Re: What key is bound to Something?

On 31/07/10 02:32, Jakson A. Aquino wrote:
> On Fri, Jul 30, 2010 at 8:37 PM, Tony Mechelynck
> <antoine.mechelynck@gmail.com> wrote:
>> On 31/07/10 00:12, Jakson A. Aquino wrote:
>>>
>>> Hi,
>>>
>>> I maintain a filetype plugin to R and the user can change the default
>>> key bindings by putting in the vimrc commands like:
>>>
>>> map<F2> <Plug>RStart
>>>
>>> How can I know in the ftplugin/r.vim what key is bound to
>>> <Plug>RStart? The plugin adds a menu to gui versions of Vim and I
>>> would like to tell in the menu all the key bindings, even the
>>> customized ones.
>>>
>>> Thanks,
>>>
>>> Jakson Aquino
>>>
>>> Note: the plugin is here:
>>> http://www.vim.org/scripts/script.php?script_id=2628
>>>
>>
>> It is possible to get a list of all mappings i.e. all user-defined key
>> bindings, see the thread "Writing :map and :map! to text file or something"
>> started 2010-07-26 09:42 -0700 by someone named "Gary".
>>
>> For default bindings it's harder: you would have to compile a list from the
>> various lists at ":help index.txt", write that statically that into your
>> script (and update it whenever that helpfile changes), and, at runtime,
>> *remove* from the list the keybindings which also have a user-defined
>> mapping in the same mode.
>
> Thanks for answering! This was rather a wish than an important thing
> to my plugin. I think it's overly complex to write the output of :map
> to a file and then search the file for all<Plug>Something that my
> plugin has just to know if there are a few custom key bindings. The
> goal was to help users of GVim to remember the key binds by looking at
> the menu, but I will assume that users who customize key bindings are
> advanced enough to either remember them or do ':map' if any was
> forgotten. i have already put in the plugin's documentation:
>
> Custom key bindings are not shown in Vim's menu, but you can
> type :map to see the list of current mappings.
>
> Best regards,
>
> Jakson Aquino
>

You can easily know _if_ there is a map to <Plug>something:

if hasmapto("\<Plug>",'nvoilc') || hasmapto("\<Plug>",'nvoilc',1)
echo 'there is a mapping or abbrev to ''<Plug>something'''
endif

see :help hasmapto()

Similarly, to know if some particular {lhs} (let's say <F2> has ben used,

:map <F2>
and/or
:map! <F2>

will show you any mappings beginning with <F2>; you can capture the
output even if using :silent, see :help :redir

Best regards,
Tony.
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