swayrbar: Add -c/--config-file command line option

Cargo.lock

@@ -78,9 +78,9 @@ dependencies = [
 
 [[package]]
 name = "clap"
-version = "3.1.17"
+version = "3.1.18"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "47582c09be7c8b32c0ab3a6181825ababb713fde6fff20fc573a3870dd45c6a0"
+checksum = "d2dbdf4bdacb33466e854ce889eee8dfd5729abf7ccd7664d0a2d60cd384440b"
 dependencies = [
  "atty",
  "bitflags",
@@ -95,9 +95,9 @@ dependencies = [
 
 [[package]]
 name = "clap_derive"
-version = "3.1.7"
+version = "3.1.18"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a3aab4734e083b809aaf5794e14e756d1c798d2c69c7f7de7a09a2f5214993c1"
+checksum = "25320346e922cffe59c0bbc5410c8d8784509efb321488971081313cb1e1a33c"
 dependencies = [
  "heck",
  "proc-macro-error",
@@ -641,6 +641,7 @@ version = "0.2.1"
 dependencies = [
  "battery",
  "chrono",
+ "clap",
  "directories",
  "env_logger",
  "log",
@@ -657,9 +658,9 @@ dependencies = [
 
 [[package]]
 name = "syn"
-version = "1.0.92"
+version = "1.0.93"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7ff7c592601f11445996a06f8ad0c27f094a58857c2f89e97974ab9235b92c52"
+checksum = "04066589568b72ec65f42d65a1a52436e954b168773148893c020269563decf2"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -668,9 +669,9 @@ dependencies = [
 
 [[package]]
 name = "sysinfo"
-version = "0.23.11"
+version = "0.23.12"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3bf915673a340ee41f2fc24ad1286c75ea92026f04b65a0d0e5132d80b95fc61"
+checksum = "56b1e20ee77901236c389ff74618a899ff5fd34719a7ff0fd1d64f0acca5179a"
 dependencies = [
  "cfg-if",
  "core-foundation-sys 0.8.3",

swayr/src/shared/cfg.rs

@@ -74,7 +74,7 @@ where
                     + "I've created a fresh config for use with wofi for you in "
                     + &path.to_string_lossy()
                         + ". Adapt it to your needs."
-                }else{
+                } else {
                     "Welcome to swayrbar! ".to_owned()
                     + "I've created a fresh config for for you in "
                     + &path.to_string_lossy()
@@ -88,14 +88,28 @@ where
             .spawn()
             .ok();
         log::debug!("Created new config in {}.", path.to_string_lossy());
+    }
+
+    load_config_file(&path)
+}
+
+pub fn load_config_file<T>(config_file: &Path) -> T
+where
+    T: Serialize + DeserializeOwned + Default,
+{
+    if !config_file.exists() {
+        panic!(
+            "Config file {} does not exist.",
+            config_file.to_string_lossy()
+        );
     } else {
-        log::debug!("Loaded config from {}.", path.to_string_lossy());
+        log::debug!("Loading config from {}.", config_file.to_string_lossy());
     }
     let mut file = OpenOptions::new()
         .read(true)
         .write(false)
         .create(false)
-        .open(path)
+        .open(config_file)
         .unwrap();
     let mut buf: String = String::new();
     file.read_to_string(&mut buf).unwrap();

swayrbar/Cargo.toml

@@ -9,6 +9,7 @@ authors = ["Tassilo Horn <tsdh@gnu.org>"]
 license = "GPL-3.0+"
 
 [dependencies]
+clap = {version = "3.0.0", features = ["derive"] }
 battery = "0.7.8"
 chrono = "0.4"
 directories = "4.0"

swayrbar/src/bar.rs

@@ -21,6 +21,7 @@ use crate::module::{BarModuleFn, NameInstanceAndReason, RefreshReason};
 use env_logger::Env;
 use serde_json;
 use std::io;
+use std::path::Path;
 use std::process as p;
 use std::sync::mpsc::sync_channel;
 use std::sync::mpsc::Receiver;
@@ -30,11 +31,30 @@ use std::{sync::Arc, thread};
 use swaybar_types as sbt;
 use swayipc as si;
 
-pub fn start() {
+#[derive(clap::Parser)]
+#[clap(about, version, author)]
+pub struct Opts {
+    #[clap(
+        short = 'c',
+        long,
+        help = "Path to a config.toml configuration file.
+If not specified, the default config ~/.config/swayrbar/config.toml or
+/etc/xdg/swayrbar/config.toml is used."
+    )]
+    config_file: Option<String>,
+}
+
+pub fn start(opts: Opts) {
     env_logger::Builder::from_env(Env::default().default_filter_or("warn"))
         .init();
 
-    let config = config::load_config();
+    let config = match opts.config_file {
+        None => config::load_config(),
+        Some(config_file) => {
+            let path = Path::new(&config_file);
+            crate::shared::cfg::load_config_file(path)
+        }
+    };
     let refresh_interval = config.refresh_interval;
     let mods: Arc<Vec<Box<dyn BarModuleFn>>> = Arc::new(create_modules(config));
     let mods_for_input = mods.clone();

swayrbar/src/bin/swayrbar.rs

@@ -15,8 +15,10 @@
 
 //! The `swayrbar` binary.
 
+use clap::Parser;
+use swayrbar::bar::Opts;
+
 fn main() {
-    // TODO: We need a config file cmd line option so that each bar can have
-    // its own config.
-    swayrbar::bar::start()
+    let opts: Opts = Opts::parse();
+    swayrbar::bar::start(opts);
 }