feat: add self-provided themes (zellij-org#2224)

* chore: move themes to default assets

* feat: add self-provided themes

* fix: embed themes into binary

example/themes/README.md

@@ -1,19 +1,5 @@
 # Themes
 
-Themes can contain different flavors in one file, or can be created as individual files.
+It contains examples showing how to write a theme.
 
-Example:
-
-```
-gruvbox.kdl
-├─ gruvbox-light
-└─ gruvbox-dark
-
-or
-
-gruvbox-light.kdl
-└─ gruvbox-light
-
-gruvbox-dark.kdl
-└─ gruvbox-dark
-```
+If you would like to add a theme to zellij, please refer [zellij-utils/assets/themes](../../zellij-utils/assets/themes).

example/themes/example.kdl

@@ -0,0 +1,34 @@
+// This file shows how to write a theme file
+// using `gruvbox` theme.
+
+themes {
+	// example of how to set a theme in RGB format
+	gruvbox-light {
+		fg 60 56 54
+        bg 251 82 75
+        black 40 40 40
+        red 205 75 69
+        green 152 151 26
+        yellow 215 153 33
+        blue 69 133 136
+        magenta 177 98 134
+        cyan 104 157 106
+        white 213 196 161
+        orange 214 93 14
+	}
+
+	// example of how to set a theme in HEX format
+	gruvbox-dark {
+		fg "#D5C4A1"
+		bg "#282828"
+		black "#3C3836"
+		red "#CC241D"
+		green "#98971A"
+		yellow "#D79921"
+		blue "#3C8588"
+		magenta "#B16286"
+		cyan "#689D6A"
+		white "#FBF1C7"
+		orange "#D65D0E"
+	}
+}

zellij-utils/Cargo.toml

@@ -38,6 +38,7 @@ miette = { version = "3.3.0", features = ["fancy"] }
 regex = "1.5.5"
 tempfile = "3.2.0"
 kdl = { version = "4.5.0", features = ["span"] }
+include_dir = "0.7.3"
 
 #[cfg(not(target_family = "wasm"))]
 [target.'cfg(not(target_family = "wasm"))'.dependencies]

zellij-utils/src/consts.rs

@@ -1,6 +1,7 @@
 //! Zellij program-wide constants.
 
 use directories_next::ProjectDirs;
+use include_dir::{include_dir, Dir};
 use lazy_static::lazy_static;
 use once_cell::sync::OnceCell;
 use std::path::PathBuf;
@@ -15,6 +16,7 @@ pub static DEBUG_MODE: OnceCell<bool> = OnceCell::new();
 
 pub const SYSTEM_DEFAULT_CONFIG_DIR: &str = "/etc/zellij";
 pub const SYSTEM_DEFAULT_DATA_DIR_PREFIX: &str = system_default_data_dir();
+pub static ZELLIJ_THEMES_DIR: Dir = include_dir!("$CARGO_MANIFEST_DIR/assets/themes");
 
 const fn system_default_data_dir() -> &'static str {
     if let Some(data_dir) = std::option_env!("PREFIX") {

zellij-utils/src/kdl/mod.rs

@@ -1734,12 +1734,8 @@ impl Themes {
         Ok(themes)
     }
 
-    pub fn from_path(path_to_theme_file: PathBuf) -> Result<Self, ConfigError> {
-        // String is the theme name
-        let mut file = File::open(path_to_theme_file.clone())?;
-        let mut kdl_config = String::new();
-        file.read_to_string(&mut kdl_config)?;
-        let kdl_config: KdlDocument = kdl_config.parse()?;
+    pub fn from_string(raw_string: String) -> Result<Self, ConfigError> {
+        let kdl_config: KdlDocument = raw_string.parse()?;
         let kdl_themes = kdl_config.get("themes").ok_or(ConfigError::new_kdl_error(
             "No theme node found in file".into(),
             kdl_config.span().offset(),
@@ -1748,4 +1744,26 @@ impl Themes {
         let all_themes_in_file = Themes::from_kdl(kdl_themes)?;
         Ok(all_themes_in_file)
     }
+
+    pub fn from_path(path_to_theme_file: PathBuf) -> Result<Self, ConfigError> {
+        // String is the theme name
+        let mut file = File::open(path_to_theme_file.clone())?;
+        let mut kdl_config = String::new();
+        file.read_to_string(&mut kdl_config)?;
+        Themes::from_string(kdl_config)
+    }
+
+    pub fn from_dir(path_to_theme_dir: PathBuf) -> Result<Self, ConfigError> {
+        let mut themes = Themes::default();
+        for entry in std::fs::read_dir(path_to_theme_dir)? {
+            let entry = entry?;
+            let path = entry.path();
+            if let Some(extension) = path.extension() {
+                if extension == "kdl" {
+                    themes = themes.merge(Themes::from_path(path)?);
+                }
+            }
+        }
+        Ok(themes)
+    }
 }

zellij-utils/src/setup.rs

@@ -1,5 +1,6 @@
 #[cfg(not(target_family = "wasm"))]
 use crate::consts::ASSET_MAP;
+use crate::consts::ZELLIJ_THEMES_DIR;
 use crate::input::theme::Themes;
 use crate::{
     cli::{CliArgs, Command},
@@ -51,6 +52,22 @@ fn default_config_dirs() -> Vec<Option<PathBuf>> {
     ]
 }
 
+#[cfg(not(test))]
+fn get_default_themes() -> Result<Themes, ConfigError> {
+    let mut themes = Themes::default();
+    for entry in ZELLIJ_THEMES_DIR.files() {
+        if let Some(entry) = entry.contents_utf8() {
+            themes = themes.merge(Themes::from_string(entry.to_string())?);
+        }
+    }
+    Ok(themes)
+}
+
+#[cfg(test)]
+fn get_default_themes() -> Result<Themes, ConfigError> {
+    Ok(Themes::default())
+}
+
 /// Looks for an existing dir, uses that, else returns a
 /// dir matching the config spec.
 pub fn get_default_data_dir() -> PathBuf {
@@ -87,6 +104,7 @@ pub fn get_layout_dir(config_dir: Option<PathBuf>) -> Option<PathBuf> {
 pub fn get_theme_dir(config_dir: Option<PathBuf>) -> Option<PathBuf> {
     config_dir.map(|dir| dir.join("themes"))
 }
+
 pub fn dump_asset(asset: &[u8]) -> std::io::Result<()> {
     std::io::stdout().write_all(asset)?;
     Ok(())
@@ -310,25 +328,13 @@ impl Setup {
             None => config.options.clone(),
         };
 
-        if let Some(theme_dir) = config_options
-            .theme_dir
-            .clone()
-            .or_else(|| get_theme_dir(cli_args.config_dir.clone().or_else(find_default_config_dir)))
-        {
-            if theme_dir.is_dir() {
-                for entry in (theme_dir.read_dir()?).flatten() {
-                    if let Some(extension) = entry.path().extension() {
-                        if extension == "kdl" {
-                            match Themes::from_path(entry.path()) {
-                                Ok(themes) => config.themes = config.themes.merge(themes),
-                                Err(e) => {
-                                    log::error!("error loading theme file: {:?}", e);
-                                },
-                            }
-                        }
-                    }
-                }
-            }
+        config.themes = config.themes.merge(get_default_themes()?);
+
+        let user_theme_dir = config_options.theme_dir.clone().or_else(|| {
+            get_theme_dir(cli_args.config_dir.clone().or_else(find_default_config_dir))
+        });
+        if let Some(user_dir) = user_theme_dir {
+            config.themes = config.themes.merge(Themes::from_dir(user_dir)?);
         }
 
         if let Some(Command::Setup(ref setup)) = &cli_args.command {
@@ -514,6 +520,7 @@ impl Setup {
 
         Ok(())
     }
+
     fn generate_completion(shell: &str) {
         let shell: Shell = match shell.to_lowercase().parse() {
             Ok(shell) => shell,
@@ -564,6 +571,7 @@ impl Setup {
             _ => {},
         }
     }
+
     fn parse_layout_and_override_config(
         cli_config_options: Option<&Options>,
         config: Config,
@@ -593,6 +601,7 @@ impl Setup {
         // that needs to take precedence
         Layout::from_path_or_default(chosen_layout.as_ref(), layout_dir.clone(), config)
     }
+
     fn handle_setup_commands(cli_args: &CliArgs) {
         if let Some(Command::Setup(ref setup)) = &cli_args.command {
             setup.from_cli().map_or_else(