build.rs

use std::{
    env,
    fs::File,
    io::{self, BufRead, BufReader, BufWriter, Write},
    path::Path,
};

fn main() -> Result<(), Box<dyn std::error::Error>> {
    let out_dir = env::var("OUT_DIR")?;
    println!("{}", &out_dir);
    let out_dir = Path::new(&out_dir);
    let src_dir = Path::new("data");

    generate(
        src_dir.join("adjectives.txt"),
        out_dir.join("adjectives.rs"),
    )?;
    generate(src_dir.join("nouns.txt"), out_dir.join("nouns.rs"))?;
    Ok(())
}

fn generate(src_path: impl AsRef<Path>, dst_path: impl AsRef<Path>) -> io::Result<()> {
    let src = BufReader::new(File::open(src_path.as_ref())?);
    let mut dst = BufWriter::new(File::create(dst_path.as_ref())?);

    writeln!(dst, "[")?;
    for word in src.lines() {
        writeln!(dst, "\"{}\",", &word.unwrap())?;
    }
    writeln!(dst, "]")
}