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driver: Add env var to control log colors 

The log color variable is whatever the log variable is (`RUSTC_LOG`,
`RUSTDOC_LOG`, `MIRI_LOG`, etc.) + `_COLOR`. So `RUSTC_LOG_COLOR`,
`RUSTDOC_LOG_COLOR`, `MIRI_LOG_COLOR`, etc.

Thanks to @RalfJung for suggesting this! It was much easier to implement
than adding a new unstable argument, which is what I tried before.
This commit is contained in:
Camelid 2020-10-30 14:11:46 -07:00
parent d282aca273
commit 8ad1a1cf39
1 changed files with 13 additions and 1 deletions
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14
compiler/rustc_driver/src/lib.rs
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@ -1283,10 +1283,22 @@ pub fn init_env_logger(env: &str) {
Ok(s) if s.is_empty() => return,
Ok(_) => {}
}
let color_logs = match std::env::var(String::from(env) + "_COLOR") {
Ok(value) => match value.as_ref() {
"always" => true,
"never" => false,
"auto" => stdout_isatty(),
_ => panic!("invalid log color value '{}': expected one of always, never, or auto", value),
},
Err(std::env::VarError::NotPresent) => stdout_isatty(),
Err(std::env::VarError::NotUnicode(_value)) => {
panic!("non-unicode log color value: expected one of always, never, or auto")
}
};
let filter = tracing_subscriber::EnvFilter::from_env(env);
let layer = tracing_tree::HierarchicalLayer::default()
.with_indent_lines(true)
.with_ansi(stdout_isatty())
.with_ansi(color_logs)
.with_targets(true)
.with_thread_ids(true)
.with_thread_names(true)