plugin_framework, mid commit

Signed-off-by: fufesou <shuanglongchen@yeah.net>

src/plugin/mod.rs

@@ -100,10 +100,27 @@ pub fn init() {
     }
 }
 
+#[inline]
+#[cfg(target_os = "windows")]
+fn get_share_dir() -> ResultType<PathBuf> {
+    Ok(PathBuf::from(env::var("ProgramData")?))
+}
+
+#[inline]
+#[cfg(target_os = "linux")]
+fn get_share_dir() -> ResultType<PathBuf> {
+    Ok(PathBuf::from("/usr/share"))
+}
+
+#[inline]
+#[cfg(target_os = "macos")]
+fn get_share_dir() -> ResultType<PathBuf> {
+    Ok(PathBuf::from("/Library/Application Support"))
+}
+
 #[inline]
 fn get_plugins_dir() -> ResultType<PathBuf> {
-    // to-do: linux and macos
-    Ok(PathBuf::from(env::var("ProgramData")?)
+    Ok(get_share_dir()?
         .join("RustDesk")
         .join(PLUGIN_SOURCE_LOCAL_DIR))
 }