87 lines
2.2 KiB
Rust
87 lines
2.2 KiB
Rust
//! Pancurses boilerplate code.
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use std::process::exit;
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use pancurses::{
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endwin, has_colors, init_pair, initscr, noecho, start_color, ColorPair, Window, COLORS,
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COLOR_PAIRS,
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};
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use thiserror::Error;
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/// Initializes the terminal to accept user input, and creates a new
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/// Window.
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pub fn init_window() -> Result<Window, ColorError> {
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// Create a new window over the terminal.
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let window = initscr();
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// Enable keypad mode (off by default for historical reasons), so
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// we can read special keycodes other than just characters.
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window.keypad(true);
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// Disable echoing so the user doesn't see flickering in the
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// upper-left corner of the screen when they type a character.
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noecho();
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// Set up a color palette.
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init_colors()?;
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Ok(window)
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}
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/// Cleans everything up and exits the game.
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pub fn quit() -> ! {
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endwin();
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exit(0)
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}
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/// The colors on a terminal.
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#[allow(unused)]
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pub enum Color {
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Black = pancurses::COLOR_BLACK as _,
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Red = pancurses::COLOR_RED as _,
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Green = pancurses::COLOR_GREEN as _,
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Yellow = pancurses::COLOR_YELLOW as _,
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Blue = pancurses::COLOR_BLUE as _,
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Magenta = pancurses::COLOR_MAGENTA as _,
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Cyan = pancurses::COLOR_CYAN as _,
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White = pancurses::COLOR_WHITE as _,
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}
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#[derive(Error, Debug)]
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pub enum ColorError {
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#[error("colors not supported")]
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NoColors,
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#[error("too few colors (have {0}, need 8)")]
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NotEnoughColors(u32),
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#[error("too few color slots (have {0}, need 8)")]
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NotEnoughSlots(u32),
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}
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fn init_colors() -> Result<(), ColorError> {
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assert_eq!(start_color(), 0);
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if !has_colors() {
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Err(ColorError::NoColors)
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} else if COLORS() < 8 {
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Err(ColorError::NotEnoughColors(COLORS() as _))
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} else if COLOR_PAIRS() < 8 {
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Err(ColorError::NotEnoughSlots(COLOR_PAIRS() as _))
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} else {
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for n in 0..8 {
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init_pair(n, n, Color::Black as _);
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}
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Ok(())
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}
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}
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pub fn set_color(win: &Window, c: Color) {
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// This gets called for every single character; could be a
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// performance bottleneck depending on how ncurses implements it.
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if has_colors() {
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win.attron(ColorPair(c as _));
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}
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}
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