TheLartians/CPM.cmake/releases/latest/download/get_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.
+You can also download CPM.cmake directly from your project's `CMakeLists.txt`. See the [wiki](https://github.com/TheLartians/CPM.cmake/wiki/Downloading-CPM.cmake-in-CMake) for more details.
 
 ## Updating CPM
 
@@ -154,6 +155,8 @@ 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.
 
+You can use `CPM_SOURCE_CACHE` on GitHub Actions workflows [cache](https://github.com/actions/cache) and combine it with ccache, to make your CI faster. See the [wiki](https://github.com/TheLartians/CPM.cmake/wiki/Caching-with-CPM.cmake-and-ccache-on-GitHub-Actions) for more info.
+
 ### CPM_DOWNLOAD_ALL
 
 If set, CPM will forward all calls to `CPMFindPackage` as `CPMAddPackage`.
@@ -195,7 +198,6 @@ cmake --build build --target cpm-update-package-lock
 
 See the [wiki](https://github.com/TheLartians/CPM.cmake/wiki/Package-lock) for more info.
 
-
 ## Built with CPM.cmake
 
 Some amazing projects that are built using the CPM.cmake package manager. 
@@ -350,6 +352,7 @@ if (lua_ADDED)
   # lua has no CMake support, so we create our own target
 
   FILE(GLOB lua_sources ${lua_SOURCE_DIR}/*.c)
+  list(REMOVE_ITEM lua_sources "${lua_SOURCE_DIR}/lua.c" "${lua_SOURCE_DIR}/luac.c")
   add_library(lua STATIC ${lua_sources})
 
   target_include_directories(lua

cmake/CPM.cmake

@@ -119,6 +119,7 @@ function(CPMFindPackage)
   set(oneValueArgs
     NAME
     VERSION
+    GIT_TAG
     FIND_PACKAGE_ARGUMENTS
   )
 
@@ -252,6 +253,7 @@ function(CPMAddPackage)
       NAME ${CPM_ARGS_NAME}
       SOURCE_DIR ${PACKAGE_SOURCE}
       FORCE True
+      OPTIONS ${CPM_ARGS_OPTIONS}
     )
     cpm_export_variables(${CPM_ARGS_NAME})
     return()

examples/sol2/CMakeLists.txt

@@ -17,6 +17,7 @@ if (lua_ADDED)
   # lua has no CMakeLists, so we create our own target
 
   FILE(GLOB lua_sources ${lua_SOURCE_DIR}/*.c)
+  list(REMOVE_ITEM lua_sources "${lua_SOURCE_DIR}/lua.c" "${lua_SOURCE_DIR}/luac.c")
   add_library(lua STATIC ${lua_sources})
 
   target_include_directories(lua

examples/spdlog/CMakeLists.txt

@@ -0,0 +1,19 @@
+cmake_minimum_required(VERSION 3.14 FATAL_ERROR)
+
+project(CPMSpdlogExample)
+
+# ---- Dependencies ----
+
+include(../../cmake/CPM.cmake)
+
+CPMAddPackage(
+        NAME spdlog
+        GITHUB_REPOSITORY gabime/spdlog
+        VERSION 1.7.0
+)
+
+# ---- Executable ----
+
+add_executable(CPMSpdlogExample "main.cpp")
+set_target_properties(CPMSpdlogExample PROPERTIES CXX_STANDARD 17)
+target_link_libraries(CPMSpdlogExample spdlog)

examples/spdlog/main.cpp

@@ -0,0 +1,6 @@
+#include <spdlog/spdlog.h>
+
+int main() {
+  spdlog::info("Hello, world!");
+  return 0;
+}