Add structopt for arg parsing

Signed-off-by: Alek Ratzloff <alekratz@gmail.com>

Cargo.lock

@@ -8,6 +8,24 @@ dependencies = [
  "memchr 2.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "ansi_term"
+version = "0.11.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "winapi 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "atty"
+version = "0.2.14"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "hermit-abi 0.1.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.66 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "autocfg"
 version = "1.0.0"
@@ -99,6 +117,20 @@ dependencies = [
  "time 0.1.42 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "clap"
+version = "2.33.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "ansi_term 0.11.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "atty 0.2.14 (registry+https://github.com/rust-lang/crates.io-index)",
+ "bitflags 1.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "strsim 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "textwrap 0.11.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "unicode-width 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",
+ "vec_map 0.8.1 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "crossbeam-channel"
 version = "0.4.2"
@@ -179,6 +211,22 @@ dependencies = [
  "regex 1.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "heck"
+version = "0.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "unicode-segmentation 1.6.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "hermit-abi"
+version = "0.1.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "libc 0.2.66 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "ignore"
 version = "0.4.11"
@@ -380,6 +428,7 @@ dependencies = [
  "regex 1.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "rerun_except 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "snafu 0.6.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "structopt 0.3.9 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -540,6 +589,33 @@ name = "static_assertions"
 version = "1.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "strsim"
+version = "0.8.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
+name = "structopt"
+version = "0.3.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "clap 2.33.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "lazy_static 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "structopt-derive 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "structopt-derive"
+version = "0.4.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "heck 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proc-macro-error 0.4.9 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proc-macro2 1.0.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "quote 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 1.0.14 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "syn"
 version = "1.0.14"
@@ -560,6 +636,14 @@ dependencies = [
  "syn 1.0.14 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "textwrap"
+version = "0.11.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "unicode-width 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "thread_local"
 version = "1.0.1"
@@ -603,6 +687,11 @@ dependencies = [
  "syn 1.0.14 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "unicode-segmentation"
+version = "1.6.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "unicode-width"
 version = "0.1.7"
@@ -613,6 +702,11 @@ name = "unicode-xid"
 version = "0.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "vec_map"
+version = "0.8.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "vergen"
 version = "2.1.3"
@@ -678,6 +772,8 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
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@@ -690,6 +786,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 "checksum cfg-if 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)" = "4785bdd1c96b2a846b2bd7cc02e86b6b3dbf14e7e53446c4f54c92a361040822"
 "checksum cfgrammar 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)" = "38ba3189f7cc6ccd37f6ce141b6c5a2670cbe8191ce12e937c24871cf26fd1be"
 "checksum chrono 0.4.10 (registry+https://github.com/rust-lang/crates.io-index)" = "31850b4a4d6bae316f7a09e691c944c28299298837edc0a03f755618c23cbc01"
+"checksum clap 2.33.0 (registry+https://github.com/rust-lang/crates.io-index)" = "5067f5bb2d80ef5d68b4c87db81601f0b75bca627bc2ef76b141d7b846a3c6d9"
 "checksum crossbeam-channel 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)" = "cced8691919c02aac3cb0a1bc2e9b73d89e832bf9a06fc579d4e71b68a2da061"
 "checksum crossbeam-utils 0.7.2 (registry+https://github.com/rust-lang/crates.io-index)" = "c3c7c73a2d1e9fc0886a08b93e98eb643461230d5f1925e4036204d5f2e261a8"
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@@ -699,6 +796,8 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 "checksum getopts 0.2.21 (registry+https://github.com/rust-lang/crates.io-index)" = "14dbbfd5c71d70241ecf9e6f13737f7b5ce823821063188d7e46c41d371eebd5"
 "checksum getset 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "f62a139c59ae846c3964c392f12aac68f1997d1a40e9d3b40a89a4ab553e04a0"
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+"checksum heck 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)" = "20564e78d53d2bb135c343b3f47714a56af2061f1c928fdb541dc7b9fdd94205"
+"checksum hermit-abi 0.1.8 (registry+https://github.com/rust-lang/crates.io-index)" = "1010591b26bbfe835e9faeabeb11866061cc7dcebffd56ad7d0942d0e61aefd8"
 "checksum ignore 0.4.11 (registry+https://github.com/rust-lang/crates.io-index)" = "522daefc3b69036f80c7d2990b28ff9e0471c683bad05ca258e0a01dd22c5a1e"
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@@ -738,15 +837,21 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 "checksum snafu-derive 0.6.2 (registry+https://github.com/rust-lang/crates.io-index)" = "bdc75da2e0323f297402fd9c8fdba709bb04e4c627cbe31d19a2c91fc8d9f0e2"
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Cargo.toml

@@ -9,6 +9,7 @@ build = "build.rs"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
+structopt = "0.3"
 bitflags = "1"
 byteorder = "1"
 lazy_static = "1"

src/main.rs

@@ -3,21 +3,21 @@
 mod common;
 mod vm;
 
-use std::{env, fs, io, process};
+use structopt::StructOpt;
+use std::{fs, io, process, path::{Path, PathBuf}};
+
+#[derive(StructOpt, Debug)]
+struct Options {
+    // maybe some other options:
+    // * debug
+    #[structopt(name = "FILE", parse(from_os_str))]
+    input: PathBuf,
+}
 
 type Result<T> = std::result::Result<T, Box<dyn std::error::Error>>;
 
-fn get_input_string() -> io::Result<String> {
+fn get_input_string(path: impl AsRef<Path>) -> io::Result<String> {
-    let args: Vec<String> = env::args().collect();
+    fs::read_to_string(path.as_ref())
-    if args.len() <= 1 {
-        println!(
-            "usage: {} file.asm",
-            args.get(0).map(String::as_str).unwrap_or("rasp")
-        );
-        process::exit(1);
-    } else {
-        fs::read_to_string(&args[1])
-    }
 }
 
 fn main() -> Result<()> {
@@ -28,7 +28,8 @@ fn main() -> Result<()> {
             syn::{lexer, parser},
         }
     };
-    let text = get_input_string()?;
+    let opt = Options::from_args();
+    let text = get_input_string(&opt.input)?;
     let lexerdef = lexer::lexerdef();
     let lexer = lexerdef.lexer(&text);
     let (res, errors) = parser::parse(&lexer);