enabled optional logging

* added description about the env variables to README.md
[ci-build]

README.md

@@ -43,6 +43,11 @@ This pattern will make soundsense-rs ignore any cancallations related to water.
 
 The regex pattern uses the [regex crate](https://docs.rs/regex/) syntax.
 
+## Logging
+You can set the following environment variables to set the logging parameters. (Disabled on Windows releases)
+* __SOUNDSENSE_RS_LOG__: set the level of logging. _(trace, debug, info, warn, error; default: warn)_
+* __SOUNDSENSE_RS_LOG_STYLE__: st the level of the log style. _(always, never; default: always)_
+
 ## Dependencies
 Linux: libasound2, libgtk-3, libwebkit2gtk-4.0
 

src/main.rs

@@ -5,15 +5,17 @@ use std::env;
 use std::sync::mpsc::channel;
 use std::path::PathBuf;
 use regex::Regex;
-#[macro_use]
-extern crate log;
+#[macro_use] extern crate log;
 
 mod sound;
 mod ui;
 mod message;
 
 fn main() {
-    env_logger::init();
+    let env = env_logger::Env::default()
+        .filter_or("SOUNDSENSE_RS_LOG", "warn")
+        .write_style_or("SOUNDSENSE_RS_LOG_STYLE", "always");
+    env_logger::init_from_env(env);
     info!("Starting SoundSense-RS");
     let args: Vec<String> = env::args().collect();
     let mut opts = getopts::Options::new();

src/sound.rs

@@ -80,7 +80,6 @@ pub struct SoundEntry {
 }
 
 pub fn run(sound_rx: Receiver<SoundMessage>, ui_tx: Sender<UIMessage>) {
-
     loop {
         info!("(Re)Starting sound thread.");
         let mut manager : Option<SoundManager> = None;