Does anyone know of a way to teach vim that C sources in a python checkout
should have 4-space indents without changing the defaults for other C files?
I use this in my vimrc:
"----------------------------------------------------------------------------"
" indentation: use detectindent plugin if possible
"----------------------------------------------------------------------------"
set autoindent
set smartindent
try
let g:detectindent_preferred_expandtab = 1
let g:detectindent_preferred_tabsize = 8
let g:detectindent_preferred_indent = 4
source $VIMRUNTIME/plugin/detectindent.vim
au BufNewFile,BufRead * .* DetectIndent
catch
set smarttab
set expandtab
set tabstop=8
set shiftwidth=4
set softtabstop=4
set textwidth=80
endtry
*** And this is plugin/detectindent.vim:
" Name: detectindent (global plugin)
" Version: 1.0
" Author: Ciaran McCreesh <ciaranm at gentoo.org>
" Updates: http://dev.gentoo.org/~ciaranm/vim/
" Purpose: Detect file indent settings
"
" License: You may redistribute this plugin under the same terms
as Vim
" itself.
"
" Usage: :DetectIndent
"
" " to prefer expandtab to noexpandtab when detection is
" " impossible:
" :let g:detectindent_preferred_expandtab = 1
"
" " to set a preferred indent level when detection is
" " impossible:
" :let g:detectindent_preferred_indent = 4
"
" Requirements: Untested on Vim versions below 6.2
fun! <SID>IsCommentStart(line)
" &comments isn't reliable
if &ft == "c" || &ft == "cpp"
return -1 != match(a:line, '/\*')
else
return 0
endif
endfun
fun! <SID>IsCommentEnd(line)
if &ft == "c" || &ft == "cpp"
return -1 != match(a:line, '\*/')
else
return 0
endif
endfun
fun! <SID>DetectIndent()
let l:has_leading_tabs = 0
let l:has_leading_spaces = 0
let l:shortest_leading_spaces_run = 0
let l:longest_leading_spaces_run = 0
let l:idx_end = line("$")
let l:idx = 1
while l:idx <= l:idx_end
let l:line = getline(l:idx)
" try to skip over comment blocks, they can give really screwy
indent
" settings in c/c++ files especially
if <SID>IsCommentStart(l:line)
while l:idx <= l:idx_end && ! <SID>IsCommentEnd(l:line)
let l:line = getline(l:idx)
let l:idx = l:idx + 1
endwhile
let l:idx = l:idx + 1
continue
endif
let l:leading_char = strpart(l:line, 0, 1)
if l:leading_char == "\t"
let l:has_leading_tabs = 1
elseif l:leading_char == " "
" only interested if we don't have a run of spaces followed
by a
" tab.
if -1 == match(l:line, '^ \+\t')
let l:has_leading_spaces = 1
let l:spaces = strlen(matchstr(l:line, '^ \+'))
if l:shortest_leading_spaces_run == 0 ||
\ l:spaces < l:shortest_leading_spaces_run
let l:shortest_leading_spaces_run = l:spaces
endif
if l:spaces > l:longest_leading_spaces_run
let l:longest_leading_spaces_run = l:spaces
endif
endif
endif
let l:idx = l:idx + 1
endwhile
if l:has_leading_tabs && ! l:has_leading_spaces
" tabs only, no spaces
set noexpandtab
if exists("g:detectindent_preferred_tabsize")
let &shiftwidth = g:detectindent_preferred_indent
let &tabstop = g:detectindent_preferred_indent
endif
elseif l:has_leading_spaces && ! l:has_leading_tabs
" spaces only, no tabs
set expandtab
let &shiftwidth = l:shortest_leading_spaces_run
elseif l:has_leading_spaces && l:has_leading_tabs
" spaces and tabs
set noexpandtab
let &shiftwidth = l:shortest_leading_spaces_run
" mmmm, time to guess how big tabs are
if l:longest_leading_spaces_run < 2
let &tabstop = 2
elseif l:longest_leading_spaces_run < 4
let &tabstop = 4
else
let &tabstop = 8
endif
else
" no spaces, no tabs
if exists("g:detectindent_preferred_tabsize")
let &shiftwidth = g:detectindent_preferred_indent
let &tabstop = g:detectindent_preferred_indent
endif
if exists("g:detectindent_preferred_expandtab")
set expandtab
endif
endif
endfun
command! -nargs=0 DetectIndent call <SID>DetectIndent()
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