omake/
logger.rs

1use crate::context::Context;
2
3pub const INFO: &str = "INFO";
4pub const WARN: &str = "WARN";
5pub const ERROR: &str = "ERROR";
6
7const MAX_SEVERITY_LENGTH: usize = 5;
8
9#[derive(Clone, Debug)]
10pub struct DefaultLogger {}
11
12pub trait Logger: Clone + std::fmt::Debug {
13    /// Write the message somewhere.
14    fn write(&self, msg: String);
15
16    /// Log an `INFO` message.
17    fn info(&self, msg: impl AsRef<str>, context: Option<&Context>) {
18        self.write(self.format_log(msg, INFO, context));
19    }
20
21    /// Log a `WARN` message.
22    fn warn(&self, msg: impl AsRef<str>, context: Option<&Context>) {
23        self.write(self.format_log(msg, WARN, context));
24    }
25
26    /// Log an `ERROR` message.
27    fn error(&self, msg: impl AsRef<str>, context: Option<&Context>) {
28        self.write(self.format_log(msg, ERROR, context));
29    }
30
31    /// Formatter for all log messages.
32    fn format_log(&self, msg: impl AsRef<str>, level: &str, context: Option<&Context>) -> String {
33        // Format log level and context label/line.
34        let level_display = format!("{:0width$}", level, width = MAX_SEVERITY_LENGTH);
35        let context_label = context
36            .and_then(|c| c.label())
37            .map(|l| format!("[{}] ", l))
38            .unwrap_or_default();
39
40        // Only show the context line if we are logging warnings or errors.
41        let context_line = if level == "WARN" || level == "ERROR" {
42            context
43                .and_then(|c| c.display_line())
44                .map(|l| format!("\n{}", l))
45                .unwrap_or_default()
46        } else {
47            String::new()
48        };
49
50        // Return the formatted message.
51        format!(
52            "make: {level_display} {context_label}| {}{}",
53            msg.as_ref(),
54            context_line
55        )
56    }
57}
58
59/// By default, print to `stderr`.
60impl Logger for DefaultLogger {
61    fn write(&self, msg: String) {
62        eprintln!("{}", msg);
63    }
64}
omake/logger.rs

omake/
logger.rs
