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6bf7aab6 | 1 | @c This is part of the Emacs manual. |
ba318903 | 2 | @c Copyright (C) 1985-1987, 1993-1995, 1997, 2001-2014 Free Software |
ab422c4d | 3 | @c Foundation, Inc. |
6bf7aab6 | 4 | @c See file emacs.texi for copying conditions. |
622a113e | 5 | @node Abbrevs |
6bf7aab6 DL |
6 | @chapter Abbrevs |
7 | @cindex abbrevs | |
8 | @cindex expansion (of abbrevs) | |
9 | ||
10 | A defined @dfn{abbrev} is a word which @dfn{expands}, if you insert | |
11 | it, into some different text. Abbrevs are defined by the user to expand | |
12 | in specific ways. For example, you might define @samp{foo} as an abbrev | |
3f7ba267 | 13 | expanding to @samp{find outer otter}. Then you could insert |
6bf7aab6 DL |
14 | @samp{find outer otter } into the buffer by typing @kbd{f o o |
15 | @key{SPC}}. | |
16 | ||
17 | A second kind of abbreviation facility is called @dfn{dynamic abbrev | |
18 | expansion}. You use dynamic abbrev expansion with an explicit command | |
19 | to expand the letters in the buffer before point by looking for other | |
20 | words in the buffer that start with those letters. @xref{Dynamic | |
21 | Abbrevs}. | |
22 | ||
3f7ba267 RS |
23 | ``Hippie'' expansion generalizes abbreviation expansion. |
24 | @xref{Hippie Expand, , Hippie Expansion, autotype, Features for | |
25 | Automatic Typing}. | |
9d9f0f85 | 26 | |
6bf7aab6 DL |
27 | @menu |
28 | * Abbrev Concepts:: Fundamentals of defined abbrevs. | |
29 | * Defining Abbrevs:: Defining an abbrev, so it will expand when typed. | |
30 | * Expanding Abbrevs:: Controlling expansion: prefixes, canceling expansion. | |
31 | * Editing Abbrevs:: Viewing or editing the entire list of defined abbrevs. | |
32 | * Saving Abbrevs:: Saving the entire list of abbrevs for another session. | |
33 | * Dynamic Abbrevs:: Abbreviations for words already in the buffer. | |
34 | * Dabbrev Customization:: What is a word, for dynamic abbrevs. Case handling. | |
35 | @end menu | |
36 | ||
37 | @node Abbrev Concepts | |
38 | @section Abbrev Concepts | |
39 | ||
eceeb5fc | 40 | An @dfn{abbrev} is a word that has been defined to @dfn{expand} into |
6bf7aab6 DL |
41 | a specified @dfn{expansion}. When you insert a word-separator character |
42 | following the abbrev, that expands the abbrev---replacing the abbrev | |
43 | with its expansion. For example, if @samp{foo} is defined as an abbrev | |
eceeb5fc CY |
44 | expanding to @samp{find outer otter}, then typing @kbd{f o o .} will |
45 | insert @samp{find outer otter.}. | |
6bf7aab6 DL |
46 | |
47 | @findex abbrev-mode | |
6bf7aab6 DL |
48 | @cindex Abbrev mode |
49 | @cindex mode, Abbrev | |
c40a7de7 CY |
50 | Abbrevs expand only when Abbrev mode, a buffer-local minor mode, is |
51 | enabled. Disabling Abbrev mode does not cause abbrev definitions to | |
52 | be forgotten, but they do not expand until Abbrev mode is enabled | |
53 | again. The command @kbd{M-x abbrev-mode} toggles Abbrev mode; with a | |
54 | numeric argument, it turns Abbrev mode on if the argument is positive, | |
55 | off otherwise. @xref{Minor Modes}. | |
6bf7aab6 | 56 | |
3f7ba267 | 57 | Abbrevs can have @dfn{mode-specific} definitions, active only in one major |
6bf7aab6 DL |
58 | mode. Abbrevs can also have @dfn{global} definitions that are active in |
59 | all major modes. The same abbrev can have a global definition and various | |
60 | mode-specific definitions for different major modes. A mode-specific | |
61 | definition for the current major mode overrides a global definition. | |
62 | ||
ea16568d | 63 | You can define abbrevs interactively during the editing session, |
eceeb5fc CY |
64 | irrespective of whether Abbrev mode is enabled. You can also save |
65 | lists of abbrev definitions in files, which you can the reload for use | |
66 | in later sessions. | |
6bf7aab6 DL |
67 | |
68 | @node Defining Abbrevs | |
69 | @section Defining Abbrevs | |
70 | ||
71 | @table @kbd | |
72 | @item C-x a g | |
73 | Define an abbrev, using one or more words before point as its expansion | |
74 | (@code{add-global-abbrev}). | |
75 | @item C-x a l | |
76 | Similar, but define an abbrev specific to the current major mode | |
77 | (@code{add-mode-abbrev}). | |
78 | @item C-x a i g | |
79 | Define a word in the buffer as an abbrev (@code{inverse-add-global-abbrev}). | |
80 | @item C-x a i l | |
81 | Define a word in the buffer as a mode-specific abbrev | |
82 | (@code{inverse-add-mode-abbrev}). | |
387ac9c1 RS |
83 | @item M-x define-global-abbrev @key{RET} @var{abbrev} @key{RET} @var{exp} @key{RET} |
84 | Define @var{abbrev} as an abbrev expanding into @var{exp}. | |
85 | @item M-x define-mode-abbrev @key{RET} @var{abbrev} @key{RET} @var{exp} @key{RET} | |
86 | Define @var{abbrev} as a mode-specific abbrev expanding into @var{exp}. | |
6bf7aab6 | 87 | @item M-x kill-all-abbrevs |
3f7ba267 | 88 | Discard all abbrev definitions, leaving a blank slate. |
6bf7aab6 DL |
89 | @end table |
90 | ||
91 | @kindex C-x a g | |
92 | @findex add-global-abbrev | |
93 | The usual way to define an abbrev is to enter the text you want the | |
94 | abbrev to expand to, position point after it, and type @kbd{C-x a g} | |
95 | (@code{add-global-abbrev}). This reads the abbrev itself using the | |
96 | minibuffer, and then defines it as an abbrev for one or more words before | |
97 | point. Use a numeric argument to say how many words before point should be | |
98 | taken as the expansion. For example, to define the abbrev @samp{foo} as | |
99 | mentioned above, insert the text @samp{find outer otter} and then type | |
100 | @kbd{C-u 3 C-x a g f o o @key{RET}}. | |
101 | ||
102 | An argument of zero to @kbd{C-x a g} means to use the contents of the | |
103 | region as the expansion of the abbrev being defined. | |
104 | ||
105 | @kindex C-x a l | |
106 | @findex add-mode-abbrev | |
107 | The command @kbd{C-x a l} (@code{add-mode-abbrev}) is similar, but | |
c40a7de7 CY |
108 | defines a mode-specific abbrev for the current major mode. The |
109 | arguments work the same as for @kbd{C-x a g}. | |
6bf7aab6 DL |
110 | |
111 | @kindex C-x a i g | |
112 | @findex inverse-add-global-abbrev | |
113 | @kindex C-x a i l | |
114 | @findex inverse-add-mode-abbrev | |
c40a7de7 CY |
115 | @kbd{C-x a i g} (@code{inverse-add-global-abbrev}) and @kbd{C-x a i |
116 | l} (@code{inverse-add-mode-abbrev}) perform the opposite task: if the | |
117 | abbrev text is already in the buffer, you use these commands to define | |
118 | an abbrev by specifying the expansion in the minibuffer. These | |
119 | commands will expand the abbrev text used for the definition. | |
6bf7aab6 | 120 | |
387ac9c1 RS |
121 | @findex define-mode-abbrev |
122 | @findex define-global-abbrev | |
123 | You can define an abbrev without inserting either the abbrev or its | |
124 | expansion in the buffer using the command @code{define-global-abbrev}. | |
110c9495 | 125 | It reads two arguments---the abbrev, and its expansion. The command |
387ac9c1 RS |
126 | @code{define-mode-abbrev} does likewise for a mode-specific abbrev. |
127 | ||
c40a7de7 CY |
128 | To change the definition of an abbrev, just make a new definition. |
129 | When an abbrev has a prior definition, the abbrev definition commands | |
58fa012d | 130 | ask for confirmation before replacing it. |
6bf7aab6 | 131 | |
6bf7aab6 | 132 | @findex kill-all-abbrevs |
3f7ba267 RS |
133 | To remove an abbrev definition, give a negative argument to the |
134 | abbrev definition command: @kbd{C-u - C-x a g} or @kbd{C-u - C-x a l}. | |
135 | The former removes a global definition, while the latter removes a | |
136 | mode-specific definition. @kbd{M-x kill-all-abbrevs} removes all | |
137 | abbrev definitions, both global and local. | |
6bf7aab6 DL |
138 | |
139 | @node Expanding Abbrevs | |
140 | @section Controlling Abbrev Expansion | |
141 | ||
ccb467ec RS |
142 | When Abbrev mode is enabled, an abbrev expands whenever it is |
143 | present in the buffer just before point and you type a self-inserting | |
1df7defd | 144 | whitespace or punctuation character (@key{SPC}, comma, etc.). More |
ccb467ec RS |
145 | precisely, any character that is not a word constituent expands an |
146 | abbrev, and any word-constituent character can be part of an abbrev. | |
147 | The most common way to use an abbrev is to insert it and then insert a | |
148 | punctuation or whitespace character to expand it. | |
6bf7aab6 DL |
149 | |
150 | @vindex abbrev-all-caps | |
c40a7de7 CY |
151 | Abbrev expansion preserves case: @samp{foo} expands to @samp{find |
152 | outer otter}, and @samp{Foo} to @samp{Find outer otter}. @samp{FOO} | |
153 | expands to @samp{Find Outer Otter} by default, but if you change the | |
154 | variable @code{abbrev-all-caps} to a non-@code{nil} value, it expands | |
155 | to @samp{FIND OUTER OTTER}. | |
6bf7aab6 DL |
156 | |
157 | These commands are used to control abbrev expansion: | |
158 | ||
159 | @table @kbd | |
160 | @item M-' | |
161 | Separate a prefix from a following abbrev to be expanded | |
162 | (@code{abbrev-prefix-mark}). | |
163 | @item C-x a e | |
164 | @findex expand-abbrev | |
165 | Expand the abbrev before point (@code{expand-abbrev}). | |
166 | This is effective even when Abbrev mode is not enabled. | |
167 | @item M-x expand-region-abbrevs | |
168 | Expand some or all abbrevs found in the region. | |
169 | @end table | |
170 | ||
171 | @kindex M-' | |
172 | @findex abbrev-prefix-mark | |
3f7ba267 RS |
173 | You may wish to expand an abbrev and attach a prefix to the expansion; |
174 | for example, if @samp{cnst} expands into @samp{construction}, you might want | |
175 | to use it to enter @samp{reconstruction}. It does not work to type | |
6bf7aab6 DL |
176 | @kbd{recnst}, because that is not necessarily a defined abbrev. What |
177 | you can do is use the command @kbd{M-'} (@code{abbrev-prefix-mark}) in | |
178 | between the prefix @samp{re} and the abbrev @samp{cnst}. First, insert | |
179 | @samp{re}. Then type @kbd{M-'}; this inserts a hyphen in the buffer to | |
180 | indicate that it has done its work. Then insert the abbrev @samp{cnst}; | |
181 | the buffer now contains @samp{re-cnst}. Now insert a non-word character | |
182 | to expand the abbrev @samp{cnst} into @samp{construction}. This | |
183 | expansion step also deletes the hyphen that indicated @kbd{M-'} had been | |
184 | used. The result is the desired @samp{reconstruction}. | |
185 | ||
186 | If you actually want the text of the abbrev in the buffer, rather than | |
187 | its expansion, you can accomplish this by inserting the following | |
188 | punctuation with @kbd{C-q}. Thus, @kbd{foo C-q ,} leaves @samp{foo,} in | |
3f7ba267 | 189 | the buffer, not expanding it. |
6bf7aab6 DL |
190 | |
191 | @findex unexpand-abbrev | |
c40a7de7 CY |
192 | If you expand an abbrev by mistake, you can undo the expansion by |
193 | typing @kbd{C-/} (@code{undo}). @xref{Undo}. This undoes the | |
194 | insertion of the abbrev expansion and brings back the abbrev text. If | |
195 | the result you want is the terminating non-word character plus the | |
196 | unexpanded abbrev, you must reinsert the terminating character, | |
197 | quoting it with @kbd{C-q}. You can also use the command @kbd{M-x | |
198 | unexpand-abbrev} to cancel the last expansion without deleting the | |
199 | terminating character. | |
6bf7aab6 DL |
200 | |
201 | @findex expand-region-abbrevs | |
202 | @kbd{M-x expand-region-abbrevs} searches through the region for defined | |
203 | abbrevs, and for each one found offers to replace it with its expansion. | |
204 | This command is useful if you have typed in text using abbrevs but forgot | |
205 | to turn on Abbrev mode first. It may also be useful together with a | |
206 | special set of abbrev definitions for making several global replacements at | |
207 | once. This command is effective even if Abbrev mode is not enabled. | |
208 | ||
718279c0 CY |
209 | Expanding any abbrev runs @code{abbrev-expand-functions}, a special |
210 | hook. Functions in this special hook can make arbitrary changes to | |
211 | the abbrev expansion. @xref{Abbrev Expansion,,, elisp, The Emacs Lisp | |
212 | Reference Manual}. | |
6bf7aab6 | 213 | |
6bf7aab6 DL |
214 | @node Editing Abbrevs |
215 | @section Examining and Editing Abbrevs | |
216 | ||
217 | @table @kbd | |
218 | @item M-x list-abbrevs | |
58fa012d | 219 | Display a list of all abbrev definitions. With a numeric argument, list |
bc3d8689 | 220 | only local abbrevs. |
6bf7aab6 DL |
221 | @item M-x edit-abbrevs |
222 | Edit a list of abbrevs; you can add, alter or remove definitions. | |
223 | @end table | |
224 | ||
225 | @findex list-abbrevs | |
226 | The output from @kbd{M-x list-abbrevs} looks like this: | |
227 | ||
228 | @example | |
3f7ba267 | 229 | @var{various other tables@dots{}} |
6bf7aab6 | 230 | (lisp-mode-abbrev-table) |
8838673e | 231 | "dk" 0 "define-key" |
6bf7aab6 | 232 | (global-abbrev-table) |
8838673e | 233 | "dfn" 0 "definition" |
6bf7aab6 DL |
234 | @end example |
235 | ||
236 | @noindent | |
237 | (Some blank lines of no semantic significance, and some other abbrev | |
238 | tables, have been omitted.) | |
239 | ||
240 | A line containing a name in parentheses is the header for abbrevs in a | |
241 | particular abbrev table; @code{global-abbrev-table} contains all the global | |
242 | abbrevs, and the other abbrev tables that are named after major modes | |
243 | contain the mode-specific abbrevs. | |
244 | ||
245 | Within each abbrev table, each nonblank line defines one abbrev. The | |
246 | word at the beginning of the line is the abbrev. The number that | |
247 | follows is the number of times the abbrev has been expanded. Emacs | |
248 | keeps track of this to help you see which abbrevs you actually use, so | |
249 | that you can eliminate those that you don't use often. The string at | |
250 | the end of the line is the expansion. | |
251 | ||
dc12b2be | 252 | Some abbrevs are marked with @samp{(sys)}. These ``system'' abbrevs |
c4ad63f6 GM |
253 | (@pxref{Abbrevs,,, elisp, The Emacs Lisp Reference Manual}) are |
254 | pre-defined by various modes, and are not saved to your abbrev file. | |
fcca8c59 GM |
255 | To disable a ``system'' abbrev, define an abbrev of the same name that |
256 | expands to itself, and save it to your abbrev file. | |
c4ad63f6 | 257 | |
6bf7aab6 DL |
258 | @findex edit-abbrevs |
259 | @kindex C-c C-c @r{(Edit Abbrevs)} | |
260 | @kbd{M-x edit-abbrevs} allows you to add, change or kill abbrev | |
261 | definitions by editing a list of them in an Emacs buffer. The list has | |
262 | the same format described above. The buffer of abbrevs is called | |
1c64e6ed | 263 | @file{*Abbrevs*}, and is in Edit-Abbrevs mode. Type @kbd{C-c C-c} in |
6bf7aab6 DL |
264 | this buffer to install the abbrev definitions as specified in the |
265 | buffer---and delete any abbrev definitions not listed. | |
266 | ||
267 | The command @code{edit-abbrevs} is actually the same as | |
1c64e6ed | 268 | @code{list-abbrevs} except that it selects the buffer @file{*Abbrevs*} |
6bf7aab6 DL |
269 | whereas @code{list-abbrevs} merely displays it in another window. |
270 | ||
271 | @node Saving Abbrevs | |
272 | @section Saving Abbrevs | |
273 | ||
274 | These commands allow you to keep abbrev definitions between editing | |
275 | sessions. | |
276 | ||
277 | @table @kbd | |
278 | @item M-x write-abbrev-file @key{RET} @var{file} @key{RET} | |
279 | Write a file @var{file} describing all defined abbrevs. | |
280 | @item M-x read-abbrev-file @key{RET} @var{file} @key{RET} | |
281 | Read the file @var{file} and define abbrevs as specified therein. | |
6bf7aab6 DL |
282 | @item M-x define-abbrevs |
283 | Define abbrevs from definitions in current buffer. | |
284 | @item M-x insert-abbrevs | |
285 | Insert all abbrevs and their expansions into current buffer. | |
286 | @end table | |
287 | ||
288 | @findex write-abbrev-file | |
289 | @kbd{M-x write-abbrev-file} reads a file name using the minibuffer and | |
290 | then writes a description of all current abbrev definitions into that | |
291 | file. This is used to save abbrev definitions for use in a later | |
292 | session. The text stored in the file is a series of Lisp expressions | |
293 | that, when executed, define the same abbrevs that you currently have. | |
294 | ||
295 | @findex read-abbrev-file | |
296 | @findex quietly-read-abbrev-file | |
297 | @vindex abbrev-file-name | |
444faccc | 298 | @cindex abbrev file |
b59c5368 RS |
299 | @kbd{M-x read-abbrev-file} reads a file name using the minibuffer |
300 | and then reads the file, defining abbrevs according to the contents of | |
301 | the file. The function @code{quietly-read-abbrev-file} is similar | |
302 | except that it does not display a message in the echo area; you cannot | |
91ed7ea8 CY |
303 | invoke it interactively, and it is used primarily in your init file |
304 | (@pxref{Init File}). If either of these functions is called with | |
305 | @code{nil} as the argument, it uses the file given by the variable | |
306 | @code{abbrev-file-name}, which is @file{~/.emacs.d/abbrev_defs} by | |
307 | default. This is your standard abbrev definition file, and Emacs | |
308 | loads abbrevs from it automatically when it starts up. (As an | |
309 | exception, Emacs does not load the abbrev file when it is started in | |
310 | batch mode. @xref{Initial Options}, for a description of batch mode.) | |
6bf7aab6 DL |
311 | |
312 | @vindex save-abbrevs | |
b59c5368 RS |
313 | Emacs will offer to save abbrevs automatically if you have changed |
314 | any of them, whenever it offers to save all files (for @kbd{C-x s} or | |
315 | @kbd{C-x C-c}). It saves them in the file specified by | |
316 | @code{abbrev-file-name}. This feature can be inhibited by setting the | |
317 | variable @code{save-abbrevs} to @code{nil}. | |
6bf7aab6 DL |
318 | |
319 | @findex insert-abbrevs | |
320 | @findex define-abbrevs | |
321 | The commands @kbd{M-x insert-abbrevs} and @kbd{M-x define-abbrevs} are | |
322 | similar to the previous commands but work on text in an Emacs buffer. | |
6a080ff1 | 323 | @kbd{M-x insert-abbrevs} inserts text into the current buffer after point, |
6bf7aab6 | 324 | describing all current abbrev definitions; @kbd{M-x define-abbrevs} parses |
3f7ba267 | 325 | the entire current buffer and defines abbrevs accordingly. |
6bf7aab6 DL |
326 | |
327 | @node Dynamic Abbrevs | |
328 | @section Dynamic Abbrev Expansion | |
329 | ||
3f7ba267 RS |
330 | The abbrev facility described above operates automatically as you |
331 | insert text, but all abbrevs must be defined explicitly. By contrast, | |
332 | @dfn{dynamic abbrevs} allow the meanings of abbreviations to be | |
333 | determined automatically from the contents of the buffer, but dynamic | |
334 | abbrev expansion happens only when you request it explicitly. | |
6bf7aab6 DL |
335 | |
336 | @kindex M-/ | |
337 | @kindex C-M-/ | |
338 | @findex dabbrev-expand | |
339 | @findex dabbrev-completion | |
340 | @table @kbd | |
341 | @item M-/ | |
342 | Expand the word in the buffer before point as a @dfn{dynamic abbrev}, | |
343 | by searching in the buffer for words starting with that abbreviation | |
344 | (@code{dabbrev-expand}). | |
345 | ||
346 | @item C-M-/ | |
347 | Complete the word before point as a dynamic abbrev | |
348 | (@code{dabbrev-completion}). | |
349 | @end table | |
350 | ||
351 | @vindex dabbrev-limit | |
352 | For example, if the buffer contains @samp{does this follow } and you | |
353 | type @kbd{f o M-/}, the effect is to insert @samp{follow} because that | |
354 | is the last word in the buffer that starts with @samp{fo}. A numeric | |
355 | argument to @kbd{M-/} says to take the second, third, etc.@: distinct | |
356 | expansion found looking backward from point. Repeating @kbd{M-/} | |
357 | searches for an alternative expansion by looking farther back. After | |
358 | scanning all the text before point, it searches the text after point. | |
359 | The variable @code{dabbrev-limit}, if non-@code{nil}, specifies how far | |
3f7ba267 | 360 | away in the buffer to search for an expansion. |
6bf7aab6 DL |
361 | |
362 | @vindex dabbrev-check-all-buffers | |
363 | After scanning the current buffer, @kbd{M-/} normally searches other | |
364 | buffers, unless you have set @code{dabbrev-check-all-buffers} to | |
365 | @code{nil}. | |
366 | ||
78cab5d8 | 367 | @vindex dabbrev-ignored-buffer-regexps |
36710aa6 GM |
368 | For finer control over which buffers to scan, customize the variable |
369 | @code{dabbrev-ignored-buffer-regexps}. Its value is a list of regular | |
370 | expressions. If a buffer's name matches any of these regular | |
371 | expressions, dynamic abbrev expansion skips that buffer. | |
0a396e5a | 372 | |
6bf7aab6 | 373 | A negative argument to @kbd{M-/}, as in @kbd{C-u - M-/}, says to |
6a080ff1 | 374 | search first for expansions after point, then other buffers, and |
3f7ba267 RS |
375 | consider expansions before point only as a last resort. If you repeat |
376 | the @kbd{M-/} to look for another expansion, do not specify an | |
377 | argument. Repeating @kbd{M-/} cycles through all the expansions after | |
378 | point and then the expansions before point. | |
6bf7aab6 DL |
379 | |
380 | After you have expanded a dynamic abbrev, you can copy additional | |
381 | words that follow the expansion in its original context. Simply type | |
3f7ba267 RS |
382 | @kbd{@key{SPC} M-/} for each additional word you want to copy. The |
383 | spacing and punctuation between words is copied along with the words. | |
6bf7aab6 DL |
384 | |
385 | The command @kbd{C-M-/} (@code{dabbrev-completion}) performs | |
3f7ba267 RS |
386 | completion of a dynamic abbrev. Instead of trying the possible |
387 | expansions one by one, it finds all of them, then inserts the text | |
388 | that they have in common. If they have nothing in common, @kbd{C-M-/} | |
6bf7aab6 DL |
389 | displays a list of completions, from which you can select a choice in |
390 | the usual manner. @xref{Completion}. | |
391 | ||
392 | Dynamic abbrev expansion is completely independent of Abbrev mode; the | |
393 | expansion of a word with @kbd{M-/} is completely independent of whether | |
394 | it has a definition as an ordinary abbrev. | |
395 | ||
396 | @node Dabbrev Customization | |
397 | @section Customizing Dynamic Abbreviation | |
398 | ||
399 | Normally, dynamic abbrev expansion ignores case when searching for | |
400 | expansions. That is, the expansion need not agree in case with the word | |
401 | you are expanding. | |
402 | ||
403 | @vindex dabbrev-case-fold-search | |
404 | This feature is controlled by the variable | |
c40a7de7 CY |
405 | @code{dabbrev-case-fold-search}. If it is @code{t}, case is ignored |
406 | in this search; if it is @code{nil}, the word and the expansion must | |
407 | match in case. If the value is @code{case-fold-search} (the default), | |
408 | then the variable @code{case-fold-search} controls whether to ignore | |
409 | case while searching for expansions (@pxref{Search Case}). | |
6bf7aab6 DL |
410 | |
411 | @vindex dabbrev-case-replace | |
3f7ba267 RS |
412 | Normally, dynamic abbrev expansion preserves the case pattern |
413 | @emph{of the dynamic abbrev you are expanding}, by converting the | |
414 | expansion to that case pattern. | |
6bf7aab6 DL |
415 | |
416 | @vindex dabbrev-case-fold-search | |
3f7ba267 RS |
417 | The variable @code{dabbrev-case-replace} controls whether to |
418 | preserve the case pattern of the dynamic abbrev. If it is @code{t}, | |
419 | the dynamic abbrev's case pattern is preserved in most cases; if it is | |
c40a7de7 CY |
420 | @code{nil}, the expansion is always copied verbatim. If the value is |
421 | @code{case-replace} (the default), then the variable | |
422 | @code{case-replace} controls whether to copy the expansion verbatim | |
423 | (@pxref{Replacement and Case}). | |
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424 | |
425 | However, if the expansion contains a complex mixed case pattern, and | |
3f7ba267 RS |
426 | the dynamic abbrev matches this pattern as far as it goes, then the |
427 | expansion is always copied verbatim, regardless of those variables. | |
428 | Thus, for example, if the buffer contains | |
429 | @code{variableWithSillyCasePattern}, and you type @kbd{v a M-/}, it | |
430 | copies the expansion verbatim including its case pattern. | |
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431 | |
432 | @vindex dabbrev-abbrev-char-regexp | |
433 | The variable @code{dabbrev-abbrev-char-regexp}, if non-@code{nil}, | |
434 | controls which characters are considered part of a word, for dynamic expansion | |
435 | purposes. The regular expression must match just one character, never | |
436 | two or more. The same regular expression also determines which | |
437 | characters are part of an expansion. The value @code{nil} has a special | |
3f7ba267 | 438 | meaning: dynamic abbrevs are made of word characters, but expansions are |
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439 | made of word and symbol characters. |
440 | ||
441 | @vindex dabbrev-abbrev-skip-leading-regexp | |
442 | In shell scripts and makefiles, a variable name is sometimes prefixed | |
443 | with @samp{$} and sometimes not. Major modes for this kind of text can | |
3f7ba267 | 444 | customize dynamic abbrev expansion to handle optional prefixes by setting |
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445 | the variable @code{dabbrev-abbrev-skip-leading-regexp}. Its value |
446 | should be a regular expression that matches the optional prefix that | |
3f7ba267 | 447 | dynamic abbrev expression should ignore. |