Major restructuring of theme/syntax handling

src/bin/bat/assets.rs

@@ -0,0 +1,37 @@
+use std::borrow::Cow;
+use std::fs;
+use std::path::PathBuf;
+
+use crate::directories::PROJECT_DIRS;
+
+use bat::assets::HighlightingAssets;
+
+fn theme_set_path() -> PathBuf {
+    PROJECT_DIRS.cache_dir().join("themes.bin")
+}
+
+fn syntax_set_path() -> PathBuf {
+    PROJECT_DIRS.cache_dir().join("syntaxes.bin")
+}
+
+pub fn config_dir() -> Cow<'static, str> {
+    PROJECT_DIRS.config_dir().to_string_lossy()
+}
+
+pub fn cache_dir() -> Cow<'static, str> {
+    PROJECT_DIRS.cache_dir().to_string_lossy()
+}
+
+pub fn clear_assets() {
+    print!("Clearing theme set cache ... ");
+    fs::remove_file(theme_set_path()).ok();
+    println!("okay");
+
+    print!("Clearing syntax set cache ... ");
+    fs::remove_file(syntax_set_path()).ok();
+    println!("okay");
+}
+
+pub fn assets_from_cache_or_binary() -> HighlightingAssets {
+    HighlightingAssets::from_cache(&theme_set_path(), &syntax_set_path()).unwrap_or(HighlightingAssets::from_binary())
+}