Revert "add error NoGroupFilesInArguments"

This partially reverts commit a4c900c9a7.

TODO.md is unaffected by this.

crates/main/main.rs

@@ -27,17 +27,11 @@ fn main() -> ExitCode {
 
 /// Skip printing the error chain when searching packages yields no results, otherwise report error
 /// chain.
-#[allow(clippy::option_if_let_else)]
 fn handle_final_result(result: Result<()>) -> ExitCode {
     match result {
         Ok(_) => ExitCode::SUCCESS,
         Err(ref e) => {
-            if let Some(pacdef_err) = e.root_cause().downcast_ref::<pacdef_core::Error>() {
-                match pacdef_err {
-                    pacdef_core::Error::NoPackagesFound => (),
-                    pacdef_core::Error::NoGroupFilesInArguments => eprintln!("{pacdef_err}"),
-                    _ => eprintln!("unexpected error"),
-                };
+            if e.root_cause().to_string() == pacdef_core::Error::NoPackagesFound.to_string() {
                 ExitCode::FAILURE
             } else {
                 result.report()

crates/pacdef_core/src/args.rs

@@ -45,8 +45,7 @@ fn get_group_cmd() -> Command {
                 .short('e')
                 .long("edit")
                 .help("edit the new group files after creation")
-                .action(clap::ArgAction::SetTrue)
-                .num_args(0),
+                .action(clap::ArgAction::SetTrue),
         )
         .arg(Arg::new("groups").num_args(1..).required(true))
         .visible_alias("n");

crates/pacdef_core/src/core.rs

@@ -315,9 +315,8 @@ fn get_group_file_paths_matching_args<'a>(
     groups: &'a HashSet<Group>,
 ) -> Result<Vec<&'a Path>> {
     let file_names: Vec<_> = arg_match
-        .get_many::<String>("groups")
-        .context("getting groups from args")
-        .map_err(|_| crate::errors::Error::NoGroupFilesInArguments)?
+        .get_many::<String>("group")
+        .context("getting groups from args")?
         .collect();
 
     let name_group_map: HashMap<&str, &Group> =

crates/pacdef_core/src/errors.rs

@@ -7,15 +7,12 @@ use std::fmt::Display;
 pub enum Error {
     /// Package search yields no results.
     NoPackagesFound,
-    /// No group files were provided as arguments.
-    NoGroupFilesInArguments,
 }
 
 impl Display for Error {
     fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
         match self {
             Self::NoPackagesFound => f.write_str("no packages matching query"),
-            Self::NoGroupFilesInArguments => f.write_str("no group files in arguments"),
         }
     }
 }