106 lines
3.7 KiB
Rust
106 lines
3.7 KiB
Rust
use std::io::{self, BufRead};
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use std::env;
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use serde_json::Value;
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use colored_json::{ColorMode, ToColoredJson};
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use regex::{Regex, Captures};
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use once_cell::sync::Lazy;
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/// Finds the first '{' and tries to match nested braces until the corresponding '}'.
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fn find_json_block(line: &str) -> Option<(usize, usize)> {
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let start = line.find('{')?;
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let mut brace_count = 0;
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for (i, ch) in line[start..].char_indices() {
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match ch {
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'{' => brace_count += 1,
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'}' => {
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brace_count -= 1;
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if brace_count == 0 {
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return Some((start, start + i + 1));
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}
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}
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_ => {}
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}
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}
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None
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}
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static RE: Lazy<Regex> = Lazy::new(|| {
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Regex::new(r"(?i)(^|[^A-Za-z])(?P<kw>ERROR|DEBUG|INFO|LOG|EXCEPTION|WARNING|NOTICE|HINT|FATAL|DETAIL|STATEMENT)(:)").unwrap()
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});
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/// Applies color to known log keywords (e.g. ERROR, DEBUG) without coloring the colon.
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/// Captures the preceding boundary, the keyword, and the colon, then colors only the keyword.
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fn colorize_keywords(line: &str) -> String {
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let red = "\x1b[31m";
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let blue = "\x1b[34m";
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let green = "\x1b[32m";
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let yellow = "\x1b[33m";
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let magenta = "\x1b[35m";
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let cyan = "\x1b[36m";
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let reset = "\x1b[0m";
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RE.replace_all(line, |caps: &Captures| {
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let prefix = caps.get(1).unwrap().as_str();
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let keyword = caps.name("kw").unwrap().as_str();
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let suffix = caps.get(3).unwrap().as_str();
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let key = match keyword.to_lowercase().as_str() {
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"error" => format!("{}{}{}{}", prefix, red, keyword, reset),
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"debug" => format!("{}{}{}{}", prefix, blue, keyword, reset),
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"info" | "log"
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=> format!("{}{}{}{}", prefix, green, keyword, reset),
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"exception" | "fatal"
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=> format!("{}{}{}{}", prefix, magenta, keyword, reset),
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"warning" => format!("{}{}{}{}", prefix, yellow, keyword, reset),
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"notice" | "hint" | "detail" | "statement"
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=> format!("{}{}{}{}", prefix, cyan, keyword, reset),
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_ => caps[0].to_string(),
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};
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key + suffix
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}).to_string()
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}
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fn conditionally_colorize_keywords<'a>(line: &'a str, force_color: bool) -> String {
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if force_color {
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colorize_keywords(&line)
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} else if atty::is(atty::Stream::Stdout) {
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colorize_keywords(&line)
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} else {
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line.to_string()
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}
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}
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fn main() -> io::Result<()> {
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let mut force_color = false;
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for arg in env::args().skip(1) {
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if arg == "--color-output" {
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force_color = true;
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}
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}
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let stdin = io::stdin();
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for line_result in stdin.lock().lines() {
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let line = line_result?;
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if let Some((start, end)) = find_json_block(&line) {
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let candidate = &line[start..end];
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if let Ok(json) = serde_json::from_str::<Value>(candidate) {
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let pretty = serde_json::to_string_pretty(&json).unwrap();
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let colorized = if force_color {
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pretty.to_colored_json(ColorMode::On).unwrap()
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} else {
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pretty.to_colored_json_auto().unwrap()
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};
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let prefix = conditionally_colorize_keywords(&line[..start], force_color);
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let suffix = conditionally_colorize_keywords(&line[end..], force_color);
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println!("{}{}{}", prefix, colorized, suffix);
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continue;
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}
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}
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// If no valid JSON found or parsing fails, print unchanged
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println!("{}", conditionally_colorize_keywords(&line, force_color));
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}
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Ok(())
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}
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