mirror of
https://github.com/Llewellynvdm/exa.git
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70 lines
2.5 KiB
Rust
70 lines
2.5 KiB
Rust
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use std::fmt;
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use std::num::ParseIntError;
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use getopts;
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/// A **misfire** is a thing that can happen instead of listing files -- a
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/// catch-all for anything outside the program’s normal execution.
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#[derive(PartialEq, Debug)]
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pub enum Misfire {
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/// The getopts crate didn’t like these arguments.
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InvalidOptions(getopts::Fail),
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/// The user asked for help. This isn’t strictly an error, which is why
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/// this enum isn’t named Error!
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Help(String),
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/// The user wanted the version number.
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Version,
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/// Two options were given that conflict with one another.
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Conflict(&'static str, &'static str),
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/// An option was given that does nothing when another one either is or
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/// isn't present.
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Useless(&'static str, bool, &'static str),
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/// An option was given that does nothing when either of two other options
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/// are not present.
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Useless2(&'static str, &'static str, &'static str),
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/// A numeric option was given that failed to be parsed as a number.
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FailedParse(ParseIntError),
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}
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impl Misfire {
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/// The OS return code this misfire should signify.
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pub fn error_code(&self) -> i32 {
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if let Misfire::Help(_) = *self { 2 }
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else { 3 }
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}
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/// The Misfire that happens when an option gets given the wrong
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/// argument. This has to use one of the `getopts` failure
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/// variants--it’s meant to take just an option name, rather than an
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/// option *and* an argument, but it works just as well.
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pub fn bad_argument(option: &str, otherwise: &str) -> Misfire {
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Misfire::InvalidOptions(getopts::Fail::UnrecognizedOption(format!("--{} {}", option, otherwise)))
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}
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}
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impl fmt::Display for Misfire {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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use self::Misfire::*;
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match *self {
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InvalidOptions(ref e) => write!(f, "{}", e),
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Help(ref text) => write!(f, "{}", text),
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Version => write!(f, "exa {}", env!("CARGO_PKG_VERSION")),
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Conflict(a, b) => write!(f, "Option --{} conflicts with option {}.", a, b),
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Useless(a, false, b) => write!(f, "Option --{} is useless without option --{}.", a, b),
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Useless(a, true, b) => write!(f, "Option --{} is useless given option --{}.", a, b),
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Useless2(a, b1, b2) => write!(f, "Option --{} is useless without options --{} or --{}.", a, b1, b2),
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FailedParse(ref e) => write!(f, "Failed to parse number: {}", e),
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}
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}
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}
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