initial commit

Signed-off-by: Amneesh Singh <natto@weirdnatto.in>

src/args.rs

@@ -0,0 +1,50 @@
+use std::env;
+use std::process::exit;
+
+const VERSION: &'static str = env!("CARGO_PKG_VERSION");
+const CRATE: &'static str = env!("CARGO_CRATE_NAME");
+
+#[derive(Default)]
+struct Options {
+    version: bool,
+    file: String,
+}
+
+// naive argument handling
+pub fn handle() -> String {
+    let args: Vec<String> = env::args().collect();
+
+    if args.len() < 2 {
+        println!("Usage: {} [-v] <file>", CRATE);
+        exit(0);
+    }
+
+    let mut options: Options = Default::default();
+
+    for arg in &args[1..] {
+        match arg.as_str() {
+            "-v" | "--version" => options.version = true,
+            flag if flag.chars().next() == Some('-') => panic!("option {} not implemented!", flag),
+            file @ _ => {
+                if !options.file.is_empty() {
+                    panic!("please specify only a single source file!");
+                }
+                options.file = file.to_string();
+            }
+        }
+    }
+
+    if options.version {
+        println!("{} version: {}", CRATE, VERSION);
+    }
+
+    if options.file.is_empty() {
+        if options.version {
+            exit(0);
+        } else {
+            panic!("no file supplied!");
+        }
+    }
+
+    options.file
+}

src/lib.rs

@@ -0,0 +1 @@
+pub mod args;

src/main.rs

@@ -0,0 +1,5 @@
+use tricc::args;
+
+fn main() {
+    println!("Hello World!");
+}