47 lines
1.7 KiB
Rust
47 lines
1.7 KiB
Rust
use std::sync::atomic::{AtomicBool, Ordering};
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use crossterm_winapi::{ConsoleMode, Handle};
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use parking_lot::Once;
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use winapi::um::wincon::ENABLE_VIRTUAL_TERMINAL_PROCESSING;
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/// Enable virtual terminal processing.
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///
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/// This method attempts to enable virtual terminal processing for this
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/// console. If there was a problem enabling it, then an error returned.
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/// On success, the caller may assume that enabling it was successful.
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///
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/// When virtual terminal processing is enabled, characters emitted to the
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/// console are parsed for VT100 and similar control character sequences
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/// that control color and other similar operations.
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fn enable_vt_processing() -> std::io::Result<()> {
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let mask = ENABLE_VIRTUAL_TERMINAL_PROCESSING;
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let console_mode = ConsoleMode::from(Handle::current_out_handle()?);
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let old_mode = console_mode.mode()?;
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if old_mode & mask == 0 {
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console_mode.set_mode(old_mode | mask)?;
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}
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Ok(())
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}
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static SUPPORTS_ANSI_ESCAPE_CODES: AtomicBool = AtomicBool::new(false);
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static INITIALIZER: Once = Once::new();
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/// Checks if the current terminal supports ANSI escape sequences
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pub fn supports_ansi() -> bool {
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INITIALIZER.call_once(|| {
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// Some terminals on Windows like GitBash can't use WinAPI calls directly
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// so when we try to enable the ANSI-flag for Windows this won't work.
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// Because of that we should check first if the TERM-variable is set
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// and see if the current terminal is a terminal who does support ANSI.
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let supported = enable_vt_processing().is_ok()
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|| std::env::var("TERM").map_or(false, |term| term != "dumb");
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SUPPORTS_ANSI_ESCAPE_CODES.store(supported, Ordering::SeqCst);
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});
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SUPPORTS_ANSI_ESCAPE_CODES.load(Ordering::SeqCst)
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}
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