Add a -c/--config option to use a config file different from the default

src/config.rs

@@ -1,4 +1,5 @@
 use std::fs;
+use std::path::PathBuf;
 
 use serde::Deserialize;
 
@@ -14,17 +15,23 @@ struct CompleteConfig {
     seasonal_clock: Config,
 }
 
-pub fn get_config() -> Option<Config> {
-    let xdg_dirs = xdg::BaseDirectories::new().unwrap();
-    let config_path = xdg_dirs
-        .place_config_file("seasonal-clock.toml")
-        .expect("cannot create configuration directory");
+pub fn get_config(filename: Option<String>) -> Option<Config> {
+    let config_path = match filename {
+        Some(v) => PathBuf::from(v),
+        None => {
+            let xdg_dirs = xdg::BaseDirectories::new().unwrap();
+            xdg_dirs
+                .place_config_file("seasonal-clock.toml")
+                .expect("cannot create configuration directory")
+        }
+    };
     let data: std::io::Result<String> = fs::read_to_string(config_path);
 
     if let Ok(..) = data {
         let complete_config: CompleteConfig = toml::from_str(&data.unwrap()).unwrap();
         Some(complete_config.seasonal_clock)
     } else {
+        eprintln!("Could not parse config file {:?}", data);
         None
     }
 }

src/main.rs

@@ -21,6 +21,10 @@ struct Args {
     /// Print the current hour’s name and exit
     #[clap(short, long)]
     now: bool,
+
+    /// Use FILE as the configuration file
+    #[clap(short, long, value_name = "FILE")]
+    config: Option<String>,
 }
 
 sctk::default_environment!(SeasonalClock, desktop);
@@ -32,7 +36,8 @@ fn main() {
         println!("{}", get_current_hour_name());
         std::process::exit(0);
     }
-    let config = get_config();
+
+    let config = get_config(args.config);
 
     run_windowed(&config);
 }