fix(_comp_{first_arg,count_args}): count any arguments after --

bash_completion

@@ -2168,6 +2168,9 @@ _comp_get_first_arg()
         if [[ ${words[i]} != -?* ]]; then
             arg=${words[i]}
             break
+        elif [[ ${words[i]} == -- ]]; then
+            ((i + 1 < cword)) && arg=${words[i + 1]}
+            break
         fi
     done
 }
@@ -2190,6 +2193,9 @@ _comp_count_args()
         if [[ ${words[i]} != -?* && ${words[i - 1]} != ${2-} ||
             ${words[i]} == ${3-} ]]; then
             ((ret++))
+        elif [[ ${words[i]} == -- ]]; then
+            ((ret += cword - i - 1))
+            break
         fi
     done
 }

bash_completion.d/000_bash_completion_compat.bash

@@ -401,7 +401,8 @@ _fstypes()
 # This function returns the first argument, excluding options
 # @deprecated 2.12 Use `_comp_get_first_arg`.  Note that the new function
 # `_comp_get_first_arg` operates on `words` and `cword` instead of `COMP_WORDS`
-# and `COMP_CWORD`.
+# and `COMP_CWORD`.  The new function considers a command-line argument after
+# `--` as an argument.
 _get_first_arg()
 {
     local i
@@ -423,7 +424,8 @@ _get_first_arg()
 # @var[out] args   Return the number of arguments
 # @deprecated 2.12 Use `_comp_count_args`.  Note that the new function
 # `_comp_count_args` returns the result in variable `ret` instead of `args`.
-# In the new function, `-` is also counted as an argument.
+# In the new function, `-` is also counted as an argument.  The new function
+# counts all the arguments after `--`.
 # shellcheck disable=SC2178 # assignments are not intended for global "args"
 _count_args()
 {

test/t/unit/test_unit_count_args.py

@@ -78,3 +78,15 @@ def test_10_single_hyphen_2(self, bash):
             bash, "(a -b - c - e)", 5, "a -b - c - e", 11, arg='"" "-b"'
         )
         assert output == "3"
+
+    def test_11_double_hyphen_1(self, bash):
+        """all the words after -- should be counted"""
+        output = self._test(
+            bash, "(a -b -- -c -d e)", 5, "a -b -- -c -d e", 14
+        )
+        assert output == "3"
+
+    def test_11_double_hyphen_2(self, bash):
+        """all the words after -- should be counted"""
+        output = self._test(bash, "(a b -- -c -d e)", 5, "a b -- -c -d e", 13)
+        assert output == "4"

test/t/unit/test_unit_get_first_arg.py

@@ -55,3 +55,17 @@ def test_7_single_hyphen(self, bash, functions):
             bash, '_comp__test_unit "(a -b - c -d e)" 5', want_output=None
         ).strip()
         assert output == "-"
+
+    def test_8_double_hyphen_1(self, bash, functions):
+        """any word after -- should be picked"""
+        output = assert_bash_exec(
+            bash, '_comp__test_unit "(a -b -- -c -d e)" 5', want_output=None
+        ).strip()
+        assert output == "-c"
+
+    def test_8_double_hyphen_2(self, bash, functions):
+        """any word after -- should be picked only without any preceding argument"""
+        output = assert_bash_exec(
+            bash, '_comp__test_unit "(a b -- -c -d e)" 5', want_output=None
+        ).strip()
+        assert output == "b"