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use {
super::{
argparse::{Arguments, Mode},
types::Die,
udiff::DiffRange,
},
futures::{
future::{ready, Either},
stream::{once, try_unfold, Stream, TryStreamExt},
},
regex::Regex,
std::{
collections::HashSet,
ffi::OsString,
io::{self, ErrorKind, IsTerminal},
path::{Path, PathBuf},
},
tokio::{
fs::{canonicalize, File},
io::{stdin, AsyncBufReadExt, BufReader},
},
};
#[derive(Debug)]
pub enum RowIn {
Entire(PathBuf),
Piecewise(PathBuf, HashSet<DiffRange>),
}
#[derive(Debug)]
struct DiffRow(PathBuf, DiffRange);
fn p_row(row: &str) -> Result<DiffRow, Die> {
let f = || Die::ArgumentError(String::new());
let ff = |_| f();
let preg = "\n\n\n\n@@ -(\\d+),(\\d+) \\+(\\d+),(\\d+) @@$";
let re = Regex::new(preg).map_err(Die::RegexError)?;
let captures = re.captures(row).ok_or_else(f)?;
let before_start = captures
.get(1)
.ok_or_else(f)?
.as_str()
.parse::<usize>()
.map_err(ff)?;
let before_inc = captures
.get(2)
.ok_or_else(f)?
.as_str()
.parse::<usize>()
.map_err(ff)?;
let after_start = captures
.get(3)
.ok_or_else(f)?
.as_str()
.parse::<usize>()
.map_err(ff)?;
let after_inc = captures
.get(4)
.ok_or_else(f)?
.as_str()
.parse::<usize>()
.map_err(ff)?;
let range = DiffRange {
before: (before_start - 1, before_inc),
after: (after_start - 1, after_inc),
};
let path = PathBuf::from(String::from(re.replace(row, "")));
Ok(DiffRow(path, range))
}
async fn stream_patch(patches: &Path) -> impl Stream<Item = Result<RowIn, Die>> {
let patches = patches.to_owned();
let fd = match File::open(&patches).await {
Err(e) => {
let err = Die::IO(patches.clone(), e.kind());
return Either::Left(once(ready(Err(err))));
}
Ok(fd) => fd,
};
let reader = BufReader::new(fd).split(b'\0');
let acc = HashSet::new();
let stream = try_unfold(
(reader, patches, PathBuf::new(), acc),
move |mut s| async move {
let next = s
.0
.next_segment()
.await
.map_err(|e| Die::IO(s.1.clone(), e.kind()))?;
match next {
None if s.3.is_empty() => Ok(None),
None => {
let path = s.2;
let ranges = s.3;
s.2 = PathBuf::new();
s.3 = HashSet::new();
Ok(Some((Some(RowIn::Piecewise(path, ranges)), s)))
}
Some(buf) => {
let row =
String::from_utf8(buf).map_err(|_| Die::IO(s.1.clone(), ErrorKind::InvalidData))?;
let parsed = p_row(&row)?;
if parsed.0 == s.2 {
s.3.insert(parsed.1);
Ok(Some((None, s)))
} else {
let path = s.2;
let ranges = s.3;
s.2 = parsed.0;
s.3 = HashSet::new();
s.3.insert(parsed.1);
if ranges.is_empty() {
Ok(Some((None, s)))
} else {
Ok(Some((Some(RowIn::Piecewise(path, ranges)), s)))
}
}
}
}
},
);
Either::Right(stream.try_filter_map(|x| ready(Ok(x))))
}
fn u8_pathbuf(v8: Vec<u8>) -> PathBuf {
#[cfg(target_family = "unix")]
{
use std::os::unix::ffi::OsStringExt;
PathBuf::from(OsString::from_vec(v8))
}
#[cfg(target_family = "windows")]
{
use std::os::windows::ffi::OsStringExt;
let mut buf = Vec::new();
for chunk in v8.chunks_exact(2) {
let c: [u8; 2] = chunk.try_into().expect("exact chunks");
let b = u16::from_ne_bytes(c);
buf.push(b)
}
PathBuf::from(OsString::from_wide(&buf))
}
}
fn stream_stdin(use_nul: bool) -> impl Stream<Item = Result<RowIn, Die>> {
if io::stdin().is_terminal() {
let err = Die::ArgumentError("/dev/stdin connected to tty".to_owned());
return Either::Left(once(ready(Err(err))));
}
let delim = if use_nul { b'\0' } else { b'\n' };
let reader = BufReader::new(stdin()).split(delim);
let seen = HashSet::new();
let stream = try_unfold((reader, seen), |mut s| async {
let next = s
.0
.next_segment()
.await
.map_err(|e| Die::IO(PathBuf::from("/dev/stdin"), e.kind()))?;
match next {
None => Ok(None),
Some(buf) => {
let path = u8_pathbuf(buf);
match canonicalize(&path).await {
Err(e) if e.kind() == ErrorKind::NotFound => Ok(Some((None, s))),
Err(e) => Err(Die::IO(path, e.kind())),
Ok(canonical) => Ok(Some({
if s.1.insert(canonical.clone()) {
(Some(RowIn::Entire(canonical)), s)
} else {
(None, s)
}
})),
}
}
}
});
Either::Right(stream.try_filter_map(|x| ready(Ok(x))))
}
pub async fn stream_in(mode: &Mode, args: &Arguments) -> impl Stream<Item = Result<RowIn, Die>> {
match mode {
Mode::Initial => Either::Left(stream_stdin(args.read0)),
Mode::Preview(path) | Mode::Patch(path) => Either::Right(stream_patch(path).await),
}
}
|
