add more code

src/args.rs

@@ -1,10 +1,34 @@
+use clap::Arg;
 use clap::Command;
-pub(crate) fn get_arg_parser() -> Command<'static> {
+
+pub const EDIT: &str = "edit";
+pub const GROUPS: &str = "groups";
+pub const SYNC: &str = "sync";
+pub const UNMANAGED: &str = "unmanaged";
+pub const VERSION: &str = "version";
+
+fn get_arg_parser() -> Command<'static> {
     let result = Command::new("pacdef")
         .about("declarative package manager for Arch Linux")
         .version("1.0.0-alpha")
         .subcommand_required(true)
         .arg_required_else_help(true)
-        .subcommand(Command::new("sync").about("install packages from all imported groups"));
+        .subcommand(
+            Command::new(EDIT)
+                .about("edit one or more existing group files")
+                .arg_required_else_help(true)
+                .arg(Arg::new("group")),
+        )
+        .subcommand(Command::new(GROUPS).about("show names of imported groups"))
+        .subcommand(Command::new(SYNC).about("install packages from all imported groups"))
+        .subcommand(
+            Command::new(UNMANAGED)
+                .about("show explicitly installed packages not managed by pacdef"),
+        )
+        .subcommand(Command::new(VERSION).about("show version info"));
     result
 }
+
+pub fn get_matched_arguments() -> clap::ArgMatches {
+    get_arg_parser().get_matches()
+}