refactor main

src/main.rs

@@ -3,14 +3,29 @@ mod parser;
 mod rtlil;
 
 use nom::error::{convert_error, VerboseError};
+use std::path::PathBuf;
+use std::fs::File;
+use std::io::prelude::*;
 use structopt::StructOpt;
 
+#[derive(Debug, StructOpt)]
+#[structopt(name = "example", about = "An example of StructOpt usage.")]
+struct Opt {
+    /// Input file
+    #[structopt(parse(from_os_str))]
+    input: PathBuf,
+}
+
 // custom IResult type for verboseerror
 pub type IResult<I, O, E = VerboseError<I>> = nom::IResult<I, O, E>;
 
 fn main() {
-    let input = include_str!("../identity.fut");
-    let parsed = parser::module(input);
+    let opt = Opt::from_args();
+    let mut infile = File::open(opt.input).expect("could not open file");
+    let mut input = String::new();
+    infile.read_to_string(&mut input).expect("error reading file");
+    let input: &str = input.as_str();
+    let parsed = parser::parse(&input);
     match parsed {
         Err(nom::Err::Error(err) | nom::Err::Failure(err)) => {
             print!("{}", convert_error(input, err))

src/parser.rs

@@ -204,6 +204,10 @@ pub fn module(input: &str) -> IResult<&str, Module> {
     )(input)
 }
 
+fn parse(input: &str) -> IResult<&str, Module> {
+    module(input)
+}
+
 #[cfg(test)]
 mod test {
     use super::*;