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helix-plus/helix-view/src/theme.rs

310 lines
9.2 KiB
Rust

use std::{
collections::HashMap,
path::{Path, PathBuf},
};
use anyhow::Context;
use helix_core::hashmap;
use log::warn;
use once_cell::sync::Lazy;
use serde::{Deserialize, Deserializer};
use toml::Value;
pub use crate::graphics::{Color, Modifier, Style};
pub static DEFAULT_THEME: Lazy<Theme> = Lazy::new(|| {
toml::from_slice(include_bytes!("../../theme.toml")).expect("Failed to parse default theme")
});
#[derive(Clone, Debug)]
pub struct Loader {
user_dir: PathBuf,
default_dir: PathBuf,
}
impl Loader {
/// Creates a new loader that can load themes from two directories.
pub fn new<P: AsRef<Path>>(user_dir: P, default_dir: P) -> Self {
Self {
user_dir: user_dir.as_ref().join("themes"),
default_dir: default_dir.as_ref().join("themes"),
}
}
/// Loads a theme first looking in the `user_dir` then in `default_dir`
pub fn load(&self, name: &str) -> Result<Theme, anyhow::Error> {
if name == "default" {
return Ok(self.default());
}
let filename = format!("{}.toml", name);
let user_path = self.user_dir.join(&filename);
let path = if user_path.exists() {
user_path
} else {
self.default_dir.join(filename)
};
let data = std::fs::read(&path)?;
toml::from_slice(data.as_slice()).context("Failed to deserialize theme")
}
pub fn read_names(path: &Path) -> Vec<String> {
std::fs::read_dir(path)
.map(|entries| {
entries
.filter_map(|entry| {
let entry = entry.ok()?;
let path = entry.path();
(path.extension()? == "toml")
.then(|| path.file_stem().unwrap().to_string_lossy().into_owned())
})
.collect()
})
.unwrap_or_default()
}
/// Lists all theme names available in default and user directory
pub fn names(&self) -> Vec<String> {
let mut names = Self::read_names(&self.user_dir);
names.extend(Self::read_names(&self.default_dir));
names
}
/// Returns the default theme
pub fn default(&self) -> Theme {
DEFAULT_THEME.clone()
}
}
#[derive(Clone, Debug)]
pub struct Theme {
scopes: Vec<String>,
styles: HashMap<String, Style>,
}
impl<'de> Deserialize<'de> for Theme {
fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
where
D: Deserializer<'de>,
{
let mut styles = HashMap::new();
if let Ok(mut colors) = HashMap::<String, Value>::deserialize(deserializer) {
// TODO: alert user of parsing failures in editor
let palette = colors
.remove("palette")
.map(|value| {
ThemePalette::try_from(value).unwrap_or_else(|err| {
warn!("{}", err);
ThemePalette::default()
})
})
.unwrap_or_default();
styles.reserve(colors.len());
for (name, style_value) in colors {
let mut style = Style::default();
if let Err(err) = palette.parse_style(&mut style, style_value) {
warn!("{}", err);
}
styles.insert(name, style);
}
}
let scopes = styles.keys().map(ToString::to_string).collect();
Ok(Self { scopes, styles })
}
}
impl Theme {
pub fn get(&self, scope: &str) -> Style {
self.try_get(scope)
.unwrap_or_else(|| Style::default().fg(Color::Rgb(0, 0, 255)))
}
pub fn try_get(&self, scope: &str) -> Option<Style> {
self.styles.get(scope).copied()
}
#[inline]
pub fn scopes(&self) -> &[String] {
&self.scopes
}
pub fn find_scope_index(&self, scope: &str) -> Option<usize> {
self.scopes().iter().position(|s| s == scope)
}
}
struct ThemePalette {
palette: HashMap<String, Color>,
}
impl Default for ThemePalette {
fn default() -> Self {
Self {
palette: hashmap! {
"black".to_string() => Color::Black,
"red".to_string() => Color::Red,
"green".to_string() => Color::Green,
"yellow".to_string() => Color::Yellow,
"blue".to_string() => Color::Blue,
"magenta".to_string() => Color::Magenta,
"cyan".to_string() => Color::Cyan,
"gray".to_string() => Color::Gray,
"light-red".to_string() => Color::LightRed,
"light-green".to_string() => Color::LightGreen,
"light-yellow".to_string() => Color::LightYellow,
"light-blue".to_string() => Color::LightBlue,
"light-magenta".to_string() => Color::LightMagenta,
"light-cyan".to_string() => Color::LightCyan,
"light-gray".to_string() => Color::LightGray,
"white".to_string() => Color::White,
},
}
}
}
impl ThemePalette {
pub fn new(palette: HashMap<String, Color>) -> Self {
let ThemePalette {
palette: mut default,
} = ThemePalette::default();
default.extend(palette);
Self { palette: default }
}
pub fn hex_string_to_rgb(s: &str) -> Result<Color, String> {
if s.starts_with('#') && s.len() >= 7 {
if let (Ok(red), Ok(green), Ok(blue)) = (
u8::from_str_radix(&s[1..3], 16),
u8::from_str_radix(&s[3..5], 16),
u8::from_str_radix(&s[5..7], 16),
) {
return Ok(Color::Rgb(red, green, blue));
}
}
Err(format!("Theme: malformed hexcode: {}", s))
}
fn parse_value_as_str(value: &Value) -> Result<&str, String> {
value
.as_str()
.ok_or(format!("Theme: unrecognized value: {}", value))
}
pub fn parse_color(&self, value: Value) -> Result<Color, String> {
let value = Self::parse_value_as_str(&value)?;
self.palette
.get(value)
.copied()
.ok_or("")
.or_else(|_| Self::hex_string_to_rgb(value))
}
pub fn parse_modifier(value: &Value) -> Result<Modifier, String> {
value
.as_str()
.and_then(|s| s.parse().ok())
.ok_or(format!("Theme: invalid modifier: {}", value))
}
pub fn parse_style(&self, style: &mut Style, value: Value) -> Result<(), String> {
if let Value::Table(entries) = value {
for (name, value) in entries {
match name.as_str() {
"fg" => *style = style.fg(self.parse_color(value)?),
"bg" => *style = style.bg(self.parse_color(value)?),
"modifiers" => {
let modifiers = value
.as_array()
.ok_or("Theme: modifiers should be an array")?;
for modifier in modifiers {
*style = style.add_modifier(Self::parse_modifier(modifier)?);
}
}
_ => return Err(format!("Theme: invalid style attribute: {}", name)),
}
}
} else {
*style = style.fg(self.parse_color(value)?);
}
Ok(())
}
}
impl TryFrom<Value> for ThemePalette {
type Error = String;
fn try_from(value: Value) -> Result<Self, Self::Error> {
let map = match value {
Value::Table(entries) => entries,
_ => return Ok(Self::default()),
};
let mut palette = HashMap::with_capacity(map.len());
for (name, value) in map {
let value = Self::parse_value_as_str(&value)?;
let color = Self::hex_string_to_rgb(value)?;
palette.insert(name, color);
}
Ok(Self::new(palette))
}
}
#[test]
fn test_parse_style_string() {
let fg = Value::String("#ffffff".to_string());
let mut style = Style::default();
let palette = ThemePalette::default();
palette.parse_style(&mut style, fg).unwrap();
assert_eq!(style, Style::default().fg(Color::Rgb(255, 255, 255)));
}
#[test]
fn test_palette() {
use helix_core::hashmap;
let fg = Value::String("my_color".to_string());
let mut style = Style::default();
let palette =
ThemePalette::new(hashmap! { "my_color".to_string() => Color::Rgb(255, 255, 255) });
palette.parse_style(&mut style, fg).unwrap();
assert_eq!(style, Style::default().fg(Color::Rgb(255, 255, 255)));
}
#[test]
fn test_parse_style_table() {
let table = toml::toml! {
"keyword" = {
fg = "#ffffff",
bg = "#000000",
modifiers = ["bold"],
}
};
let mut style = Style::default();
let palette = ThemePalette::default();
if let Value::Table(entries) = table {
for (_name, value) in entries {
palette.parse_style(&mut style, value).unwrap();
}
}
assert_eq!(
style,
Style::default()
.fg(Color::Rgb(255, 255, 255))
.bg(Color::Rgb(0, 0, 0))
.add_modifier(Modifier::BOLD)
);
}