Mercurial > vim
annotate runtime/doc/fold.txt @ 9967:45098d7f72b6 v7.4.2257
commit https://github.com/vim/vim/commit/9f28953f0c1e3d9fffd49af76503f54eaa279acb
Author: Bram Moolenaar <Bram@vim.org>
Date: Fri Aug 26 16:39:03 2016 +0200
patch 7.4.2257
Problem: Coverity complains about not checking for NULL.
Solution: Check for out of memory.
| author | Christian Brabandt <cb@256bit.org> |
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| date | Fri, 26 Aug 2016 16:45:07 +0200 |
| parents | 71e2aca45b81 |
| children | 9f48eab77d62 |
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1 *fold.txt* For Vim version 7.4. Last change: 2016 Jan 02 |
| 7 | 2 |
| 3 | |
| 4 VIM REFERENCE MANUAL by Bram Moolenaar | |
| 5 | |
| 6 | |
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7 Folding *Folding* *folding* *folds* |
| 7 | 8 |
| 9 You can find an introduction on folding in chapter 28 of the user manual. | |
| 10 |usr_28.txt| | |
| 11 | |
| 12 1. Fold methods |fold-methods| | |
| 13 2. Fold commands |fold-commands| | |
| 14 3. Fold options |fold-options| | |
| 15 4. Behavior of folds |fold-behavior| | |
| 16 | |
| 17 {Vi has no Folding} | |
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18 {not available when compiled without the |+folding| feature} |
| 7 | 19 |
| 20 ============================================================================== | |
| 21 1. Fold methods *fold-methods* | |
| 22 | |
| 23 The folding method can be set with the 'foldmethod' option. | |
| 24 | |
| 25 When setting 'foldmethod' to a value other than "manual", all folds are | |
| 26 deleted and new ones created. Switching to the "manual" method doesn't remove | |
| 27 the existing folds. This can be used to first define the folds automatically | |
| 28 and then change them manually. | |
| 29 | |
| 30 There are six methods to select folds: | |
| 31 manual manually define folds | |
| 32 indent more indent means a higher fold level | |
| 33 expr specify an expression to define folds | |
| 34 syntax folds defined by syntax highlighting | |
| 35 diff folds for unchanged text | |
| 36 marker folds defined by markers in the text | |
| 37 | |
| 38 | |
| 39 MANUAL *fold-manual* | |
| 40 | |
| 41 Use commands to manually define the fold regions. This can also be used by a | |
| 42 script that parses text to find folds. | |
| 43 | |
| 44 The level of a fold is only defined by its nesting. To increase the fold | |
| 45 level of a fold for a range of lines, define a fold inside it that has the | |
| 46 same lines. | |
| 47 | |
| 48 The manual folds are lost when you abandon the file. To save the folds use | |
| 49 the |:mkview| command. The view can be restored later with |:loadview|. | |
| 50 | |
| 51 | |
| 52 INDENT *fold-indent* | |
| 53 | |
| 54 The folds are automatically defined by the indent of the lines. | |
| 55 | |
| 56 The foldlevel is computed from the indent of the line, divided by the | |
| 57 'shiftwidth' (rounded down). A sequence of lines with the same or higher fold | |
| 58 level form a fold, with the lines with a higher level forming a nested fold. | |
| 59 | |
| 60 The nesting of folds is limited with 'foldnestmax'. | |
| 61 | |
| 62 Some lines are ignored and get the fold level of the line above or below it, | |
| 2826 | 63 whichever is lower. These are empty or white lines and lines starting |
| 7 | 64 with a character in 'foldignore'. White space is skipped before checking for |
| 65 characters in 'foldignore'. For C use "#" to ignore preprocessor lines. | |
| 66 | |
| 67 When you want to ignore lines in another way, use the 'expr' method. The | |
| 68 |indent()| function can be used in 'foldexpr' to get the indent of a line. | |
| 69 | |
| 70 | |
| 71 EXPR *fold-expr* | |
| 72 | |
| 73 The folds are automatically defined by their foldlevel, like with the "indent" | |
| 74 method. The value of the 'foldexpr' option is evaluated to get the foldlevel | |
| 75 of a line. Examples: | |
| 1255 | 76 This will create a fold for all consecutive lines that start with a tab: > |
| 7 | 77 :set foldexpr=getline(v:lnum)[0]==\"\\t\" |
| 78 This will call a function to compute the fold level: > | |
| 79 :set foldexpr=MyFoldLevel(v:lnum) | |
| 80 This will make a fold out of paragraphs separated by blank lines: > | |
| 81 :set foldexpr=getline(v:lnum)=~'^\\s*$'&&getline(v:lnum+1)=~'\\S'?'<1':1 | |
| 82 this does the same: > | |
| 83 :set foldexpr=getline(v:lnum-1)=~'^\\s*$'&&getline(v:lnum)=~'\\S'?'>1':1 | |
| 84 | |
| 85 Note that backslashes must be used to escape characters that ":set" handles | |
| 86 differently (space, backslash, double quote, etc., see |option-backslash|). | |
| 87 | |
| 88 These are the conditions with which the expression is evaluated: | |
| 89 - The current buffer and window are set for the line. | |
| 90 - The variable "v:lnum" is set to the line number. | |
| 91 - The result is used for the fold level in this way: | |
| 92 value meaning ~ | |
| 93 0 the line is not in a fold | |
| 94 1, 2, .. the line is in a fold with this level | |
| 95 -1 the fold level is undefined, use the fold level of a | |
| 96 line before or after this line, whichever is the | |
| 97 lowest. | |
| 98 "=" use fold level from the previous line | |
| 99 "a1", "a2", .. add one, two, .. to the fold level of the previous | |
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100 line, use the result for the current line |
| 7 | 101 "s1", "s2", .. subtract one, two, .. from the fold level of the |
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102 previous line, use the result for the next line |
| 7 | 103 "<1", "<2", .. a fold with this level ends at this line |
| 104 ">1", ">2", .. a fold with this level starts at this line | |
| 105 | |
| 106 It is not required to mark the start (end) of a fold with ">1" ("<1"), a fold | |
| 107 will also start (end) when the fold level is higher (lower) than the fold | |
| 108 level of the previous line. | |
| 109 | |
| 110 There must be no side effects from the expression. The text in the buffer, | |
| 111 cursor position, the search patterns, options etc. must not be changed. | |
| 818 | 112 You can change and restore them if you are careful. |
| 7 | 113 |
| 114 If there is some error in the expression, or the resulting value isn't | |
| 115 recognized, there is no error message and the fold level will be zero. | |
| 116 For debugging the 'debug' option can be set to "msg", the error messages will | |
| 117 be visible then. | |
| 118 | |
| 119 Note: Since the expression has to be evaluated for every line, this fold | |
| 120 method can be very slow! | |
| 121 | |
| 122 Try to avoid the "=", "a" and "s" return values, since Vim often has to search | |
| 123 backwards for a line for which the fold level is defined. This can be slow. | |
| 124 | |
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125 An example of using "a1" and "s1": For a multi-line C comment, a line |
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126 containing "/*" would return "a1" to start a fold, and a line containing "*/" |
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127 would return "s1" to end the fold after that line: > |
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128 if match(thisline, '/\*') >= 0 |
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129 return 'a1' |
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130 elseif match(thisline, '\*/') >= 0 |
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131 return 's1' |
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132 else |
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133 return '=' |
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134 endif |
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135 However, this won't work for single line comments, strings, etc. |
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136 |
| 7 | 137 |foldlevel()| can be useful to compute a fold level relative to a previous |
| 138 fold level. But note that foldlevel() may return -1 if the level is not known | |
| 139 yet. And it returns the level at the start of the line, while a fold might | |
| 140 end in that line. | |
| 141 | |
| 2152 | 142 It may happened that folds are not updated properly. You can use |zx| or |zX| |
| 143 to force updating folds. | |
| 144 | |
| 7 | 145 |
| 146 SYNTAX *fold-syntax* | |
| 147 | |
| 148 A fold is defined by syntax items that have the "fold" argument. |:syn-fold| | |
| 149 | |
| 150 The fold level is defined by nesting folds. The nesting of folds is limited | |
| 151 with 'foldnestmax'. | |
| 152 | |
| 153 Be careful to specify proper syntax syncing. If this is not done right, folds | |
| 154 may differ from the displayed highlighting. This is especially relevant when | |
| 155 using patterns that match more than one line. In case of doubt, try using | |
| 156 brute-force syncing: > | |
| 157 :syn sync fromstart | |
| 158 | |
| 159 | |
| 160 DIFF *fold-diff* | |
| 161 | |
| 162 The folds are automatically defined for text that is not part of a change or | |
| 163 close to a change. | |
| 164 | |
| 165 This method only works properly when the 'diff' option is set for the current | |
| 166 window and changes are being displayed. Otherwise the whole buffer will be | |
| 167 one big fold. | |
| 168 | |
| 169 The 'diffopt' option can be used to specify the context. That is, the number | |
| 170 of lines between the fold and a change that are not included in the fold. For | |
| 171 example, to use a context of 8 lines: > | |
| 172 :set diffopt=filler,context:8 | |
| 173 The default context is six lines. | |
| 174 | |
| 175 When 'scrollbind' is also set, Vim will attempt to keep the same folds open in | |
| 176 other diff windows, so that the same text is visible. | |
| 177 | |
| 178 | |
| 179 MARKER *fold-marker* | |
| 180 | |
| 181 Markers in the text tell where folds start and end. This allows you to | |
| 182 precisely specify the folds. This will allow deleting and putting a fold, | |
| 183 without the risk of including the wrong lines. The 'foldtext' option is | |
| 184 normally set such that the text before the marker shows up in the folded line. | |
| 185 This makes it possible to give a name to the fold. | |
| 186 | |
| 187 Markers can have a level included, or can use matching pairs. Including a | |
| 188 level is easier, you don't have to add end markers and avoid problems with | |
| 189 non-matching marker pairs. Example: > | |
| 190 /* global variables {{{1 */ | |
| 191 int varA, varB; | |
| 192 | |
| 193 /* functions {{{1 */ | |
| 194 /* funcA() {{{2 */ | |
| 195 void funcA() {} | |
| 196 | |
| 197 /* funcB() {{{2 */ | |
| 198 void funcB() {} | |
| 199 | |
| 200 A fold starts at a "{{{" marker. The following number specifies the fold | |
| 201 level. What happens depends on the difference between the current fold level | |
| 202 and the level given by the marker: | |
| 203 1. If a marker with the same fold level is encountered, the previous fold | |
| 204 ends and another fold with the same level starts. | |
| 205 2. If a marker with a higher fold level is found, a nested fold is started. | |
| 206 3. if a marker with a lower fold level is found, all folds up to and including | |
| 207 this level end and a fold with the specified level starts. | |
| 208 | |
| 33 | 209 The number indicates the fold level. A zero cannot be used (a marker with |
| 210 level zero is ignored). You can use "}}}" with a digit to indicate the level | |
| 211 of the fold that ends. The fold level of the following line will be one less | |
| 212 than the indicated level. Note that Vim doesn't look back to the level of the | |
| 213 matching marker (that would take too much time). Example: > | |
| 7 | 214 |
| 215 {{{1 | |
| 216 fold level here is 1 | |
| 217 {{{3 | |
| 218 fold level here is 3 | |
| 219 }}}3 | |
| 220 fold level here is 2 | |
| 221 | |
| 222 You can also use matching pairs of "{{{" and "}}}" markers to define folds. | |
| 223 Each "{{{" increases the fold level by one, each "}}}" decreases the fold | |
| 224 level by one. Be careful to keep the markers matching! Example: > | |
| 225 | |
| 226 {{{ | |
| 227 fold level here is 1 | |
| 228 {{{ | |
| 229 fold level here is 2 | |
| 230 }}} | |
| 231 fold level here is 1 | |
| 232 | |
| 233 You can mix using markers with a number and without a number. A useful way of | |
| 234 doing this is to use numbered markers for large folds, and unnumbered markers | |
| 235 locally in a function. For example use level one folds for the sections of | |
| 236 your file like "structure definitions", "local variables" and "functions". | |
| 237 Use level 2 markers for each definition and function, Use unnumbered markers | |
| 238 inside functions. When you make changes in a function to split up folds, you | |
| 239 don't have to renumber the markers. | |
| 240 | |
| 241 The markers can be set with the 'foldmarker' option. It is recommended to | |
| 242 keep this at the default value of "{{{,}}}", so that files can be exchanged | |
| 243 between Vim users. Only change it when it is required for the file (e.g., it | |
| 244 contains markers from another folding editor, or the default markers cause | |
| 245 trouble for the language of the file). | |
| 246 | |
| 247 *fold-create-marker* | |
| 248 "zf" can be used to create a fold defined by markers. Vim will insert the | |
| 249 markers for you. Vim will append the start and end marker, as specified with | |
| 250 'foldmarker'. The markers are appended to the end of the line. | |
| 251 'commentstring' is used if it isn't empty. | |
| 252 This does not work properly when: | |
| 253 - The line already contains a marker with a level number. Vim then doesn't | |
| 254 know what to do. | |
| 255 - Folds nearby use a level number in their marker which gets in the way. | |
| 256 - The line is inside a comment, 'commentstring' isn't empty and nested | |
| 257 comments don't work. For example with C: adding /* {{{ */ inside a comment | |
| 258 will truncate the existing comment. Either put the marker before or after | |
| 259 the comment, or add the marker manually. | |
| 260 Generally it's not a good idea to let Vim create markers when you already have | |
| 261 markers with a level number. | |
| 262 | |
| 263 *fold-delete-marker* | |
| 264 "zd" can be used to delete a fold defined by markers. Vim will delete the | |
| 265 markers for you. Vim will search for the start and end markers, as specified | |
| 266 with 'foldmarker', at the start and end of the fold. When the text around the | |
| 267 marker matches with 'commentstring', that text is deleted as well. | |
| 268 This does not work properly when: | |
| 269 - A line contains more than one marker and one of them specifies a level. | |
| 270 Only the first one is removed, without checking if this will have the | |
| 271 desired effect of deleting the fold. | |
| 272 - The marker contains a level number and is used to start or end several folds | |
| 273 at the same time. | |
| 274 | |
| 275 ============================================================================== | |
| 276 2. Fold commands *fold-commands* *E490* | |
| 277 | |
| 278 All folding commands start with "z". Hint: the "z" looks like a folded piece | |
| 279 of paper, if you look at it from the side. | |
| 280 | |
| 281 | |
| 282 CREATING AND DELETING FOLDS ~ | |
| 283 *zf* *E350* | |
| 284 zf{motion} or | |
| 285 {Visual}zf Operator to create a fold. | |
| 286 This only works when 'foldmethod' is "manual" or "marker". | |
| 287 The new fold will be closed for the "manual" method. | |
| 288 'foldenable' will be set. | |
| 289 Also see |fold-create-marker|. | |
| 290 | |
| 291 *zF* | |
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292 zF Create a fold for [count] lines. Works like "zf". |
| 7 | 293 |
| 294 :{range}fo[ld] *:fold* *:fo* | |
| 295 Create a fold for the lines in {range}. Works like "zf". | |
| 296 | |
| 297 *zd* *E351* | |
| 42 | 298 zd Delete one fold at the cursor. When the cursor is on a folded |
| 7 | 299 line, that fold is deleted. Nested folds are moved one level |
| 5555 | 300 up. In Visual mode one level of all folds (partially) in the |
| 301 selected area are deleted. | |
| 302 Careful: This easily deletes more folds than you expect and | |
| 303 there is no undo for manual folding. | |
| 7 | 304 This only works when 'foldmethod' is "manual" or "marker". |
| 305 Also see |fold-delete-marker|. | |
| 306 | |
| 307 *zD* | |
| 308 zD Delete folds recursively at the cursor. In Visual mode all | |
| 309 folds (partially) in the selected area and all nested folds in | |
| 310 them are deleted. | |
| 311 This only works when 'foldmethod' is "manual" or "marker". | |
| 312 Also see |fold-delete-marker|. | |
| 313 | |
| 314 *zE* *E352* | |
| 315 zE Eliminate all folds in the window. | |
| 316 This only works when 'foldmethod' is "manual" or "marker". | |
| 317 Also see |fold-delete-marker|. | |
| 318 | |
| 319 | |
| 320 OPENING AND CLOSING FOLDS ~ | |
| 321 | |
| 322 A fold smaller than 'foldminlines' will always be displayed like it was open. | |
| 323 Therefore the commands below may work differently on small folds. | |
| 324 | |
| 325 *zo* | |
| 326 zo Open one fold under the cursor. When a count is given, that | |
| 327 many folds deep will be opened. In Visual mode one level of | |
| 328 folds is opened for all lines in the selected area. | |
| 329 | |
| 330 *zO* | |
| 331 zO Open all folds under the cursor recursively. Folds that don't | |
| 332 contain the cursor line are unchanged. | |
| 333 In Visual mode it opens all folds that are in the selected | |
| 334 area, also those that are only partly selected. | |
| 335 | |
| 336 *zc* | |
| 337 zc Close one fold under the cursor. When a count is given, that | |
| 338 many folds deep are closed. In Visual mode one level of folds | |
| 339 is closed for all lines in the selected area. | |
| 340 'foldenable' will be set. | |
| 341 | |
| 342 *zC* | |
| 343 zC Close all folds under the cursor recursively. Folds that | |
| 344 don't contain the cursor line are unchanged. | |
| 345 In Visual mode it closes all folds that are in the selected | |
| 346 area, also those that are only partly selected. | |
| 347 'foldenable' will be set. | |
| 348 | |
| 349 *za* | |
| 236 | 350 za When on a closed fold: open it. When folds are nested, you |
| 7 | 351 may have to use "za" several times. When a count is given, |
| 352 that many closed folds are opened. | |
| 353 When on an open fold: close it and set 'foldenable'. This | |
| 354 will only close one level, since using "za" again will open | |
| 355 the fold. When a count is given that many folds will be | |
| 356 closed (that's not the same as repeating "za" that many | |
| 357 times). | |
| 358 | |
| 359 *zA* | |
| 360 zA When on a closed fold: open it recursively. | |
| 361 When on an open fold: close it recursively and set | |
| 362 'foldenable'. | |
| 363 | |
| 364 *zv* | |
| 365 zv View cursor line: Open just enough folds to make the line in | |
| 366 which the cursor is located not folded. | |
| 367 | |
| 368 *zx* | |
| 369 zx Update folds: Undo manually opened and closed folds: re-apply | |
| 370 'foldlevel', then do "zv": View cursor line. | |
| 2152 | 371 Also forces recomputing folds. This is useful when using |
| 372 'foldexpr' and the buffer is changed in a way that results in | |
| 373 folds not to be updated properly. | |
| 7 | 374 |
| 375 *zX* | |
| 376 zX Undo manually opened and closed folds: re-apply 'foldlevel'. | |
| 2152 | 377 Also forces recomputing folds, like |zx|. |
| 7 | 378 |
| 379 *zm* | |
| 6725 | 380 zm Fold more: Subtract |v:count1| from 'foldlevel'. If 'foldlevel' was |
| 7 | 381 already zero nothing happens. |
| 382 'foldenable' will be set. | |
| 383 | |
| 384 *zM* | |
| 385 zM Close all folds: set 'foldlevel' to 0. | |
| 386 'foldenable' will be set. | |
| 387 | |
| 388 *zr* | |
| 6725 | 389 zr Reduce folding: Add |v:count1| to 'foldlevel'. |
| 7 | 390 |
| 391 *zR* | |
| 392 zR Open all folds. This sets 'foldlevel' to highest fold level. | |
| 393 | |
| 394 *:foldo* *:foldopen* | |
| 395 :{range}foldo[pen][!] | |
| 396 Open folds in {range}. When [!] is added all folds are | |
| 397 opened. Useful to see all the text in {range}. Without [!] | |
| 398 one level of folds is opened. | |
| 399 | |
| 400 *:foldc* *:foldclose* | |
| 401 :{range}foldc[lose][!] | |
| 402 Close folds in {range}. When [!] is added all folds are | |
| 403 closed. Useful to hide all the text in {range}. Without [!] | |
| 404 one level of folds is closed. | |
| 405 | |
| 406 *zn* | |
| 407 zn Fold none: reset 'foldenable'. All folds will be open. | |
| 408 | |
| 409 *zN* | |
| 410 zN Fold normal: set 'foldenable'. All folds will be as they | |
| 411 were before. | |
| 412 | |
| 413 *zi* | |
| 414 zi Invert 'foldenable'. | |
| 415 | |
| 416 | |
| 417 MOVING OVER FOLDS ~ | |
| 418 *[z* | |
| 419 [z Move to the start of the current open fold. If already at the | |
| 420 start, move to the start of the fold that contains it. If | |
| 421 there is no containing fold, the command fails. | |
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422 When a count is used, repeats the command [count] times. |
| 7 | 423 |
| 424 *]z* | |
| 425 ]z Move to the end of the current open fold. If already at the | |
| 426 end, move to the end of the fold that contains it. If there | |
| 427 is no containing fold, the command fails. | |
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428 When a count is used, repeats the command [count] times. |
| 7 | 429 |
| 430 *zj* | |
| 431 zj Move downwards to the start of the next fold. A closed fold | |
| 432 is counted as one fold. | |
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433 When a count is used, repeats the command [count] times. |
| 7 | 434 This command can be used after an |operator|. |
| 435 | |
| 436 *zk* | |
| 437 zk Move upwards to the end of the previous fold. A closed fold | |
| 438 is counted as one fold. | |
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439 When a count is used, repeats the command [count] times. |
| 7 | 440 This command can be used after an |operator|. |
| 441 | |
| 442 | |
| 443 EXECUTING COMMANDS ON FOLDS ~ | |
| 444 | |
| 445 :[range]foldd[oopen] {cmd} *:foldd* *:folddoopen* | |
| 446 Execute {cmd} on all lines that are not in a closed fold. | |
| 447 When [range] is given, only these lines are used. | |
| 448 Each time {cmd} is executed the cursor is positioned on the | |
| 449 line it is executed for. | |
| 450 This works like the ":global" command: First all lines that | |
| 451 are not in a closed fold are marked. Then the {cmd} is | |
| 452 executed for all marked lines. Thus when {cmd} changes the | |
| 453 folds, this has no influence on where it is executed (except | |
| 454 when lines are deleted, of course). | |
| 455 Example: > | |
| 456 :folddoopen s/end/loop_end/ge | |
| 457 < Note the use of the "e" flag to avoid getting an error message | |
| 458 where "end" doesn't match. | |
| 459 | |
| 460 :[range]folddoc[losed] {cmd} *:folddoc* *:folddoclosed* | |
| 461 Execute {cmd} on all lines that are in a closed fold. | |
| 462 Otherwise like ":folddoopen". | |
| 463 | |
| 464 ============================================================================== | |
| 465 3. Fold options *fold-options* | |
| 466 | |
| 467 COLORS *fold-colors* | |
| 468 | |
| 469 The colors of a closed fold are set with the Folded group |hl-Folded|. The | |
| 470 colors of the fold column are set with the FoldColumn group |hl-FoldColumn|. | |
| 471 Example to set the colors: > | |
| 472 | |
| 473 :highlight Folded guibg=grey guifg=blue | |
| 474 :highlight FoldColumn guibg=darkgrey guifg=white | |
| 475 | |
| 476 | |
| 477 FOLDLEVEL *fold-foldlevel* | |
| 478 | |
| 479 'foldlevel' is a number option: The higher the more folded regions are open. | |
| 480 When 'foldlevel' is 0, all folds are closed. | |
| 42 | 481 When 'foldlevel' is positive, some folds are closed. |
| 7 | 482 When 'foldlevel' is very high, all folds are open. |
| 483 'foldlevel' is applied when it is changed. After that manually folds can be | |
| 484 opened and closed. | |
| 485 When increased, folds above the new level are opened. No manually opened | |
| 486 folds will be closed. | |
| 487 When decreased, folds above the new level are closed. No manually closed | |
| 488 folds will be opened. | |
| 489 | |
| 490 | |
| 491 FOLDTEXT *fold-foldtext* | |
| 492 | |
| 493 'foldtext' is a string option that specifies an expression. This expression | |
| 494 is evaluated to obtain the text displayed for a closed fold. Example: > | |
| 495 | |
| 496 :set foldtext=v:folddashes.substitute(getline(v:foldstart),'/\\*\\\|\\*/\\\|{{{\\d\\=','','g') | |
| 497 | |
| 498 This shows the first line of the fold, with "/*", "*/" and "{{{" removed. | |
| 499 Note the use of backslashes to avoid some characters to be interpreted by the | |
| 500 ":set" command. It's simpler to define a function and call that: > | |
| 501 | |
| 502 :set foldtext=MyFoldText() | |
| 503 :function MyFoldText() | |
| 504 : let line = getline(v:foldstart) | |
| 505 : let sub = substitute(line, '/\*\|\*/\|{{{\d\=', '', 'g') | |
| 506 : return v:folddashes . sub | |
| 507 :endfunction | |
| 508 | |
| 509 Evaluating 'foldtext' is done in the |sandbox|. The current window is set to | |
| 510 the window that displays the line. Errors are ignored. | |
| 511 | |
| 512 The default value is |foldtext()|. This returns a reasonable text for most | |
| 513 types of folding. If you don't like it, you can specify your own 'foldtext' | |
| 514 expression. It can use these special Vim variables: | |
| 515 v:foldstart line number of first line in the fold | |
| 516 v:foldend line number of last line in the fold | |
| 517 v:folddashes a string that contains dashes to represent the | |
| 518 foldlevel. | |
| 519 v:foldlevel the foldlevel of the fold | |
| 520 | |
| 521 In the result a TAB is replaced with a space and unprintable characters are | |
| 522 made into printable characters. | |
| 523 | |
| 524 The resulting line is truncated to fit in the window, it never wraps. | |
| 525 When there is room after the text, it is filled with the character specified | |
| 526 by 'fillchars'. | |
| 527 | |
| 528 Note that backslashes need to be used for characters that the ":set" command | |
| 529 handles differently: Space, backslash and double-quote. |option-backslash| | |
| 530 | |
| 531 | |
| 532 FOLDCOLUMN *fold-foldcolumn* | |
| 533 | |
| 534 'foldcolumn' is a number, which sets the width for a column on the side of the | |
| 535 window to indicate folds. When it is zero, there is no foldcolumn. A normal | |
| 519 | 536 value is 4 or 5. The minimal useful value is 2, although 1 still provides |
| 537 some information. The maximum is 12. | |
| 7 | 538 |
| 539 An open fold is indicated with a column that has a '-' at the top and '|' | |
| 540 characters below it. This column stops where the open fold stops. When folds | |
| 541 nest, the nested fold is one character right of the fold it's contained in. | |
| 542 | |
| 543 A closed fold is indicated with a '+'. | |
| 544 | |
| 545 Where the fold column is too narrow to display all nested folds, digits are | |
| 546 shown to indicate the nesting level. | |
| 547 | |
| 548 The mouse can also be used to open and close folds by clicking in the | |
| 549 fold column: | |
| 550 - Click on a '+' to open the closed fold at this row. | |
| 551 - Click on any other non-blank character to close the open fold at this row. | |
| 552 | |
| 553 | |
| 554 OTHER OPTIONS | |
| 555 | |
| 556 'foldenable' 'fen': Open all folds while not set. | |
| 557 'foldexpr' 'fde': Expression used for "expr" folding. | |
| 558 'foldignore' 'fdi': Characters used for "indent" folding. | |
| 559 'foldmarker' 'fmr': Defined markers used for "marker" folding. | |
| 560 'foldmethod' 'fdm': Name of the current folding method. | |
| 561 'foldminlines' 'fml': Minimum number of screen lines for a fold to be | |
| 562 displayed closed. | |
| 563 'foldnestmax' 'fdn': Maximum nesting for "indent" and "syntax" folding. | |
| 564 'foldopen' 'fdo': Which kinds of commands open closed folds. | |
| 565 'foldclose' 'fcl': When the folds not under the cursor are closed. | |
| 566 | |
| 567 ============================================================================== | |
| 568 4. Behavior of folds *fold-behavior* | |
| 569 | |
| 570 When moving the cursor upwards or downwards and when scrolling, the cursor | |
| 571 will move to the first line of a sequence of folded lines. When the cursor is | |
| 572 already on a folded line, it moves to the next unfolded line or the next | |
| 573 closed fold. | |
| 574 | |
| 575 While the cursor is on folded lines, the cursor is always displayed in the | |
| 576 first column. The ruler does show the actual cursor position, but since the | |
| 577 line is folded, it cannot be displayed there. | |
| 578 | |
| 579 Many movement commands handle a sequence of folded lines like an empty line. | |
| 580 For example, the "w" command stops once in the first column. | |
| 581 | |
| 582 When in Insert mode, the cursor line is never folded. That allows you to see | |
| 583 what you type! | |
| 584 | |
| 585 When using an operator, a closed fold is included as a whole. Thus "dl" | |
| 586 deletes the whole closed fold under the cursor. | |
| 587 | |
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588 For Ex commands that work on buffer lines the range is adjusted to always |
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589 start at the first line of a closed fold and end at the last line of a closed |
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590 fold. Thus this command: > |
| 7 | 591 :s/foo/bar/g |
| 592 when used with the cursor on a closed fold, will replace "foo" with "bar" in | |
| 593 all lines of the fold. | |
| 594 This does not happen for |:folddoopen| and |:folddoclosed|. | |
| 595 | |
| 596 When editing a buffer that has been edited before, the last used folding | |
| 597 settings are used again. For manual folding the defined folds are restored. | |
| 598 For all folding methods the manually opened and closed folds are restored. | |
| 599 If this buffer has been edited in this window, the values from back then are | |
| 600 used. Otherwise the values from the window where the buffer was edited last | |
| 601 are used. | |
| 602 | |
| 603 ============================================================================== | |
| 604 vim:tw=78:ts=8:ft=help:norl: |