Re: [PATCH] Add tab completion for TUI's "focus" command

[Doug Evans <dje@google.com>]

On Sun, Jun 21, 2015 at 10:30 PM, Patrick Palka <patrick@parcs.ath.cx> wrote:
> The implementation is pretty straightforward, though there's the
> question of what the completion list should show when the TUI has not
> yet been initalized.

Hi.
What does "not yet been initialized" mean here?

> At that point no TUI window is considered visible
> thus the completion list will be composed of only the "next" and "prev"
> keywords (which are always added to the completion list).  But
> technically the commands "focus cmd" and "focus src" will work even when
> the TUI is not yet initialized because the initialization done in the
> meantime will make these windows visible by default.  So should the
> entries "cmd" and "src" be added to the completion list as special
> cases when the TUI is not yet initialized?
>
> gdb/ChangeLog:
>
>         * tui/tui-win.c (focus_completer): New static function.
>         (_initialize_tui_win): Set the completion function of the
>         "focus" command to focus_completer.
>
> gdb/testsuite/ChangeLog:
>
>         * gdb.base/completion.exp: Test the completion of the "focus"
>         command.
> ---
>  gdb/testsuite/gdb.base/completion.exp | 18 +++++++++++
>  gdb/tui/tui-win.c                     | 59 ++++++++++++++++++++++++++++++++++-
>  2 files changed, 76 insertions(+), 1 deletion(-)
>
> diff --git a/gdb/testsuite/gdb.base/completion.exp b/gdb/testsuite/gdb.base/completion.exp
> index 4c31bfc..5c20f26 100644
> --- a/gdb/testsuite/gdb.base/completion.exp
> +++ b/gdb/testsuite/gdb.base/completion.exp
> @@ -878,3 +878,21 @@ if {![skip_tui_tests]} {
>         }
>      }
>  }
> +if {![skip_tui_tests]} {
> +    with_test_prefix "focus command" {
> +       set test "test completion"
> +       send_gdb "focus\t\t\t"

I think I understand the purpose of three tabs here,
but I'm wondering what happens if we add a "focus-foo" command.
Seems like it'd be more robust to replace the first tab with a space.

> +       gdb_test_multiple "" "$test" {
> +           -re "next *prev *\r\n$gdb_prompt focus $" {
> +               pass "$test"
> +           }
> +       }
> +       send_gdb "\003"
> +       set test "quit command input after testing completion"
> +       gdb_test_multiple "" "$test" {
> +           -re "$gdb_prompt $" {
> +               pass "$test"
> +           }
> +       }
> +    }
> +}
> diff --git a/gdb/tui/tui-win.c b/gdb/tui/tui-win.c
> index 8c0685b..8860ca7 100644
> --- a/gdb/tui/tui-win.c
> +++ b/gdb/tui/tui-win.c
> @@ -354,6 +354,61 @@ tui_set_var_cmd (char *null_args, int from_tty, struct cmd_list_element *c)
>      tui_rehighlight_all ();
>  }
>
> +/* Complete possible window names to focus on.  TEXT is the complete text
> +   entered so far, WORD is the word currently being completed.  */
> +
> +static VEC (char_ptr) *
> +focus_completer (struct cmd_list_element *ignore,
> +                 const char *text, const char *word)
> +{
> +  VEC (const_char_ptr) *completion_name_vec = NULL;
> +  VEC (char_ptr) *matches_vec;
> +  int win_type;
> +
> +  for (win_type = SRC_WIN; win_type < MAX_MAJOR_WINDOWS; win_type++)
> +    {
> +      const char *completion_name = NULL;
> +
> +      /* We can't focus on an invisible window.  */
> +      if (tui_win_list[win_type] == NULL
> +         || !tui_win_list[win_type]->generic.is_visible)
> +       continue;
> +
> +      switch (win_type)
> +       {
> +       case SRC_WIN:
> +         completion_name = "src";
> +         break;
> +       case DISASSEM_WIN:
> +         completion_name = "asm";
> +         break;
> +       case DATA_WIN:
> +         completion_name = "regs";
> +         break;
> +       case CMD_WIN:
> +         completion_name = "cmd";
> +         break;
> +       default:
> +         break;
> +       }
> +
> +      if (completion_name != NULL)
> +       VEC_safe_push (const_char_ptr, completion_name_vec, completion_name);
> +    }
> +
> +  VEC_safe_push (const_char_ptr, completion_name_vec, "next");
> +  VEC_safe_push (const_char_ptr, completion_name_vec, "prev");
> +  VEC_safe_push (const_char_ptr, completion_name_vec, NULL);
> +
> +  matches_vec
> +    = complete_on_enum (VEC_address (const_char_ptr, completion_name_vec),
> +                       text, word);
> +
> +  VEC_free (const_char_ptr, completion_name_vec);
> +
> +  return matches_vec;
> +}
> +
>  /* Function to initialize gdb commands, for tui window
>     manipulation.  */
>
> @@ -365,6 +420,7 @@ _initialize_tui_win (void)
>  {
>    static struct cmd_list_element *tui_setlist;
>    static struct cmd_list_element *tui_showlist;
> +  struct cmd_list_element *focus_cmd;
>
>    /* Define the classes of commands.
>       They will appear in the help list in the reverse of this order.  */
> @@ -393,7 +449,7 @@ regs : the register display\n"));
>    add_com_alias ("wh", "winheight", class_tui, 0);
>    add_info ("win", tui_all_windows_info,
>             _("List of all displayed windows.\n"));
> -  add_com ("focus", class_tui, tui_set_focus_command, _("\
> +  focus_cmd = add_com ("focus", class_tui, tui_set_focus_command, _("\
>  Set focus to named window or next/prev window.\n\
>  Usage: focus {<win> | next | prev}\n\
>  Valid Window names are:\n\
> @@ -402,6 +458,7 @@ asm  : the disassembly window\n\
>  regs : the register display\n\
>  cmd  : the command window\n"));
>    add_com_alias ("fs", "focus", class_tui, 0);
> +  set_cmd_completer (focus_cmd, focus_completer);
>    add_com ("+", class_tui, tui_scroll_forward_command, _("\
>  Scroll window forward.\n\
>  Usage: + [win] [n]\n"));
> --
> 2.4.4.410.g43ed522.dirty
>