Created
April 3, 2012 19:26
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Two useful text objects for coffeescript
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" See http://andrewradev.com/2012/04/03/manipulating-coffeescript-with-vim-part-1-text-objects/ | |
" for details on the implementation | |
onoremap ii :<c-u>call <SID>IndentTextObject()<cr> | |
onoremap аi :<c-u>call <SID>IndentTextObject()<cr> | |
xnoremap ii :<c-u>call <SID>IndentTextObject()<cr> | |
xnoremap ai :<c-u>call <SID>IndentTextObject()<cr> | |
function! s:IndentTextObject() | |
let upper = s:UpperIndentLimit(line('.')) | |
let lower = s:LowerIndentLimit(line('.')) | |
call s:MarkVisual('V', upper, lower) | |
endfunction | |
onoremap if :<c-u>call <SID>FunctionTextObject('i')<cr> | |
onoremap af :<c-u>call <SID>FunctionTextObject('a')<cr> | |
xnoremap if :<c-u>call <SID>FunctionTextObject('i')<cr> | |
xnoremap af :<c-u>call <SID>FunctionTextObject('a')<cr> | |
function! s:FunctionTextObject(type) | |
let function_start = search('\((.\{-})\)\=\s*[-=]>$', 'Wbc') | |
if function_start <= 0 | |
return | |
endif | |
let body_start = function_start + 1 | |
if body_start > line('$') || indent(nextnonblank(body_start)) <= indent(function_start) | |
if a:type == 'a' | |
normal! vg_ | |
endif | |
return | |
endif | |
let indent_limit = s:LowerIndentLimit(body_start) | |
if a:type == 'i' | |
let start = body_start | |
else | |
let start = function_start | |
endif | |
call s:MarkVisual('v', start, indent_limit) | |
endfunction | |
function! s:LowerIndentLimit(lineno) | |
let base_indent = indent(a:lineno) | |
let current_line = a:lineno | |
let next_line = nextnonblank(current_line + 1) | |
while current_line < line('$') && indent(next_line) >= base_indent | |
let current_line = next_line | |
let next_line = nextnonblank(current_line + 1) | |
endwhile | |
return current_line | |
endfunction | |
function! s:UpperIndentLimit(lineno) | |
let base_indent = indent(a:lineno) | |
let current_line = a:lineno | |
let prev_line = prevnonblank(current_line - 1) | |
while current_line > 0 && indent(prev_line) >= base_indent | |
let current_line = prev_line | |
let prev_line = prevnonblank(current_line - 1) | |
endwhile | |
return current_line | |
endfunction | |
function! s:MarkVisual(command, start_line, end_line) | |
if a:start_line != line('.') | |
exe a:start_line | |
endif | |
if a:end_line > a:start_line | |
exe 'normal! '.a:command.(a:end_line - a:start_line).'jg_' | |
else | |
exe 'normal! '.a:command.'g_' | |
endif | |
endfunction |
Thanks for the explanation. I'll go reading the blog post ;)
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To me, the interesting thing about the gist is the implementation -- it's fairly simple to build something useful like this on your own (it's a part of a blog post, where I explain it in a lot more detail). For an actual, battle-tested indent text object, I'm pretty sure Kana's plugin works better :). The function object is something a bit different that might be useful, though.