Re: vim: map a key to "conditionally" override built-in behavior

ping <songpingemail@gmail.com> a écrit:
> this looks weird at first glance.
> but sometime, I want to give the existing keystroke (like 'h') a new
> behavior, at a very certain circumstance.
> for example, if you use ranger (file manager), by default it will end up
> with opening the text file in vim, if you keep press "l" towards the
> file. now you disconnect (temporarily ) with range and you are with vim.
> then to go back you have to type vim's keystroke (:q) to exit vim and
> turn control back to ranger.
>
> I'm thinking if I want to make it real consistent , I need to have a "h"
> key that can exit vim and go back to ranger, just opposite what a "l"
> key does in ranger.
> but if I map it (absolute map) this way:
>
> map h :q
>
> it will be obviously a disaster.
>
> so , how can I map the 'h', to ":q", if , and only if, say, my cursor is
> in the left/top corner of the file?

You can use <expr> to define a mapping with a function:

function! <SID>Map()
if line(".") == 1 && wincol(".") == 1
return ":q\r"
else
return "h"
endif
endfunction

nnoremap <expr> h <SID>Map()

If you meant the "topleft corner of the window" rather than "of the
file", replace "line(".")" with "winline()" and "col(".")" with
"wincol()". However, the latter might be surprising because it takes
into account the width of the linenumbers column (if you use it),
which you can factor out with "numberwidth":

function! <SID>Map()
if winline() == 1 && wincol() - (&number ? &numberwidth : 0) == 1
return ":q\r"
else
return "h"
endif
endfunction

Best,
Paul

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