feat: add log level

crates/apps/kill_tree_cli/Cargo.toml

@@ -8,14 +8,7 @@ repository.workspace = true
 license.workspace = true
 
 [dependencies]
-kill_tree = { path = "../../libs/kill_tree", features = ["tokio", "blocking"] }
+kill_tree = { path = "../../libs/kill_tree" }
 clap = { version = "4.4.18", features = ["derive", "cargo"] }
-tokio = { version = "1.36.0", features = ["full"] }
-
-[[bin]]
-name = "kill_tree_tokio"
-path = "src/kill_tree_tokio.rs"
-
-[[bin]]
-name = "kill_tree_blocking"
-path = "src/kill_tree_blocking.rs"
+tracing = "0.1.40"
+tracing-subscriber = "0.3.18"

crates/apps/kill_tree_cli/src/kill_tree_blocking.rs → crates/apps/kill_tree_cli/src/main.rs

@@ -1,8 +1,15 @@
+use std::io;
+
 use clap::{
     builder::{styling::AnsiColor, Styles},
     command, value_parser, ArgAction, Parser,
 };
 use kill_tree::{blocking::kill_tree_with_config, Config};
+use tracing::{
+    subscriber::{self, SetGlobalDefaultError},
+    Level,
+};
+use tracing_subscriber::FmtSubscriber;
 
 fn get_styles() -> Styles {
     Styles::styled()
@@ -31,12 +38,23 @@ struct Cli {
     #[arg(help = "No logs are output.")]
     #[arg(action = ArgAction::SetTrue)]
     quiet: bool,
+
+    #[arg(long)]
+    #[arg(help = "Set the log level. Available levels: error, warn, info, debug, trace")]
+    #[arg(default_value = "warn")]
+    #[arg(value_parser = value_parser!(Level))]
+    log_level: Level,
+}
+
+fn init_log(level: Level) -> Result<(), SetGlobalDefaultError> {
+    subscriber::set_global_default(FmtSubscriber::builder().with_max_level(level).finish())
 }
 
 fn main() -> kill_tree::Result<()> {
     let cli = Cli::parse();
     let do_print = !cli.quiet;
     if do_print {
+        init_log(cli.log_level).map_err(|e| io::Error::new(io::ErrorKind::Other, e))?;
         println!(
             "Killing all of target process and its children recursively. process id: {}, signal: {}",
             cli.process_id, cli.signal

crates/libs/kill_tree/Cargo.toml

@@ -30,5 +30,6 @@ nix = { version = "0.27.1", features = ["signal"] }
 bindgen = "0.69.2"
 
 [features]
+default = ["blocking"]
 blocking = []
 tokio = ["dep:tokio"]