mirror of
https://github.com/clap-rs/clap
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80 lines
2.6 KiB
Rust
80 lines
2.6 KiB
Rust
// The following was taken and adapated from exa source
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// repo: https://github.com/ogham/exa
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// commit: b9eb364823d0d4f9085eb220233c704a13d0f611
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// license: MIT - Copyright (c) 2014 Benjamin Sago
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//! System calls for getting the terminal size.
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//!
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//! Getting the terminal size is performed using an ioctl command that takes
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//! the file handle to the terminal -- which in this case, is stdout -- and
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//! populates a structure containing the values.
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//!
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//! The size is needed when the user wants the output formatted into columns:
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//! the default grid view, or the hybrid grid-details view.
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#[cfg(all(feature = "wrap_help", not(target_os = "windows")))]
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use std::mem::zeroed;
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#[cfg(all(feature = "wrap_help", not(target_os = "windows")))]
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use libc::{STDOUT_FILENO, c_int, c_ulong, c_ushort};
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/// The number of rows and columns of a terminal.
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#[cfg(all(feature = "wrap_help", not(target_os = "windows")))]
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struct Winsize {
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ws_row: c_ushort,
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ws_col: c_ushort,
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}
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// Unfortunately the actual command is not standardised...
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#[cfg(any(target_os = "linux", target_os = "android"))]
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#[cfg(feature = "wrap_help")]
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static TIOCGWINSZ: c_ulong = 0x5413;
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#[cfg(any(target_os = "macos",
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target_os = "ios",
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target_os = "bitrig",
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target_os = "dragonfly",
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target_os = "freebsd",
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target_os = "netbsd",
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target_os = "openbsd"))]
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#[cfg(feature = "wrap_help")]
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static TIOCGWINSZ: c_ulong = 0x40087468;
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extern "C" {
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#[cfg(all(feature = "wrap_help", not(target_os = "windows")))]
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pub fn ioctl(fd: c_int, request: c_ulong, ...) -> c_int;
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}
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/// Runs the ioctl command. Returns (0, 0) if output is not to a terminal, or
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/// there is an error. (0, 0) is an invalid size to have anyway, which is why
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/// it can be used as a nil value.
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#[cfg(all(feature = "wrap_help", not(target_os = "windows")))]
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unsafe fn get_dimensions() -> Winsize {
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let mut window: Winsize = zeroed();
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let result = ioctl(STDOUT_FILENO, TIOCGWINSZ, &mut window);
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if result == -1 {
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zeroed()
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} else {
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window
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}
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}
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/// Query the current processes's output, returning its width and height as a
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/// number of characters. Returns `None` if the output isn't to a terminal.
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#[cfg(all(feature = "wrap_help", not(target_os = "windows")))]
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pub fn dimensions() -> Option<(usize, usize)> {
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let w = unsafe { get_dimensions() };
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if w.ws_col == 0 || w.ws_row == 0 {
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None
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} else {
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Some((w.ws_col as usize, w.ws_row as usize))
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}
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}
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#[cfg(any(not(feature = "wrap_help"), target_os = "windows"))]
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pub fn dimensions() -> Option<(usize, usize)> {
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None
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}
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