feat add Path

CMakeLists.txt

@@ -20,7 +20,9 @@ add_subdirectory(3party/fmt EXCLUDE_FROM_ALL)
 target_include_directories(sled PUBLIC 3party/eigen)
 target_sources(
   sled
-  PRIVATE src/log/log.cc
+  PRIVATE 
+          src/filesystem/path.cc
+          src/log/log.cc
           src/network/async_resolver.cc
           src/network/ip_address.cc
           src/network/null_socket_server.cc

include/sled/filesystem/path.h

@@ -0,0 +1,24 @@
+#pragma once
+#ifndef SLED_FILESYSTEM_PATH_H
+#define SLED_FILESYSTEM_PATH_H
+
+#include <string>
+
+namespace sled {
+class Path {
+public:
+    // cwd = current working directory
+    static Path Current();
+    static Path Home();
+    static Path TempDir();
+
+    Path();
+    Path(const std::string &path);
+
+    std::string ToString() const { return path_; };
+
+private:
+    std::string path_;
+};
+}// namespace sled
+#endif// SLED_FILESYSTEM_PATH_H

include/sled/filesystem/temporary_file.h

@@ -0,0 +1,13 @@
+#pragma once
+#ifndef SLED_FILESYSTEM_TEMPORARY_FILE_H
+#define SLED_FILESYSTEM_TEMPORARY_FILE_H
+
+#include <string>
+
+namespace sled {
+class TemporaryFile {
+    TemporaryFile();
+    TemporaryFile(const std::string &tmp_dir);
+};
+}// namespace sled
+#endif// SLED_FILESYSTEM_TEMPORARY_FILE_H

src/filesystem/path.cc

@@ -0,0 +1,46 @@
+#include "sled/filesystem/path.h"
+#include "sled/log/log.h"
+#include <errno.h>
+#include <unistd.h>
+
+namespace sled {
+Path
+Path::Current()
+{
+    char tmp_path[PATH_MAX];
+    if (getcwd(tmp_path, PATH_MAX)) {
+        auto cwd = Path(tmp_path);
+        return cwd;
+    }
+
+    LOGE("Path", "getcwd failed: {}", strerror(errno));
+
+    return Path();
+}
+
+Path
+Path::Home()
+{
+    char *home = getenv("HOME");
+    if (home) {
+        return Path(home);
+    } else {
+        return Path();
+    }
+}
+
+Path
+Path::TempDir()
+{
+    char *tmp = getenv("TMPDIR");
+    if (tmp) {
+        return Path(tmp);
+    } else {
+        return Path("/tmp/");
+    }
+}
+
+Path::Path() {}
+
+Path::Path(const std::string &path) : path_(path) {}
+}// namespace sled