fix: options can accept single dash value (#341)

src/build.rs

@@ -24,7 +24,9 @@ _argc_take_args() {
         while [[ $_argc_take_index -lt $_argc_len ]]; do
             _argc_take_value="${argc__args[_argc_take_index]}"
             if [[ -n "$signs" ]] && [[ "$_argc_take_value" =~ ^["$signs"] ]]; then
-                break
+                if [[ "${#_argc_take_value}" -gt 1 ]] || [[ "$_argc_take_index" == $(($_argc_len - 1)) ]]; then
+                    break
+                fi
             fi
             _argc_take_args_values+=("$_argc_take_value")
             _argc_take_args_len=$((_argc_take_args_len + 1))

src/matcher.rs

@@ -137,7 +137,7 @@ impl<'a, 'b, T: Runtime> Matcher<'a, 'b, T> {
                         &mut is_rest_args_positional,
                         cmd,
                     );
-                } else if arg.starts_with(|c| signs.contains(c)) {
+                } else if arg.len() > 1 && arg.starts_with(|c| signs.contains(c)) {
                     if let Some((k, v)) = arg.split_once('=') {
                         if let Some(param) = cmd.find_flag_option(k) {
                             add_param_choice_fn(&mut choice_fns, param);
@@ -1186,9 +1186,10 @@ fn take_value_args<'a>(
     if assigned || len == 0 {
         return output;
     }
-    let end = (start + len).min(args.len());
-    for arg in args.iter().take(end).skip(start) {
-        if arg.starts_with(|c| signs.contains(c)) {
+    let args_len = args.len();
+    let end = (start + len).min(args_len);
+    for (i, arg) in args.iter().enumerate().take(end).skip(start) {
+        if arg.starts_with(|c| signs.contains(c)) && (arg.len() > 1 || i == args_len - 1) {
             break;
         }
         output.push(arg.as_str());

tests/snapshots/integration__spec__option_single_dash.snap

@@ -0,0 +1,28 @@
+---
+source: tests/spec.rs
+expression: data
+---
+************ RUN ************
+prog --oa -
+
+# OUTPUT
+command cat >&2 <<-'EOF' 
+error: incorrect number of values for `--oa <OA>`
+EOF
+exit 1
+
+# RUN_OUTPUT
+error: incorrect number of values for `--oa <OA>`
+
+************ RUN ************
+prog --oa - 
+
+# OUTPUT
+argc_oa=-
+argc__args=( prog --oa - '' )
+argc__positionals=( '' )
+
+# RUN_OUTPUT
+argc__args=([0]="prog" [1]="--oa" [2]="-" [3]="")
+argc__positionals=([0]="")
+argc_oa=-

tests/spec.rs

@@ -406,3 +406,14 @@ cmd_a() { :; }
         ]
     );
 }
+
+#[test]
+fn option_single_dash() {
+    let script = r###"
+# @option --oa
+"###;
+    snapshot_multi!(
+        script,
+        [vec!["prog", "--oa", "-"], vec!["prog", "--oa", "-", ""],]
+    );
+}