Add command line parsing

src/servo/opts.rs

@@ -0,0 +1,47 @@
+#[doc = "
+
+Configuration options for a single run of the servo application. Created
+from command line arguments.
+
+"];
+
+type opts = {
+    urls: [str],
+    render_mode: render_mode
+};
+
+enum render_mode {
+    screen,
+    file(str)
+}
+
+fn from_cmdline_args(args: [str]) -> opts {
+    import std::getopts;
+
+    let args = args.tail();
+
+    let opts = [
+        getopts::optopt("o")
+    ];
+
+    let match = alt getopts::getopts(args, opts) {
+      result::ok(m) { m }
+      result::err(f) { fail getopts::fail_str(f) }
+    };
+
+    let urls = if match.free.is_empty() {
+        fail "servo asks that you provide 1 or more URLs"
+    } else {
+        match.free
+    };
+
+    let render_mode = alt getopts::opt_maybe_str(match, "o") {
+      some(output_file) { file(output_file) }
+      none { screen }
+    };
+
+    {
+        urls: urls,
+        render_mode: render_mode
+    }
+}

src/servo/servo.rc

@@ -49,3 +49,4 @@ mod util {
 }
 
 mod content;
+mod opts;

src/servo/servo.rs

@@ -6,6 +6,11 @@ import gfx::renderer;
 import platform::osmain;
 
 fn main(args: [str]) {
+    run(opts::from_cmdline_args(args))
+}
+
+fn run(opts: opts::opts) {
+
     // The platform event handler thread
     let osmain = osmain::osmain();
 
@@ -23,7 +28,7 @@ fn main(args: [str]) {
     let content = content::content(layout);
 
     // Send each file to render then wait for keypress
-    for args.tail().each { |filename|
+    for opts.urls.each { |filename|
         #debug["master: Sending filename `%s`", filename];
         content.send(content::parse(filename));
         #debug["master: Waiting for keypress"];