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https://github.com/Llewellynvdm/exa.git
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7cb9a43541
Now it’s more like help. There aren’t any other fields in its struct at the moment, but there will be in the future (listing the features, and extremely colourful vanity mode)
105 lines
3.8 KiB
Rust
105 lines
3.8 KiB
Rust
use std::ffi::{OsStr, OsString};
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use std::fmt;
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use std::num::ParseIntError;
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use glob;
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use options::{HelpString, VersionString};
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use options::parser::{Arg, ParseError};
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/// A list of legal choices for an argument-taking option
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#[derive(PartialEq, Debug)]
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pub struct Choices(&'static [&'static str]);
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impl fmt::Display for Choices {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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write!(f, "(choices: {})", self.0.join(", "))
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}
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}
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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(ParseError),
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/// The user supplied an illegal choice to an Argument.
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BadArgument(&'static Arg, OsString, Choices),
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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(HelpString),
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/// The user wanted the version number.
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Version(VersionString),
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/// Two options were given that conflict with one another.
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Conflict(&'static Arg, &'static Arg),
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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 Arg, bool, &'static Arg),
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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 Arg, &'static Arg, &'static Arg),
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/// A very specific edge case where --tree can’t be used with --all twice.
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TreeAllAll,
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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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/// A glob ignore was given that failed to be parsed as a pattern.
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FailedGlobPattern(String),
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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 is_error(&self) -> bool {
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match *self {
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Misfire::Help(_) => false,
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Misfire::Version(_) => false,
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_ => true,
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}
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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: &'static Arg, otherwise: &OsStr, legal: &'static [&'static str]) -> Misfire {
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Misfire::BadArgument(option, otherwise.to_os_string(), Choices(legal))
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}
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}
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impl From<glob::PatternError> for Misfire {
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fn from(error: glob::PatternError) -> Misfire {
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Misfire::FailedGlobPattern(error.to_string())
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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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BadArgument(ref a, ref b, ref c) => write!(f, "Option {} has no value {:?} (Choices: {})", a, b, c),
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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(ref version) => write!(f, "{}", version),
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Conflict(ref a, ref b) => write!(f, "Option {} conflicts with option {}.", a, b),
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Useless(ref a, false, ref b) => write!(f, "Option {} is useless without option {}.", a, b),
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Useless(ref a, true, ref b) => write!(f, "Option {} is useless given option {}.", a, b),
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Useless2(ref a, ref b1, ref b2) => write!(f, "Option {} is useless without options {} or {}.", a, b1, b2),
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TreeAllAll => write!(f, "Option --tree is useless given --all --all."),
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FailedParse(ref e) => write!(f, "Failed to parse number: {}", e),
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FailedGlobPattern(ref e) => write!(f, "Failed to parse glob pattern: {}", e),
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}
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}
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}
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