main: Use tracing-subscriber's EnvFilter

It is more powerful than the default filter.
This syntax also allows to add other layers.

Cargo.lock

@@ -2923,6 +2923,15 @@ dependencies = [
  "xml5ever",
 ]
 
+[[package]]
+name = "matchers"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8263075bb86c5a1b1427b5ae862e8889656f126e9f77c484496e8b47cf5c5558"
+dependencies = [
+ "regex-automata 0.1.10",
+]
+
 [[package]]
 name = "matrix-pickle"
 version = "0.1.0"
@@ -4144,8 +4153,17 @@ checksum = "81bc1d4caf89fac26a70747fe603c130093b53c773888797a6329091246d651a"
 dependencies = [
  "aho-corasick",
  "memchr",
- "regex-automata",
+ "regex-automata 0.3.6",
- "regex-syntax",
+ "regex-syntax 0.7.4",
+]
+
+[[package]]
+name = "regex-automata"
+version = "0.1.10"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6c230d73fb8d8c1b9c0b3135c5142a8acee3a0558fb8db5cf1cb65f8d7862132"
+dependencies = [
+ "regex-syntax 0.6.29",
 ]
 
 [[package]]
@@ -4156,9 +4174,15 @@ checksum = "fed1ceff11a1dddaee50c9dc8e4938bd106e9d89ae372f192311e7da498e3b69"
 dependencies = [
  "aho-corasick",
  "memchr",
- "regex-syntax",
+ "regex-syntax 0.7.4",
 ]
 
+[[package]]
+name = "regex-syntax"
+version = "0.6.29"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f162c6dd7b008981e4d40210aca20b4bd0f9b60ca9271061b07f78537722f2e1"
+
 [[package]]
 name = "regex-syntax"
 version = "0.7.4"
@@ -5130,10 +5154,14 @@ version = "0.3.17"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "30a651bc37f915e81f087d86e62a18eec5f79550c7faff886f7090b4ea757c77"
 dependencies = [
+ "matchers",
  "nu-ansi-term",
+ "once_cell",
+ "regex",
  "sharded-slab",
  "smallvec",
  "thread_local",
+ "tracing",
  "tracing-core",
  "tracing-log",
 ]

Cargo.toml

@@ -63,7 +63,7 @@ strum = { version = "0.24", features = ["derive"] }
 thiserror = "1"
 tokio = { version = "1", features = ["rt", "rt-multi-thread", "sync"] }
 tracing = "0.1"
-tracing-subscriber = "0.3"
+tracing-subscriber = { version = "0.3", features = ["env-filter"] }
 url = "2"
 
 [dependencies.adw]

src/main.rs

@@ -25,6 +25,7 @@ mod window;
 use gettextrs::*;
 use gtk::{gdk::Display, gio, IconTheme};
 use once_cell::sync::Lazy;
+use tracing_subscriber::{fmt, prelude::*, EnvFilter};
 
 use self::{application::*, config::*, i18n::*, window::Window};
 
@@ -33,8 +34,10 @@ pub static RUNTIME: Lazy<tokio::runtime::Runtime> =
     Lazy::new(|| tokio::runtime::Runtime::new().unwrap());
 
 fn main() {
-    // Initialize logger, debug is carried out via debug!, info!, and warn!.
+    // Initialize logger, debug is carried out via debug!, info!, warn! and error!.
-    tracing_subscriber::fmt::init();
+    tracing_subscriber::registry()
+        .with(fmt::layer().with_filter(EnvFilter::from_default_env()))
+        .init();
 
     // Prepare i18n
     setlocale(LocaleCategory::LcAll, "");