introduce colored log levels using ansi_term

Cargo.toml

@@ -26,4 +26,5 @@ default = ["termcolor"]
 log = { version = "0.4.*", features = ["std"] }
 termcolor = { version = "1.1.*", optional = true }
 paris = { version = "1.5.7", optional = true }
+ansi_term = { version = "0.12", optional = true }
 chrono = "0.4.1"

src/config.rs

@@ -79,6 +79,7 @@ pub struct Config {
     pub(crate) filter_ignore: Cow<'static, [Cow<'static, str>]>,
     #[cfg(feature = "termcolor")]
     pub(crate) level_color: [Option<Color>; 6],
+    pub(crate) write_log_enable_colors: bool,
 }
 
 /// Builder for the Logger Configurations (`Config`)
@@ -194,6 +195,12 @@ impl ConfigBuilder {
         self
     }
 
+    /// set if you want to write colors in the logfile (default is Off)
+    pub fn set_write_log_enable_colors(&mut self, local: bool) -> &mut ConfigBuilder {
+        self.0.write_log_enable_colors = local;
+        self
+    }
+
     /// Add allowed module filters.
     /// If any are specified, only records from modules starting with one of these entries will be printed
     ///
@@ -281,6 +288,7 @@ impl Default for Config {
             time_local: false,
             filter_allow: Cow::Borrowed(&[]),
             filter_ignore: Cow::Borrowed(&[]),
+            write_log_enable_colors: false,
 
             #[cfg(feature = "termcolor")]
             level_color: [

src/loggers/logging.rs

@@ -3,6 +3,23 @@ use crate::{Config, LevelPadding, ThreadLogMode, ThreadPadding};
 use log::{LevelFilter, Record};
 use std::io::{Error, Write};
 use std::thread;
+#[cfg(all(feature = "termcolor", feature = "ansi_term"))]
+use termcolor::Color;
+
+#[cfg(all(feature = "termcolor", feature = "ansi_term"))]
+pub fn termcolor_to_ansiterm(color: &Color) -> Option<ansi_term::Color> {
+    match color {
+        Color::Black => Some(ansi_term::Color::Black),
+        Color::Red => Some(ansi_term::Color::Red),
+        Color::Green => Some(ansi_term::Color::Green),
+        Color::Yellow => Some(ansi_term::Color::Yellow),
+        Color::Blue => Some(ansi_term::Color::Blue),
+        Color::Magenta => Some(ansi_term::Color::Purple),
+        Color::Cyan => Some(ansi_term::Color::Cyan),
+        Color::White => Some(ansi_term::Color::White),
+        _ => None,
+    }
+}
 
 #[inline(always)]
 pub fn try_log<W>(config: &Config, record: &Record<'_>, write: &mut W) -> Result<(), Error>
@@ -63,11 +80,33 @@ pub fn write_level<W>(record: &Record<'_>, write: &mut W, config: &Config) -> Re
 where
     W: Write + Sized,
 {
-    match config.level_padding {
-        LevelPadding::Left => write!(write, "[{: >5}] ", record.level())?,
-        LevelPadding::Right => write!(write, "[{: <5}] ", record.level())?,
-        LevelPadding::Off => write!(write, "[{}] ", record.level())?,
+    #[cfg(all(feature = "termcolor", feature = "ansi_term"))]
+    let color = match &config.level_color[record.level() as usize] {
+        Some(termcolor) => {
+            if config.write_log_enable_colors {
+                termcolor_to_ansiterm(termcolor)
+            } else {
+                None
+            }
+        }
+        None => None,
+    };
+
+    let level = match config.level_padding {
+        LevelPadding::Left => format!("[{: >5}]", record.level()),
+        LevelPadding::Right => format!("[{: <5}]", record.level()),
+        LevelPadding::Off => format!("[{}]", record.level()),
+    };
+
+    #[cfg(all(feature = "termcolor", feature = "ansi_term"))]
+    match color {
+        Some(c) => write!(write, "{} ", c.paint(level))?,
+        None => write!(write, "{} ", level)?,
     };
+
+    #[cfg(not(feature = "ansi_term"))]
+    write!(write, "{} ", level)?;
+
     Ok(())
 }
 

src/loggers/termlog.rs

@@ -5,7 +5,9 @@ use log::{
 };
 use std::io::{Error, Write};
 use std::sync::Mutex;
-use termcolor::{BufferedStandardStream, ColorChoice, ColorSpec, WriteColor};
+use termcolor::{BufferedStandardStream, ColorChoice};
+#[cfg(not(feature = "ansi_term"))]
+use termcolor::{ColorSpec, WriteColor};
 
 use super::logging::*;
 
@@ -128,16 +130,25 @@ impl TermLogger {
         record: &Record<'_>,
         term_lock: &mut BufferedStandardStream,
     ) -> Result<(), Error> {
+        #[cfg(not(feature = "ansi_term"))]
         let color = self.config.level_color[record.level() as usize];
 
         if self.config.time <= record.level() && self.config.time != LevelFilter::Off {
             write_time(term_lock, &self.config)?;
         }
 
         if self.config.level <= record.level() && self.config.level != LevelFilter::Off {
-            term_lock.set_color(ColorSpec::new().set_fg(color))?;
+            #[cfg(not(feature = "ansi_term"))]
+            if !self.config.write_log_enable_colors {
+                term_lock.set_color(ColorSpec::new().set_fg(color))?;
+            }
+
             write_level(record, term_lock, &self.config)?;
-            term_lock.reset()?;
+
+            #[cfg(not(feature = "ansi_term"))]
+            if !self.config.write_log_enable_colors {
+                term_lock.reset()?;
+            }
         }
 
         if self.config.thread <= record.level() && self.config.thread != LevelFilter::Off {

src/paris_macros/mod.rs

@@ -2,7 +2,7 @@
 ///
 /// Passed data uses a colorize_string formatter from a `paris` crate, so it can
 /// contains special tags for controlling ANSI colors and styles
-/// More info: https://docs.rs/paris/1.5.7/paris/formatter/fn.colorize_string.html
+/// More info: <https://docs.rs/paris/1.5.7/paris/formatter/fn.colorize_string.html>
 ///
 /// # Examples
 ///
@@ -29,7 +29,7 @@ macro_rules! info {
 ///
 /// Passed data uses a colorize_string formatter from a `paris` crate, so it can
 /// contains special tags for controlling ANSI colors and styles
-/// More info: https://docs.rs/paris/1.5.7/paris/formatter/fn.colorize_string.html
+/// More info: <https://docs.rs/paris/1.5.7/paris/formatter/fn.colorize_string.html>
 ///
 /// # Examples
 ///
@@ -55,7 +55,7 @@ macro_rules! debug {
 ///
 /// Passed data uses a colorize_string formatter from a `paris` crate, so it can
 /// contains special tags for controlling ANSI colors and styles
-/// More info: https://docs.rs/paris/1.5.7/paris/formatter/fn.colorize_string.html
+/// More info: <https://docs.rs/paris/1.5.7/paris/formatter/fn.colorize_string.html>
 ///
 /// # Examples
 ///
@@ -83,7 +83,7 @@ macro_rules! trace {
 ///
 /// Passed data uses a colorize_string formatter from a `paris` crate, so it can
 /// contains special tags for controlling ANSI colors and styles
-/// More info: https://docs.rs/paris/1.5.7/paris/formatter/fn.colorize_string.html
+/// More info: <https://docs.rs/paris/1.5.7/paris/formatter/fn.colorize_string.html>
 ///
 /// # Examples
 ///
@@ -108,7 +108,7 @@ macro_rules! warn {
 ///
 /// Passed data uses a colorize_string formatter from a `paris` crate, so it can
 /// contains special tags for controlling ANSI colors and styles
-/// More info: https://docs.rs/paris/1.5.7/paris/formatter/fn.colorize_string.html
+/// More info: <https://docs.rs/paris/1.5.7/paris/formatter/fn.colorize_string.html>
 ///
 /// # Examples
 ///