Mercurial > vim-gutentags
annotate plugin/autotags.vim @ 15:b557282af215
Fix race condition between the statusline and the lock file.
| author | Ludovic Chabant <ludovic@chabant.com> |
|---|---|
| date | Tue, 29 Jul 2014 16:11:24 -0700 |
| parents | b8f23bf7b20f |
| children | c11616828595 |
| rev | line source |
|---|---|
| 0 | 1 " autotags.vim - Automatic ctags management for Vim |
| 2 " Maintainer: Ludovic Chabant <http://ludovic.chabant.com> | |
| 3 " Version: 0.0.1 | |
| 4 | |
| 5 " Globals {{{ | |
| 6 | |
| 7 if !exists('g:autotags_debug') | |
| 8 let g:autotags_debug = 0 | |
| 9 endif | |
| 10 | |
| 11 if (exists('g:loaded_autotags') || &cp) && !g:autotags_debug | |
| 12 finish | |
| 13 endif | |
| 14 if (exists('g:loaded_autotags') && g:autotags_debug) | |
| 15 echom "Reloaded autotags." | |
| 16 endif | |
| 17 let g:loaded_autotags = 1 | |
| 18 | |
| 19 if !exists('g:autotags_trace') | |
| 3 | 20 let g:autotags_trace = 0 |
| 0 | 21 endif |
| 22 | |
| 23 if !exists('g:autotags_fake') | |
| 24 let g:autotags_fake = 0 | |
| 25 endif | |
| 26 | |
| 27 if !exists('g:autotags_background_update') | |
| 28 let g:autotags_background_update = 1 | |
| 29 endif | |
| 30 | |
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31 if !exists('g:autotags_pause_after_update') |
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32 let g:autotags_pause_after_update = 0 |
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33 endif |
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34 |
| 0 | 35 if !exists('g:autotags_enabled') |
| 36 let g:autotags_enabled = 1 | |
| 37 endif | |
| 38 | |
| 39 if !exists('g:autotags_executable') | |
| 40 let g:autotags_executable = 'ctags' | |
| 41 endif | |
| 42 | |
| 43 if !exists('g:autotags_tagfile') | |
| 44 let g:autotags_tagfile = 'tags' | |
| 45 endif | |
| 46 | |
| 47 if !exists('g:autotags_project_root') | |
| 48 let g:autotags_project_root = [] | |
| 49 endif | |
| 50 let g:autotags_project_root += ['.git', '.hg', '.bzr', '_darcs'] | |
| 51 | |
| 3 | 52 if !exists('g:autotags_exclude') |
| 53 let g:autotags_exclude = [] | |
| 54 endif | |
| 55 | |
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56 if !exists('g:autotags_generate_on_new') |
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57 let g:autotags_generate_on_new = 1 |
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58 endif |
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59 |
| 3 | 60 if !exists('g:autotags_generate_on_missing') |
| 61 let g:autotags_generate_on_missing = 1 | |
| 62 endif | |
| 63 | |
| 64 if !exists('g:autotags_generate_on_write') | |
| 65 let g:autotags_generate_on_write = 1 | |
| 66 endif | |
| 67 | |
| 68 if !exists('g:autotags_auto_set_tags') | |
| 69 let g:autotags_auto_set_tags = 1 | |
| 70 endif | |
| 71 | |
| 0 | 72 " }}} |
| 73 | |
| 74 " Utilities {{{ | |
| 75 | |
| 76 " Throw an exception message. | |
| 77 function! s:throw(message) | |
| 78 let v:errmsg = "autotags: " . a:message | |
| 79 throw v:errmsg | |
| 80 endfunction | |
| 81 | |
| 82 " Prints a message if debug tracing is enabled. | |
| 83 function! s:trace(message, ...) | |
| 84 if g:autotags_trace || (a:0 && a:1) | |
| 85 let l:message = "autotags: " . a:message | |
| 86 echom l:message | |
| 87 endif | |
| 88 endfunction | |
| 89 | |
| 90 " Strips the ending slash in a path. | |
| 91 function! s:stripslash(path) | |
| 92 return fnamemodify(a:path, ':s?[/\\]$??') | |
| 93 endfunction | |
| 94 | |
| 95 " Normalizes the slashes in a path. | |
| 96 function! s:normalizepath(path) | |
| 97 if exists('+shellslash') && &shellslash | |
| 98 return substitute(a:path, '\v/', '\\', 'g') | |
| 99 elseif has('win32') | |
| 100 return substitute(a:path, '\v/', '\\', 'g') | |
| 101 else | |
| 102 return a:path | |
| 103 endif | |
| 104 endfunction | |
| 105 | |
| 106 " Shell-slashes the path (opposite of `normalizepath`). | |
| 107 function! s:shellslash(path) | |
| 108 if exists('+shellslash') && !&shellslash | |
| 109 return substitute(a:path, '\v\\', '/', 'g') | |
| 110 else | |
| 111 return a:path | |
| 112 endif | |
| 113 endfunction | |
| 114 | |
| 115 " }}} | |
| 116 | |
| 117 " Autotags Setup {{{ | |
| 118 | |
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119 let s:known_tagfiles = [] |
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120 |
| 0 | 121 " Finds the tag file path for the given current directory |
| 122 " (typically the directory of the file being edited) | |
| 123 function! s:get_tagfile_for(path) abort | |
| 124 let l:path = s:stripslash(a:path) | |
| 125 let l:previous_path = "" | |
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126 let l:markers = g:autotags_project_root[:] |
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127 if exists('g:ctrlp_root_markers') |
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128 let l:markers += g:ctrlp_root_markers |
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129 endif |
| 0 | 130 while l:path != l:previous_path |
| 131 for root in g:autotags_project_root | |
| 132 if getftype(l:path . '/' . root) != "" | |
| 133 return simplify(fnamemodify(l:path, ':p') . g:autotags_tagfile) | |
| 134 endif | |
| 135 endfor | |
| 136 let l:previous_path = l:path | |
| 137 let l:path = fnamemodify(l:path, ':h') | |
| 138 endwhile | |
| 139 call s:throw("Can't figure out what tag file to use for: " . a:path) | |
| 140 endfunction | |
| 141 | |
| 142 " Setup autotags for the current buffer. | |
| 143 function! s:setup_autotags() abort | |
| 3 | 144 if exists('b:autotags_file') && !g:autotags_debug |
| 145 " This buffer already has autotags support. | |
| 0 | 146 return |
| 147 endif | |
| 3 | 148 |
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149 " Try and find what tags file we should manage. |
| 3 | 150 call s:trace("Scanning buffer '" . bufname('%') . "' for autotags setup...") |
| 0 | 151 try |
| 152 let b:autotags_file = s:get_tagfile_for(expand('%:h')) | |
| 153 catch /^autotags\:/ | |
| 3 | 154 call s:trace("Can't figure out what tag file to use... no autotags support.") |
| 0 | 155 return |
| 156 endtry | |
| 157 | |
| 3 | 158 " We know what tags file to manage! Now set things up. |
| 0 | 159 call s:trace("Setting autotags for buffer '" . bufname('%') . "' with tagfile: " . b:autotags_file) |
| 160 | |
| 3 | 161 " Set the tags file for Vim to use. |
| 162 if g:autotags_auto_set_tags | |
| 163 execute 'setlocal tags^=' . b:autotags_file | |
| 164 endif | |
| 165 | |
| 166 " Autocommands for updating the tags on save. | |
| 0 | 167 let l:bn = bufnr('%') |
| 168 execute 'augroup autotags_buffer_' . l:bn | |
| 169 execute ' autocmd!' | |
| 3 | 170 execute ' autocmd BufWritePost <buffer=' . l:bn . '> call s:write_triggered_update_tags()' |
| 0 | 171 execute 'augroup end' |
| 172 | |
| 3 | 173 " Miscellaneous commands. |
| 0 | 174 command! -buffer -bang AutotagsUpdate :call s:manual_update_tags(<bang>0) |
| 3 | 175 |
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176 " Add this tags file to the known tags files if it wasn't there already. |
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177 let l:found = index(s:known_tagfiles, b:autotags_file) |
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178 if l:found < 0 |
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179 call add(s:known_tagfiles, b:autotags_file) |
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180 |
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181 " Generate this new file depending on settings and stuff. |
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182 if g:autotags_generate_on_missing && !filereadable(b:autotags_file) |
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183 call s:trace("Generating missing tags file: " . b:autotags_file) |
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184 call s:update_tags(1, 0) |
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185 elseif g:autotags_generate_on_new |
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186 call s:trace("Generating tags file: " . b:autotags_file) |
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187 call s:update_tags(1, 0) |
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188 endif |
| 3 | 189 endif |
| 0 | 190 endfunction |
| 191 | |
| 192 augroup autotags_detect | |
| 193 autocmd! | |
| 194 autocmd BufNewFile,BufReadPost * call s:setup_autotags() | |
| 195 autocmd VimEnter * if expand('<amatch>')==''|call s:setup_autotags()|endif | |
| 196 augroup end | |
| 197 | |
| 198 " }}} | |
| 199 | |
| 200 " Tags File Management {{{ | |
| 201 | |
| 202 let s:runner_exe = expand('<sfile>:h:h') . '/plat/unix/update_tags.sh' | |
| 203 if has('win32') | |
| 204 let s:runner_exe = expand('<sfile>:h:h') . '\plat\win32\update_tags.cmd' | |
| 205 endif | |
| 206 | |
| 207 let s:update_queue = [] | |
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208 let s:maybe_in_progress = {} |
| 0 | 209 |
| 210 " Get how to execute an external command depending on debug settings. | |
| 211 function! s:get_execute_cmd() abort | |
| 212 if has('win32') | |
| 213 let l:cmd = '!start ' | |
| 214 if g:autotags_background_update | |
| 215 let l:cmd .= '/b ' | |
| 216 endif | |
| 217 return l:cmd | |
| 218 else | |
| 219 return '!' | |
| 220 endif | |
| 221 endfunction | |
| 222 | |
| 3 | 223 " Get the suffix for how to execute an external command. |
| 224 function! s:get_execute_cmd_suffix() abort | |
| 225 if has('win32') | |
| 226 return '' | |
| 227 else | |
| 228 return ' &' | |
| 229 endif | |
| 230 endfunction | |
| 231 | |
| 0 | 232 " (Re)Generate the tags file for the current buffer's file. |
| 233 function! s:manual_update_tags(bang) abort | |
| 234 call s:update_tags(a:bang, 0) | |
| 235 endfunction | |
| 236 | |
| 3 | 237 " (Re)Generate the tags file for a buffer that just go saved. |
| 238 function! s:write_triggered_update_tags() abort | |
| 239 if g:autotags_enabled && g:autotags_generate_on_write | |
| 240 call s:update_tags(0, 1) | |
| 241 endif | |
| 242 endfunction | |
| 243 | |
| 0 | 244 " Update the tags file for the current buffer's file. |
| 245 " write_mode: | |
| 246 " 0: update the tags file if it exists, generate it otherwise. | |
| 247 " 1: always generate (overwrite) the tags file. | |
| 248 " | |
| 249 " queue_mode: | |
| 250 " 0: if an update is already in progress, report it and abort. | |
| 251 " 1: if an update is already in progress, queue another one. | |
| 252 " | |
| 253 " An additional argument specifies where to write the tags file. If nothing | |
| 254 " is specified, it will go to the autotags-defined file. | |
| 255 function! s:update_tags(write_mode, queue_mode, ...) abort | |
| 256 " Figure out where to save. | |
| 257 if a:0 == 1 | |
| 258 let l:tags_file = a:1 | |
| 259 else | |
| 260 let l:tags_file = b:autotags_file | |
| 261 endif | |
| 262 | |
| 263 " Check that there's not already an update in progress. | |
| 264 let l:lock_file = l:tags_file . '.lock' | |
| 265 if filereadable(l:lock_file) | |
| 266 if a:queue_mode == 1 | |
| 267 let l:idx = index(s:update_queue, l:tags_file) | |
| 268 if l:idx < 0 | |
| 269 call add(s:update_queue, l:tags_file) | |
| 270 endif | |
| 271 call s:trace("Tag file '" . l:tags_file . "' is already being updated. Queuing it up...") | |
| 272 call s:trace("") | |
| 273 else | |
| 274 echom "autotags: The tags file is already being updated, please try again later." | |
| 275 echom "" | |
| 276 endif | |
| 277 return | |
| 278 endif | |
| 279 | |
| 280 " Switch to the project root to make the command line smaller, and make | |
| 281 " it possible to get the relative path of the filename to parse if we're | |
| 282 " doing an incremental update. | |
| 283 let l:prev_cwd = getcwd() | |
| 284 let l:work_dir = fnamemodify(l:tags_file, ':h') | |
| 285 execute "chdir " . l:work_dir | |
| 286 | |
| 287 try | |
| 288 " Build the command line. | |
| 289 let l:cmd = s:get_execute_cmd() . s:runner_exe | |
| 3 | 290 let l:cmd .= ' -e "' . g:autotags_executable . '"' |
| 291 let l:cmd .= ' -t "' . fnamemodify(l:tags_file, ':t') . '"' | |
| 0 | 292 if a:write_mode == 0 && filereadable(l:tags_file) |
| 293 " CTags specifies paths relative to the tags file with a `./` | |
| 294 " prefix, so we need to specify the same prefix otherwise it will | |
| 295 " think those are different files and we'll end up with duplicate | |
| 296 " entries. | |
| 297 let l:rel_path = s:normalizepath('./' . expand('%:.')) | |
| 3 | 298 let l:cmd .= ' -s "' . l:rel_path . '"' |
| 0 | 299 endif |
| 3 | 300 for ign in split(&wildignore, ',') |
| 301 let l:cmd .= ' -x ' . ign | |
| 302 endfor | |
| 303 for exc in g:autotags_exclude | |
| 304 let l:cmd .= ' -x ' . exc | |
| 305 endfor | |
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306 if g:autotags_pause_after_update |
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307 let l:cmd .= ' -p' |
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308 endif |
| 0 | 309 if g:autotags_trace |
| 3 | 310 if has('win32') |
| 311 let l:cmd .= ' -l "' . fnamemodify(l:tags_file, ':t') . '.log"' | |
| 312 else | |
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313 let l:cmd .= ' > "' . fnamemodify(l:tags_file, ':t') . '.log" 2>&1' |
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314 endif |
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315 else |
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316 if !has('win32') |
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317 let l:cmd .= ' > /dev/null 2>&1' |
| 3 | 318 endif |
| 0 | 319 endif |
| 3 | 320 let l:cmd .= s:get_execute_cmd_suffix() |
| 321 | |
| 0 | 322 call s:trace("Running: " . l:cmd) |
| 323 call s:trace("In: " . l:work_dir) | |
| 324 if !g:autotags_fake | |
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325 " Run the background process. |
| 0 | 326 if !g:autotags_trace |
| 327 silent execute l:cmd | |
| 328 else | |
| 329 execute l:cmd | |
| 330 endif | |
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331 |
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332 " Flag this tags file as being in progress |
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333 let l:full_tags_file = fnamemodify(l:tags_file, ':p') |
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334 let s:maybe_in_progress[l:full_tags_file] = localtime() |
| 0 | 335 else |
| 336 call s:trace("(fake... not actually running)") | |
| 337 endif | |
| 338 call s:trace("") | |
| 339 finally | |
| 340 " Restore the current directory... | |
| 341 execute "chdir " . l:prev_cwd | |
| 342 endtry | |
| 343 endfunction | |
| 344 | |
| 345 " }}} | |
| 346 | |
| 347 " Manual Tagfile Generation {{{ | |
| 348 | |
| 349 function! s:generate_tags(bang, ...) abort | |
| 350 call s:update_tags(1, 0, a:1) | |
| 351 endfunction | |
| 352 | |
| 353 command! -bang -nargs=1 -complete=file AutotagsGenerate :call s:generate_tags(<bang>0, <f-args>) | |
| 354 | |
| 355 " }}} | |
| 356 | |
| 3 | 357 " Toggles and Miscellaneous Commands {{{ |
| 0 | 358 |
| 359 command! AutotagsToggleEnabled :let g:autotags_enabled=!g:autotags_enabled | |
| 360 command! AutotagsToggleTrace :call autotags#trace() | |
| 361 command! AutotagsUnlock :call delete(b:autotags_file . '.lock') | |
| 362 | |
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363 if g:autotags_debug |
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364 command! AutotagsToggleFake :call autotags#fake() |
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b853ad0e7afd
Only define `:AutotagsToggleFake` if debug mode is on.
Ludovic Chabant <ludovic@chabant.com>
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365 endif |
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b853ad0e7afd
Only define `:AutotagsToggleFake` if debug mode is on.
Ludovic Chabant <ludovic@chabant.com>
parents:
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366 |
| 0 | 367 " }}} |
| 368 | |
| 369 " Autoload Functions {{{ | |
| 370 | |
| 371 function! autotags#rescan(...) | |
| 372 if exists('b:autotags_file') | |
| 373 unlet b:autotags_file | |
| 374 endif | |
| 375 if a:0 && a:1 | |
| 376 let l:trace_backup = g:autotags_trace | |
| 377 let l:autotags_trace = 1 | |
| 378 endif | |
| 379 call s:setup_autotags() | |
| 380 if a:0 && a:1 | |
| 381 let g:autotags_trace = l:trace_backup | |
| 382 endif | |
| 383 endfunction | |
| 384 | |
| 385 function! autotags#trace(...) | |
| 386 let g:autotags_trace = !g:autotags_trace | |
| 387 if a:0 > 0 | |
| 388 let g:autotags_trace = a:1 | |
| 389 endif | |
| 390 if g:autotags_trace | |
| 391 echom "autotags: Tracing is enabled." | |
| 392 else | |
| 393 echom "autotags: Tracing is disabled." | |
| 394 endif | |
| 395 echom "" | |
| 396 endfunction | |
| 397 | |
| 398 function! autotags#fake(...) | |
| 399 let g:autotags_fake = !g:autotags_fake | |
| 400 if a:0 > 0 | |
| 401 let g:autotags_fake = a:1 | |
| 402 endif | |
| 403 if g:autotags_fake | |
| 404 echom "autotags: Now faking autotags." | |
| 405 else | |
| 406 echom "autotags: Now running autotags for real." | |
| 407 endif | |
| 408 echom "" | |
| 409 endfunction | |
| 410 | |
| 3 | 411 function! autotags#inprogress() |
| 412 echom "autotags: generations in progress:" | |
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Fix race condition between the statusline and the lock file.
Ludovic Chabant <ludovic@chabant.com>
parents:
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413 for mip in keys(s:maybe_in_progress) |
| 3 | 414 echom mip |
| 415 endfor | |
| 416 echom "" | |
| 417 endfunction | |
| 418 | |
| 0 | 419 " }}} |
| 420 | |
| 3 | 421 " Statusline Functions {{{ |
| 422 | |
| 423 " Prints whether a tag file is being generated right now for the current | |
| 424 " buffer in the status line. | |
| 425 " | |
| 426 " Arguments can be passed: | |
| 427 " - args 1 and 2 are the prefix and suffix, respectively, of whatever output, | |
| 428 " if any, is going to be produced. | |
| 429 " (defaults to empty strings) | |
| 430 " - arg 3 is the text to be shown if tags are currently being generated. | |
| 431 " (defaults to 'TAGS') | |
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parents:
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432 |
| 3 | 433 function! autotags#statusline(...) abort |
| 434 if !exists('b:autotags_file') | |
| 435 " This buffer doesn't have autotags. | |
| 436 return '' | |
| 437 endif | |
| 438 | |
| 439 " Figure out what the user is customizing. | |
| 440 let l:gen_msg = 'TAGS' | |
| 441 if a:0 >= 0 | |
| 442 let l:gen_msg = a:1 | |
| 443 endif | |
| 444 | |
| 445 " To make this function as fast as possible, we first check whether the | |
| 446 " current buffer's tags file is 'maybe' being generated. This provides a | |
| 447 " nice and quick bail out for 99.9% of cases before we need to this the | |
| 448 " file-system to check the lock file. | |
| 449 let l:abs_tag_file = fnamemodify(b:autotags_file, ':p') | |
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parents:
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450 let l:timestamp = get(s:maybe_in_progress, l:abs_tag_file) |
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parents:
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451 if l:timestamp == 0 |
| 3 | 452 return '' |
| 453 endif | |
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parents:
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454 " It's maybe generating! Check if the lock file is still there... but |
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Fix race condition between the statusline and the lock file.
Ludovic Chabant <ludovic@chabant.com>
parents:
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455 " don't do it too soon after the script was originally launched, because |
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Fix race condition between the statusline and the lock file.
Ludovic Chabant <ludovic@chabant.com>
parents:
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456 " there can be a race condition where we get here just before the script |
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Fix race condition between the statusline and the lock file.
Ludovic Chabant <ludovic@chabant.com>
parents:
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457 " had a chance to write the lock file. |
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Fix race condition between the statusline and the lock file.
Ludovic Chabant <ludovic@chabant.com>
parents:
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458 if (localtime() - l:timestamp) > 1 && |
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Fix race condition between the statusline and the lock file.
Ludovic Chabant <ludovic@chabant.com>
parents:
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459 \!filereadable(l:abs_tag_file . '.lock') |
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Fix race condition between the statusline and the lock file.
Ludovic Chabant <ludovic@chabant.com>
parents:
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460 call remove(s:maybe_in_progress, l:abs_tag_file) |
| 3 | 461 return '' |
| 462 endif | |
| 463 " It's still there! So probably `ctags` is still running... | |
| 464 " (although there's a chance it crashed, or the script had a problem, and | |
| 465 " the lock file has been left behind... we could try and run some | |
| 466 " additional checks here to see if it's legitimately running, and | |
| 467 " otherwise delete the lock file... maybe in the future...) | |
| 468 return l:gen_msg | |
| 469 endfunction | |
| 470 | |
| 471 " }}} | |
| 472 |