diff --git a/Cargo.lock b/Cargo.lock index e5edcaac602f..6537543a7624 100644 --- a/Cargo.lock +++ b/Cargo.lock @@ -523,6 +523,7 @@ dependencies = [ "futures-util", "helix-core", "helix-dap", + "helix-loader", "helix-lsp", "helix-tui", "log", diff --git a/helix-view/Cargo.toml b/helix-view/Cargo.toml index 266a5732f38e..b96a537d089f 100644 --- a/helix-view/Cargo.toml +++ b/helix-view/Cargo.toml @@ -17,6 +17,7 @@ term = ["crossterm"] bitflags = "1.3" anyhow = "1" helix-core = { version = "0.6", path = "../helix-core" } +helix-loader = { version = "0.6", path = "../helix-loader" } helix-lsp = { version = "0.6", path = "../helix-lsp" } helix-dap = { version = "0.6", path = "../helix-dap" } crossterm = { version = "0.25", optional = true } diff --git a/helix-view/src/theme.rs b/helix-view/src/theme.rs index fa5fa702804b..85f5cc131974 100644 --- a/helix-view/src/theme.rs +++ b/helix-view/src/theme.rs @@ -3,19 +3,28 @@ use std::{ path::{Path, PathBuf}, }; -use anyhow::Context; +use anyhow::{anyhow, Context, Result}; use helix_core::hashmap; +use helix_loader::merge_toml_values; use log::warn; use once_cell::sync::Lazy; use serde::{Deserialize, Deserializer}; -use toml::Value; +use toml::{map::Map, Value}; pub use crate::graphics::{Color, Modifier, Style}; pub static DEFAULT_THEME: Lazy = Lazy::new(|| { + // let raw_theme: Value = toml::from_slice(include_bytes!("../../theme.toml")) + // .expect("Failed to parse default theme"); + // Theme::from(raw_theme) + toml::from_slice(include_bytes!("../../theme.toml")).expect("Failed to parse default theme") }); pub static BASE16_DEFAULT_THEME: Lazy = Lazy::new(|| { + // let raw_theme: Value = toml::from_slice(include_bytes!("../../base16_theme.toml")) + // .expect("Failed to parse base 16 default theme"); + // Theme::from(raw_theme) + toml::from_slice(include_bytes!("../../base16_theme.toml")) .expect("Failed to parse base 16 default theme") }); @@ -35,24 +44,51 @@ impl Loader { } /// Loads a theme first looking in the `user_dir` then in `default_dir` - pub fn load(&self, name: &str) -> Result { + pub fn load(&self, name: &str) -> Result { if name == "default" { return Ok(self.default()); } if name == "base16_default" { return Ok(self.base16_default()); } - let filename = format!("{}.toml", name); - let user_path = self.user_dir.join(&filename); - let path = if user_path.exists() { - user_path + self.load_theme(name, name, false).map(Theme::from) + } + + // load the theme and its parent recursively and merge them + // `base_theme_name` is the theme from the config.toml, + // used to prevent some circular loading scenarios + fn load_theme( + &self, + name: &str, + base_them_name: &str, + only_default_dir: bool, + ) -> Result { + let path = self.path(name, only_default_dir); + let theme_toml = self.load_toml(path)?; + + let inherits = theme_toml.get("inherits"); + + let theme_toml = if let Some(parent_theme_name) = inherits { + let parent_theme_name = parent_theme_name.as_str().ok_or_else(|| { + anyhow!( + "Theme: expected 'inherits' to be a string: {}", + parent_theme_name + ) + })?; + + let parent_theme_toml = self.load_theme( + parent_theme_name, + base_them_name, + base_them_name == parent_theme_name, + )?; + + self.merge_themes(parent_theme_toml, theme_toml) } else { - self.default_dir.join(filename) + theme_toml }; - let data = std::fs::read(&path)?; - toml::from_slice(data.as_slice()).context("Failed to deserialize theme") + Ok(theme_toml) } pub fn read_names(path: &Path) -> Vec { @@ -70,6 +106,53 @@ impl Loader { .unwrap_or_default() } + // merge one theme into the parent theme + fn merge_themes(&self, parent_theme_toml: Value, theme_toml: Value) -> Value { + let parent_palette = parent_theme_toml.get("palette"); + let palette = theme_toml.get("palette"); + + // handle the table seperately since it needs a `merge_depth` of 2 + // this would conflict with the rest of the theme merge strategy + let palette_values = match (parent_palette, palette) { + (Some(parent_palette), Some(palette)) => { + merge_toml_values(parent_palette.clone(), palette.clone(), 2) + } + (Some(parent_palette), None) => parent_palette.clone(), + (None, Some(palette)) => palette.clone(), + (None, None) => Map::new().into(), + }; + + // add the palette correctly as nested table + let mut palette = Map::new(); + palette.insert(String::from("palette"), palette_values); + + // merge the theme into the parent theme + let theme = merge_toml_values(parent_theme_toml, theme_toml, 1); + // merge the before specially handled palette into the theme + merge_toml_values(theme, palette.into(), 1) + } + + // Loads the theme data as `toml::Value` first from the user_dir then in default_dir + fn load_toml(&self, path: PathBuf) -> Result { + let data = std::fs::read(&path)?; + + toml::from_slice(data.as_slice()).context("Failed to deserialize theme") + } + + // Returns the path to the theme with the name + // With `only_default_dir` as false the path will first search for the user path + // disabled it ignores the user path and returns only the default path + fn path(&self, name: &str, only_default_dir: bool) -> PathBuf { + let filename = format!("{}.toml", name); + + let user_path = self.user_dir.join(&filename); + if !only_default_dir && user_path.exists() { + user_path + } else { + self.default_dir.join(filename) + } + } + /// Lists all theme names available in default and user directory pub fn names(&self) -> Vec { let mut names = Self::read_names(&self.user_dir); @@ -105,52 +188,77 @@ pub struct Theme { highlights: Vec