So, I've never done any Vim scripting before, but based on this question about doing something similar in C and this tip for checking if you're currently in a comment, I've hacked together a solution.
By default, this uses the PEP8-suggested widths of 79 characters for normal lines and 72 characters for comments, but you can override them by let
ting g:python_normal_text_width
or g:python_comment_text_width
variables, respectively. (Personally, I wrap normal lines at 78 characters.)
Drop this baby in your .vimrc and you should be good to go. I may package this up as a plugin later.
function! GetPythonTextWidth()
if !exists('g:python_normal_text_width')
let normal_text_width = 79
else
let normal_text_width = g:python_normal_text_width
endif
if !exists('g:python_comment_text_width')
let comment_text_width = 72
else
let comment_text_width = g:python_comment_text_width
endif
let cur_syntax = synIDattr(synIDtrans(synID(line("."), col("."), 0)), "name")
if cur_syntax == "Comment"
return comment_text_width
elseif cur_syntax == "String"
" Check to see if we're in a docstring
let lnum = line(".")
while lnum >= 1 && synIDattr(synIDtrans(synID(lnum, col([lnum, "$"]) - 1, 0)), "name") == "String"
if match(getline(lnum), "\\('''\\|\"\"\"\\)") > -1
" Assume that any longstring is a docstring
return comment_text_width
endif
let lnum -= 1
endwhile
endif
return normal_text_width
endfunction
augroup pep8
au!
autocmd CursorMoved,CursorMovedI * :if &ft == 'python' | :exe 'setlocal textwidth='.GetPythonTextWidth() | :endif
augroup END