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use std::{ops::Deref, process::Command};
pub struct Targets(Vec<u8>);
impl Targets {
pub fn iter(&self) -> Result<TargetsIter, std::str::Utf8Error> {
std::str::from_utf8(&self.0)
.map(str::lines)
.map(TargetsIter)
}
pub fn collect_strs(&self) -> Result<CollectedTargetsStrs, std::str::Utf8Error> {
std::str::from_utf8(&self.0)
.map(str::lines)
.map(|targets| targets.collect())
.map(CollectedTargetsStrs::from_vec)
}
}
pub struct TargetsIter<'a>(std::str::Lines<'a>);
impl<'a> Iterator for TargetsIter<'a> {
type Item = &'a str;
fn next(&mut self) -> Option<Self::Item> {
self.0.next()
}
}
pub struct CollectedTargetsStrs<'a>(Vec<&'a str>);
impl<'a> CollectedTargetsStrs<'a> {
fn from_vec(vec: Vec<&'a str>) -> Self {
#[cfg(debug_assertions)]
for window in vec.windows(2) {
assert!(
window[0] < window[1],
"The targets from `go tool dist list` were expected to be sorted lexicographically."
);
}
Self(vec)
}
}
impl<'a> CollectedTargetsStrs<'a> {
pub fn contains(&self, target: &str) -> bool {
self.0.binary_search(&target).is_ok()
}
}
impl<'a> Deref for CollectedTargetsStrs<'a> {
type Target = [&'a str];
fn deref(&self) -> &Self::Target {
self.0.as_slice()
}
}
#[doc = include_str!("../examples/targets.rs")]
pub fn from_cli() -> Result<Targets, std::io::Error> {
let output = Command::new("go")
.arg("tool")
.arg("dist")
.arg("list")
.output()?;
Ok(Targets(output.stdout))
}