reorganize server crate by moving workspace related code to submodule (#182)

crates/djls-server/src/workspace/utils.rs

@@ -0,0 +1,43 @@
+use std::path::PathBuf;
+
+use percent_encoding::percent_decode_str;
+use tower_lsp_server::lsp_types::InitializeParams;
+use tower_lsp_server::lsp_types::Uri;
+
+/// Determines the project root path from initialization parameters.
+///
+/// Tries the current directory first, then falls back to the first workspace folder.
+pub fn get_project_path(params: &InitializeParams) -> Option<PathBuf> {
+    // Try current directory first
+    std::env::current_dir().ok().or_else(|| {
+        // Fall back to the first workspace folder URI
+        params
+            .workspace_folders
+            .as_ref()
+            .and_then(|folders| folders.first())
+            .and_then(|folder| uri_to_pathbuf(&folder.uri))
+    })
+}
+
+/// Converts a `file:` URI into an absolute `PathBuf`.
+fn uri_to_pathbuf(uri: &Uri) -> Option<PathBuf> {
+    // Check if the scheme is "file"
+    if uri.scheme().is_none_or(|s| s.as_str() != "file") {
+        return None;
+    }
+
+    // Get the path part as a string
+    let encoded_path_str = uri.path().as_str();
+
+    // Decode the percent-encoded path string
+    let decoded_path_cow = percent_decode_str(encoded_path_str).decode_utf8_lossy();
+    let path_str = decoded_path_cow.as_ref();
+
+    #[cfg(windows)]
+    let path_str = {
+        // Remove leading '/' for paths like /C:/...
+        path_str.strip_prefix('/').unwrap_or(path_str)
+    };
+
+    Some(PathBuf::from(path_str))
+}