commit cf1f7a149cc48dd2626af24561db5924c57217b4
Author: kitsunecafe <rowan@kitsu.cafe>
Date:   Fri Mar 8 03:17:16 2024 -0500

    initial

diff --git a/.gitignore b/.gitignore
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diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..1284d57
--- /dev/null
+++ b/src/main.rs
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+use std::{
+    error::Error as StdErr,
+    fmt::Display,
+    fs::{self, OpenOptions},
+    io::{self, Write},
+    path::{Path, PathBuf},
+    process::Command,
+};
+
+use clap::{command, Parser};
+use serde::Deserialize;
+use shellexpand::LookupError;
+
+const CONFIG_DIR: &'static str = "launchd";
+const CONFIG_NAME: &'static str = "config.toml";
+
+#[derive(Debug)]
+enum ErrorKind {
+    ConfigNotFound,
+    CantReadConfig,
+    DirNotFound,
+    CantReadDir,
+    InvalidInput,
+    NoInputGiven,
+    CantExecute,
+}
+
+#[derive(Debug)]
+struct Error {
+    kind: ErrorKind,
+    source: Option<Box<dyn StdErr>>,
+}
+
+impl Error {
+    pub fn new(kind: ErrorKind, source: Option<Box<dyn StdErr>>) -> Self {
+        Error { kind, source }
+    }
+}
+
+impl From<ErrorKind> for Error {
+    fn from(kind: ErrorKind) -> Self {
+        Self::new(kind, None)
+    }
+}
+
+impl<T: StdErr + 'static> From<LookupError<T>> for Error {
+    fn from(value: LookupError<T>) -> Self {
+        Self::new(ErrorKind::CantReadDir, Some(Box::new(value)))
+    }
+}
+
+impl Display for Error {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        match self.kind {
+            ErrorKind::ConfigNotFound => write!(f, "could not find config file"),
+            ErrorKind::CantReadConfig => write!(f, "could not read config file"),
+            ErrorKind::DirNotFound => write!(f, "could not find directory"),
+            ErrorKind::CantReadDir => write!(f, "could not read directory"),
+            ErrorKind::InvalidInput => write!(f, "given input is not valid"),
+            ErrorKind::NoInputGiven => write!(f, "input canceled by user"),
+            ErrorKind::CantExecute => write!(f, "couldn't launch executable"),
+        }
+    }
+}
+
+impl StdErr for Error {}
+
+#[derive(Deserialize, Debug)]
+pub struct Config {
+    pub executable_path: String,
+    pub wad_path: String,
+    pub default_wad: Option<String>,
+}
+
+fn touch<P: AsRef<Path>>(path: P) -> io::Result<()> {
+    match OpenOptions::new().create(true).write(true).open(path) {
+        Ok(_) => Ok(()),
+        Err(e) => Err(e),
+    }
+}
+
+fn make_config_path() -> Option<PathBuf> {
+    home::home_dir()
+        .map(|p| p.join(".config"))
+        .filter(|p| p.exists())
+        .map(|p| p.join(CONFIG_DIR))
+        .filter(|p| fs::create_dir_all(p).is_ok())
+        .map(|p| p.join(CONFIG_NAME))
+        .filter(|p| touch(p).is_ok())
+}
+
+fn config_path<P: AsRef<Path>>(path: &Option<P>) -> Result<PathBuf, Error> {
+    if let Some(path) = path {
+        let path = path.as_ref();
+        if path.is_file() {
+            Ok(path.to_path_buf())
+        } else if path.is_dir() {
+            config_path(&Some(path.join(CONFIG_NAME)))
+        } else {
+            Err(ErrorKind::ConfigNotFound.into())
+        }
+    } else {
+        config_path(&make_config_path())
+    }
+}
+
+fn read_config<P: AsRef<Path>>(path: P) -> Result<String, Error> {
+    fs::read_to_string(path.as_ref())
+        .map_err(|e| Error::new(ErrorKind::CantReadConfig, Some(Box::new(e))))
+}
+
+fn parse_config<'a, S: Into<&'a str>>(s: S) -> Result<Config, Error> {
+    toml::from_str(s.into()).map_err(|e| Error::new(ErrorKind::CantReadConfig, Some(Box::new(e))))
+}
+
+fn scan_wads<P: AsRef<Path>>(path: P) -> Result<Vec<PathBuf>, Error> {
+    let path = path.as_ref();
+
+    if path.is_dir() {
+        match fs::read_dir(path) {
+            Ok(v) => Ok(v.filter_map(|x| x.ok()).map(|x| x.path()).collect()),
+            Err(e) => Err(Error::new(ErrorKind::CantReadDir, Some(Box::new(e)))),
+        }
+    } else {
+        Err(Error::new(ErrorKind::DirNotFound, None))
+    }
+}
+
+fn prompt_wads<P: AsRef<Path>>(wads: &[P]) -> Result<&str, Error> {
+    let mut wads = wads
+        .iter()
+        .filter_map(|p| p.as_ref().file_name())
+        .filter_map(|p| p.to_str())
+        .enumerate();
+
+    for (i, wad) in wads.clone() {
+        println!("{i}: {wad}");
+    }
+
+    print!("Please pick an option: ");
+    std::io::stdout().flush().unwrap();
+    let mut input = String::new();
+
+    let selection = match io::stdin().read_line(&mut input) {
+        Ok(_) if input == "q" => Err(ErrorKind::NoInputGiven.into()),
+        Ok(0) => Err(ErrorKind::NoInputGiven.into()),
+        Ok(_) => Ok(input),
+        Err(e) => Err(Error::new(ErrorKind::InvalidInput, Some(Box::new(e)))),
+    }?;
+
+    let selection = selection
+        .trim()
+        .parse::<usize>()
+        .map_err(|e| Error::new(ErrorKind::InvalidInput, Some(Box::new(e))))?;
+
+    match wads.find(|(i, _)| *i == selection).map(|(_, wad)| wad) {
+        Some(v) => Ok(v),
+        None => Err(Error::new(ErrorKind::InvalidInput, None)),
+    }
+}
+
+fn select_wad<'a, P: AsRef<Path>>(wad: &str, wads: &'a [P]) -> Option<&'a Path> {
+    wads.iter()
+        .map(|p| p.as_ref().to_str())
+        .filter_map(|x| x)
+        .find(|p| p.contains(wad))
+        .map(Path::new)
+}
+
+#[derive(Parser, Debug)]
+#[command(version, about, long_about = None)]
+struct Arguments {
+    #[arg(short, long)]
+    config_path: Option<String>,
+    #[arg(short = 'd', long, default_value_t = false)]
+    set_default: bool,
+    wad: Option<String>,
+}
+
+fn main() -> Result<(), Error> {
+    let args = Arguments::parse();
+    let config = config_path(&args.config_path)
+        .and_then(read_config)
+        .and_then(|s| parse_config(s.as_str()))?;
+
+    let wads = shellexpand::full(&config.wad_path)
+        .map_err(Into::into)
+        .and_then(|p| scan_wads(p.to_string()))?;
+
+    let wad = if args.wad.is_some() {
+        args.wad
+    } else {
+        println!("using directory {}:", config.wad_path);
+        prompt_wads(&wads).map(str::to_string).ok()
+    };
+
+    if let Some(wad) = wad {
+        if let Some(selected) = select_wad(&wad, wads.as_slice()) {
+            let exec = shellexpand::full(&config.executable_path)?.to_string();
+
+            Command::new(&exec)
+                .arg(selected.as_os_str())
+                .spawn()
+                .map_err(|e| Error::new(ErrorKind::CantExecute, Some(Box::new(e))))?;
+        }
+    }
+
+    Ok(())
+}