1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
|
" 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()
|