commit 42406483acaf5aa53b265ed0b01b0b0dd976a5ed
Author: Skye <me@skye-c.at>
Date:   Mon Nov 11 18:59:04 2024 -0500

    Initial commit

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..ea8c4bf
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+/target
diff --git a/Cargo.lock b/Cargo.lock
new file mode 100644
index 0000000..c67305e
--- /dev/null
+++ b/Cargo.lock
@@ -0,0 +1,253 @@
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diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..98de9bd
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,8 @@
+[package]
+name = "subtitle-merge"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+clap = { version = "4.5.20", features = ["derive"] }
+itertools = "0.13.0"
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..033710c
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,188 @@
+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))
+        }
+    }
+}