added link_install_to_target

src/linker.rs

@@ -8,40 +8,25 @@ use crate::fomod::FileTypeEnum;
 
 pub struct Linker {
     target: PathBuf,
+    game_dir: PathBuf,
 }
 
 impl Linker {
-    pub fn new(target_path: &Path) -> Self {
+    pub fn new(target_path: &Path, game_dir: &Path) -> Self {
         Self {
             target: target_path.to_owned(),
+            game_dir: game_dir.to_owned(),
         }
     }
 
-    #[inline]
-    fn install_path(&self) -> &Path {
-        &self.target
-    }
-
     fn link_file(&self, from: &Path, to: &Path) -> Result<(), LinkerError> {
-        let target = self.install_path().join(path_to_lowercase(to));
+        let target = self.target.join(path_to_lowercase(to));
 
         if let Some(parent) = target.parent() {
             fs::create_dir_all(parent)?;
         }
 
-        unix::fs::symlink(from, target)?;
+        create_symlink_for_file(from, &target)?;
-        Ok(())
-    }
-
-    fn remove_link(&self, to: &Path) -> Result<(), LinkerError> {
-        let file = self.install_path().join(path_to_lowercase(to));
-        let metadata = fs::symlink_metadata(&file)?;
-
-        if !metadata.file_type().is_symlink() {
-            return Err(LinkerError::NotASymlink(file));
-        }
-
-        fs::remove_file(&file)?;
         Ok(())
     }
 
@@ -64,30 +49,6 @@ impl Linker {
         Ok(())
     }
 
-    fn unlink_recursive(&self, from: &Path, to: &Path) -> Result<(), LinkerError> {
-        for entry in fs::read_dir(from)? {
-            let entry = entry?;
-            let entry_path = entry.path();
-            let relative = entry_path
-                .strip_prefix(from)
-                .map_err(|e| io::Error::new(io::ErrorKind::InvalidInput, e))?;
-            let target_path = to.join(relative);
-
-            if entry_path.is_dir() {
-                self.unlink_recursive(&entry_path, &target_path)?;
-
-                let install_target = self.install_path().join(&target_path);
-                if install_target.exists() && fs::read_dir(&install_target)?.next().is_none() {
-                    fs::remove_dir(&install_target)?;
-                }
-            } else {
-                self.remove_link(&target_path)?;
-            }
-        }
-
-        Ok(())
-    }
-
     pub fn link_plugin_files(
         &self,
         entries: &[FileTypeEnum],
@@ -116,19 +77,44 @@ impl Linker {
 
         Ok(())
     }
+
+    pub fn link_install_to_target(&self) -> Result<(), LinkerError> {
+        fn symlink_tree(src: &Path, dst: &Path) -> Result<(), LinkerError> {
+            if !dst.exists() {
+                fs::create_dir_all(dst)?;
+            }
+
+            for entry in fs::read_dir(src)? {
+                let entry = entry?;
+                let src_path = entry.path();
+                let dst_path = dst.join(path_to_lowercase(&entry.path()).file_name().unwrap());
+
+                let meta = entry.metadata()?;
+                if meta.is_dir() {
+                    symlink_tree(&src_path, &dst_path)?;
+                } else if meta.is_file() {
+                    create_symlink_for_file(&src_path, &dst_path)?;
+                }
+            }
+
+            Ok(())
+        }
+
+        symlink_tree(&self.game_dir, &self.target)?;
+
+        Ok(())
+    }
 }
 
 #[derive(Debug)]
 pub enum LinkerError {
     Io(io::Error),
-    NotASymlink(PathBuf),
 }
 
 impl std::fmt::Display for LinkerError {
     fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
         match self {
             Self::Io(e) => write!(f, "IO error: {}", e),
-            Self::NotASymlink(path) => write!(f, "Tried to remove a non symlink: {:?}", path),
         }
     }
 }
@@ -144,3 +130,15 @@ impl From<io::Error> for LinkerError {
 fn path_to_lowercase(path: &Path) -> PathBuf {
     PathBuf::from(path.to_string_lossy().to_lowercase())
 }
+
+fn create_symlink_for_file(src: &Path, dst: &Path) -> io::Result<()> {
+    #[cfg(unix)]
+    {
+        unix::fs::symlink(src, dst)
+    }
+
+    #[cfg(windows)]
+    {
+        std::os::windows::fs::symlink_file(src, dst)
+    }
+}