refactor: add simple clap cli.

ashen/src/asset/pack_file.rs

@@ -1,6 +1,6 @@
 //! This only works with the last version of Ashen :).
 
-mod directory;
+pub mod directory;
 
 use crate::utils::nom::*;
 

ashen/src/asset/pack_file/directory.rs

@@ -19,11 +19,11 @@ impl FileHandle {
 }
 
 #[derive(Default, Debug)]
-struct PackFileDirectory {
+pub struct VirtualFileSystem {
     files: BTreeMap<PathBuf, FileHandle>,
 }
 
-impl PackFileDirectory {
+impl VirtualFileSystem {
     pub fn from_106_packfile(pack: PackFile) -> Option<Self> {
         let mut files = BTreeMap::new();
 
@@ -250,7 +250,7 @@ mod tests {
     fn packfile_directory_works() -> eyre::Result<()> {
         let (_, pack_file) = PackFile::new(&ROM_DATA)?;
 
-        let dir = PackFileDirectory::from_106_packfile(pack_file).unwrap();
+        let dir = VirtualFileSystem::from_106_packfile(pack_file).unwrap();
         let dir = dir.walk("/", true)?;
 
         for file in dir {

cli/Cargo.toml

@@ -5,3 +5,4 @@ edition = "2021"
 
 [dependencies]
 ashen = { path = "../ashen/" }
+clap = { version = "4.5.20", features = ["derive"] }

cli/src/main.rs

@@ -1,3 +1,38 @@
-fn main() {
-    println!("Hello, world!");
+use std::{error::Error, io, path::PathBuf};
+
+use ashen::asset::pack_file::{directory::VirtualFileSystem, PackFile};
+use clap::Parser;
+
+#[derive(Parser)]
+#[command(version, about)]
+pub enum Cli {
+    /// Output packfile contents.
+    Output {
+        /// The path of the 'pack'.file
+        path: PathBuf,
+    },
+}
+
+// enum AssetKind {
+//     Copyright,
+// }
+
+fn main() -> Result<(), Box<dyn Error>> {
+    let cli = Cli::parse();
+
+    match cli {
+        Cli::Output { path } => {
+            let pack = std::fs::read(path)?;
+            let (_, pack) = PackFile::new(&pack)?;
+
+            let dir = VirtualFileSystem::from_106_packfile(pack)
+                .ok_or_else(|| io::Error::from(io::ErrorKind::InvalidInput))?;
+
+            let handle = dir.read("/copyright")?;
+
+            std::fs::write("./output/cli/copyright.txt", handle.bytes())?;
+        }
+    }
+
+    Ok(())
 }