xdr-codegen 0.1.0-alpha

XDR code generation
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extern crate mazzaroth_xdr;
extern crate pest;
extern crate structopt;
extern crate xdr_rs_serialize;

#[macro_use]
extern crate serde_derive;
#[macro_use]
extern crate handlebars;
#[macro_use]
extern crate pest_derive;

use std::path::PathBuf;
use structopt::StructOpt;
use xdr_rs_serialize::ser::*;

use std::fs::File;
use std::io::{self, Read};

mod ast;
mod generator;
mod schema;

#[derive(Debug, StructOpt)]
#[structopt(name = "xdr-codegen", about = "CLI tool for generating xdr code.")]
struct Opt {
    /// Input files, stdin if not present
    #[structopt(parse(from_os_str))]
    input: Vec<PathBuf>,

    /// Output file, stdout if not present
    #[structopt(short = "o", long = "output")]
    output: Option<PathBuf>,

    /// Output language
    #[structopt(short = "l", long = "language")]
    language: Option<String>,
}

fn main() -> io::Result<()> {
    let mut buffer = String::new();
    let stdin = io::stdin();
    let opt = Opt::from_args();

    match opt.input.len() {
        0 => {
            let mut handle = stdin.lock();
            handle.read_to_string(&mut buffer)?;
        }
        _ => {
            for file in opt.input.iter() {
                let mut f = File::open(file)?;
                f.read_to_string(&mut buffer)?;
            }
        }
    }

    let namespaces = ast::build_namespaces(buffer).unwrap();
    if opt.language == Some("schema".to_string()) {
        let schem = schema::generate_schema(namespaces).unwrap();
        match opt.output {
            None => {
                println!("{:?}", schem);
            }
            Some(path) => {
                let mut schema_bytes = Vec::new();
                schem.write_xdr(&mut schema_bytes).unwrap();
                let mut file = File::create(path.to_str().unwrap())?;
                file.write_all(&schema_bytes)?;
            }
        }
        return Ok(());
    }

    let generator: &generator::CodeGenerator = match opt.language {
        Some(language) => match language.as_ref() {
            "go" => &generator::go::GoGenerator {},
            "js" => &generator::js::JsGenerator {},
            "rust" => &generator::rust::RustGenerator {},
            _ => &generator::go::GoGenerator {},
        },
        _ => &generator::go::GoGenerator {},
    };

    let code = generator.code(namespaces).unwrap();
    match opt.output {
        None => {
            println!("{}", code);
        }
        Some(path) => {
            let mut file = File::create(path.to_str().unwrap())?;
            file.write_all(code.as_bytes())?;
        }
    }

    Ok(())
}