first version of uw8-tool pack command

uw8-tool/src/main.rs

@@ -1,9 +1,45 @@
 mod base_module;
+mod pack;
+
+use std::path::PathBuf;
 
-use base_module::BaseModule;
 use anyhow::Result;
+use base_module::BaseModule;
+use pico_args::Arguments;
 
 fn main() -> Result<()> {
+    let mut args = Arguments::from_env();
+
+    if let Some(cmd) = args.subcommand()? {
+        match cmd.as_str() {
+            "make-base" => {
+                let version: u32 = args.free_from_str()?;
+                BaseModule::for_format_version(version)?
+                    .write_to_file(format!("base{}.wasm", version))?;
+            }
+            "pack" => {
+                let version: u32 = args.opt_value_from_str(["-v", "--version"])?.unwrap_or(1);
+                let source: PathBuf = args.free_from_str()?;
+                let dest: PathBuf = args.free_from_str()?;
+                pack::pack(&source, &dest, version)?;
+            }
+            _ => {
+                eprintln!("Unknown subcommand '{}'", cmd);
+                print_help();
+            }
+        }
+    } else {
+        print_help();
+    }
+
     BaseModule::for_format_version(1)?.write_to_file("base.wasm")?;
     Ok(())
 }
+
+fn print_help() {
+    println!(
+        "Usage:
+    uw8-tool make-base <version>
+    uw8-tool pack <wasm file> <uw8 file>"
+    );
+}