diff options
Diffstat (limited to 'src/theming.rs')
| -rw-r--r-- | src/theming.rs | 161 |
1 files changed, 161 insertions, 0 deletions
diff --git a/src/theming.rs b/src/theming.rs new file mode 100644 index 00000000..ff108663 --- /dev/null +++ b/src/theming.rs @@ -0,0 +1,161 @@ +use enum_set::{CLike, EnumSet}; +use ncurses::{attr_t, init_pair, A_BLINK, A_BOLD, A_ITALIC, A_UNDERLINE, COLORS, COLOR_PAIR}; +use std::collections::HashMap; +use std::mem; +use std::sync::Mutex; + +#[derive(Debug, PartialEq, Clone, Copy)] +#[repr(u32)] +pub enum Attr { + Bold, + Italic, + Underline, + Blink, +} + +impl Attr { + pub fn get_attron(&self) -> attr_t { + match *self { + Attr::Bold => A_BOLD(), + Attr::Italic => A_ITALIC(), + Attr::Underline => A_UNDERLINE(), + Attr::Blink => A_BLINK(), + } + } +} + +impl CLike for Attr { + fn to_u32(&self) -> u32 { + *self as u32 + } + + unsafe fn from_u32(v: u32) -> Self { + mem::transmute(v) + } +} + +named!( + pub(crate) parse_attrs<&str, EnumSet<Attr>>, + do_parse!( + vec: many0!(alt_complete!( + tag!("b") => { |_| Attr::Bold } | + tag!("i") => { |_| Attr::Italic } | + tag!("u") => { |_| Attr::Underline } | + tag!("a") => { |_| Attr::Blink } + )) >> + ({ + let mut set = EnumSet::new(); + set.extend(vec); + set + }) + ) +); + +lazy_static! { + // TODO: probably replace that mutex with an atomic. + static ref NEXT_PAIR: Mutex<i16> = Mutex::new(1); + + /// a dict "color tuple -> color_pair" + /// Each time we use a color tuple, we check if it has already been used. + /// If not we create a new color_pair and keep it in that dict, to use it + /// the next time. + static ref COLOURS_DICT: Mutex<HashMap<(i16, i16), i16>> = { + Mutex::new(HashMap::new()) + }; + + static ref TABLE_256_TO_16: Vec<u8> = vec![ + 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, + 0, 4, 4, 4, 12, 12, 2, 6, 4, 4, 12, 12, 2, 2, 6, 4, + 12, 12, 2, 2, 2, 6, 12, 12, 10, 10, 10, 10, 14, 12, 10, 10, + 10, 10, 10, 14, 1, 5, 4, 4, 12, 12, 3, 8, 4, 4, 12, 12, + 2, 2, 6, 4, 12, 12, 2, 2, 2, 6, 12, 12, 10, 10, 10, 10, + 14, 12, 10, 10, 10, 10, 10, 14, 1, 1, 5, 4, 12, 12, 1, 1, + 5, 4, 12, 12, 3, 3, 8, 4, 12, 12, 2, 2, 2, 6, 12, 12, + 10, 10, 10, 10, 14, 12, 10, 10, 10, 10, 10, 14, 1, 1, 1, 5, + 12, 12, 1, 1, 1, 5, 12, 12, 1, 1, 1, 5, 12, 12, 3, 3, + 3, 7, 12, 12, 10, 10, 10, 10, 14, 12, 10, 10, 10, 10, 10, 14, + 9, 9, 9, 9, 13, 12, 9, 9, 9, 9, 13, 12, 9, 9, 9, 9, + 13, 12, 9, 9, 9, 9, 13, 12, 11, 11, 11, 11, 7, 12, 10, 10, + 10, 10, 10, 14, 9, 9, 9, 9, 9, 13, 9, 9, 9, 9, 9, 13, + 9, 9, 9, 9, 9, 13, 9, 9, 9, 9, 9, 13, 9, 9, 9, 9, + 9, 13, 11, 11, 11, 11, 11, 15, 0, 0, 0, 0, 0, 0, 8, 8, + 8, 8, 8, 8, 7, 7, 7, 7, 7, 7, 15, 15, 15, 15, 15, 15 + ]; +} + +fn colour_256_to_16(colour: i16) -> i16 { + if colour == -1 { + return -1; + } + return TABLE_256_TO_16[colour as usize] as i16; +} + +fn get_pair(fg: i16, bg: i16) -> attr_t { + let mut dict = COLOURS_DICT.lock().unwrap(); + if let Some(val) = dict.get(&(fg, bg)) { + return COLOR_PAIR(*val); + } + let mut pair_mut = NEXT_PAIR.lock().unwrap(); + let pair = *pair_mut; + init_pair(pair, fg, bg); + dict.insert((fg, bg), pair); + *pair_mut += 1; + COLOR_PAIR(pair) +} + +/// Takes a color tuple (as defined at the top of this file) and +/// returns a valid curses attr that can be passed directly to attron() or attroff() +pub fn curses_attr(mut fg: i16, mut bg: i16, mut attrs: EnumSet<Attr>) -> attr_t { + if COLORS() < 256 { + // We are not in a term supporting 256 colors, so we convert + // colors to numbers between -1 and 8. + fg = colour_256_to_16(fg); + bg = colour_256_to_16(bg); + if fg >= 8 { + fg -= 8; + attrs.insert(Attr::Bold); + } + if bg >= 8 { + bg -= 8; + } + }; + let mut pair = get_pair(fg, bg); + for attr in attrs.iter() { + pair |= attr.get_attron(); + } + pair +} + +#[cfg(test)] +mod tests { + use super::*; + + #[test] + fn none() { + let attrs = ""; + let expected = EnumSet::new(); + let received = parse_attrs(attrs).unwrap(); + assert_eq!(received.1, expected); + } + + #[test] + fn bold_twice() { + let attrs = "bb"; + let mut expected = EnumSet::new(); + expected.insert(Attr::Bold); + let received = parse_attrs(attrs).unwrap(); + assert_eq!(received.1, expected); + } + + #[test] + fn all() { + let attrs = "baiu"; + let mut expected = EnumSet::new(); + expected.insert(Attr::Bold); + expected.insert(Attr::Blink); + expected.insert(Attr::Italic); + expected.insert(Attr::Underline); + let received = parse_attrs(attrs).unwrap(); + assert_eq!(received.1, expected); + } +} |