feat(_comp_compgen_help): allow nested brackets behind short option

Allows `-f A1[,A2[,A3]] --foo=A1[,A2[,A3]]` as used by smartctl.

Author: chrfranke

bash_completion

@@ -1694,7 +1694,7 @@ _comp_compgen_help()
     for _line in "${_lines[@]}"; do
         [[ $_line == *([[:blank:]])-* ]] || continue
         # transform "-f FOO, --foo=FOO" to "-f , --foo=FOO" etc
-        while [[ $_line =~ ((^|[^-])-[A-Za-z0-9?][[:space:]]+)\[?[A-Z0-9]+([,_-]+[A-Z0-9]+)?(\.\.+)?\]? ]]; do
+        while [[ $_line =~ ((^|[^-])-[A-Za-z0-9?][[:space:]]+)(\[,?)?[A-Z0-9]+([,_-]+[A-Z0-9]+)?(\.\.+)?\]* ]]; do
             _line=${_line/"${BASH_REMATCH[0]}"/"${BASH_REMATCH[1]}"}
         done
         _comp_compgen_help__parse "${_line// or /, }"

test/t/unit/test_unit_parse_help.py

@@ -203,6 +203,11 @@ def test_32(self, bash):
         output = assert_bash_exec(bash, "_parse_help fn", want_output=True)
         assert output.split() == "--exclude=".split()
 
+    def test_33(self, bash):
+        assert_bash_exec(bash, "fn() { echo '-f A1[,A2[,A3]] --foo=A1[,A2[,A3]]'; }")
+        output = assert_bash_exec(bash, "_parse_help fn", want_output=True)
+        assert output.split() == "--foo".split()
+
     def test_custom_helpopt1(self, bash):
         assert_bash_exec(bash, "fn() { [[ $1 == -h ]] && echo '-option'; }")
         output = assert_bash_exec(bash, "_parse_help fn -h", want_output=True)