feat: pop-launcher plugin logging when RUST_LOG=debug enables it

Cargo.lock

@@ -1152,6 +1152,7 @@ dependencies = [
 name = "pop-launcher-bin"
 version = "1.2.0"
 dependencies = [
+ "dirs 4.0.0",
  "pop-launcher-plugins",
  "pop-launcher-service",
  "tokio",

bin/Cargo.toml

@@ -12,7 +12,8 @@ pop-launcher-plugins = { path = "../plugins" }
 pop-launcher-service = { path = "../service" }
 tracing = "0.1.32"
 tracing-subscriber = { version = "0.3.9", features = ["env-filter"] }
+dirs = "4.0.0"
 
 [dependencies.tokio]
 version = "1.17.0"
-features = ["rt"]
+features = ["rt"]

bin/src/main.rs

@@ -3,18 +3,15 @@
 
 use pop_launcher_plugins as plugins;
 use pop_launcher_service as service;
-use std::io;
 
 #[tokio::main(flavor = "current_thread")]
 async fn main() {
-    tracing_subscriber::fmt()
-        .with_writer(io::stderr)
-        .with_env_filter(tracing_subscriber::EnvFilter::from_default_env())
-        .init();
-
     if let Some(plugin) = std::env::args().next() {
         let start = plugin.rfind('/').map(|v| v + 1).unwrap_or(0);
         let cmd = &plugin.as_str()[start..];
+
+        init_logging(cmd);
+
         match cmd {
             "calc" => plugins::calc::main().await,
             "desktop-entries" => plugins::desktop_entries::main().await,
@@ -33,3 +30,28 @@ async fn main() {
         }
     }
 }
+
+fn init_logging(cmd: &str) {
+    let logdir = match dirs::state_dir() {
+        Some(dir) => dir.join("pop-launcher/"),
+        None => dirs::home_dir()
+            .expect("home directory required")
+            .join(".cache/pop-launcher"),
+    };
+
+    let _ = std::fs::create_dir_all(&logdir);
+
+    let logfile = std::fs::OpenOptions::new()
+        .create(true)
+        .truncate(true)
+        .write(true)
+        .open(logdir.join([cmd, ".log"].concat().as_str()).as_path());
+
+    if let Ok(file) = logfile {
+        use tracing_subscriber::{fmt, EnvFilter};
+        fmt()
+            .with_env_filter(EnvFilter::from_default_env())
+            .with_writer(file)
+            .init();
+    }
+}