Refined for CLI & automated usage

src/main.rs

@@ -1,42 +1,54 @@
 use image::{Rgba, RgbaImage};
+use std::env;
 use std::fs::File;
-use std::io::{self, BufReader, BufWriter, Write};
+use std::io::{BufReader, BufWriter};
+use std::process;
 
 fn main() {
-    println!("=== Neko Sprite Recolor Tool ===\n");
+    let args: Vec<String> = env::args().collect();
 
-    // Get input path
-    println!("Enter input GIF path:");
-    let input_path = read_line();
+    if args.len() < 4 {
+        print_usage(&args[0]);
+        process::exit(1);
+    }
 
-    // Get output path
-    println!("Enter output GIF path:");
-    let output_path = read_line();
+    let input_path = &args[1];
+    let output_path = &args[2];
+    let color_input = &args[3];
+    let apply_texture = args.len() > 4 && args[4].to_lowercase() == "true";
 
-    // Get target color
-    println!("Enter target color (hex, e.g., FF5733):");
-    let color_input = read_line();
-    let target_color = parse_hex_color(&color_input).expect("Invalid hex color");
+    let target_color = match parse_hex_color(color_input) {
+        Ok(color) => color,
+        Err(e) => {
+            eprintln!("Error: {}", e);
+            process::exit(1);
+        }
+    };
 
-    // Ask about texture
-    println!("Apply texture/noise? (y/n):");
-    let texture_input = read_line();
-    let apply_texture = texture_input.to_lowercase().starts_with('y');
-
-    println!("\nProcessing...");
-
-    match recolor_gif(&input_path, &output_path, target_color, apply_texture) {
-        Ok(_) => println!("✓ Successfully created: {}", output_path),
-        Err(e) => eprintln!("✗ Error: {}", e),
+    match recolor_gif(input_path, output_path, target_color, apply_texture) {
+        Ok(_) => (),
+        Err(e) => {
+            eprintln!("Error: {}", e);
+            process::exit(1);
+        }
     }
 }
 
-fn read_line() -> String {
-    let mut input = String::new();
-    io::stdin()
-        .read_line(&mut input)
-        .expect("Failed to read line");
-    input.trim().to_string()
+fn print_usage(program: &str) {
+    eprintln!(
+        "Usage: {} <input.gif> <output.gif> <color> [texture]",
+        program
+    );
+    eprintln!();
+    eprintln!("Arguments:");
+    eprintln!("  <input.gif>   Path to input GIF file");
+    eprintln!("  <output.gif>  Path to output GIF file");
+    eprintln!("  <color>       Target color in hex format (e.g., FF5733 or #FF5733)");
+    eprintln!("  [texture]     Optional: 'true' to apply texture/noise (default: false)");
+    eprintln!();
+    eprintln!("Examples:");
+    eprintln!("  {} neko.gif neko_red.gif FF0000", program);
+    eprintln!("  {} neko.gif neko_blue.gif 0066FF true", program);
 }
 
 fn parse_hex_color(hex: &str) -> Result<Rgba<u8>, String> {
@@ -75,14 +87,8 @@ fn recolor_gif(
     let mut encoder = gif::Encoder::new(writer, width, height, &[])?;
     encoder.set_repeat(gif::Repeat::Infinite)?;
 
-    let mut frame_count = 0;
-
     // Process each frame
     while let Some(frame) = decoder.read_next_frame()? {
-        frame_count += 1;
-        print!("\rProcessing frame {}...", frame_count);
-        io::stdout().flush()?;
-
         // Convert frame buffer to RgbaImage
         let mut img = RgbaImage::from_raw(width as u32, height as u32, frame.buffer.to_vec())
             .ok_or("Failed to create image from frame")?;
@@ -98,8 +104,6 @@ fn recolor_gif(
 
         encoder.write_frame(&output_frame)?;
     }
-
-    println!("\n✓ Processed {} frames", frame_count);
     Ok(())
 }