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Skye 2024-11-11 18:59:04 -05:00
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/target

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Cargo.toml Normal file
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[package]
name = "subtitle-merge"
version = "0.1.0"
edition = "2021"
[dependencies]
clap = { version = "4.5.20", features = ["derive"] }
itertools = "0.13.0"

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src/main.rs Normal file
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use std::{
ffi::{OsStr, OsString},
fs::ReadDir,
io,
os::unix::{ffi::OsStrExt, process::CommandExt},
path::{Path, PathBuf},
process::{Command, ExitCode, ExitStatus},
};
use clap::Parser;
use itertools::Either;
#[derive(Parser)]
enum Args {
Single(Single),
Dir(Dir),
}
#[derive(Parser)]
struct Single {
source: PathBuf,
#[arg(long)]
subtitles: Option<PathBuf>,
#[arg(long)]
fonts_dir: Option<PathBuf>,
output: PathBuf,
}
#[derive(Parser)]
struct Dir {
input_dir: PathBuf,
output_dir: PathBuf,
}
fn find_subs(root: &Path, match_str: &OsStr) -> io::Result<Option<PathBuf>> {
for entry in root.read_dir()? {
let entry = entry?;
let type_ = entry.file_type()?;
if type_.is_dir() {
let recursed = find_subs(&entry.path(), match_str)?;
if recursed.is_some() {
return Ok(recursed);
}
} else {
// Assume found a file
let path = entry.path();
if path
.file_stem()
.unwrap()
.as_bytes()
.windows(match_str.as_bytes().len())
.any(|subslice| subslice == match_str.as_bytes())
&& path.extension() == Some(OsStr::new("ass"))
{
return Ok(Some(entry.path()));
}
}
}
Ok(None)
}
fn find_files(root: &Path, extension: &OsStr) -> impl Iterator<Item = io::Result<PathBuf>> {
struct FindFonts {
read_dirs: Vec<ReadDir>,
extension: OsString,
}
impl Iterator for FindFonts {
type Item = io::Result<PathBuf>;
fn next(&mut self) -> Option<Self::Item> {
loop {
let Some(next) = self.read_dirs.last_mut()?.next() else {
self.read_dirs.pop();
continue;
};
let entry = match next {
Err(e) => return Some(Err(e)),
Ok(entry) => entry,
};
let file_type = entry.file_type();
let file_type = match file_type {
Err(e) => return Some(Err(e)),
Ok(file_type) => file_type,
};
if file_type.is_dir() {
match entry.path().read_dir() {
Err(e) => return Some(Err(e)),
Ok(read_dir) => {
self.read_dirs.push(read_dir);
continue;
}
}
} else {
let path = entry.path();
if path.extension().is_some_and(|ex| ex == self.extension) {
return Some(Ok(path));
} else {
continue;
}
}
}
}
}
match root.read_dir() {
Ok(read_dir) => Either::Left(FindFonts {
read_dirs: vec![read_dir],
extension: extension.to_owned(),
}),
Err(e) => Either::Right(std::iter::once(Err(e))),
}
}
fn convert_single(
Single {
source,
subtitles,
fonts_dir,
output,
}: Single,
) -> io::Result<Command> {
let subtitles = if let Some(subtitles) = subtitles {
subtitles
} else {
find_subs(&source.parent().unwrap(), source.file_stem().unwrap())?.unwrap()
};
let fonts: Vec<PathBuf> = if let Some(fonts_dir) = fonts_dir {
fonts_dir
.read_dir()?
.map(|r| r.map(|entry| entry.path()))
.collect::<io::Result<_>>()?
} else {
find_files(source.parent().unwrap(), OsStr::new("ttf")).collect::<io::Result<_>>()?
};
let mut command = Command::new("mkvmerge");
command.arg("--output").args([
output.into_os_string(),
source.into_os_string(),
subtitles.into_os_string(),
]);
for font in fonts {
command
.args(&["--attachment-mime-type", "font/ttf", "--attach-file"])
.arg(font.into_os_string());
}
Ok(command)
}
fn main() -> io::Result<ExitCode> {
let args = Args::parse();
match args {
Args::Single(single) => {
let mut command = convert_single(single)?;
Err(command.exec())
}
Args::Dir(dir) => {
let files = find_files(&dir.input_dir, OsStr::new("mkv"));
let mut commands = Vec::new();
for file in files {
let input_file = file?;
let output_file = dir
.output_dir
.join(input_file.strip_prefix(&dir.input_dir).unwrap());
let subtitles = find_subs(&dir.input_dir, input_file.file_stem().unwrap())?;
if subtitles.is_none() {
continue;
}
let mut command = convert_single(Single {
source: input_file,
subtitles,
fonts_dir: None,
output: output_file.clone(),
})?;
std::fs::create_dir_all(output_file.parent().unwrap())?;
commands.push(command.spawn()?);
}
let mut status = 0;
for mut child in commands {
let child_status = child.wait()?;
if status == 0 && !child_status.success() {
status = child_status.code().unwrap_or(1);
}
}
Ok(ExitCode::from(status as u8))
}
}
}