Default config

README.md

@@ -45,6 +45,7 @@ makey-midi --debug connect "Microsoft GS Wavetable Synth"
 ## Config
 
 Below is an example `config.toml` file.
+If no config file is found when running, makey-midi will fall back to the default config shown below.
 The `channel` defined what channel the midi events are sent on.
 The `keymap` is the main part where you map keyboard keys to midi notes.
 A list of all possible key values is in the dropdown below, and a table of midi notes can be found [here](https://www.inspiredacoustics.com/en/MIDI_note_numbers_and_center_frequencies).

src/main.rs

@@ -10,6 +10,8 @@ use crate::{args::Args, config::Config};
 mod args;
 mod config;
 
+const DEFAULT_CONFIG: &str = include_str!("../config.toml");
+
 struct MakeyMidi {
     debug: bool,
     config: Config,
@@ -19,25 +21,24 @@ struct MakeyMidi {
 
 fn main() -> Result<()> {
     let args = Args::parse();
-
-    let raw_config =
-        fs::read_to_string(args.config.unwrap_or_else(|| PathBuf::from("config.toml")))?;
-    let config = toml::from_str::<Config>(&raw_config)?;
+    let config = load_config(args.config.unwrap_or_else(|| PathBuf::from("config.toml")))?;
+    let output = args.midi.midi_device()?;
 
     let mut app = MakeyMidi {
         debug: args.debug,
         config,
-        output: args.midi.midi_device()?,
+        output,
         pressed: HashSet::new(),
     };
-    if let Err(error) = listen(move |x| callback(&mut app, x)) {
+
+    if let Err(error) = listen(move |x| key_handler(&mut app, x)) {
         println!("[E] Rdev error: {:?}", error)
     }
 
     Ok(())
 }
 
-fn callback(app: &mut MakeyMidi, event: Event) {
+fn key_handler(app: &mut MakeyMidi, event: Event) {
     let event = match event.event_type {
         EventType::KeyPress(e) => {
             if !app.pressed.insert(e) {
@@ -77,3 +78,18 @@ fn callback(app: &mut MakeyMidi, event: Event) {
         let _ = app.output.send(&buf);
     }
 }
+
+fn load_config(path: PathBuf) -> Result<Config> {
+    let raw_config = match fs::read_to_string(path) {
+        Ok(x) => x,
+        Err(error) => {
+            println!("[E] Failed to read config file: {:?}", error);
+            println!("[I] Using default config and writing to disk");
+            if let Err(e) = fs::write("config.toml", DEFAULT_CONFIG) {
+                println!("[E] Failed to write default config: {:?}", e);
+            }
+            DEFAULT_CONFIG.to_owned()
+        }
+    };
+    Ok(toml::from_str(&raw_config)?)
+}