1 // Copyright 2014 The Rust Project Developers. See the COPYRIGHT
2 // file at the top-level directory of this distribution and at
3 // http://rust-lang.org/COPYRIGHT.
5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
8 // option. This file may not be copied, modified, or distributed
9 // except according to those terms.
11 //! Common API for all rustbook subcommands.
14 use error::CommandResult;
22 pub trait Subcommand {
23 /// Mutate the subcommand by parsing its arguments.
25 /// Returns `Err` on a parsing error.
26 fn parse_args(&mut self, args: &[String]) -> CliResult<()>;
27 /// Print the CLI usage information.
29 /// Actually execute the subcommand.
30 fn execute(&mut self, term: &mut Term) -> CommandResult<()>;
33 /// Create a Subcommand object based on its name.
34 pub fn parse_name(name: &str) -> Option<Box<Subcommand>> {
35 let cmds: [fn(&str) -> Option<Box<Subcommand>>; 4] = [help::parse_cmd,
40 let parsed = (*parser)(name);
41 if parsed.is_some() { return parsed }