forked from git/git
-
Notifications
You must be signed in to change notification settings - Fork 1
Expand file tree
/
Copy pathapi-merge.html
More file actions
578 lines (537 loc) · 11.8 KB
/
api-merge.html
File metadata and controls
578 lines (537 loc) · 11.8 KB
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
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN"
"http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<meta name="generator" content="AsciiDoc 8.4.5" />
<title>merge API</title>
<style type="text/css">
/* Debug borders */
p, li, dt, dd, div, pre, h1, h2, h3, h4, h5, h6 {
/*
border: 1px solid red;
*/
}
body {
margin: 1em 5% 1em 5%;
}
a {
color: blue;
text-decoration: underline;
}
a:visited {
color: fuchsia;
}
em {
font-style: italic;
color: navy;
}
strong {
font-weight: bold;
color: #083194;
}
tt {
color: navy;
}
h1, h2, h3, h4, h5, h6 {
color: #527bbd;
font-family: sans-serif;
margin-top: 1.2em;
margin-bottom: 0.5em;
line-height: 1.3;
}
h1, h2, h3 {
border-bottom: 2px solid silver;
}
h2 {
padding-top: 0.5em;
}
h3 {
float: left;
}
h3 + * {
clear: left;
}
div.sectionbody {
font-family: serif;
margin-left: 0;
}
hr {
border: 1px solid silver;
}
p {
margin-top: 0.5em;
margin-bottom: 0.5em;
}
ul, ol, li > p {
margin-top: 0;
}
pre {
padding: 0;
margin: 0;
}
span#author {
color: #527bbd;
font-family: sans-serif;
font-weight: bold;
font-size: 1.1em;
}
span#email {
}
span#revnumber, span#revdate, span#revremark {
font-family: sans-serif;
}
div#footer {
font-family: sans-serif;
font-size: small;
border-top: 2px solid silver;
padding-top: 0.5em;
margin-top: 4.0em;
}
div#footer-text {
float: left;
padding-bottom: 0.5em;
}
div#footer-badges {
float: right;
padding-bottom: 0.5em;
}
div#preamble {
margin-top: 1.5em;
margin-bottom: 1.5em;
}
div.tableblock, div.imageblock, div.exampleblock, div.verseblock,
div.quoteblock, div.literalblock, div.listingblock, div.sidebarblock,
div.admonitionblock {
margin-top: 1.5em;
margin-bottom: 1.5em;
}
div.admonitionblock {
margin-top: 2.5em;
margin-bottom: 2.5em;
}
div.content { /* Block element content. */
padding: 0;
}
/* Block element titles. */
div.title, caption.title {
color: #527bbd;
font-family: sans-serif;
font-weight: bold;
text-align: left;
margin-top: 1.0em;
margin-bottom: 0.5em;
}
div.title + * {
margin-top: 0;
}
td div.title:first-child {
margin-top: 0.0em;
}
div.content div.title:first-child {
margin-top: 0.0em;
}
div.content + div.title {
margin-top: 0.0em;
}
div.sidebarblock > div.content {
background: #ffffee;
border: 1px solid silver;
padding: 0.5em;
}
div.listingblock > div.content {
border: 1px solid silver;
background: #f4f4f4;
padding: 0.5em;
}
div.quoteblock {
padding-left: 2.0em;
margin-right: 10%;
}
div.quoteblock > div.attribution {
padding-top: 0.5em;
text-align: right;
}
div.verseblock {
padding-left: 2.0em;
margin-right: 10%;
}
div.verseblock > div.content {
white-space: pre;
}
div.verseblock > div.attribution {
padding-top: 0.75em;
text-align: left;
}
/* DEPRECATED: Pre version 8.2.7 verse style literal block. */
div.verseblock + div.attribution {
text-align: left;
}
div.admonitionblock .icon {
vertical-align: top;
font-size: 1.1em;
font-weight: bold;
text-decoration: underline;
color: #527bbd;
padding-right: 0.5em;
}
div.admonitionblock td.content {
padding-left: 0.5em;
border-left: 2px solid silver;
}
div.exampleblock > div.content {
border-left: 2px solid silver;
padding: 0.5em;
}
div.imageblock div.content { padding-left: 0; }
span.image img { border-style: none; }
a.image:visited { color: white; }
dl {
margin-top: 0.8em;
margin-bottom: 0.8em;
}
dt {
margin-top: 0.5em;
margin-bottom: 0;
font-style: normal;
color: navy;
}
dd > *:first-child {
margin-top: 0.1em;
}
ul, ol {
list-style-position: outside;
}
ol.arabic {
list-style-type: decimal;
}
ol.loweralpha {
list-style-type: lower-alpha;
}
ol.upperalpha {
list-style-type: upper-alpha;
}
ol.lowerroman {
list-style-type: lower-roman;
}
ol.upperroman {
list-style-type: upper-roman;
}
div.compact ul, div.compact ol,
div.compact p, div.compact p,
div.compact div, div.compact div {
margin-top: 0.1em;
margin-bottom: 0.1em;
}
div.tableblock > table {
border: 3px solid #527bbd;
}
thead {
font-family: sans-serif;
font-weight: bold;
}
tfoot {
font-weight: bold;
}
td > div.verse {
white-space: pre;
}
p.table {
margin-top: 0;
}
/* Because the table frame attribute is overriden by CSS in most browsers. */
div.tableblock > table[frame="void"] {
border-style: none;
}
div.tableblock > table[frame="hsides"] {
border-left-style: none;
border-right-style: none;
}
div.tableblock > table[frame="vsides"] {
border-top-style: none;
border-bottom-style: none;
}
div.hdlist {
margin-top: 0.8em;
margin-bottom: 0.8em;
}
div.hdlist tr {
padding-bottom: 15px;
}
dt.hdlist1.strong, td.hdlist1.strong {
font-weight: bold;
}
td.hdlist1 {
vertical-align: top;
font-style: normal;
padding-right: 0.8em;
color: navy;
}
td.hdlist2 {
vertical-align: top;
}
div.hdlist.compact tr {
margin: 0;
padding-bottom: 0;
}
.comment {
background: yellow;
}
@media print {
div#footer-badges { display: none; }
}
div#toctitle {
color: #527bbd;
font-family: sans-serif;
font-size: 1.1em;
font-weight: bold;
margin-top: 1.0em;
margin-bottom: 0.1em;
}
div.toclevel1, div.toclevel2, div.toclevel3, div.toclevel4 {
margin-top: 0;
margin-bottom: 0;
}
div.toclevel2 {
margin-left: 2em;
font-size: 0.9em;
}
div.toclevel3 {
margin-left: 4em;
font-size: 0.9em;
}
div.toclevel4 {
margin-left: 6em;
font-size: 0.9em;
}
/* Workarounds for IE6's broken and incomplete CSS2. */
div.sidebar-content {
background: #ffffee;
border: 1px solid silver;
padding: 0.5em;
}
div.sidebar-title, div.image-title {
color: #527bbd;
font-family: sans-serif;
font-weight: bold;
margin-top: 0.0em;
margin-bottom: 0.5em;
}
div.listingblock div.content {
border: 1px solid silver;
background: #f4f4f4;
padding: 0.5em;
}
div.quoteblock-attribution {
padding-top: 0.5em;
text-align: right;
}
div.verseblock-content {
white-space: pre;
}
div.verseblock-attribution {
padding-top: 0.75em;
text-align: left;
}
div.exampleblock-content {
border-left: 2px solid silver;
padding-left: 0.5em;
}
/* IE6 sets dynamically generated links as visited. */
div#toc a:visited { color: blue; }
</style>
</head>
<body>
<div id="header">
<h1>merge API</h1>
</div>
<div id="preamble">
<div class="sectionbody">
<div class="paragraph"><p>The merge API helps a program to reconcile two competing sets of
improvements to some files (e.g., unregistered changes from the work
tree versus changes involved in switching to a new branch), reporting
conflicts if found. The library called through this API is
responsible for a few things.</p></div>
<div class="ulist"><ul>
<li>
<p>
determining which trees to merge (recursive ancestor consolidation);
</p>
</li>
<li>
<p>
lining up corresponding files in the trees to be merged (rename
detection, subtree shifting), reporting edge cases like add/add
and rename/rename conflicts to the user;
</p>
</li>
<li>
<p>
performing a three-way merge of corresponding files, taking
path-specific merge drivers (specified in <tt>.gitattributes</tt>)
into account.
</p>
</li>
</ul></div>
</div>
</div>
<h2 id="_data_structures">Data structures</h2>
<div class="sectionbody">
<div class="ulist"><ul>
<li>
<p>
<tt>mmbuffer_t</tt>, <tt>mmfile_t</tt>
</p>
</li>
</ul></div>
<div class="paragraph"><p>These store data usable for use by the xdiff backend, for writing and
for reading, respectively. See <tt>xdiff/xdiff.h</tt> for the definitions
and <tt>diff.c</tt> for examples.</p></div>
<div class="ulist"><ul>
<li>
<p>
<tt>struct ll_merge_options</tt>
</p>
</li>
</ul></div>
<div class="paragraph"><p>This describes the set of options the calling program wants to affect
the operation of a low-level (single file) merge. Some options:</p></div>
<div class="dlist"><dl>
<dt class="hdlist1">
<tt>virtual_ancestor</tt>
</dt>
<dd>
<p>
Behave as though this were part of a merge between common
ancestors in a recursive merge.
If a helper program is specified by the
<tt>[merge "<driver>"] recursive</tt> configuration, it will
be used (see <a href="gitattributes.html">gitattributes(5)</a>).
</p>
</dd>
<dt class="hdlist1">
<tt>variant</tt>
</dt>
<dd>
<p>
Resolve local conflicts automatically in favor
of one side or the other (as in <em>git merge-file</em>
<tt>--ours</tt>/<tt>--theirs</tt>/<tt>--union</tt>). Can be <tt>0</tt>,
<tt>XDL_MERGE_FAVOR_OURS</tt>, <tt>XDL_MERGE_FAVOR_THEIRS</tt>, or
<tt>XDL_MERGE_FAVOR_UNION</tt>.
</p>
</dd>
<dt class="hdlist1">
<tt>renormalize</tt>
</dt>
<dd>
<p>
Resmudge and clean the "base", "theirs" and "ours" files
before merging. Use this when the merge is likely to have
overlapped with a change in smudge/clean or end-of-line
normalization rules.
</p>
</dd>
</dl></div>
</div>
<h2 id="_low_level_single_file_merge">Low-level (single file) merge</h2>
<div class="sectionbody">
<div class="dlist"><dl>
<dt class="hdlist1">
<tt>ll_merge</tt>
</dt>
<dd>
<p>
Perform a three-way single-file merge in core. This is
a thin wrapper around <tt>xdl_merge</tt> that takes the path and
any merge backend specified in <tt>.gitattributes</tt> or
<tt>.git/info/attributes</tt> into account. Returns 0 for a
clean merge.
</p>
</dd>
</dl></div>
<div class="paragraph"><p>Calling sequence:</p></div>
<div class="ulist"><ul>
<li>
<p>
Prepare a <tt>struct ll_merge_options</tt> to record options.
If you have no special requests, skip this and pass <tt>NULL</tt>
as the <tt>opts</tt> parameter to use the default options.
</p>
</li>
<li>
<p>
Allocate an mmbuffer_t variable for the result.
</p>
</li>
<li>
<p>
Allocate and fill variables with the file’s original content
and two modified versions (using <tt>read_mmfile</tt>, for example).
</p>
</li>
<li>
<p>
Call <tt>ll_merge()</tt>.
</p>
</li>
<li>
<p>
Read the merged content from <tt>result_buf.ptr</tt> and <tt>result_buf.size</tt>.
</p>
</li>
<li>
<p>
Release buffers when finished. A simple
<tt>free(ancestor.ptr); free(ours.ptr); free(theirs.ptr);
free(result_buf.ptr);</tt> will do.
</p>
</li>
</ul></div>
<div class="paragraph"><p>If the modifications do not merge cleanly, <tt>ll_merge</tt> will return a
nonzero value and <tt>result_buf</tt> will generally include a description of
the conflict bracketed by markers such as the traditional <tt><<<<<<<</tt>
and <tt>>>>>>>></tt>.</p></div>
<div class="paragraph"><p>The <tt>ancestor_label</tt>, <tt>our_label</tt>, and <tt>their_label</tt> parameters are
used to label the different sides of a conflict if the merge driver
supports this.</p></div>
</div>
<h2 id="_everything_else">Everything else</h2>
<div class="sectionbody">
<div class="paragraph"><p>Talk about <merge-recursive.h> and merge_file():</p></div>
<div class="ulist"><ul>
<li>
<p>
merge_trees() to merge with rename detection
</p>
</li>
<li>
<p>
merge_recursive() for ancestor consolidation
</p>
</li>
<li>
<p>
try_merge_command() for other strategies
</p>
</li>
<li>
<p>
conflict format
</p>
</li>
<li>
<p>
merge options
</p>
</li>
</ul></div>
<div class="paragraph"><p>(Daniel, Miklos, Stephan, JC)</p></div>
</div>
<div id="footer">
<div id="footer-text">
Last updated 2010-11-06 00:41:57 UTC
</div>
</div>
</body>
</html>