marksonnet 0.1.0

#![allow(unused)]

use clap::Parser;
use marksonnet;
use pulldown_cmark_to_cmark::cmark;
use std::error::Error;
use std::fs;
use std::io;
use std::io::BufWriter;
use std::path::PathBuf;
use std::process;
use std::result;

#[derive(Parser)]
#[command(version, about, long_about = None)]
struct CLI {
    /// Source file path, or stdin if omitted
    source: Option<String>,

    /// Optional output file path, or stdout if omitted
    #[arg(short, long)]
    output: Option<String>,

    /// Optional list of Jsonnet library paths to load imports from.
    #[arg(short = 'J', long, action = clap::ArgAction::Append)]
    jpaths: Vec<PathBuf>,
}

impl CLI {
    fn source(&self) -> io::Result<String> {
        match &self.source {
            Some(path) => Ok(fs::read_to_string(path)?),
            None => Ok(io::read_to_string(io::stdin())?),
        }
    }

    fn output(&self) -> io::Result<Box<dyn io::Write>> {
        match &self.output {
            Some(path) => Ok(Box::new(fs::File::create(path)?)),
            None => Ok(Box::new(io::stdout())),
        }
    }
}

fn main() {
    let mut cli = CLI::parse();

    if let Err(e) = run(&mut cli) {
        eprintln!("Application error: {e}");
        process::exit(1);
    }
}

fn run(cli: &mut CLI) -> Result<(), Box<dyn Error>> {
    let source = cli.source()?;
    let mut output = cli.output()?;

    let parser = marksonnet::Parser::new(&source).with_library_paths(&cli.jpaths);
    let mut result = String::new();

    cmark(parser, &mut result)?;

    output.write(&result.into_bytes())?;
    Ok(())
}