rnr 0.5.0

RnR is a command-line tool to rename multiple files and directories that supports regular expressions 
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use clap::{Command, CommandFactory};
use clap_complete::{generate_to, Shell};
use std::{io::Error, path::PathBuf};

include!("src/cli.rs");

const APP_NAME: &str = "rnr";

fn main() -> Result<(), Error> {
    let outdir =
        std::path::PathBuf::from(std::env::var_os("OUT_DIR").ok_or(std::io::ErrorKind::NotFound)?);

    let mut cmd = Cli::command();

    // Completion
    for &shell in Shell::value_variants() {
        generate_to(shell, &mut cmd, APP_NAME, &outdir)?;
        println!("cargo:warning={shell:?} completion file is generated.");
    }

    // Man
    for subcommand in cmd.get_subcommands() {
        let name = format!("{}-{}", APP_NAME, subcommand.get_name());
        generate_man(subcommand.clone(), &outdir, &name)?;
    }
    generate_man(cmd, &outdir, APP_NAME)?;

    Ok(())
}

fn generate_man(cmd: Command, outdir: &PathBuf, name: &str) -> Result<(), Error> {
    let man = clap_mangen::Man::new(cmd);
    let mut buffer: Vec<u8> = Default::default();
    man.render(&mut buffer)?;

    let mut man_file = outdir.join(name);
    man_file.set_extension("1");
    std::fs::write(man_file, buffer)?;
    println!("cargo:warning={name} man file is generated.");

    Ok(())
}