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use std::fmt::Display;
use std::str::FromStr;
use clap::builder::PossibleValue;
use clap::ValueEnum;
/// Shell with auto-generated completion script available.
#[derive(Clone, Copy, Debug, Eq, Hash, PartialEq)]
#[non_exhaustive]
pub enum Shell {
/// Bourne Again SHell (bash)
Bash,
/// Friendly Interactive SHell (fish)
Fish,
}
impl Display for Shell {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
self.to_possible_value()
.expect("no values are skipped")
.get_name()
.fmt(f)
}
}
impl FromStr for Shell {
type Err = String;
fn from_str(s: &str) -> Result<Self, Self::Err> {
for variant in Self::value_variants() {
if variant.to_possible_value().unwrap().matches(s, false) {
return Ok(*variant);
}
}
Err(format!("invalid variant: {s}"))
}
}
// Hand-rolled so it can work even when `derive` feature is disabled
impl ValueEnum for Shell {
fn value_variants<'a>() -> &'a [Self] {
&[Shell::Bash, Shell::Fish]
}
fn to_possible_value<'a>(&self) -> Option<PossibleValue> {
Some(match self {
Shell::Bash => PossibleValue::new("bash"),
Shell::Fish => PossibleValue::new("fish"),
})
}
}
impl Shell {
fn completer(&self) -> &dyn crate::dynamic::Completer {
match self {
Self::Bash => &super::Bash,
Self::Fish => &super::Fish,
}
}
}
impl crate::dynamic::Completer for Shell {
fn file_name(&self, name: &str) -> String {
self.completer().file_name(name)
}
fn write_registration(
&self,
name: &str,
bin: &str,
completer: &str,
buf: &mut dyn std::io::Write,
) -> Result<(), std::io::Error> {
self.completer()
.write_registration(name, bin, completer, buf)
}
fn write_complete(
&self,
cmd: &mut clap::Command,
args: Vec<std::ffi::OsString>,
current_dir: Option<&std::path::Path>,
buf: &mut dyn std::io::Write,
) -> Result<(), std::io::Error> {
self.completer().write_complete(cmd, args, current_dir, buf)
}
}
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