On 11/14/2010 04:42 AM, rameo wrote:
I would like to do this with a map (let say CTRL-K) and cycle through
a number of filetypes settings, p.e.:
1st CTRL-K --> set filetype=vim
2nd CTRL-K --> set filetype=html
3rd CTRL-K --> set filetype=txt
4th CTRL-K --> set filetype= (empty)
I know that I need an array to do this but I do not know how to cycle
through the array using a map.
Not too hard. First, set up the array of various filetypes you want:
:let types=['vim', 'html', 'txt', '']
Then create a mapping to update the value of 'filetype' to the
next item in the list with wraparound:
:nnoremap <f4> :let &ft=types[(index(types, &ft) + 1) %
len(types)]<cr>:set ft?<cr>
That uses the index() function to look up the current type. If
it exists, an index of 0 to len(types)-1 is returned. Add 1 to
that. The "% len(types)" performs modulo arithmetic so that when
you hit the end (the blank value in this case) the index+1 rolls
back to 0.
I also include reporting of the new value to make it clearer...if
you don't want that, you can remove the trailing ":set ft?<cr>"
bit of the mapping.
Hope this helps,
-tim
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