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|
// shell-complete.rs
// Copyright (C) 2020 The Nitrocli Developers
// SPDX-License-Identifier: GPL-3.0-or-later
use std::io;
use structopt::clap;
use structopt::StructOpt as _;
#[allow(unused)]
mod nitrocli {
include!("../src/arg_util.rs");
// We only need a stripped down version of the `Command` macro.
macro_rules! Command {
( $(#[$docs:meta])* $name:ident, [
$( $(#[$doc:meta])* $var:ident$(($inner:ty))? => $exec:expr, ) *
] ) => {
$(#[$docs])*
#[derive(Debug, PartialEq, structopt::StructOpt)]
pub enum $name {
$(
$(#[$doc])*
$var$(($inner))?,
)*
}
};
}
include!("../src/args.rs");
}
/// Generate a bash completion script for nitrocli.
///
/// The script will be emitted to standard output.
#[derive(Debug, structopt::StructOpt)]
pub struct Args {
/// The command for which to generate the bash completion script.
#[structopt(default_value = "nitrocli")]
pub command: String,
}
fn generate_bash<W>(command: &str, output: &mut W)
where
W: io::Write,
{
let mut app = nitrocli::Args::clap();
app.gen_completions_to(command, clap::Shell::Bash, output);
}
fn main() {
let args = Args::from_args();
generate_bash(&args.command, &mut io::stdout())
}
#[cfg(test)]
mod tests {
use super::*;
use std::io;
use std::ops::Add as _;
use std::process;
/// Separate the given words by newlines.
fn lines<'w, W>(mut words: W) -> String
where
W: Iterator<Item = &'w str>,
{
let first = words.next().unwrap_or("");
words
.fold(first.to_string(), |words, word| {
format!("{}\n{}", words, word)
})
.add("\n")
}
/// Check if `bash` is present on the system.
fn has_bash() -> bool {
match process::Command::new("bash").arg("-c").arg("exit").spawn() {
// We deliberately only indicate that bash does not exist if we
// get a file-not-found error. We don't expect any other error but
// should there be one things will blow up later.
Err(ref err) if err.kind() == io::ErrorKind::NotFound => false,
_ => true,
}
}
/// Perform a bash completion of the given arguments to nitrocli.
fn complete_bash<'w, W>(words: W) -> Vec<u8>
where
W: ExactSizeIterator<Item = &'w str>,
{
let mut buffer = Vec::new();
generate_bash("nitrocli", &mut buffer);
let script = String::from_utf8(buffer).unwrap();
let command = format!(
"
set -e;
eval '{script}';
export COMP_WORDS=({words});
export COMP_CWORD={index};
_nitrocli;
echo -n ${{COMPREPLY}}
",
index = words.len(),
words = lines(Some("nitrocli").into_iter().chain(words)),
script = script
);
let output = process::Command::new("bash")
.arg("-c")
.arg(command)
.output()
.unwrap();
output.stdout
}
#[test]
fn array_lines() {
assert_eq!(&lines(vec![].into_iter()), "\n");
assert_eq!(&lines(vec!["first"].into_iter()), "first\n");
assert_eq!(
&lines(vec!["first", "second"].into_iter()),
"first\nsecond\n"
);
assert_eq!(
&lines(vec!["first", "second", "third"].into_iter()),
"first\nsecond\nthird\n"
);
}
#[test]
fn complete_all_the_things() {
if !has_bash() {
return;
}
assert_eq!(complete_bash(vec!["stat"].into_iter()), b"status");
assert_eq!(
complete_bash(vec!["status", "--ver"].into_iter()),
b"--version"
);
assert_eq!(complete_bash(vec!["--version"].into_iter()), b"--version");
assert_eq!(complete_bash(vec!["--model", "s"].into_iter()), b"storage");
assert_eq!(
complete_bash(vec!["otp", "get", "--model", "p"].into_iter()),
b"pro"
);
}
}
|
