refactor: replace compgen -c -d with _comp_compgen_commands

Author: scop

bash_completion

@@ -2581,8 +2581,7 @@ _comp_command_offset()
     _comp_get_words cur
 
     if ((COMP_CWORD == 0)); then
-        compopt -o filenames
-        _comp_compgen -- -d -c
+        _comp_compgen_commands
     else
         _comp_dequote "${COMP_WORDS[0]}" || ret=${COMP_WORDS[0]}
         local cmd=$ret compcmd=$ret

completions/_su

@@ -19,8 +19,7 @@ _comp_cmd_su()
             return
             ;;
         -c | --command | --session-command)
-            compopt -o filenames
-            _comp_compgen -- -d -c
+            _comp_compgen_commands
             return
             ;;
     esac

completions/gdb

@@ -20,7 +20,7 @@ _comp_cmd_gdb()
         if _comp_looks_like_path "$cur"; then
             # compgen -c works as expected if $cur contains any slashes.
             local PATH="$PATH:."
-            _comp_compgen -- -d -c
+            _comp_compgen_commands
         else
             # otherwise compgen -c contains Bash's built-in commands,
             # functions and aliases. Thus we need to retrieve the program