Re: vim: help for scripting

On 22:45 Wed 06 Feb , ping wrote:
> On 2/6/2013 5:39 PM, Marcin Szamotulski wrote:
> > 1) use map <cr> to find out whether the mapping already
> > >exist when you run the code.
> I got "no mapping found"
> > >2) lookup how the the Voom plugin does map <CR> to a key.
> > >There is no python magic - all mappings are done in Vim - so you're
> > >likely to be wrong about assuming its related to python.
> I agree now that I'm wrong on that.
> so I got these from the plugin code:
>
> " Which key to map to Select-Node-and-Shuttle-between-Body/Tree
> if !exists('g:voom_return_key')
> let g:voom_return_key = '<Return>'
> endif
>
> ......
>
> exe "nnoremap <buffer><silent> ".g:voom_return_key." :<C-u>call
> Voom_TreeSelect(0)<CR>"
> exe "vnoremap <buffer><silent> ".g:voom_return_key." <Esc>:<C-u>call
> Voom_TreeSelect(0)<CR>"
> "exe "vnoremap <buffer><silent> ".g:voom_return_key." <Nop>"
> exe "nnoremap <buffer><silent> ".g:voom_tab_key." :<C-u>call
> Voom_ToTreeOrBodyWin()<CR>"
> exe "vnoremap <buffer><silent> ".g:voom_tab_key." <Esc>:<C-u>call
> Voom_ToTreeOrBodyWin()<CR>"
> "exe "vnoremap <buffer><silent> ".g:voom_tab_key." <Nop>"
>
> > >
> > >grep the plugin code for CR and cr and you'll be lucky. Then try using
> > >the right hand side instead of sendig <cr> - you may get more helpful
> > >error messages then.
> this is a bit complex kind of map... so based on that , how can I make a
> jump within my script?
> I tried:
> exec "<C-u>call Voom_TreeSelect(0)<CR>"
>
> it seems not work:
>
> Error detected while processing function QuitNR:
> line 11:
> E488: Trailing characters: <C-u>call Voom_TreeSelect(0)<CR>
> Press ENTER or type command to continue
>
>
> thanks.
To call a function it is enough to write:

call VoomTreeSelect(0)

in you vimscript. However if you want to use :execute command (but you
don't need to):

exe 'call VoomTreeSelect(0)'

Both <c-u> and <cr> are not needed. An example of a usage of <c-u> and
<cr> is when you define a map via :exe :

exe 'map E :<C-U>call VoomTreeSelect(0)<CR>'

and I presume you took your syntax from here. The difference is that
the right hand side of a map is not the same as what exe statement is
using. :exe executes expressions as an Ex command while the right hand
side of a map is a bunch of normal commands, where ':' is used to enter
the command line. If you enter it in the visual mode, then it will
start with range '<,>' and <c-u> is used to delete it.

Best,
Marcin

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