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Avoid an allocation when printing help text

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This commit is contained in:
Benjamin Sago 2017-06-23 22:50:29 +01:00
parent 4e32b7fca9
commit 4018165e26
3 changed files with 39 additions and 25 deletions
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50
src/options/help.rs
View File

@ -1,4 +1,4 @@
use getopts::Matches;
use std::fmt;
static OPTIONS: &str = r##"
@ -45,25 +45,31 @@ LONG VIEW OPTIONS
static GIT_HELP: &str = r##" --git list each file's Git status, if tracked"##;
static EXTENDED_HELP: &str = r##" -@, --extended list each file's extended attributes and sizes"##;
pub fn help_string(matches: &Matches, git: bool, xattr: bool) -> String {
let mut help = String::from("Usage:\n exa [options] [files...]\n");
if !matches.opt_present("long") {
help.push_str(OPTIONS);
}
help.push_str(LONG_OPTIONS);
if git {
help.push('\n');
help.push_str(GIT_HELP);
}
if xattr {
help.push('\n');
help.push_str(EXTENDED_HELP);
}
help
#[derive(PartialEq, Debug)]
pub struct HelpString {
pub only_long: bool,
pub git: bool,
pub xattrs: bool,
}
impl fmt::Display for HelpString {
fn fmt(&self, f: &mut fmt::Formatter) -> Result<(), fmt::Error> {
try!(write!(f, "Usage:\n exa [options] [files...]\n"));
if !self.only_long {
try!(write!(f, "{}", OPTIONS));
}
try!(write!(f, "{}", LONG_OPTIONS));
if self.git {
try!(write!(f, "\n{}", GIT_HELP));
}
if self.xattrs {
try!(write!(f, "\n{}", EXTENDED_HELP));
}
Ok(())
}
}

4
src/options/misfire.rs
View File

@ -4,6 +4,8 @@ use std::num::ParseIntError;
use getopts;
use glob;
use options::help::HelpString;
/// A list of legal choices for an argument-taking option
#[derive(PartialEq, Debug)]
@ -28,7 +30,7 @@ pub enum Misfire {
/// The user asked for help. This isn’t strictly an error, which is why
/// this enum isn’t named Error!
Help(String),
Help(HelpString),
/// The user wanted the version number.
Version,

10
src/options/mod.rs
View File

@ -12,7 +12,7 @@ mod filter;
pub use self::filter::{FileFilter, SortField, SortCase};
mod help;
use self::help::help_string;
use self::help::HelpString;
mod misfire;
pub use self::misfire::Misfire;
@ -103,7 +103,13 @@ impl Options {
};
if matches.opt_present("help") {
return Err(Misfire::Help(help_string(&matches, cfg!(feature="git"), xattr::ENABLED)));
let help = HelpString {
only_long: matches.opt_present("long"),
git: cfg!(feature="git"),
xattrs: xattr::ENABLED,
};
return Err(Misfire::Help(help));
}
else if matches.opt_present("version") {
return Err(Misfire::Version);