Re: How can I take control over jumps `Ctrl-O` and `Ctrl-I` in Vimscript?

2015-10-07 19:07 GMT+03:00 Annis Monadjem <annismonadjem@gmail.com>:
> On Wednesday, October 7, 2015 at 9:01:25 AM UTC+2, Christian Brabandt wrote:
>> Hi Annis!
>>
>> On Di, 06 Okt 2015, Annis Monadjem wrote:
>>
>> > On Wednesday, October 7, 2015 at 12:39:30 AM UTC+2, Annis Monadjem
>> > wrote:
>> > > Is there any way I could use Vimscript to go through the list of
>> > > jumps `Ctrl-O`, `Ctrl-I` and to pick the previous jump
>> > > buffers/positions?
>> > >
>> > > Any suggestion is greatly appreciated.
>> >
>> > Hi Tony, Thanks for your comments. I'm not there still. I'm trying to
>> > write a Vimscript and I just need a hint on how to approach the
>> > problem.
>> >
>> > I'm keeping all my Vim-Help-jump-buffers 'nobuflisted', except for the
>> > very last Vim-Help-buffer which is 'buflisted'. I am doing this
>> > purposely to keep my listing ':ls' concise and short. Most other
>> > non-Help-buffers and their jumps would be 'buflisted', except for
>> > deleted ones.
>> >
>> > When pressing 'Ctrl-O' I'd like to jump to earlier history of
>> > positions/buffers of both Vim-Help-jump-buffers as well as
>> > non-Help-buffers. In particular I would like to jump to
>> > Vim-Help-jump-buffers even if these are 'nobuflisted'. While jumping
>> > back to each earlier buffer I would like to make the new `Ctrl-O`
>> > target buffer only 'buflisted' while the previous buffer
>> > 'nobuflisted'. Problem is that `Ctrl-O` does not point nor open a
>> > 'nobuflisted' buffer (at least I don't know) and I'd don't want to
>> > 'buflisted' all Vim-Help-jump-buffers except the loaded/visible one.
>> >
>> > Please, share with me what would be my best approach to vimscript this
>> > problem.
>>
>> I don't follow. Are you saying, that C-O/C-I does not jump if that
>> particular buffer has been set to nobuflisted? That doesn't not sound
>> right, but a quick test does not show this behaviour.
>>
>> So please provide exact steps that do this and show exactly what you
>> expect and what happens.
>>
>> Best,
>> Christian
>> --
>> Ein Blitzableiter auf einem Kirchturm ist das denkbar stärkste
>> Mißtrauensvotum gegen den lieben Gott.
>> -- Karl Kraus
>
> Hi Karl,
>
> Thanks for your remarks. Following your kind suggestion I have prepared a description below.
>
> A) OVERALL SUMMARY:
> I would like Vim Editor to show all buffers in ':ls' as usual with exception of Vim help buffers, i.e. generated by `:help` or `Ctrl-]`. Only the current active Vim-Help-buffer should be listed, while all other Vim-Help-buffers should be always unlisted. Also the editor should allow user to jump backward and forward as usual again with exception of Vim help buffers; the Vim-help-buffer where jump is active should be listed, while all other Vim-help-buffers should be unlisted.
>
> B) THE OBJECTIVE:
> To write a Vimscript that would make Vim only show the last Vim-Help-buffer as listed and all other Vim-Help-buffers as unlisted. When typing `Ctrl-O` or `Ctrl-T` (and the opposite when typing `Ctrl-I` and `Ctrl-]` in the reverse direction) it should work as usually in Vim, except in case Vim-Help-buffer is the visible/active/current buffer then:
> 1) if previous-buffer-jump is also a Vim-Help-buffer, then `Ctrl-O` or `Ctrl-T` should CHANGE the current Vim-Help-buffer to 'nobuflisted' before jumping to the previous Vim-Help-buffer and once on the previous one it would CHANGE it to 'buflisted'.
> 2) if previous buffer jump was any other NONE-Help-buffer, then `Ctrl-O` or `Ctrl-T` should KEEP the current NONE-Help-buffer as 'buflisted' and once on the previous one it should KEEP it also 'buflisted'.
>
> C) WORK DONE AS OF NOW:
> 1) "~/.vim/after/ftplugin/help.vim" contains:
> set buflisted
>
> 2) "~/.vimrc" contains:
> autocmd BufEnter,BufWinEnter * if &filetype=='help'
> \| only
> \| execute "normal! zi"
> \| let w:bufnuc = bufnr("%")
> \| let w:bufnua = bufnr("#")
> \| if w:bufnua > 0
> \| execute "buffer " . w:bufnua

This is rather strange part.

1. Does not it add jump points?
2. Why do you need to use :buffer *at all*? There is
getbufvar()/setbufvar() pair, which also works for buffer-local
options like &buflisted and &filetype.

Try to rewrite code without switching buffers. Maybe this will fix the issue.

Also note keepjumps command modifier. If you for some reason *do* need
to switch buffers you may use it.

> \| if &filetype=='help'
> \| if w:bufnua != w:bufnuc
> \| set nobuflisted
> \| endif
> \| endif
> \| execute "buffer " . w:bufnuc
> \| endif
> \| endif
>
> The code as specified above keeps the Vim-help-buffers unlisted with only one copy, the current one, listed.
>
> D) PROBLEM REMAINING:
> To write another script that auto-triggers whenever I press `Ctrl-O` or `Ctrl-T` (as well as `Ctrl-I` or `Ctrl-]` for reverse direction) on Vim-help-buffers and which would then follow instructions 1) and 2) in the above Objective.

"To write another script" is not a valid task: you will *never* look
at bugs in your original script with this task. You need to formulate
this as "keep the default behaviour of <C-o>/…, keeping currently
viewed help buffer listed and others unlisted".

>
> I appreciate any suggestions and assistance.
>
> Regards,
> Annis Monadjem
>
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