rst_lex 0.0.111

Simple lexer for Rust
Documentation 
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//build.rs for rst_lex

use std::env;
use std::fs;
use std::path::Path;
use std::io::{Read, Write};
//extern crate for_build_rs;
#[cfg(feature ="cleanup")]
use for_build_rs::lex::{stream_cleanup, leave_file_mark};
#[cfg(feature ="cleanup")]
use for_build_rs::faav::cleanup_dbg_attr;
#[cfg(feature ="cleanup")]
pub fn cleanup () {
    let mut attr = cleanup_dbg_attr::new();
    attr._1st_token = "dbg!".to_string ();
    attr.end_token = ";".to_string ();
    let src = "./src/dev_lex.rs";
    let dst = "./src/stable_lex.rs";
    let mut dev_lex = String::new ();
    let mut src_file = match fs::File::open (src) {
        Ok (f) => { f },
        Err (e) => {panic! ("cleanup for rst_lex failed to open file {src} w/ err {:?}", e)}
    };
    let _ = match src_file.read_to_string ( &mut dev_lex){
        Ok (fine) => { fine },
        Err (e) => { eprintln! ("cleanup () in rst_lex build.rs failed to read from {src} to dev_lex due to {:?} ", e); return}
    };
    dev_lex = stream_cleanup (&dev_lex, &attr._1st_token, 0, &attr.end_token);
    dev_lex = stream_cleanup (&dev_lex, &"dbg_stuff".to_string(), 0, &"dbg_stuff".to_string() );
    let mut dst_file = match fs::File::create (dst) {
        Ok (f) => { f },
        Err (e) => {panic! ("cleanup for rst_lex failed to wtite file {dst} w/ err {:?}", e)}
    };
    dev_lex = dev_lex.replace (";;", "");
    leave_file_mark ("/tmp/cleanup", &dev_lex);
    dst_file.write_all (dev_lex.as_bytes() );
}
fn main() {
    #[cfg(feature ="cleanup")]
    cleanup ();
}