Add commandline flag for custom config filename

Related to #565

src/config.rs

@@ -98,13 +98,14 @@ lazy_static! {
 }
 
 pub struct Config {
+    filename: String,
     values: RwLock<ConfigValues>,
     state: RwLock<UserState>,
 }
 
 impl Config {
-    pub fn new() -> Self {
+    pub fn new(filename: &str) -> Self {
-        let values = load().unwrap_or_else(|e| {
+        let values = load(filename).unwrap_or_else(|e| {
             eprintln!("could not load config: {}", e);
             process::exit(1);
         });
@@ -124,6 +125,7 @@ impl Config {
         }
 
         Self {
+            filename: filename.to_string(),
             values: RwLock::new(values),
             state: RwLock::new(userstate),
         }
@@ -159,13 +161,13 @@ impl Config {
     }
 
     pub fn reload(&self) {
-        let cfg = load().expect("could not reload config");
+        let cfg = load(&self.filename).expect("could not reload config");
         *self.values.write().expect("can't writelock config values") = cfg
     }
 }
 
-fn load() -> Result<ConfigValues, String> {
+fn load(filename: &str) -> Result<ConfigValues, String> {
-    let path = config_path("config.toml");
+    let path = config_path(filename);
     TOML.load_or_generate_default(path, || Ok(ConfigValues::default()), false)
 }
 

src/main.rs

@@ -122,6 +122,15 @@ async fn main() {
                 .help("custom basepath to config/cache files")
                 .takes_value(true),
         )
+        .arg(
+            Arg::with_name("config")
+                .short("c")
+                .long("config")
+                .value_name("FILE")
+                .help("Filename of config file in basepath")
+                .takes_value(true)
+                .default_value("config.toml"),
+        )
         .get_matches();
 
     if let Some(filename) = matches.value_of("debug") {
@@ -138,7 +147,9 @@ async fn main() {
 
     // Things here may cause the process to abort; we must do them before creating curses windows
     // otherwise the error message will not be seen by a user
-    let cfg: Arc<crate::config::Config> = Arc::new(Config::new());
+    let cfg: Arc<crate::config::Config> = Arc::new(Config::new(
+        matches.value_of("config").unwrap_or("config.toml"),
+    ));
 
     let cache = Cache::new(
         Some(config::cache_path("librespot")),