1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55

use fern::colors::ColoredLevelConfig;
use log::Level;
use std::collections::HashSet;
use std::io;
use std::str::FromStr;

const DEFAULT_WARNINGS: &[Diagnostic] = &[];

#[derive(PartialEq, Eq, Hash, Debug, Display, EnumString, Clone)]
#[strum(serialize_all = "kebab_case")]
pub enum Diagnostic {
    Comments,
}

macro_rules! diag {
    ($type:path, $($arg:tt)*) => (warn!(target: &$type.to_string(), $($arg)*))
}

pub fn init(mut enabled_warnings: HashSet<Diagnostic>) {
    enabled_warnings.extend(DEFAULT_WARNINGS.iter().cloned());

    let colors = ColoredLevelConfig::new();
    fern::Dispatch::new()
        .format(move |out, message, record| {
            let level_label = match record.level() {
                Level::Error => "error",
                Level::Warn => "warning",
                Level::Info => "info",
                Level::Debug => "debug",
                Level::Trace => "trace",
            };
            let target = record.target();
            let warn_flag = if let Ok(_) = Diagnostic::from_str(target) {
                format!(" [-W{}]", target)
            } else {
                String::new()
            };
            out.finish(format_args!(
                "\x1B[{}m{}:\x1B[0m {}{}",
                colors.get_color(&record.level()).to_fg_str(),
                level_label,
                message,
                warn_flag,
            ))
        })
        .level(log::LevelFilter::Warn)
        .filter(move |metadata| {
            Diagnostic::from_str(metadata.target())
                .map(|d| enabled_warnings.contains(&d))
                .unwrap_or(true)
        })
        .chain(io::stderr())
        .apply()
        .expect("Could not set up diagnostics");
}