aboutsummaryrefslogtreecommitdiff
path: root/crates/proc_macro_srv/src/cli.rs
blob: d428b956753157b327a8e9f08578a6c8abea59fb (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
//! Driver for proc macro server

use crate::ProcMacroSrv;
use proc_macro_api::msg::{self, Message};
use std::io;

pub fn run() -> io::Result<()> {
    let mut srv = ProcMacroSrv::default();

    while let Some(req) = read_request()? {
        let res = match req {
            msg::Request::ListMacro(task) => srv.list_macros(&task).map(msg::Response::ListMacro),
            msg::Request::ExpansionMacro(task) => {
                srv.expand(&task).map(msg::Response::ExpansionMacro)
            }
        };

        let msg = res.unwrap_or_else(|err| {
            msg::Response::Error(msg::ResponseError {
                code: msg::ErrorCode::ExpansionError,
                message: err,
            })
        });

        if let Err(err) = write_response(msg) {
            eprintln!("Write message error: {}", err);
        }
    }

    Ok(())
}

fn read_request() -> io::Result<Option<msg::Request>> {
    msg::Request::read(&mut io::stdin().lock())
}

fn write_response(msg: msg::Response) -> io::Result<()> {
    msg.write(&mut io::stdout().lock())
}