feat: add namespace support to ColorScheme to prevent css collisions

src/color_scheme.rs

@@ -12,9 +12,19 @@ pub struct ColorScheme {
 
 impl ColorScheme {
     pub fn load(path: impl Into<PathBuf>) -> Result<Self> {
+        Self::load_with_namespace(path, "")
+    }
+
+    pub fn load_with_namespace(path: impl Into<PathBuf>, namespace: &str) -> Result<Self> {
         let path = path.into();
-        let content = std::fs::read_to_string(&path)
+        let mut content = std::fs::read_to_string(&path)
             .with_context(|| format!("reading {}", path.display()))?;
+        
+        if !namespace.is_empty() {
+            content = content.replace(".ColorScheme-", &format!(".{namespace}-ColorScheme-"));
+            content = content.replace("class=\"ColorScheme-", &format!("class=\"{namespace}-ColorScheme-"));
+        }
+        
         let colors = parse_colors(&content);
         Ok(Self {
             path,
@@ -85,7 +95,7 @@ fn parse_colors(content: &str) -> Vec<(String, String)> {
     let Some(style) = style_block(content) else {
         return Vec::new();
     };
-    let re = Regex::new(r#"\.(ColorScheme-[a-zA-Z0-9]+)\s*\{\s*color:\s*(#[a-fA-F0-9]{3,6})"#)
+    let re = Regex::new(r#"\.([a-zA-Z0-9\-]*ColorScheme-[a-zA-Z0-9]+)\s*\{\s*color:\s*(#[a-fA-F0-9]{3,6})"#)
         .expect("static regex is valid");
     re.captures_iter(style)
         .map(|c| (c[1].to_string(), c[2].to_string()))
@@ -245,4 +255,22 @@ mod tests {
 
         std::fs::remove_dir_all(&dir).ok();
     }
+
+    #[test]
+    fn load_with_namespace_rewrites_classes() {
+        let dir = std::env::temp_dir().join(format!(
+            "icon-color-tool-test-namespace-{}",
+            std::process::id()
+        ));
+        std::fs::create_dir_all(&dir).unwrap();
+        let file = dir.join("icon.svg");
+        std::fs::write(&file, SINGLE_COLOR_SVG).unwrap();
+
+        let scheme = ColorScheme::load_with_namespace(&file, "Emblem").unwrap();
+        assert!(scheme.content.contains(".Emblem-ColorScheme-Text"));
+        assert!(scheme.content.contains("class=\"Emblem-ColorScheme-Text\""));
+        assert_eq!(scheme.colors[0].0, "Emblem-ColorScheme-Text");
+
+        std::fs::remove_dir_all(&dir).ok();
+    }
 }