feat: add logging init

src/cmd_default.rs

@@ -9,10 +9,7 @@ impl CommandDefault {
         app.arg(Arg::with_name("verbose").long("verbose").short("v").multiple(true).help("Show verbose info"))
     }
 
-    pub fn run(arg_matches: &ArgMatches) -> CommandError {
-        let verbose_count = arg_matches.occurrences_of("verbose");
-        println!("Verbose count: {}", verbose_count);
-
+    pub fn run(_arg_matches: &ArgMatches) -> CommandError {
         error!("Default command is not implemented!");
         Ok(())
     }

src/main.rs

@@ -1,6 +1,7 @@
 #[macro_use] extern crate log;
 //#[macro_use] extern crate lazy_static;
-use clap::App;
+use log::LevelFilter;
+use clap::{ App, ArgMatches };
 
 mod cmd;
 mod cmd_default;
@@ -27,9 +28,6 @@ fn print_wa (msg: &str) {
 }
 
 fn main() -> CommandError {
-    pretty_env_logger::init();
-    info!("rust-script-tool started");
-
     let commands: Vec<Box<dyn Command>> = vec![
          Box::new(CommandNew{}),
     ];
@@ -42,6 +40,9 @@ fn main() -> CommandError {
     }
 
     let matches = app.get_matches();
+    init_log(&matches);
+    info!("rust-script-tool started");
+
     for command in &commands {
         if let Some(sub_cmd_matches) = matches.subcommand_matches(command.name()) {
             info!("matched subcommand: {}", command.name());
@@ -52,3 +53,19 @@ fn main() -> CommandError {
     info!("matched default subcommand");
     CommandDefault::run(&matches)
 }
+
+fn init_log(arg_matches: &ArgMatches) {
+     let verbose_count = arg_matches.occurrences_of("verbose");
+    if verbose_count == 0 {
+        pretty_env_logger::init();
+    } else {
+        let mut builder = pretty_env_logger::formatted_builder();
+        match verbose_count {
+            1 => builder.filter_level(LevelFilter::Warn),
+            2 => builder.filter_level(LevelFilter::Info),
+            3 => builder.filter_level(LevelFilter::Debug),
+            _ => builder.filter_level(LevelFilter::Trace),
+        };
+        builder.init();
+    }
+}