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|
" Name: detectindent (global plugin)
" Version: 1.0
" Author: Ciaran McCreesh <ciaran.mccreesh at googlemail.com>
" Updates: http://github.com/ciaranm/detectindent
" 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
"
" " To use preferred values instead of guessing:
" :let g:detectindent_preferred_when_mixed = 1
"
" Requirements: Untested on Vim versions below 6.2
if exists("loaded_detectindent")
finish
endif
let loaded_detectindent = 1
if !exists('g:detectindent_verbosity')
let g:detectindent_verbosity = 1
endif
fun! <SID>HasCStyleComments()
return index(["c", "cpp", "java", "javascript", "php", "vala"], &ft) != -1
endfun
fun! <SID>IsCommentStart(line)
" &comments aren't reliable
return <SID>HasCStyleComments() && a:line =~ '/\*'
endfun
fun! <SID>IsCommentEnd(line)
return <SID>HasCStyleComments() && a:line =~ '\*/'
endfun
fun! <SID>IsCommentLine(line)
return <SID>HasCStyleComments() && a:line =~ '^\s\+//'
endfun
fun! s:GetValue(option)
if exists('b:'. a:option)
return get(b:, a:option)
else
return get(g:, a:option)
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:shortest_leading_spaces_idx = 0
let l:longest_leading_spaces_run = 0
let l:max_lines = 1024
if exists("g:detectindent_max_lines_to_analyse")
let l:max_lines = g:detectindent_max_lines_to_analyse
endif
let verbose_msg = ''
if ! exists("b:detectindent_cursettings")
" remember initial values for comparison
let b:detectindent_cursettings = {'expandtab': &et, 'shiftwidth': &sw, 'tabstop': &ts, 'softtabstop': &sts}
endif
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:idx = l:idx + 1
let l:line = getline(l:idx)
endwhile
let l:idx = l:idx + 1
continue
endif
" Skip comment lines since they are not dependable.
if <SID>IsCommentLine(l:line)
let l:idx = l:idx + 1
continue
endif
" Skip lines that are solely whitespace, since they're less likely to
" be properly constructed.
if l:line !~ '\S'
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
let l:shortest_leading_spaces_idx = l:idx
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
let l:max_lines = l:max_lines - 1
if l:max_lines == 0
let l:idx = l:idx_end + 1
endif
endwhile
if l:has_leading_tabs && ! l:has_leading_spaces
" tabs only, no spaces
let l:verbose_msg = "Detected tabs only and no spaces"
setl noexpandtab
if s:GetValue("detectindent_preferred_indent")
let &l:shiftwidth = g:detectindent_preferred_indent
let &l:tabstop = g:detectindent_preferred_indent
endif
elseif l:has_leading_spaces && ! l:has_leading_tabs
" spaces only, no tabs
let l:verbose_msg = "Detected spaces only and no tabs"
setl expandtab
let &l:shiftwidth = l:shortest_leading_spaces_run
let &l:softtabstop = l:shortest_leading_spaces_run
elseif l:has_leading_spaces && l:has_leading_tabs && ! s:GetValue("detectindent_preferred_when_mixed")
" spaces and tabs
let l:verbose_msg = "Detected spaces and tabs"
setl noexpandtab
let &l:shiftwidth = l:shortest_leading_spaces_run
" mmmm, time to guess how big tabs are
if l:longest_leading_spaces_run <= 2
let &l:tabstop = 2
elseif l:longest_leading_spaces_run <= 4
let &l:tabstop = 4
else
let &l:tabstop = 8
endif
else
" no spaces, no tabs
let l:verbose_msg = s:GetValue("detectindent_preferred_when_mixed") ? "preferred_when_mixed is active" : "Detected no spaces and no tabs"
if s:GetValue("detectindent_preferred_indent") &&
\ (s:GetValue("detectindent_preferred_expandtab"))
setl expandtab
let &l:shiftwidth = g:detectindent_preferred_indent
let &l:softtabstop = g:detectindent_preferred_indent
elseif s:GetValue("detectindent_preferred_indent")
setl noexpandtab
let &l:shiftwidth = g:detectindent_preferred_indent
let &l:tabstop = g:detectindent_preferred_indent
elseif s:GetValue("detectindent_preferred_expandtab")
setl expandtab
else
setl noexpandtab
endif
endif
if &verbose >= g:detectindent_verbosity
echo l:verbose_msg
\ ."; has_leading_tabs:" l:has_leading_tabs
\ .", has_leading_spaces:" l:has_leading_spaces
\ .", shortest_leading_spaces_run:" l:shortest_leading_spaces_run
\ .", shortest_leading_spaces_idx:" l:shortest_leading_spaces_idx
\ .", longest_leading_spaces_run:" l:longest_leading_spaces_run
let changed_msg = []
for [setting, oldval] in items(b:detectindent_cursettings)
exec 'let newval = &'.setting
if oldval != newval
let changed_msg += [ setting." changed from ".oldval." to ".newval ]
end
endfor
if len(changed_msg)
echo "Initial buffer settings changed:" join(changed_msg, ", ")
endif
endif
endfun
command! -bar -nargs=0 DetectIndent call <SID>DetectIndent()
|
