Refactor unpacking functionality into separate module

src/args.rs

@@ -1,8 +1,8 @@
-use std::path::PathBuf;
 use clap::Parser;
+use std::path::{PathBuf};
 
 /// Program for unpacking unitypackages files.
-#[derive(Parser, Debug)]
+#[derive(Parser, Debug, Clone)]
 #[command(author, version, about, long_about = None)]
 pub struct Args {
     /// .unitypackage file to extract
@@ -19,4 +19,4 @@ pub struct Args {
     /// optional- extensions that will be ignored during unpacking
     #[arg(long, action = clap::ArgAction::Append)]
     pub ignore_extensions: Option<Vec<String>>,
-}
+}

src/main.rs

@@ -1,157 +1,19 @@
 mod args;
+mod unpacker;
 
-use flate2::read::GzDecoder;
-use hashbrown::HashMap;
-use std::ffi::OsStr;
-use std::fs::File;
-use std::path::{Path, PathBuf};
-use std::{fs, io, sync::Arc};
-use tar::Archive;
 use clap::Parser;
-use rayon::prelude::*;
-use std::io::prelude::*;
-use std::io::BufReader;
-use std::process::Command;
-use std::sync::mpsc::channel;
 
-pub fn extract_archive(archive_path: &Path, extract_to: &Path) -> io::Result<()> {
+
-    let tar_gz = File::open(archive_path)?;
+
-    let tar = GzDecoder::new(tar_gz);
+
-    let mut archive = Archive::new(tar);
+
-    archive.unpack(extract_to)?;
+
-    Ok(())
+
-}
 
 fn main() {
     let args = crate::args::Args::parse();
-    let ignored_extensions = args.ignore_extensions.unwrap_or_default();
+    let unpacker = crate::unpacker::Unpacker { args };
-    let archive_path = Path::new(&args.input);
-    let tmp_dir = Path::new("./tmp_dir");
-    let output_dir = Path::new(&args.output);
-    if !archive_path.exists() {
-        panic!("Input file does not exits");
-    }
-    if tmp_dir.exists() {
-        println!("Temp directory exits, cleaning up first.");
-        fs::remove_dir_all(tmp_dir).unwrap();
-    }
-    if let Err(e) = extract_archive(archive_path, tmp_dir) {
-        println!("Failed to extract archive: {}", e);
-    }
-    if output_dir.exists() {
-        println!("Output directory exits, cleaning up first.");
-        fs::remove_dir_all(output_dir).unwrap();
-    }
-    fs::create_dir(output_dir).unwrap();
-    let (sender, receiver) = channel();
 
-    fs::read_dir(tmp_dir).unwrap().par_bridge().for_each_with(sender, |s,entry| {
+    unpacker.prepare_environment();
-        let entry = entry.unwrap();
+    unpacker.process_data();
-        let root_file = entry.path();
-        let asset = entry.file_name().into_string().unwrap();
-        if !root_file.is_dir() {
-            return;
-        }
-        let mut real_path = String::new();
-        let mut extension = None;
-        let mut has_asset = false;
-        for sub_entry in fs::read_dir(root_file.clone()).unwrap() {
-            let sub_entry = sub_entry.unwrap();
-            let file_name = sub_entry.file_name().into_string().unwrap();
-            if file_name == "pathname" {
-                let path = sub_entry.path();
-                let file = File::open(path).unwrap();
-                let buf_reader = BufReader::new(file);
-                let line = buf_reader.lines().next();
-                match line {
-                    Some(Ok(path)) => {
-                        real_path = path;
-                        if let Some(e) =
-                            Path::new(&real_path).extension().and_then(OsStr::to_str)
-                        {
-                            extension = Some(String::from(e));
-                        }
-                    }
-                    _ => continue,
-                }
-            } else if file_name == "asset" {
-                has_asset = true;
-            }
-        }
-        if has_asset && !ignored_extensions.contains(&extension.unwrap_or_default()) {
-            s.send((asset, real_path)).unwrap();
-        }
-    });
-    let mapping: HashMap<String, String> = receiver.iter().collect();
-    let mapping_arc = Arc::new(mapping);
-
-    let tmp_dir = Arc::new(tmp_dir);
-    let output_dir = Arc::new(output_dir);
-
-    mapping_arc.par_iter().for_each(|(asset_hash, asset_path)| {
-        let path = Path::new(asset_path);
-        let source_asset = Path::new(&*tmp_dir).join(&asset_hash).join("asset");
-        let result_path = output_dir.join(&path);
-
-        process_directory(&asset_hash, &asset_path, &result_path);
-        check_source_asset_exists(&source_asset);
-
-        if args.fbx_to_gltf.is_some() {
-            if let Some("fbx") = path.extension().and_then(OsStr::to_str) {
-                process_fbx_file(
-                    &source_asset,
-                    &result_path,
-                    &args.fbx_to_gltf.clone().unwrap(),
-                );
-                return;
-            }
-        }
-
-        process_non_fbx_file(&source_asset, &result_path);
-    });
-
-    fs::remove_dir_all(Path::new(&*tmp_dir)).unwrap();
-
-    fn process_directory(asset_hash: &str, asset_path: &str, result_path: &Path) {
-        println!("{}: {:?}", asset_hash, asset_path);
-        let result_dir = result_path.parent().unwrap();
-        if !result_dir.exists() {
-            fs::create_dir_all(result_dir).unwrap();
-        }
-    }
-
-    fn check_source_asset_exists(source_asset: &Path) {
-        if !source_asset.exists() {
-            panic!("SOURCE ASSET DOES NOT EXIST: {}", source_asset.display());
-        }
-    }
-
-    fn process_fbx_file(source_asset: &Path, result_path: &Path, tool: &PathBuf) {
-        let out_path = result_path.with_extension("");
-        println!(
-            "{:?}",
-            &[
-                "--input",
-                source_asset.to_str().unwrap(),
-                "--output",
-                out_path.to_str().unwrap()
-            ]
-        );
-        let output = Command::new(tool)
-            .args([
-                "--input",
-                source_asset.to_str().unwrap(),
-                "-b",
-                "--output",
-                out_path.to_str().unwrap(),
-            ])
-            .output()
-            .unwrap();
-        let output_result = String::from_utf8_lossy(&output.stdout);
-        println!("output: {}", output_result);
-    }
-
-    fn process_non_fbx_file(source_asset: &Path, result_path: &Path) {
-        fs::rename(source_asset, result_path).unwrap();
-    }
 }

src/unpacker.rs

@@ -0,0 +1,172 @@
+use flate2::read::GzDecoder;
+use hashbrown::HashMap;
+use std::ffi::OsStr;
+use std::fs::File;
+use std::io::BufRead;
+use std::io::BufReader;
+use std::path::{Path, PathBuf};
+use std::process::Command;
+use std::sync::Arc;
+use std::{fs, io};
+
+use rayon::prelude::*;
+use std::sync::mpsc::channel;
+use tar::Archive;
+
+#[derive(Clone)]
+pub struct Unpacker {
+    pub args: crate::args::Args,
+}
+
+impl Unpacker {
+    pub fn prepare_environment(&self) {
+        let archive_path = Path::new(&self.args.input);
+        let output_dir = Path::new(&self.args.output);
+        let tmp_path = Path::new("./tmp_dir");
+        if !archive_path.exists() {
+            panic!("Input file does not exits");
+        }
+        if tmp_path.exists() {
+            println!("Temp directory exits, cleaning up first.");
+            fs::remove_dir_all(tmp_path).unwrap();
+        }
+        if output_dir.exists() {
+            println!("Output directory exits, cleaning up first.");
+            fs::remove_dir_all(output_dir).unwrap();
+        }
+    }
+
+    pub fn process_data(&self) {
+        let archive_path = Path::new(&self.args.input);
+        let output_dir = Path::new(&self.args.output);
+        let tmp_path = Path::new("./tmp_dir");
+        if let Err(e) = Unpacker::extract_archive(archive_path, tmp_path) {
+            println!("Failed to extract archive: {}", e);
+        }
+
+        let (sender, receiver) = channel();
+        let ignored_extensions = self.args.clone().ignore_extensions.unwrap_or_default();
+
+        fs::read_dir(tmp_path)
+            .unwrap()
+            .par_bridge()
+            .for_each_with(sender, |s, entry| {
+                let entry = entry.unwrap();
+                let root_file = entry.path();
+                let asset = entry.file_name().into_string().unwrap();
+                if !root_file.is_dir() {
+                    return;
+                }
+                let mut real_path = String::new();
+                let mut extension = None;
+                let mut has_asset = false;
+                for sub_entry in fs::read_dir(root_file.clone()).unwrap() {
+                    let sub_entry = sub_entry.unwrap();
+                    let file_name = sub_entry.file_name().into_string().unwrap();
+                    if file_name == "pathname" {
+                        let path = sub_entry.path();
+                        let file = File::open(path).unwrap();
+                        let buf_reader = BufReader::new(file);
+                        let line = buf_reader.lines().next();
+                        match line {
+                            Some(Ok(path)) => {
+                                real_path = path;
+                                if let Some(e) =
+                                    Path::new(&real_path).extension().and_then(OsStr::to_str)
+                                {
+                                    extension = Some(String::from(e));
+                                }
+                            }
+                            _ => continue,
+                        }
+                    } else if file_name == "asset" {
+                        has_asset = true;
+                    }
+                }
+                if has_asset && !ignored_extensions.contains(&extension.unwrap_or_default()) {
+                    s.send((asset, real_path)).unwrap();
+                }
+            });
+
+        let tmp_dir = Arc::new(tmp_path);
+        fs::create_dir(output_dir).unwrap();
+        let output_dir = Arc::new(output_dir);
+        let mapping: HashMap<String, String> = receiver.iter().collect();
+        let mapping_arc = Arc::new(mapping);
+
+        mapping_arc.par_iter().for_each(|(asset_hash, asset_path)| {
+            let path = Path::new(asset_path);
+            let source_asset = Path::new(&*tmp_dir).join(asset_hash).join("asset");
+            let result_path = output_dir.join(path);
+
+            process_directory(asset_hash, asset_path, &result_path);
+            check_source_asset_exists(&source_asset);
+
+            if self.args.fbx_to_gltf.is_some() {
+                if let Some("fbx") = path.extension().and_then(OsStr::to_str) {
+                    process_fbx_file(
+                        &source_asset,
+                        &result_path,
+                        &self.args.fbx_to_gltf.clone().unwrap(),
+                    );
+                    return;
+                }
+            }
+
+            process_non_fbx_file(&source_asset, &result_path);
+        });
+
+        fs::remove_dir_all(Path::new(&*tmp_dir)).unwrap();
+
+        fn process_directory(asset_hash: &str, asset_path: &str, result_path: &Path) {
+            println!("{}: {:?}", asset_hash, asset_path);
+            let result_dir = result_path.parent().unwrap();
+            if !result_dir.exists() {
+                fs::create_dir_all(result_dir).unwrap();
+            }
+        }
+
+        fn check_source_asset_exists(source_asset: &Path) {
+            if !source_asset.exists() {
+                panic!("SOURCE ASSET DOES NOT EXIST: {}", source_asset.display());
+            }
+        }
+
+        fn process_fbx_file(source_asset: &Path, result_path: &Path, tool: &PathBuf) {
+            let out_path = result_path.with_extension("");
+            println!(
+                "{:?}",
+                &[
+                    "--input",
+                    source_asset.to_str().unwrap(),
+                    "--output",
+                    out_path.to_str().unwrap()
+                ]
+            );
+            let output = Command::new(tool)
+                .args([
+                    "--input",
+                    source_asset.to_str().unwrap(),
+                    "-b",
+                    "--output",
+                    out_path.to_str().unwrap(),
+                ])
+                .output()
+                .unwrap();
+            let output_result = String::from_utf8_lossy(&output.stdout);
+            println!("output: {}", output_result);
+        }
+
+        fn process_non_fbx_file(source_asset: &Path, result_path: &Path) {
+            fs::rename(source_asset, result_path).unwrap();
+        }
+    }
+
+    fn extract_archive(archive_path: &Path, extract_to: &Path) -> io::Result<()> {
+        let tar_gz = File::open(archive_path)?;
+        let tar = GzDecoder::new(tar_gz);
+        let mut archive = Archive::new(tar);
+        archive.unpack(extract_to)?;
+        Ok(())
+    }
+}