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-rw-r--r--autoload/xolox/easytags.vim37
1 files changed, 35 insertions, 2 deletions
diff --git a/autoload/xolox/easytags.vim b/autoload/xolox/easytags.vim
index 2088f48..0d6e857 100644
--- a/autoload/xolox/easytags.vim
+++ b/autoload/xolox/easytags.vim
@@ -99,8 +99,11 @@ function! xolox#easytags#update(silent, filter_tags, filenames) " {{{2
let tagsfile = xolox#easytags#get_tagsfile()
let firstrun = !filereadable(tagsfile)
let cmdline = s:prep_cmdline(cfile, tagsfile, firstrun, a:filenames, context)
- let output = s:run_ctags(starttime, cfile, tagsfile, firstrun, cmdline)
+ let [output, has_updates] = s:run_ctags(starttime, cfile, tagsfile, firstrun, cmdline)
if !firstrun
+ if !has_updates
+ return 1
+ endif
if have_args && !empty(g:easytags_by_filetype)
" TODO Get the headers from somewhere?!
call s:save_by_filetype(a:filter_tags, [], output, context)
@@ -201,12 +204,41 @@ function! s:prep_cmdline(cfile, tagsfile, firstrun, arguments, context) " {{{3
return have_args ? join(cmdline) : ''
endfunction
+if exists('*sha256')
+function! s:get_fingerprint(cfile, output)
+ return sha256(a:output)
+endfunction
+else
+function! s:get_fingerprint(cfile, output)
+ " Don't want to re-implement a costly hashing function in Vimscript. Just
+ " handle files that never had any tags.
+ if empty(a:output)
+ return get(s:fingerprints, a:cfile, 1)
+ else
+ return ''
+ endif
+endfunction
+endif
+
+let s:fingerprints = {}
+function! s:has_updates(cfile, output)
+ let fingerprint = s:get_fingerprint(a:cfile, a:output)
+ if ! empty(fingerprint) && get(s:fingerprints, a:cfile, '') ==# fingerprint
+ return 0
+ endif
+
+ let s:fingerprints[a:cfile] = fingerprint
+ return 1
+endfunction
+
function! s:run_ctags(starttime, cfile, tagsfile, firstrun, cmdline) " {{{3
let lines = []
+ let has_updates = 1
if a:cmdline != ''
call xolox#misc#msg#debug("easytags.vim %s: Executing %s.", g:xolox#easytags#version, a:cmdline)
try
let lines = xolox#shell#execute(a:cmdline, 1)
+ let has_updates = a:firstrun || s:has_updates(a:cfile, join(lines, "\n"))
catch /^Vim\%((\a\+)\)\=:E117/
" Ignore missing shell.vim plug-in.
let output = system(a:cmdline)
@@ -215,6 +247,7 @@ function! s:run_ctags(starttime, cfile, tagsfile, firstrun, cmdline) " {{{3
throw printf(msg, fnamemodify(a:tagsfile, ':~'), strtrans(output))
endif
let lines = split(output, "\n")
+ let has_updates = a:firstrun || s:has_updates(a:cfile, output)
endtry
if a:firstrun
if a:cfile != ''
@@ -225,7 +258,7 @@ function! s:run_ctags(starttime, cfile, tagsfile, firstrun, cmdline) " {{{3
return []
endif
endif
- return xolox#easytags#parse_entries(lines)
+ return [xolox#easytags#parse_entries(lines), has_updates]
endfunction
function! s:filter_merge_tags(filter_tags, tagsfile, output, context) " {{{3