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|
mod encoded_string;
mod error;
mod flags;
mod main_result;
use std::{
collections::HashSet,
env,
fs,
hash::Hash,
io::{self, BufRead, BufReader, Write},
path::Path,
process::{Command, Stdio}
};
use {
encoded_string::EncodedString,
error::Error,
main_result::MainResult
};
use {
flags::Flags,
getopt::{Opt, Parser},
itertools::Itertools,
tempfile::{Builder, NamedTempFile, TempDir}
};
fn main() -> MainResult {
work().into()
}
fn work() -> Result<(), Error> {
let mut argv = env::args().collect::<Vec<String>>();
let mut flags = Flags { ..Default::default() };
let mut opts = Parser::new(&argv, ":0ei");
loop {
match opts.next().transpose() {
Ok(v) => match v {
None => break,
Some(opt) => match opt {
Opt('0', None) => flags.nul = true,
Opt('e', None) => flags.encode = true,
Opt('i', None) => flags.individual = true,
_ => { return Err(Error::BadArgs); }
}
},
Err(_) => { return Err(Error::BadArgs); }
}
}
let rest = argv.split_off(opts.index());
let cmd = rest.get(0).ok_or(Error::BadArgs)?;
let args = &rest[1..];
let mut old_files: Vec<_> = io::stdin()
.lines()
.collect::<Result<_, _>>()
.unwrap();
if old_files.iter().any(|s| s.is_empty()) {
return Err(Error::BadArgs);
}
if flags.encode {
old_files = old_files.iter().map(move |s| encode_string(s)).collect();
}
let dups = duplicate_elements(old_files.clone());
if !dups.is_empty() {
return Err(Error::DupInputElems(dups));
}
let mut child = Command::new(cmd)
.args(args)
.stdin(Stdio::piped())
.stdout(Stdio::piped())
.spawn()
.map_err(|e| Error::SpawnFailed(cmd.to_owned(), e))?;
{
let mut stdin = child.stdin.take().expect("Failed to open stdin");
old_files.iter().try_for_each(|f| writeln!(stdin, "{f}"))?;
}
let output = child.wait_with_output()?;
if !output.status.success() {
return Err(Error::Nop);
}
let new_files = String::from_utf8(output.stdout)?
.lines()
.map(|s| if flags.encode {
decode_string(s)
} else {
s.to_string()
})
.collect::<Vec<String>>();
if old_files.len() != new_files.len() {
return Err(Error::BadLengths);
}
let dups = duplicate_elements(new_files.iter().cloned().collect::<Vec<_>>());
if !dups.is_empty() {
return Err(Error::DupOutputElems(dups));
}
let tmpdir = Builder::new().prefix("mmv").tempdir()?;
let mut conflicts = Vec::<&str>::new();
old_files
.iter()
.zip(new_files.iter())
.filter(|(x, y)| x != y)
.try_for_each(|(x, y)| try_move(&mut conflicts, &tmpdir, x, y))?;
conflicts
.iter()
.try_for_each(|c| do_move(&tmpdir, c))?;
Ok(())
}
fn duplicate_elements<T>(iter: T) -> Vec<T::Item>
where
T: IntoIterator,
T::Item: Clone + Eq + Hash
{
let mut uniq = HashSet::new();
iter
.into_iter()
.filter(|x| !uniq.insert(x.clone()))
.unique()
.collect::<Vec<_>>()
}
fn encode_string(s: &str) -> String {
let mut n = String::new();
s.chars().for_each(|c| match c {
'\\' => n.push_str("\\\\"),
'\n' => n.push_str("\\n"),
_ => n.push(c)
});
n
}
fn decode_string(s: &str) -> String {
(EncodedString { s: s.bytes() }).decode()
}
fn decode_from_file(tmpfile: &NamedTempFile) -> Result<Vec<String>, io::Error> {
BufReader::new(tmpfile)
.lines()
.map(|r| match r {
Ok(s) => {
let es = EncodedString { s: s.bytes() };
Ok(es.decode())
},
Err(_) => r
})
.filter(|r| match r {
Ok(s) => !s.is_empty(),
_ => true
})
.collect::<Result<Vec<String>, _>>()
}
fn try_move<'a>(
conflicts: &mut Vec<&'a str>,
tmpdir: &TempDir,
old: &str,
new: &'a str
) -> Result<(), io::Error> {
if Path::new(new).exists() {
let new_loc = tmpdir.path().to_str().unwrap().to_owned() + "/" + new;
fs::rename(old, new_loc)?;
conflicts.push(new);
} else {
fs::rename(old, new)?;
}
Ok(())
}
fn do_move(tmpdir: &TempDir, new: &str) -> Result<(), io::Error> {
let old = tmpdir.path().to_str().unwrap().to_owned() + "/" + new;
fs::rename(old, new)?;
Ok(())
}
|
