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use std::str::FromStr;
#[derive(Clone, Copy, Debug, PartialEq, Eq)]
pub enum Color {
Black,
Red,
Green,
Yellow,
Blue,
Magenta,
Cyan,
White,
BrightBlack,
BrightRed,
BrightGreen,
BrightYellow,
BrightBlue,
BrightMagenta,
BrightCyan,
BrightWhite,
}
impl Color {
pub fn to_fg_str(&self) -> &str {
match *self {
Color::Black => "30",
Color::Red => "31",
Color::Green => "32",
Color::Yellow => "33",
Color::Blue => "34",
Color::Magenta => "35",
Color::Cyan => "36",
Color::White => "37",
Color::BrightBlack => "90",
Color::BrightRed => "91",
Color::BrightGreen => "92",
Color::BrightYellow => "93",
Color::BrightBlue => "94",
Color::BrightMagenta => "95",
Color::BrightCyan => "96",
Color::BrightWhite => "97",
}
}
}
impl FromStr for Color {
type Err = ();
fn from_str(src: &str) -> Result<Self, Self::Err> {
let src = src.to_lowercase();
match src.as_ref() {
"black" => Ok(Color::Black),
"red" => Ok(Color::Red),
"green" => Ok(Color::Green),
"yellow" => Ok(Color::Yellow),
"blue" => Ok(Color::Blue),
"magenta" => Ok(Color::Magenta),
"cyan" => Ok(Color::Cyan),
"white" => Ok(Color::White),
"bright black" => Ok(Color::BrightBlack),
"bright red" => Ok(Color::BrightRed),
"bright green" => Ok(Color::BrightGreen),
"bright yellow" => Ok(Color::BrightYellow),
"bright blue" => Ok(Color::BrightBlue),
"bright magenta" => Ok(Color::BrightMagenta),
"bright cyan" => Ok(Color::BrightCyan),
"bright white" => Ok(Color::BrightWhite),
_ => Err(()),
}
}
}
use log::Level;
use std::fmt;
trait ColoredLogLevel {
fn colored(&self, color: Color) -> WithFgColor<Level>;
}
pub struct WithFgColor<T>
where
T: fmt::Display,
{
text: T,
color: Color,
}
impl<T> fmt::Display for WithFgColor<T>
where
T: fmt::Display,
{
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, "\x1B[{}m", self.color.to_fg_str())?;
fmt::Display::fmt(&self.text, f)?;
write!(f, "\x1B[0m")?;
Ok(())
}
}
#[derive(Copy, Clone)]
#[must_use = "builder methods take config by value and thus must be reassigned to variable"]
pub struct ColoredLevelConfig {
pub error: Color,
pub warn: Color,
pub info: Color,
pub debug: Color,
pub trace: Color,
}
impl ColoredLevelConfig {
#[inline]
pub fn new() -> Self {
Self::default()
}
pub fn color(self, level: Level) -> WithFgColor<Level> {
level.colored(self.get_color(level))
}
pub fn get_color(self, level: Level) -> Color {
match level {
Level::Error => self.error,
Level::Warn => self.warn,
Level::Info => self.info,
Level::Debug => self.debug,
Level::Trace => self.trace,
}
}
}
impl Default for ColoredLevelConfig {
fn default() -> Self {
ColoredLevelConfig {
error: Color::Red,
warn: Color::Yellow,
info: Color::Blue,
debug: Color::Magenta,
trace: Color::White,
}
}
}
impl ColoredLogLevel for Level {
fn colored(&self, color: Color) -> WithFgColor<Level> {
WithFgColor { text: *self, color }
}
}
static ID_COLORS: &[&str] = &[
"green", "cyan", "blue", "magenta", "white",
];
pub fn pick_color(text: &str) -> &str {
let mut total: u16 = 0;
for b in text.to_string().into_bytes() {
total += u16::from(b);
}
ID_COLORS[(total as usize) % ID_COLORS.len()]
}
#[test]
fn pick_color_test() {
let text = "main";
let color = pick_color(text);
assert_eq!(color, "cyan");
let text = "simple";
let color = pick_color(text);
assert_eq!(color, "green");
}