adding default config dirs

components/util/basedir.rs

@@ -0,0 +1,57 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+//! Contains routines for retrieving default config directories.
+//! For linux based platforms, it uses the XDG base directory spec but provides
+//! similar abstractions for non-linux platforms.
+
+extern crate xdg;
+
+use std::env;
+use std::fs;
+use std::path::PathBuf;
+
+#[cfg(all(unix, not(target_os = "macos"), not(target_os = "ios"), not(target_os = "windows")))]
+pub fn default_config_dir() -> Option<PathBuf> {
+    let xdg_dirs = xdg::BaseDirectories::with_profile("servo", "default").unwrap();
+    let config_dir = xdg_dirs.get_config_home();
+    Some(config_dir)
+}
+
+#[cfg(all(unix, not(target_os = "macos"), not(target_os = "ios"), not(target_os = "windows")))]
+pub fn default_data_dir() -> Option<PathBuf> {
+    let xdg_dirs = xdg::BaseDirectories::with_profile("servo", "default").unwrap();
+    let data_dir = xdg_dirs.get_data_home();
+    Some(data_dir)
+}
+
+#[cfg(all(unix, not(target_os = "macos"), not(target_os = "ios"), not(target_os = "windows")))]
+pub fn default_cache_dir() -> Option<PathBuf> {
+    let xdg_dirs = xdg::BaseDirectories::with_profile("servo", "default").unwrap();
+    let cache_dir = xdg_dirs.get_cache_home();
+    Some(cache_dir)
+}
+
+#[cfg(target_os = "macos")]
+pub fn default_config_dir() -> Option<PathBuf> {
+    let mut config_dir = env::home_dir().unwrap();
+    config_dir.push("Library");
+    config_dir.push("Application Support");
+    config_dir.push("Servo");
+    Some(config_dir)
+}
+
+#[cfg(target_os = "windows")]
+pub fn default_config_dir() -> Option<PathBuf> {
+    let mut config_dir = match env::var("APPDATA") {
+        Ok(appdata_path) => PathBuf::from(appdata_path),
+        Err(_) => { let mut dir = env::home_dir().unwrap();
+            dir.push("Appdata");
+            dir.push("Roaming");
+            dir
+        }
+    };
+    config_dir.push("Servo");
+    Some(config_dir)
+}