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#[derive(Debug, Clone, Copy, PartialEq, Eq, Default)]
pub struct RgbColor {
pub r: u8,
pub g: u8,
pub b: u8,
}
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum HostAppearance {
Dark,
Light,
}
impl RgbColor {
pub fn inferred_appearance(self) -> HostAppearance {
let luminance = u32::from(self.r) * 299 + u32::from(self.g) * 587 + u32::from(self.b) * 114;
if luminance >= 128_000 {
HostAppearance::Light
} else {
HostAppearance::Dark
}
}
}
#[derive(Debug, Clone, Copy, PartialEq, Eq, Default)]
pub struct TerminalTheme {
pub foreground: Option<RgbColor>,
pub background: Option<RgbColor>,
}
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum DefaultColorKind {
Foreground,
Background,
}
pub const HOST_COLOR_QUERY_SEQUENCE: &str = "\x1b]10;?\x1b\\\x1b]11;?\x1b\\";
pub const HOST_COLOR_SCHEME_REPORT_ENABLE_SEQUENCE: &str = "\x1b[?2031h";
pub const HOST_COLOR_SCHEME_REPORT_DISABLE_SEQUENCE: &str = "\x1b[?2031l";
impl TerminalTheme {
pub fn with_color(mut self, kind: DefaultColorKind, color: RgbColor) -> Self {
match kind {
DefaultColorKind::Foreground => self.foreground = Some(color),
DefaultColorKind::Background => self.background = Some(color),
}
self
}
pub fn is_empty(self) -> bool {
self.foreground.is_none() && self.background.is_none()
}
}
pub fn parse_default_color_response(sequence: &str) -> Option<(DefaultColorKind, RgbColor)> {
let body = sequence.strip_prefix("\x1b]")?;
let body = body
.strip_suffix("\x1b\\")
.or_else(|| body.strip_suffix('\u{7}'))?;
let (command, value) = body.split_once(';')?;
let kind = match command {
"10" => DefaultColorKind::Foreground,
"11" => DefaultColorKind::Background,
_ => return None,
};
Some((kind, parse_rgb_color(value)?))
}
pub fn osc_set_default_color_sequence(kind: DefaultColorKind, color: RgbColor) -> String {
let command = match kind {
DefaultColorKind::Foreground => 10,
DefaultColorKind::Background => 11,
};
format!(
"\x1b]{command};rgb:{:02x}/{:02x}/{:02x}\x1b\\",
color.r, color.g, color.b
)
}
pub fn osc_reset_default_color_sequence(kind: DefaultColorKind) -> &'static str {
match kind {
DefaultColorKind::Foreground => "\x1b]110\x1b\\",
DefaultColorKind::Background => "\x1b]111\x1b\\",
}
}
fn parse_rgb_color(value: &str) -> Option<RgbColor> {
if let Some(rgb) = value.strip_prefix("rgb:") {
let mut parts = rgb.split('/');
return Some(RgbColor {
r: parse_hex_component(parts.next()?)?,
g: parse_hex_component(parts.next()?)?,
b: parse_hex_component(parts.next()?)?,
})
.filter(|_| parts.next().is_none());
}
if let Some(hex) = value.strip_prefix('#') {
let digits = hex.len() / 3;
if !matches!(digits, 1..=4) || hex.len() != digits * 3 {
return None;
}
return Some(RgbColor {
r: parse_hex_component(&hex[..digits])?,
g: parse_hex_component(&hex[digits..digits * 2])?,
b: parse_hex_component(&hex[digits * 2..])?,
});
}
None
}
fn parse_hex_component(component: &str) -> Option<u8> {
if component.is_empty()
|| component.len() > 4
|| !component.chars().all(|ch| ch.is_ascii_hexdigit())
{
return None;
}
let value = u32::from_str_radix(component, 16).ok()?;
let max = (1u32 << (component.len() * 4)) - 1;
Some(((value * 255 + (max / 2)) / max) as u8)
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn parses_st_terminated_rgb_response() {
let parsed = parse_default_color_response("\x1b]10;rgb:cccc/dddd/eeee\x1b\\");
assert_eq!(
parsed,
Some((
DefaultColorKind::Foreground,
RgbColor {
r: 0xcc,
g: 0xdd,
b: 0xee,
},
))
);
}
#[test]
fn parses_bel_terminated_hash_response() {
let parsed = parse_default_color_response("\x1b]11;#123456\u{7}");
assert_eq!(
parsed,
Some((
DefaultColorKind::Background,
RgbColor {
r: 0x12,
g: 0x34,
b: 0x56,
},
))
);
}
#[test]
fn default_color_reset_sequences_use_xterm_osc_numbers() {
assert_eq!(
osc_reset_default_color_sequence(DefaultColorKind::Foreground),
"\x1b]110\x1b\\"
);
assert_eq!(
osc_reset_default_color_sequence(DefaultColorKind::Background),
"\x1b]111\x1b\\"
);
}
#[test]
fn scales_short_hex_components() {
assert_eq!(parse_hex_component("f"), Some(255));
assert_eq!(parse_hex_component("80"), Some(128));
assert_eq!(parse_hex_component("800"), Some(128));
assert_eq!(parse_hex_component("8000"), Some(128));
}
}
|
