move from xdg crate to cross-platform directories crate

closes #38

src/config.rs

@@ -1,4 +1,8 @@
 use std::collections::HashMap;
+use std::fs;
+use std::path::PathBuf;
+
+use directories::ProjectDirs;
 
 pub const CLIENT_ID: &str = "d420a117a32841c2b3474932e49fb54b";
 
@@ -8,3 +12,25 @@ pub struct Config {
     pub password: String,
     pub keybindings: Option<HashMap<String, String>>,
 }
+
+pub fn config_path() -> PathBuf {
+    let dirs = directories::BaseDirs::new().expect("can't determine config path");
+    PathBuf::from(format!(
+        "{0}/ncspot",
+        dirs.config_dir()
+            .to_str()
+            .expect("can't convert path to string")
+    ))
+}
+
+pub fn cache_path() -> PathBuf {
+    let proj_dirs =
+        ProjectDirs::from("org", "affekt", "ncspot").expect("can't determine project paths");
+    let cache_dir = proj_dirs.cache_dir();
+    if !cache_dir.exists() {
+        fs::create_dir(cache_dir).expect("can't create cache folder");
+    }
+    let mut pb = proj_dirs.cache_dir().to_path_buf();
+    pb.push("playlists.db");
+    pb
+}