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auto merge of #1277 : Adenilson/servo/implementingHelp, r=pcwalton

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Executing servo browser for the first time doesn't make evident that it already supports several different flags.

This patch implements a help message displaying the available options and a brief explanation on them, based on comments in source code (opts.rs).

I implemented both short hand/long hand options using getopts::groups.
This commit is contained in:
bors-servo 2013-11-18 15:58:28 -08:00
commit 1dd80b9a6c
1 changed files with 25 additions and 10 deletions
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35
src/components/gfx/opts.rs
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@ -7,7 +7,7 @@
use azure::azure_hl::{BackendType, CairoBackend, CoreGraphicsBackend};
use azure::azure_hl::{CoreGraphicsAcceleratedBackend, Direct2DBackend, SkiaBackend};
use extra::getopts;
use extra::getopts::groups;
/// Global flags for Servo, currently set on the command line.
#[deriving(Clone)]
@ -41,26 +41,41 @@ pub struct Opts {
headless: bool,
}
fn print_usage(app: &str, opts: &[groups::OptGroup]) {
let message = format!("Usage: {} [ options ... ] [URL]\n\twhere options include", app);
println(groups::usage(message, opts));
}
pub fn from_cmdline_args(args: &[~str]) -> Opts {
let app_name = args[0].to_str();
let args = args.tail();
let opts = ~[
getopts::optflag("c"), // CPU rendering
getopts::optopt("o"), // output file
getopts::optopt("r"), // rendering backend
getopts::optopt("s"), // size of tiles
getopts::optopt("t"), // threads to render with
getopts::optflagopt("p"), // profiler flag and output interval
getopts::optflag("x"), // exit after load flag
getopts::optflag("z"), // headless mode
groups::optflag("c", "cpu", "CPU rendering"),
groups::optopt("o", "output", "Output file", "output.png"),
groups::optopt("r", "rendering", "Rendering backend", "direct2d|core-graphics|core-graphics-accelerated|cairo|skia."),
groups::optopt("s", "size", "Size of tiles", "512"),
groups::optopt("t", "threads", "Number of render threads", "1"),
groups::optflagopt("p", "profile", "Profiler flag and output interval", "10"),
groups::optflag("x", "exit", "Exit after load flag"),
groups::optflag("z", "headless", "Headless mode"),
groups::optflag("h", "help", "Print this message")
];
let opt_match = match getopts::getopts(args, opts) {
let opt_match = match groups::getopts(args, opts) {
Ok(m) => m,
Err(f) => fail!(f.to_err_msg()),
};
if opt_match.opt_present("h") || opt_match.opt_present("help") {
print_usage(app_name, opts);
// TODO: how to return a null struct and let the caller know that
// it should abort?
fail!("")
};
let urls = if opt_match.free.is_empty() {
print_usage(app_name, opts);
fail!(~"servo asks that you provide 1 or more URLs")
} else {
opt_match.free.clone()