added a nix flake for building

build.rs

@@ -1,15 +1,33 @@
-use std::fs::{File, create_dir};
-use std::path::Path;
+use std::fs::File;
+use std::path::PathBuf;
+
+// This file is kind of ugly, I tried to make nix build work
 
 fn main() {
-    let dest_path = Path::new("themes/Catppuccin-Macchiato.tmTheme");
+    let manifest_dir = std::env::var("CARGO_MANIFEST_DIR").unwrap();
+    let local_theme_path = PathBuf::from(&manifest_dir).join("themes/Catppuccin-Macchiato.tmTheme");
 
-    if !dest_path.exists() {
-        let mut response = reqwest::blocking::get("https://raw.githubusercontent.com/catppuccin/bat/refs/heads/main/themes/Catppuccin%20Macchiato.tmTheme")
-            .expect("Failed to download theme");
+    let final_path = if let Ok(nix_theme_path) = std::env::var("THEME_PATH") {
+        // In case of nix build
+        println!("cargo:rerun-if-env-changed=THEME_PATH");
+        nix_theme_path
+    } else {
+        // In case of cargo
+        if !local_theme_path.exists() {
+            println!("cargo:warning=Theme not found, downloading...");
 
-        create_dir("themes").expect("Could not create themes dir");
-        let mut file = File::create(dest_path).expect("Failed to create theme file");
-        std::io::copy(&mut response, &mut file).expect("Failed to save theme");
-    }
+            std::fs::create_dir_all(local_theme_path.parent().unwrap())
+                .expect("Could not create themes directory");
+
+            let mut response = reqwest::blocking::get("https://raw.githubusercontent.com/catppuccin/bat/refs/heads/main/themes/Catppuccin%20Macchiato.tmTheme")
+                .expect("Failed to download theme");
+
+            let mut file = File::create(&local_theme_path).expect("Failed to create theme file");
+            std::io::copy(&mut response, &mut file).expect("Failed to save theme");
+        }
+
+        local_theme_path.to_str().unwrap().to_string()
+    };
+
+    println!("cargo:rustc-env=THEME_FILE_PATH={}", final_path);
 }