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find . -name "*.flac" -maxdepth 1 -exec ffmpeg -i {} -ab 320k -map_metadata 0 -id3v2_version 3 {}.mp3 \;

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[package]
name = "music_converter"
version = "0.1.0"
edition = "2018"

# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html

[dependencies]
walkdir = "2"

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use std::borrow::Borrow;
use std::env;
use std::io;
use std::path::Path;
use std::process::{Command, Stdio};
use walkdir::WalkDir;

fn cin(print_info: &str) -> String {
    println!("{}", print_info);

    let mut input = String::new();
    io::stdin()
        .read_line(&mut input)
        .expect("Failed to read line");
    return input;
}

fn path_match<'a>(path: &'a Path, ext: &'a str, not_full_name: bool) -> Option<(&'a str, String)> {
    if not_full_name {
        if let Some(file_ext) = path.extension() {
            if file_ext.to_str().unwrap() == ext.trim() {
                let path_name = path.to_str().unwrap();

                let mut file_name = path
                    .clone()
                    .file_stem()
                    .unwrap()
                    .to_str()
                    .unwrap()
                    .to_string();
                file_name.push_str(".mp3");
                return Some((path_name.borrow(), file_name));
            } else {
                return None;
            }
        } else {
            return None;
        }
    } else {
        if ext == path.clone().file_name().unwrap().to_str().unwrap() {
            let path_name = path.to_str().unwrap();

            let mut file_name_no_ext = path
                .clone()
                .file_stem()
                .unwrap()
                .to_str()
                .unwrap()
                .to_string();

            file_name_no_ext.push_str(".mp3");
            return Some((path_name.borrow(), file_name_no_ext));
        } else {
            return None;
        }
    }
}

fn call_ffmpeg(src_name: &str, tgt_name: &str) {
    let mut child = Command::new("ffmpeg")
        .args([
            "-i",
            src_name,
            "-ab",
            "320k",
            "-map_metadata",
            "0",
            "-id3v2_version",
            "3",
            tgt_name,
        ])
        .stdout(Stdio::null())
        .spawn()
        .expect("Failed to execute command");
    let ecode = child.wait().expect("failed to wait on child");
    println!("{}", ecode);
    return;
}

fn main() {
    if let Ok(current_dir) = env::current_dir() {
        let current_dir = current_dir.as_path();
        println!("音乐转换器，请保证音乐文件在该脚本所在目录");

        loop {
            let mode = cin("输入模式，q退出，ls列出当前目录下某一拓展名的文件，r递归转换，nr非递归转换，o单文件转换");

            match mode.to_lowercase().trim() {
                "ls" => {
                    let ext = cin("输入要查看的拓展名");
                    WalkDir::new(current_dir).into_iter().for_each(|e| {
                        if let Ok(e) = e {
                            let path = e.path();
                            if let Some((src_path, _tgt_name)) = path_match(path, ext.trim(), true)
                            {
                                println!("{}", src_path);
                            }
                        }
                    });
                }
                "r" => {
                    let ext = cin("输入待转换的拓展名");

                    WalkDir::new(current_dir).into_iter().for_each(|e| {
                        if let Ok(e) = e {
                            let path = e.path();
                            if let Some((src_path, tgt_name)) = path_match(path, ext.trim(), true) {
                                call_ffmpeg(src_path, tgt_name.as_str());
                            }
                        }
                    });
                }
                "nr" => {
                    let ext = cin("输入待转换的拓展名");

                    WalkDir::new(current_dir)
                        .max_depth(1)
                        .into_iter()
                        .for_each(|e| {
                            if let Ok(e) = e {
                                let path = e.path();
                                if let Some((src_path, tgt_name)) =
                                    path_match(path, ext.trim(), true)
                                {
                                    call_ffmpeg(src_path, tgt_name.as_str());
                                }
                            }
                        });
                }
                "o" => {
                    let filename = cin("输入待转换的文件名");

                    WalkDir::new(current_dir)
                        .max_depth(1)
                        .into_iter()
                        .for_each(|e| {
                            if let Ok(e) = e {
                                let path = e.path();
                                if let Some((src_path, tgt_name)) =
                                    path_match(path, filename.trim(), false)
                                {
                                    call_ffmpeg(src_path, tgt_name.as_str());
                                }
                            }
                        });
                }
                "q" => {
                    break;
                }
                _ => {
                    println!("input not support");
                    if mode.trim() == "123" {
                        println!("hi");
                    }
                }
            };
        }
    }
}