95d904625b
This commit deprecates the majority of std::old_io::fs in favor of std::fs and its new functionality. Some functions remain non-deprecated but are now behind a feature gate called `old_fs`. These functions will be deprecated once suitable replacements have been implemented. The compiler has been migrated to new `std::fs` and `std::path` APIs where appropriate as part of this change.
47 lines
1.4 KiB
Rust
47 lines
1.4 KiB
Rust
// Copyright 2014 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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//! Implementation of the `help` subcommand. Currently just prints basic usage info.
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use subcommand::Subcommand;
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use error::CliResult;
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use error::CommandResult;
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use term::Term;
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struct Help;
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pub fn parse_cmd(name: &str) -> Option<Box<Subcommand>> {
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match name {
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"help" | "--help" | "-h" | "-?" => Some(Box::new(Help)),
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_ => None
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}
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}
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impl Subcommand for Help {
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fn parse_args(&mut self, _: &[String]) -> CliResult<()> {
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Ok(())
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}
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fn usage(&self) {}
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fn execute(&mut self, _: &mut Term) -> CommandResult<()> {
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usage();
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Ok(())
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}
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}
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pub fn usage() {
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println!("Usage: rust-book <command> [<args>]");
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println!("");
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println!("The <command> must be one of:");
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println!(" help Print this message.");
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println!(" build Build the book in subdirectory _book");
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println!(" serve --NOT YET IMPLEMENTED--");
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println!(" test --NOT YET IMPLEMENTED--");
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}
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