feat: provide default themes (zellij-org#2307)

* refactor: move themes to zellij-assets

* feat: add theme to the binary

* chore: move new theme from example to assets

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/src/consts.rs

@@ -1,5 +1,6 @@
 //! Zellij program-wide constants.
 
+use crate::input::theme::Themes;
 use directories_next::ProjectDirs;
 use lazy_static::lazy_static;
 use once_cell::sync::OnceCell;
@@ -28,6 +29,19 @@ lazy_static! {
     pub static ref ZELLIJ_PROJ_DIR: ProjectDirs =
         ProjectDirs::from("org", "Zellij Contributors", "Zellij").unwrap();
     pub static ref ZELLIJ_CACHE_DIR: PathBuf = ZELLIJ_PROJ_DIR.cache_dir().to_path_buf();
+    pub static ref ZELLIJ_DEFAULT_THEMES: Themes = {
+        let mut default_themes = Themes::default();
+
+        let path = PathBuf::from(concat!(env!("CARGO_MANIFEST_DIR"), "/assets/themes"));
+        match Themes::from_dir(path) {
+            Ok(themes) => {
+                default_themes = default_themes.merge(themes);
+            },
+            Err(_) => {},
+        }
+
+        default_themes
+    };
 }
 
 pub const FEATURES: &[&str] = &[

zellij-utils/src/kdl/mod.rs

@@ -1758,4 +1758,18 @@ impl Themes {
         let all_themes_in_file = Themes::from_kdl(kdl_themes)?;
         Ok(all_themes_in_file)
     }
+
+    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

@@ -5,7 +5,7 @@ use crate::{
     cli::{CliArgs, Command},
     consts::{
         FEATURES, SYSTEM_DEFAULT_CONFIG_DIR, SYSTEM_DEFAULT_DATA_DIR_PREFIX, VERSION,
-        ZELLIJ_PROJ_DIR,
+        ZELLIJ_DEFAULT_THEMES, ZELLIJ_PROJ_DIR,
     },
     errors::prelude::*,
     input::{
@@ -63,6 +63,16 @@ pub fn get_default_data_dir() -> PathBuf {
     .unwrap_or_else(xdg_data_dir)
 }
 
+#[cfg(not(test))]
+fn get_default_themes() -> Themes {
+    ZELLIJ_DEFAULT_THEMES.to_owned()
+}
+
+#[cfg(test)]
+fn get_default_themes() -> Themes {
+    Themes::default()
+}
+
 pub fn xdg_config_dir() -> PathBuf {
     ZELLIJ_PROJ_DIR.config_dir().to_owned()
 }
@@ -310,25 +320,13 @@ 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_theme_dir) = user_theme_dir {
+            config.themes = config.themes.merge(Themes::from_dir(user_theme_dir)?);
         }
 
         if let Some(Command::Setup(ref setup)) = &cli_args.command {