add --no-color option to disable colors in the terminal (#518)

add --no-color option to disable colors

this commit adds a new option to disable colors in the terminal and also
moves the logger configuration to a different crate.

Signed-off-by: Sebastian Webber <sebastian@swebber.me>

src/logger.rs

@@ -0,0 +1,14 @@
+use crate::cmd_args::{Args, LogFormat};
+use tracing_subscriber;
+
+pub fn init(args: &Args) {
+    let trace_sub = tracing_subscriber::fmt()
+        .with_max_level(args.log_level)
+        .with_ansi(!args.no_color);
+
+    match args.log_format {
+        LogFormat::Structured => trace_sub.json().init(),
+        LogFormat::Debug => trace_sub.pretty().init(),
+        _ => trace_sub.init(),
+    };
+}