feat: add logger to std err

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "rust_util"
-version = "0.6.40"
+version = "0.6.41"
 authors = ["Hatter Jiang <jht5945@gmail.com>"]
 edition = "2018"
 description = "Hatter's Rust Util"

examples/log.rs

@@ -1,6 +1,7 @@
 #[macro_use] extern crate rust_util;
 
 use rust_util::{XResult, SimpleError};
+use rust_util::util_msg::set_logger_std_out;
 
 // cargo run --example log
 fn main() -> XResult<()> {
@@ -20,6 +21,11 @@ error or ^"##);
 
     println!("{:?}", test_opt_result());
 
+    set_logger_std_out(false);
+    information!("Std err!");
+    warning!("Std err!");
+    set_logger_std_out(true);
+
     simple_error!("helloworld {}", 1)
 }
 

src/util_msg.rs

@@ -1,13 +1,19 @@
 use std::env;
 use std::io::{self, Write};
-use std::sync::{Arc, Mutex};
+use std::sync::{Arc, Mutex, RwLock};
 
 lazy_static! {
     pub static ref IS_ATTY: bool = is_atty();
     static ref LOGGER_LEVEL: MessageType = get_logger_level();
+    static ref LOGGER_TO_STDOUT: Arc<RwLock<bool>> = Arc::new(RwLock::new(true));
     static ref PRINT_MESSAGE_LOCK: Arc<Mutex<()>> = Arc::new(Mutex::new(()));
 }
 
+pub fn set_logger_std_out(is_std_out: bool) {
+    let mut std_out = LOGGER_TO_STDOUT.write().unwrap();
+    *std_out = is_std_out;
+}
+
 #[allow(clippy::upper_case_acronyms)]
 #[derive(Clone, Copy)]
 pub enum MessageType { DEBUG, INFO, OK, WARN, ERROR }
@@ -37,7 +43,7 @@ pub fn get_logger_level() -> MessageType {
             _ => {
                 print_message_ex(Some(term::color::YELLOW), "[WARN ]", &format!("Unknown logger level: {}, set to default INFO", logger_level));
                 MessageType::INFO
-            },
+            }
         }
     } else {
         MessageType::INFO
@@ -49,7 +55,8 @@ pub fn is_atty() -> bool {
     stdout_fileno != 0
 }
 
-pub fn print_color(color: Option<term::color::Color>, is_bold: bool, m: &str) {
+pub fn print_color(is_std_out: bool, color: Option<term::color::Color>, is_bold: bool, m: &str) {
+    if is_std_out {
         match term::stdout() {
             Some(mut t) => {
                 if *IS_ATTY {
@@ -64,27 +71,57 @@ pub fn print_color(color: Option<term::color::Color>, is_bold: bool, m: &str) {
                 } else {
                     write!(t, "{}", m).ok();
                 }
-        },
+            }
             None => print!("{}", m),
         }
+    } else {
+        match term::stderr() {
+            Some(mut t) => {
+                if *IS_ATTY {
+                    if let Some(c) = color {
+                        t.fg(c).ok();
+                    }
+                    if is_bold {
+                        t.attr(term::Attr::Bold).ok();
+                    }
+                    write!(t, "{}", m).ok();
+                    t.reset().ok();
+                } else {
+                    write!(t, "{}", m).ok();
+                }
+            }
+            None => eprint!("{}", m),
+        }
+    }
 }
 
 pub fn print_color_and_flush(color: Option<term::color::Color>, is_bold: bool, m: &str) {
-    print_color(color, is_bold, m);
+    print_color(true, color, is_bold, m);
     flush_stdout();
 }
 
 pub fn print_message_ex(color: Option<term::color::Color>, h: &str, message: &str) {
+    let is_std_out = {
+        *LOGGER_TO_STDOUT.read().unwrap()
+    };
     let mut lock = PRINT_MESSAGE_LOCK.lock().unwrap();
-    print_color(color, true, h);
+    print_color(is_std_out, color, true, h);
+    if is_std_out {
         println!(" {}", message);
+    } else {
+        eprintln!(" {}", message)
+    }
     *lock = ();
 }
 
 pub fn print_ok(message: &str) { print_message(MessageType::OK, message); }
+
 pub fn print_warn(message: &str) { print_message(MessageType::WARN, message); }
+
 pub fn print_error(message: &str) { print_message(MessageType::ERROR, message); }
+
 pub fn print_info(message: &str) { print_message(MessageType::INFO, message); }
+
 pub fn print_debug(message: &str) { print_message(MessageType::DEBUG, message); }
 
 #[inline]
@@ -155,6 +192,6 @@ pub fn get_term_width_message(message: &str, left: usize) -> String {
             s.push_str("[...]");
             s.push_str(&message[find_char_boundary(&message, len - 10)..]);
             s
-        },
+        }
     }
 }