GIT 1.5.0
[git/git.git] / diff.c
CommitLineData
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1/*
2 * Copyright (C) 2005 Junio C Hamano
3 */
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4#include "cache.h"
5#include "quote.h"
6#include "diff.h"
7#include "diffcore.h"
051308f6 8#include "delta.h"
6973dcae 9#include "xdiff-interface.h"
7c92fe0e 10#include "color.h"
6973dcae 11
1510fea7
SP
12#ifdef NO_FAST_WORKING_DIRECTORY
13#define FAST_WORKING_DIRECTORY 0
14#else
15#define FAST_WORKING_DIRECTORY 1
16#endif
17
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18static int use_size_cache;
19
96f1e58f 20static int diff_detect_rename_default;
801235c5 21static int diff_rename_limit_default = -1;
96f1e58f 22static int diff_use_color_default;
6973dcae 23
7c92fe0e 24static char diff_colors[][COLOR_MAXLEN] = {
f37399e6 25 "\033[m", /* reset */
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26 "", /* PLAIN (normal) */
27 "\033[1m", /* METAINFO (bold) */
28 "\033[36m", /* FRAGINFO (cyan) */
29 "\033[31m", /* OLD (red) */
30 "\033[32m", /* NEW (green) */
31 "\033[33m", /* COMMIT (yellow) */
32 "\033[41m", /* WHITESPACE (red background) */
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33};
34
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35static int parse_diff_color_slot(const char *var, int ofs)
36{
37 if (!strcasecmp(var+ofs, "plain"))
38 return DIFF_PLAIN;
39 if (!strcasecmp(var+ofs, "meta"))
40 return DIFF_METAINFO;
41 if (!strcasecmp(var+ofs, "frag"))
42 return DIFF_FRAGINFO;
43 if (!strcasecmp(var+ofs, "old"))
44 return DIFF_FILE_OLD;
45 if (!strcasecmp(var+ofs, "new"))
46 return DIFF_FILE_NEW;
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47 if (!strcasecmp(var+ofs, "commit"))
48 return DIFF_COMMIT;
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49 if (!strcasecmp(var+ofs, "whitespace"))
50 return DIFF_WHITESPACE;
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51 die("bad config variable '%s'", var);
52}
53
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54/*
55 * These are to give UI layer defaults.
56 * The core-level commands such as git-diff-files should
57 * never be affected by the setting of diff.renames
58 * the user happens to have in the configuration file.
59 */
60int git_diff_ui_config(const char *var, const char *value)
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61{
62 if (!strcmp(var, "diff.renamelimit")) {
63 diff_rename_limit_default = git_config_int(var, value);
64 return 0;
65 }
a159ca0c 66 if (!strcmp(var, "diff.color") || !strcmp(var, "color.diff")) {
7c92fe0e 67 diff_use_color_default = git_config_colorbool(var, value);
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68 return 0;
69 }
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70 if (!strcmp(var, "diff.renames")) {
71 if (!value)
72 diff_detect_rename_default = DIFF_DETECT_RENAME;
73 else if (!strcasecmp(value, "copies") ||
74 !strcasecmp(value, "copy"))
75 diff_detect_rename_default = DIFF_DETECT_COPY;
76 else if (git_config_bool(var,value))
77 diff_detect_rename_default = DIFF_DETECT_RENAME;
78 return 0;
79 }
a159ca0c 80 if (!strncmp(var, "diff.color.", 11) || !strncmp(var, "color.diff.", 11)) {
801235c5 81 int slot = parse_diff_color_slot(var, 11);
7c92fe0e 82 color_parse(value, var, diff_colors[slot]);
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83 return 0;
84 }
85 return git_default_config(var, value);
86}
87
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88static char *quote_one(const char *str)
89{
90 int needlen;
91 char *xp;
92
93 if (!str)
94 return NULL;
95 needlen = quote_c_style(str, NULL, NULL, 0);
96 if (!needlen)
9befac47 97 return xstrdup(str);
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98 xp = xmalloc(needlen + 1);
99 quote_c_style(str, xp, NULL, 0);
100 return xp;
101}
102
103static char *quote_two(const char *one, const char *two)
104{
105 int need_one = quote_c_style(one, NULL, NULL, 1);
106 int need_two = quote_c_style(two, NULL, NULL, 1);
107 char *xp;
108
109 if (need_one + need_two) {
110 if (!need_one) need_one = strlen(one);
111 if (!need_two) need_one = strlen(two);
112
113 xp = xmalloc(need_one + need_two + 3);
114 xp[0] = '"';
115 quote_c_style(one, xp + 1, NULL, 1);
116 quote_c_style(two, xp + need_one + 1, NULL, 1);
117 strcpy(xp + need_one + need_two + 1, "\"");
118 return xp;
119 }
120 need_one = strlen(one);
121 need_two = strlen(two);
122 xp = xmalloc(need_one + need_two + 1);
123 strcpy(xp, one);
124 strcpy(xp + need_one, two);
125 return xp;
126}
127
128static const char *external_diff(void)
129{
130 static const char *external_diff_cmd = NULL;
131 static int done_preparing = 0;
132
133 if (done_preparing)
134 return external_diff_cmd;
135 external_diff_cmd = getenv("GIT_EXTERNAL_DIFF");
136 done_preparing = 1;
137 return external_diff_cmd;
138}
139
140#define TEMPFILE_PATH_LEN 50
141
142static struct diff_tempfile {
143 const char *name; /* filename external diff should read from */
144 char hex[41];
145 char mode[10];
146 char tmp_path[TEMPFILE_PATH_LEN];
147} diff_temp[2];
148
149static int count_lines(const char *data, int size)
150{
151 int count, ch, completely_empty = 1, nl_just_seen = 0;
152 count = 0;
153 while (0 < size--) {
154 ch = *data++;
155 if (ch == '\n') {
156 count++;
157 nl_just_seen = 1;
158 completely_empty = 0;
159 }
160 else {
161 nl_just_seen = 0;
162 completely_empty = 0;
163 }
164 }
165 if (completely_empty)
166 return 0;
167 if (!nl_just_seen)
168 count++; /* no trailing newline */
169 return count;
170}
171
172static void print_line_count(int count)
173{
174 switch (count) {
175 case 0:
176 printf("0,0");
177 break;
178 case 1:
179 printf("1");
180 break;
181 default:
182 printf("1,%d", count);
183 break;
184 }
185}
186
187static void copy_file(int prefix, const char *data, int size)
188{
189 int ch, nl_just_seen = 1;
190 while (0 < size--) {
191 ch = *data++;
192 if (nl_just_seen)
193 putchar(prefix);
194 putchar(ch);
195 if (ch == '\n')
196 nl_just_seen = 1;
197 else
198 nl_just_seen = 0;
199 }
200 if (!nl_just_seen)
201 printf("\n\\ No newline at end of file\n");
202}
203
204static void emit_rewrite_diff(const char *name_a,
205 const char *name_b,
206 struct diff_filespec *one,
207 struct diff_filespec *two)
208{
209 int lc_a, lc_b;
210 diff_populate_filespec(one, 0);
211 diff_populate_filespec(two, 0);
212 lc_a = count_lines(one->data, one->size);
213 lc_b = count_lines(two->data, two->size);
bc1a5807 214 printf("--- a/%s\n+++ b/%s\n@@ -", name_a, name_b);
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215 print_line_count(lc_a);
216 printf(" +");
217 print_line_count(lc_b);
218 printf(" @@\n");
219 if (lc_a)
220 copy_file('-', one->data, one->size);
221 if (lc_b)
222 copy_file('+', two->data, two->size);
223}
224
225static int fill_mmfile(mmfile_t *mf, struct diff_filespec *one)
226{
227 if (!DIFF_FILE_VALID(one)) {
d2543b8e 228 mf->ptr = (char *)""; /* does not matter */
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229 mf->size = 0;
230 return 0;
231 }
232 else if (diff_populate_filespec(one, 0))
233 return -1;
234 mf->ptr = one->data;
235 mf->size = one->size;
236 return 0;
237}
238
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239struct diff_words_buffer {
240 mmfile_t text;
241 long alloc;
242 long current; /* output pointer */
243 int suppressed_newline;
244};
245
246static void diff_words_append(char *line, unsigned long len,
247 struct diff_words_buffer *buffer)
248{
249 if (buffer->text.size + len > buffer->alloc) {
250 buffer->alloc = (buffer->text.size + len) * 3 / 2;
251 buffer->text.ptr = xrealloc(buffer->text.ptr, buffer->alloc);
252 }
253 line++;
254 len--;
255 memcpy(buffer->text.ptr + buffer->text.size, line, len);
256 buffer->text.size += len;
257}
258
259struct diff_words_data {
260 struct xdiff_emit_state xm;
261 struct diff_words_buffer minus, plus;
262};
263
264static void print_word(struct diff_words_buffer *buffer, int len, int color,
265 int suppress_newline)
266{
267 const char *ptr;
268 int eol = 0;
269
270 if (len == 0)
271 return;
272
273 ptr = buffer->text.ptr + buffer->current;
274 buffer->current += len;
275
276 if (ptr[len - 1] == '\n') {
277 eol = 1;
278 len--;
279 }
280
281 fputs(diff_get_color(1, color), stdout);
282 fwrite(ptr, len, 1, stdout);
283 fputs(diff_get_color(1, DIFF_RESET), stdout);
284
285 if (eol) {
286 if (suppress_newline)
287 buffer->suppressed_newline = 1;
288 else
289 putchar('\n');
290 }
291}
292
293static void fn_out_diff_words_aux(void *priv, char *line, unsigned long len)
294{
295 struct diff_words_data *diff_words = priv;
296
297 if (diff_words->minus.suppressed_newline) {
298 if (line[0] != '+')
299 putchar('\n');
300 diff_words->minus.suppressed_newline = 0;
301 }
302
303 len--;
304 switch (line[0]) {
305 case '-':
306 print_word(&diff_words->minus, len, DIFF_FILE_OLD, 1);
307 break;
308 case '+':
309 print_word(&diff_words->plus, len, DIFF_FILE_NEW, 0);
310 break;
311 case ' ':
312 print_word(&diff_words->plus, len, DIFF_PLAIN, 0);
313 diff_words->minus.current += len;
314 break;
315 }
316}
317
318/* this executes the word diff on the accumulated buffers */
319static void diff_words_show(struct diff_words_data *diff_words)
320{
321 xpparam_t xpp;
322 xdemitconf_t xecfg;
323 xdemitcb_t ecb;
324 mmfile_t minus, plus;
325 int i;
326
327 minus.size = diff_words->minus.text.size;
328 minus.ptr = xmalloc(minus.size);
329 memcpy(minus.ptr, diff_words->minus.text.ptr, minus.size);
330 for (i = 0; i < minus.size; i++)
331 if (isspace(minus.ptr[i]))
332 minus.ptr[i] = '\n';
333 diff_words->minus.current = 0;
334
335 plus.size = diff_words->plus.text.size;
336 plus.ptr = xmalloc(plus.size);
337 memcpy(plus.ptr, diff_words->plus.text.ptr, plus.size);
338 for (i = 0; i < plus.size; i++)
339 if (isspace(plus.ptr[i]))
340 plus.ptr[i] = '\n';
341 diff_words->plus.current = 0;
342
343 xpp.flags = XDF_NEED_MINIMAL;
344 xecfg.ctxlen = diff_words->minus.alloc + diff_words->plus.alloc;
345 xecfg.flags = 0;
346 ecb.outf = xdiff_outf;
347 ecb.priv = diff_words;
348 diff_words->xm.consume = fn_out_diff_words_aux;
349 xdl_diff(&minus, &plus, &xpp, &xecfg, &ecb);
350
351 free(minus.ptr);
352 free(plus.ptr);
353 diff_words->minus.text.size = diff_words->plus.text.size = 0;
354
355 if (diff_words->minus.suppressed_newline) {
356 putchar('\n');
357 diff_words->minus.suppressed_newline = 0;
358 }
359}
360
6973dcae 361struct emit_callback {
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362 struct xdiff_emit_state xm;
363 int nparents, color_diff;
6973dcae 364 const char **label_path;
f59a59e2 365 struct diff_words_data *diff_words;
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366};
367
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368static void free_diff_words_data(struct emit_callback *ecbdata)
369{
370 if (ecbdata->diff_words) {
371 /* flush buffers */
372 if (ecbdata->diff_words->minus.text.size ||
373 ecbdata->diff_words->plus.text.size)
374 diff_words_show(ecbdata->diff_words);
375
376 if (ecbdata->diff_words->minus.text.ptr)
377 free (ecbdata->diff_words->minus.text.ptr);
378 if (ecbdata->diff_words->plus.text.ptr)
379 free (ecbdata->diff_words->plus.text.ptr);
380 free(ecbdata->diff_words);
381 ecbdata->diff_words = NULL;
382 }
383}
384
ce436973 385const char *diff_get_color(int diff_use_color, enum color_diff ix)
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386{
387 if (diff_use_color)
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388 return diff_colors[ix];
389 return "";
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390}
391
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392static void emit_line(const char *set, const char *reset, const char *line, int len)
393{
394 if (len > 0 && line[len-1] == '\n')
395 len--;
396 fputs(set, stdout);
397 fwrite(line, len, 1, stdout);
398 puts(reset);
399}
400
401static void emit_add_line(const char *reset, struct emit_callback *ecbdata, const char *line, int len)
402{
403 int col0 = ecbdata->nparents;
404 int last_tab_in_indent = -1;
405 int last_space_in_indent = -1;
406 int i;
407 int tail = len;
408 int need_highlight_leading_space = 0;
409 const char *ws = diff_get_color(ecbdata->color_diff, DIFF_WHITESPACE);
410 const char *set = diff_get_color(ecbdata->color_diff, DIFF_FILE_NEW);
411
412 if (!*ws) {
413 emit_line(set, reset, line, len);
414 return;
415 }
416
417 /* The line is a newly added line. Does it have funny leading
418 * whitespaces? In indent, SP should never precede a TAB.
419 */
420 for (i = col0; i < len; i++) {
421 if (line[i] == '\t') {
422 last_tab_in_indent = i;
423 if (0 <= last_space_in_indent)
424 need_highlight_leading_space = 1;
425 }
426 else if (line[i] == ' ')
427 last_space_in_indent = i;
428 else
429 break;
430 }
431 fputs(set, stdout);
432 fwrite(line, col0, 1, stdout);
433 fputs(reset, stdout);
434 if (((i == len) || line[i] == '\n') && i != col0) {
435 /* The whole line was indent */
436 emit_line(ws, reset, line + col0, len - col0);
437 return;
438 }
439 i = col0;
440 if (need_highlight_leading_space) {
441 while (i < last_tab_in_indent) {
442 if (line[i] == ' ') {
443 fputs(ws, stdout);
444 putchar(' ');
445 fputs(reset, stdout);
446 }
447 else
448 putchar(line[i]);
449 i++;
450 }
451 }
452 tail = len - 1;
453 if (line[tail] == '\n' && i < tail)
454 tail--;
455 while (i < tail) {
456 if (!isspace(line[tail]))
457 break;
458 tail--;
459 }
460 if ((i < tail && line[tail + 1] != '\n')) {
461 /* This has whitespace between tail+1..len */
462 fputs(set, stdout);
463 fwrite(line + i, tail - i + 1, 1, stdout);
464 fputs(reset, stdout);
465 emit_line(ws, reset, line + tail + 1, len - tail - 1);
466 }
467 else
468 emit_line(set, reset, line + i, len - i);
469}
470
cd112cef 471static void fn_out_consume(void *priv, char *line, unsigned long len)
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472{
473 int i;
448c3ef1 474 int color;
6973dcae 475 struct emit_callback *ecbdata = priv;
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476 const char *set = diff_get_color(ecbdata->color_diff, DIFF_METAINFO);
477 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
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478
479 if (ecbdata->label_path[0]) {
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LT
480 printf("%s--- %s%s\n", set, ecbdata->label_path[0], reset);
481 printf("%s+++ %s%s\n", set, ecbdata->label_path[1], reset);
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482 ecbdata->label_path[0] = ecbdata->label_path[1] = NULL;
483 }
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484
485 /* This is not really necessary for now because
486 * this codepath only deals with two-way diffs.
487 */
488 for (i = 0; i < len && line[i] == '@'; i++)
489 ;
490 if (2 <= i && i < len && line[i] == ' ') {
491 ecbdata->nparents = i - 1;
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492 emit_line(diff_get_color(ecbdata->color_diff, DIFF_FRAGINFO),
493 reset, line, len);
494 return;
cd112cef 495 }
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496
497 if (len < ecbdata->nparents) {
50f575fc 498 set = reset;
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499 emit_line(reset, reset, line, len);
500 return;
cd112cef 501 }
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502
503 color = DIFF_PLAIN;
504 if (ecbdata->diff_words && ecbdata->nparents != 1)
505 /* fall back to normal diff */
506 free_diff_words_data(ecbdata);
507 if (ecbdata->diff_words) {
508 if (line[0] == '-') {
509 diff_words_append(line, len,
510 &ecbdata->diff_words->minus);
511 return;
512 } else if (line[0] == '+') {
513 diff_words_append(line, len,
514 &ecbdata->diff_words->plus);
515 return;
516 }
517 if (ecbdata->diff_words->minus.text.size ||
518 ecbdata->diff_words->plus.text.size)
519 diff_words_show(ecbdata->diff_words);
520 line++;
50f575fc 521 len--;
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522 emit_line(set, reset, line, len);
523 return;
524 }
525 for (i = 0; i < ecbdata->nparents && len; i++) {
526 if (line[i] == '-')
527 color = DIFF_FILE_OLD;
528 else if (line[i] == '+')
529 color = DIFF_FILE_NEW;
530 }
531
532 if (color != DIFF_FILE_NEW) {
533 emit_line(diff_get_color(ecbdata->color_diff, color),
534 reset, line, len);
535 return;
536 }
537 emit_add_line(reset, ecbdata, line, len);
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538}
539
540static char *pprint_rename(const char *a, const char *b)
541{
542 const char *old = a;
543 const char *new = b;
544 char *name = NULL;
545 int pfx_length, sfx_length;
546 int len_a = strlen(a);
547 int len_b = strlen(b);
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548 int qlen_a = quote_c_style(a, NULL, NULL, 0);
549 int qlen_b = quote_c_style(b, NULL, NULL, 0);
550
551 if (qlen_a || qlen_b) {
552 if (qlen_a) len_a = qlen_a;
553 if (qlen_b) len_b = qlen_b;
554 name = xmalloc( len_a + len_b + 5 );
555 if (qlen_a)
556 quote_c_style(a, name, NULL, 0);
557 else
558 memcpy(name, a, len_a);
559 memcpy(name + len_a, " => ", 4);
560 if (qlen_b)
561 quote_c_style(b, name + len_a + 4, NULL, 0);
562 else
563 memcpy(name + len_a + 4, b, len_b + 1);
564 return name;
565 }
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566
567 /* Find common prefix */
568 pfx_length = 0;
569 while (*old && *new && *old == *new) {
570 if (*old == '/')
571 pfx_length = old - a + 1;
572 old++;
573 new++;
574 }
575
576 /* Find common suffix */
577 old = a + len_a;
578 new = b + len_b;
579 sfx_length = 0;
580 while (a <= old && b <= new && *old == *new) {
581 if (*old == '/')
582 sfx_length = len_a - (old - a);
583 old--;
584 new--;
585 }
586
587 /*
588 * pfx{mid-a => mid-b}sfx
589 * {pfx-a => pfx-b}sfx
590 * pfx{sfx-a => sfx-b}
591 * name-a => name-b
592 */
593 if (pfx_length + sfx_length) {
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594 int a_midlen = len_a - pfx_length - sfx_length;
595 int b_midlen = len_b - pfx_length - sfx_length;
596 if (a_midlen < 0) a_midlen = 0;
597 if (b_midlen < 0) b_midlen = 0;
598
e3008464 599 name = xmalloc(pfx_length + a_midlen + b_midlen + sfx_length + 7);
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600 sprintf(name, "%.*s{%.*s => %.*s}%s",
601 pfx_length, a,
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602 a_midlen, a + pfx_length,
603 b_midlen, b + pfx_length,
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604 a + len_a - sfx_length);
605 }
606 else {
607 name = xmalloc(len_a + len_b + 5);
608 sprintf(name, "%s => %s", a, b);
609 }
610 return name;
611}
612
613struct diffstat_t {
614 struct xdiff_emit_state xm;
615
616 int nr;
617 int alloc;
618 struct diffstat_file {
619 char *name;
620 unsigned is_unmerged:1;
621 unsigned is_binary:1;
622 unsigned is_renamed:1;
623 unsigned int added, deleted;
624 } **files;
625};
626
627static struct diffstat_file *diffstat_add(struct diffstat_t *diffstat,
628 const char *name_a,
629 const char *name_b)
630{
631 struct diffstat_file *x;
632 x = xcalloc(sizeof (*x), 1);
633 if (diffstat->nr == diffstat->alloc) {
634 diffstat->alloc = alloc_nr(diffstat->alloc);
635 diffstat->files = xrealloc(diffstat->files,
636 diffstat->alloc * sizeof(x));
637 }
638 diffstat->files[diffstat->nr++] = x;
639 if (name_b) {
640 x->name = pprint_rename(name_a, name_b);
641 x->is_renamed = 1;
642 }
643 else
9befac47 644 x->name = xstrdup(name_a);
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645 return x;
646}
647
648static void diffstat_consume(void *priv, char *line, unsigned long len)
649{
650 struct diffstat_t *diffstat = priv;
651 struct diffstat_file *x = diffstat->files[diffstat->nr - 1];
652
653 if (line[0] == '+')
654 x->added++;
655 else if (line[0] == '-')
656 x->deleted++;
657}
658
698ce6f8 659const char mime_boundary_leader[] = "------------";
6973dcae 660
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661static int scale_linear(int it, int width, int max_change)
662{
663 /*
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664 * make sure that at least one '-' is printed if there were deletions,
665 * and likewise for '+'.
a2540023 666 */
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667 if (max_change < 2)
668 return it;
669 return ((it - 1) * (width - 1) + max_change - 1) / (max_change - 1);
a2540023
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670}
671
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672static void show_name(const char *prefix, const char *name, int len,
673 const char *reset, const char *set)
a2540023 674{
785f7432 675 printf(" %s%s%-*s%s |", set, prefix, len, name, reset);
a2540023
JH
676}
677
785f7432 678static void show_graph(char ch, int cnt, const char *set, const char *reset)
a2540023
JH
679{
680 if (cnt <= 0)
681 return;
785f7432 682 printf("%s", set);
a2540023
JH
683 while (cnt--)
684 putchar(ch);
785f7432 685 printf("%s", reset);
a2540023
JH
686}
687
688static void show_stats(struct diffstat_t* data, struct diff_options *options)
6973dcae 689{
6973dcae 690 int i, len, add, del, total, adds = 0, dels = 0;
a2540023 691 int max_change = 0, max_len = 0;
6973dcae 692 int total_files = data->nr;
a2540023 693 int width, name_width;
785f7432 694 const char *reset, *set, *add_c, *del_c;
6973dcae
JH
695
696 if (data->nr == 0)
697 return;
698
a2540023
JH
699 width = options->stat_width ? options->stat_width : 80;
700 name_width = options->stat_name_width ? options->stat_name_width : 50;
701
702 /* Sanity: give at least 5 columns to the graph,
703 * but leave at least 10 columns for the name.
704 */
705 if (width < name_width + 15) {
706 if (name_width <= 25)
707 width = name_width + 15;
708 else
709 name_width = width - 15;
710 }
711
712 /* Find the longest filename and max number of changes */
785f7432
JH
713 reset = diff_get_color(options->color_diff, DIFF_RESET);
714 set = diff_get_color(options->color_diff, DIFF_PLAIN);
715 add_c = diff_get_color(options->color_diff, DIFF_FILE_NEW);
716 del_c = diff_get_color(options->color_diff, DIFF_FILE_OLD);
717
6973dcae
JH
718 for (i = 0; i < data->nr; i++) {
719 struct diffstat_file *file = data->files[i];
a2540023
JH
720 int change = file->added + file->deleted;
721
e5bfbf9b
AJ
722 if (!file->is_renamed) { /* renames are already quoted by pprint_rename */
723 len = quote_c_style(file->name, NULL, NULL, 0);
724 if (len) {
725 char *qname = xmalloc(len + 1);
726 quote_c_style(file->name, qname, NULL, 0);
727 free(file->name);
728 file->name = qname;
729 }
a2540023 730 }
6973dcae
JH
731
732 len = strlen(file->name);
733 if (max_len < len)
734 max_len = len;
735
736 if (file->is_binary || file->is_unmerged)
737 continue;
a2540023
JH
738 if (max_change < change)
739 max_change = change;
6973dcae
JH
740 }
741
a2540023
JH
742 /* Compute the width of the graph part;
743 * 10 is for one blank at the beginning of the line plus
744 * " | count " between the name and the graph.
745 *
746 * From here on, name_width is the width of the name area,
747 * and width is the width of the graph area.
748 */
749 name_width = (name_width < max_len) ? name_width : max_len;
750 if (width < (name_width + 10) + max_change)
751 width = width - (name_width + 10);
752 else
753 width = max_change;
754
6973dcae 755 for (i = 0; i < data->nr; i++) {
d2543b8e 756 const char *prefix = "";
6973dcae
JH
757 char *name = data->files[i]->name;
758 int added = data->files[i]->added;
759 int deleted = data->files[i]->deleted;
a2540023 760 int name_len;
6973dcae
JH
761
762 /*
763 * "scale" the filename
764 */
a2540023
JH
765 len = name_width;
766 name_len = strlen(name);
767 if (name_width < name_len) {
6973dcae
JH
768 char *slash;
769 prefix = "...";
a2540023
JH
770 len -= 3;
771 name += name_len - len;
6973dcae
JH
772 slash = strchr(name, '/');
773 if (slash)
774 name = slash;
775 }
6973dcae
JH
776
777 if (data->files[i]->is_binary) {
785f7432 778 show_name(prefix, name, len, reset, set);
a2540023 779 printf(" Bin\n");
6973dcae
JH
780 goto free_diffstat_file;
781 }
782 else if (data->files[i]->is_unmerged) {
785f7432 783 show_name(prefix, name, len, reset, set);
a2540023 784 printf(" Unmerged\n");
6973dcae
JH
785 goto free_diffstat_file;
786 }
787 else if (!data->files[i]->is_renamed &&
788 (added + deleted == 0)) {
789 total_files--;
790 goto free_diffstat_file;
791 }
792
a2540023
JH
793 /*
794 * scale the add/delete
795 */
6973dcae
JH
796 add = added;
797 del = deleted;
798 total = add + del;
799 adds += add;
800 dels += del;
801
a2540023 802 if (width <= max_change) {
a2540023 803 add = scale_linear(add, width, max_change);
3ed74e60
JS
804 del = scale_linear(del, width, max_change);
805 total = add + del;
6973dcae 806 }
785f7432 807 show_name(prefix, name, len, reset, set);
a2540023 808 printf("%5d ", added + deleted);
785f7432
JH
809 show_graph('+', add, add_c, reset);
810 show_graph('-', del, del_c, reset);
a2540023 811 putchar('\n');
6973dcae
JH
812 free_diffstat_file:
813 free(data->files[i]->name);
814 free(data->files[i]);
815 }
816 free(data->files);
785f7432
JH
817 printf("%s %d files changed, %d insertions(+), %d deletions(-)%s\n",
818 set, total_files, adds, dels, reset);
6973dcae
JH
819}
820
ebd124c6
NP
821static void show_shortstats(struct diffstat_t* data)
822{
823 int i, adds = 0, dels = 0, total_files = data->nr;
824
825 if (data->nr == 0)
826 return;
827
828 for (i = 0; i < data->nr; i++) {
829 if (!data->files[i]->is_binary &&
830 !data->files[i]->is_unmerged) {
831 int added = data->files[i]->added;
832 int deleted= data->files[i]->deleted;
833 if (!data->files[i]->is_renamed &&
834 (added + deleted == 0)) {
835 total_files--;
836 } else {
837 adds += added;
838 dels += deleted;
839 }
840 }
841 free(data->files[i]->name);
842 free(data->files[i]);
843 }
844 free(data->files);
845
846 printf(" %d files changed, %d insertions(+), %d deletions(-)\n",
847 total_files, adds, dels);
848}
849
74e2abe5
JH
850static void show_numstat(struct diffstat_t* data, struct diff_options *options)
851{
852 int i;
853
854 for (i = 0; i < data->nr; i++) {
855 struct diffstat_file *file = data->files[i];
856
bfddbc5e
JH
857 if (file->is_binary)
858 printf("-\t-\t");
859 else
860 printf("%d\t%d\t", file->added, file->deleted);
e5bfbf9b 861 if (options->line_termination && !file->is_renamed &&
74e2abe5
JH
862 quote_c_style(file->name, NULL, NULL, 0))
863 quote_c_style(file->name, NULL, stdout, 0);
864 else
865 fputs(file->name, stdout);
866 putchar(options->line_termination);
867 }
868}
869
88246898
JS
870struct checkdiff_t {
871 struct xdiff_emit_state xm;
872 const char *filename;
873 int lineno;
874};
875
876static void checkdiff_consume(void *priv, char *line, unsigned long len)
877{
878 struct checkdiff_t *data = priv;
879
880 if (line[0] == '+') {
881 int i, spaces = 0;
882
88246898
JS
883 /* check space before tab */
884 for (i = 1; i < len && (line[i] == ' ' || line[i] == '\t'); i++)
885 if (line[i] == ' ')
886 spaces++;
887 if (line[i - 1] == '\t' && spaces)
888 printf("%s:%d: space before tab:%.*s\n",
889 data->filename, data->lineno, (int)len, line);
890
891 /* check white space at line end */
892 if (line[len - 1] == '\n')
893 len--;
894 if (isspace(line[len - 1]))
895 printf("%s:%d: white space at end: %.*s\n",
896 data->filename, data->lineno, (int)len, line);
e6d40d65
JS
897
898 data->lineno++;
88246898
JS
899 } else if (line[0] == ' ')
900 data->lineno++;
901 else if (line[0] == '@') {
902 char *plus = strchr(line, '+');
903 if (plus)
9e848163 904 data->lineno = strtol(plus, NULL, 10);
88246898
JS
905 else
906 die("invalid diff");
907 }
908}
909
0660626c
JH
910static unsigned char *deflate_it(char *data,
911 unsigned long size,
912 unsigned long *result_size)
051308f6 913{
0660626c
JH
914 int bound;
915 unsigned char *deflated;
916 z_stream stream;
917
918 memset(&stream, 0, sizeof(stream));
12f6c308 919 deflateInit(&stream, zlib_compression_level);
0660626c
JH
920 bound = deflateBound(&stream, size);
921 deflated = xmalloc(bound);
922 stream.next_out = deflated;
923 stream.avail_out = bound;
924
925 stream.next_in = (unsigned char *)data;
926 stream.avail_in = size;
927 while (deflate(&stream, Z_FINISH) == Z_OK)
928 ; /* nothing */
929 deflateEnd(&stream);
930 *result_size = stream.total_out;
931 return deflated;
051308f6
JH
932}
933
d4c452f0 934static void emit_binary_diff_body(mmfile_t *one, mmfile_t *two)
051308f6 935{
0660626c
JH
936 void *cp;
937 void *delta;
938 void *deflated;
939 void *data;
940 unsigned long orig_size;
941 unsigned long delta_size;
942 unsigned long deflate_size;
943 unsigned long data_size;
051308f6 944
0660626c
JH
945 /* We could do deflated delta, or we could do just deflated two,
946 * whichever is smaller.
051308f6 947 */
0660626c
JH
948 delta = NULL;
949 deflated = deflate_it(two->ptr, two->size, &deflate_size);
950 if (one->size && two->size) {
951 delta = diff_delta(one->ptr, one->size,
952 two->ptr, two->size,
953 &delta_size, deflate_size);
954 if (delta) {
955 void *to_free = delta;
956 orig_size = delta_size;
957 delta = deflate_it(delta, delta_size, &delta_size);
958 free(to_free);
051308f6
JH
959 }
960 }
051308f6 961
0660626c
JH
962 if (delta && delta_size < deflate_size) {
963 printf("delta %lu\n", orig_size);
964 free(deflated);
965 data = delta;
966 data_size = delta_size;
967 }
968 else {
969 printf("literal %lu\n", two->size);
970 free(delta);
971 data = deflated;
972 data_size = deflate_size;
973 }
051308f6 974
0660626c
JH
975 /* emit data encoded in base85 */
976 cp = data;
977 while (data_size) {
978 int bytes = (52 < data_size) ? 52 : data_size;
051308f6 979 char line[70];
0660626c 980 data_size -= bytes;
051308f6
JH
981 if (bytes <= 26)
982 line[0] = bytes + 'A' - 1;
983 else
984 line[0] = bytes - 26 + 'a' - 1;
985 encode_85(line + 1, cp, bytes);
1d7f171c 986 cp = (char *) cp + bytes;
051308f6
JH
987 puts(line);
988 }
989 printf("\n");
0660626c 990 free(data);
051308f6
JH
991}
992
d4c452f0
JH
993static void emit_binary_diff(mmfile_t *one, mmfile_t *two)
994{
995 printf("GIT binary patch\n");
996 emit_binary_diff_body(one, two);
997 emit_binary_diff_body(two, one);
998}
999
6973dcae
JH
1000#define FIRST_FEW_BYTES 8000
1001static int mmfile_is_binary(mmfile_t *mf)
1002{
1003 long sz = mf->size;
1004 if (FIRST_FEW_BYTES < sz)
1005 sz = FIRST_FEW_BYTES;
8c0b2bb6 1006 return !!memchr(mf->ptr, 0, sz);
6973dcae
JH
1007}
1008
1009static void builtin_diff(const char *name_a,
1010 const char *name_b,
1011 struct diff_filespec *one,
1012 struct diff_filespec *two,
1013 const char *xfrm_msg,
051308f6 1014 struct diff_options *o,
6973dcae
JH
1015 int complete_rewrite)
1016{
1017 mmfile_t mf1, mf2;
1018 const char *lbl[2];
1019 char *a_one, *b_two;
ce436973
JK
1020 const char *set = diff_get_color(o->color_diff, DIFF_METAINFO);
1021 const char *reset = diff_get_color(o->color_diff, DIFF_RESET);
6973dcae
JH
1022
1023 a_one = quote_two("a/", name_a);
1024 b_two = quote_two("b/", name_b);
1025 lbl[0] = DIFF_FILE_VALID(one) ? a_one : "/dev/null";
1026 lbl[1] = DIFF_FILE_VALID(two) ? b_two : "/dev/null";
50f575fc 1027 printf("%sdiff --git %s %s%s\n", set, a_one, b_two, reset);
6973dcae
JH
1028 if (lbl[0][0] == '/') {
1029 /* /dev/null */
50f575fc
LT
1030 printf("%snew file mode %06o%s\n", set, two->mode, reset);
1031 if (xfrm_msg && xfrm_msg[0])
1032 printf("%s%s%s\n", set, xfrm_msg, reset);
6973dcae
JH
1033 }
1034 else if (lbl[1][0] == '/') {
50f575fc
LT
1035 printf("%sdeleted file mode %06o%s\n", set, one->mode, reset);
1036 if (xfrm_msg && xfrm_msg[0])
1037 printf("%s%s%s\n", set, xfrm_msg, reset);
6973dcae
JH
1038 }
1039 else {
1040 if (one->mode != two->mode) {
50f575fc
LT
1041 printf("%sold mode %06o%s\n", set, one->mode, reset);
1042 printf("%snew mode %06o%s\n", set, two->mode, reset);
cd112cef 1043 }
50f575fc
LT
1044 if (xfrm_msg && xfrm_msg[0])
1045 printf("%s%s%s\n", set, xfrm_msg, reset);
6973dcae
JH
1046 /*
1047 * we do not run diff between different kind
1048 * of objects.
1049 */
1050 if ((one->mode ^ two->mode) & S_IFMT)
1051 goto free_ab_and_return;
1052 if (complete_rewrite) {
1053 emit_rewrite_diff(name_a, name_b, one, two);
1054 goto free_ab_and_return;
1055 }
1056 }
1057
1058 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1059 die("unable to read files to diff");
1060
6d64ea96 1061 if (!o->text && (mmfile_is_binary(&mf1) || mmfile_is_binary(&mf2))) {
0660626c
JH
1062 /* Quite common confusing case */
1063 if (mf1.size == mf2.size &&
1064 !memcmp(mf1.ptr, mf2.ptr, mf1.size))
1065 goto free_ab_and_return;
1066 if (o->binary)
051308f6
JH
1067 emit_binary_diff(&mf1, &mf2);
1068 else
1069 printf("Binary files %s and %s differ\n",
1070 lbl[0], lbl[1]);
1071 }
6973dcae
JH
1072 else {
1073 /* Crazy xdl interfaces.. */
1074 const char *diffopts = getenv("GIT_DIFF_OPTS");
1075 xpparam_t xpp;
1076 xdemitconf_t xecfg;
1077 xdemitcb_t ecb;
1078 struct emit_callback ecbdata;
1079
cd112cef 1080 memset(&ecbdata, 0, sizeof(ecbdata));
6973dcae 1081 ecbdata.label_path = lbl;
cd112cef 1082 ecbdata.color_diff = o->color_diff;
0d21efa5 1083 xpp.flags = XDF_NEED_MINIMAL | o->xdl_opts;
ee1e5412 1084 xecfg.ctxlen = o->context;
6973dcae
JH
1085 xecfg.flags = XDL_EMIT_FUNCNAMES;
1086 if (!diffopts)
1087 ;
1088 else if (!strncmp(diffopts, "--unified=", 10))
1089 xecfg.ctxlen = strtoul(diffopts + 10, NULL, 10);
1090 else if (!strncmp(diffopts, "-u", 2))
1091 xecfg.ctxlen = strtoul(diffopts + 2, NULL, 10);
cd112cef 1092 ecb.outf = xdiff_outf;
6973dcae 1093 ecb.priv = &ecbdata;
cd112cef 1094 ecbdata.xm.consume = fn_out_consume;
f59a59e2
JS
1095 if (o->color_diff_words)
1096 ecbdata.diff_words =
1097 xcalloc(1, sizeof(struct diff_words_data));
6973dcae 1098 xdl_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
f59a59e2
JS
1099 if (o->color_diff_words)
1100 free_diff_words_data(&ecbdata);
6973dcae
JH
1101 }
1102
1103 free_ab_and_return:
1104 free(a_one);
1105 free(b_two);
1106 return;
1107}
1108
1109static void builtin_diffstat(const char *name_a, const char *name_b,
1110 struct diff_filespec *one,
1111 struct diff_filespec *two,
710158e3 1112 struct diffstat_t *diffstat,
0d21efa5 1113 struct diff_options *o,
710158e3 1114 int complete_rewrite)
6973dcae
JH
1115{
1116 mmfile_t mf1, mf2;
1117 struct diffstat_file *data;
1118
1119 data = diffstat_add(diffstat, name_a, name_b);
1120
1121 if (!one || !two) {
1122 data->is_unmerged = 1;
1123 return;
1124 }
710158e3
JH
1125 if (complete_rewrite) {
1126 diff_populate_filespec(one, 0);
1127 diff_populate_filespec(two, 0);
1128 data->deleted = count_lines(one->data, one->size);
1129 data->added = count_lines(two->data, two->size);
1130 return;
1131 }
6973dcae
JH
1132 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1133 die("unable to read files to diff");
1134
1135 if (mmfile_is_binary(&mf1) || mmfile_is_binary(&mf2))
1136 data->is_binary = 1;
1137 else {
1138 /* Crazy xdl interfaces.. */
1139 xpparam_t xpp;
1140 xdemitconf_t xecfg;
1141 xdemitcb_t ecb;
1142
0d21efa5 1143 xpp.flags = XDF_NEED_MINIMAL | o->xdl_opts;
6973dcae
JH
1144 xecfg.ctxlen = 0;
1145 xecfg.flags = 0;
1146 ecb.outf = xdiff_outf;
1147 ecb.priv = diffstat;
1148 xdl_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
1149 }
1150}
1151
88246898
JS
1152static void builtin_checkdiff(const char *name_a, const char *name_b,
1153 struct diff_filespec *one,
1154 struct diff_filespec *two)
1155{
1156 mmfile_t mf1, mf2;
1157 struct checkdiff_t data;
1158
1159 if (!two)
1160 return;
1161
1162 memset(&data, 0, sizeof(data));
1163 data.xm.consume = checkdiff_consume;
1164 data.filename = name_b ? name_b : name_a;
1165 data.lineno = 0;
1166
1167 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1168 die("unable to read files to diff");
1169
1170 if (mmfile_is_binary(&mf2))
1171 return;
1172 else {
1173 /* Crazy xdl interfaces.. */
1174 xpparam_t xpp;
1175 xdemitconf_t xecfg;
1176 xdemitcb_t ecb;
1177
1178 xpp.flags = XDF_NEED_MINIMAL;
1179 xecfg.ctxlen = 0;
1180 xecfg.flags = 0;
1181 ecb.outf = xdiff_outf;
1182 ecb.priv = &data;
1183 xdl_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
1184 }
1185}
1186
6973dcae
JH
1187struct diff_filespec *alloc_filespec(const char *path)
1188{
1189 int namelen = strlen(path);
1190 struct diff_filespec *spec = xmalloc(sizeof(*spec) + namelen + 1);
1191
1192 memset(spec, 0, sizeof(*spec));
1193 spec->path = (char *)(spec + 1);
1194 memcpy(spec->path, path, namelen+1);
1195 return spec;
1196}
1197
1198void fill_filespec(struct diff_filespec *spec, const unsigned char *sha1,
1199 unsigned short mode)
1200{
1201 if (mode) {
1202 spec->mode = canon_mode(mode);
e702496e 1203 hashcpy(spec->sha1, sha1);
0bef57ee 1204 spec->sha1_valid = !is_null_sha1(sha1);
6973dcae
JH
1205 }
1206}
1207
1208/*
1209 * Given a name and sha1 pair, if the dircache tells us the file in
1210 * the work tree has that object contents, return true, so that
1211 * prepare_temp_file() does not have to inflate and extract.
1212 */
1510fea7 1213static int reuse_worktree_file(const char *name, const unsigned char *sha1, int want_file)
6973dcae
JH
1214{
1215 struct cache_entry *ce;
1216 struct stat st;
1217 int pos, len;
1218
1219 /* We do not read the cache ourselves here, because the
1220 * benchmark with my previous version that always reads cache
1221 * shows that it makes things worse for diff-tree comparing
1222 * two linux-2.6 kernel trees in an already checked out work
1223 * tree. This is because most diff-tree comparisons deal with
1224 * only a small number of files, while reading the cache is
1225 * expensive for a large project, and its cost outweighs the
1226 * savings we get by not inflating the object to a temporary
1227 * file. Practically, this code only helps when we are used
1228 * by diff-cache --cached, which does read the cache before
1229 * calling us.
1230 */
1231 if (!active_cache)
1232 return 0;
1233
1510fea7
SP
1234 /* We want to avoid the working directory if our caller
1235 * doesn't need the data in a normal file, this system
1236 * is rather slow with its stat/open/mmap/close syscalls,
1237 * and the object is contained in a pack file. The pack
1238 * is probably already open and will be faster to obtain
1239 * the data through than the working directory. Loose
1240 * objects however would tend to be slower as they need
1241 * to be individually opened and inflated.
1242 */
5caf9232 1243 if (!FAST_WORKING_DIRECTORY && !want_file && has_sha1_pack(sha1, NULL))
1510fea7
SP
1244 return 0;
1245
6973dcae
JH
1246 len = strlen(name);
1247 pos = cache_name_pos(name, len);
1248 if (pos < 0)
1249 return 0;
1250 ce = active_cache[pos];
1251 if ((lstat(name, &st) < 0) ||
1252 !S_ISREG(st.st_mode) || /* careful! */
1253 ce_match_stat(ce, &st, 0) ||
a89fccd2 1254 hashcmp(sha1, ce->sha1))
6973dcae
JH
1255 return 0;
1256 /* we return 1 only when we can stat, it is a regular file,
1257 * stat information matches, and sha1 recorded in the cache
1258 * matches. I.e. we know the file in the work tree really is
1259 * the same as the <name, sha1> pair.
1260 */
1261 return 1;
1262}
1263
1264static struct sha1_size_cache {
1265 unsigned char sha1[20];
1266 unsigned long size;
1267} **sha1_size_cache;
1268static int sha1_size_cache_nr, sha1_size_cache_alloc;
1269
1270static struct sha1_size_cache *locate_size_cache(unsigned char *sha1,
1271 int find_only,
1272 unsigned long size)
1273{
1274 int first, last;
1275 struct sha1_size_cache *e;
1276
1277 first = 0;
1278 last = sha1_size_cache_nr;
1279 while (last > first) {
1280 int cmp, next = (last + first) >> 1;
1281 e = sha1_size_cache[next];
a89fccd2 1282 cmp = hashcmp(e->sha1, sha1);
6973dcae
JH
1283 if (!cmp)
1284 return e;
1285 if (cmp < 0) {
1286 last = next;
1287 continue;
1288 }
1289 first = next+1;
1290 }
1291 /* not found */
1292 if (find_only)
1293 return NULL;
1294 /* insert to make it at "first" */
1295 if (sha1_size_cache_alloc <= sha1_size_cache_nr) {
1296 sha1_size_cache_alloc = alloc_nr(sha1_size_cache_alloc);
1297 sha1_size_cache = xrealloc(sha1_size_cache,
1298 sha1_size_cache_alloc *
1299 sizeof(*sha1_size_cache));
1300 }
1301 sha1_size_cache_nr++;
1302 if (first < sha1_size_cache_nr)
1303 memmove(sha1_size_cache + first + 1, sha1_size_cache + first,
1304 (sha1_size_cache_nr - first - 1) *
1305 sizeof(*sha1_size_cache));
1306 e = xmalloc(sizeof(struct sha1_size_cache));
1307 sha1_size_cache[first] = e;
e702496e 1308 hashcpy(e->sha1, sha1);
6973dcae
JH
1309 e->size = size;
1310 return e;
1311}
1312
1313/*
1314 * While doing rename detection and pickaxe operation, we may need to
1315 * grab the data for the blob (or file) for our own in-core comparison.
1316 * diff_filespec has data and size fields for this purpose.
1317 */
1318int diff_populate_filespec(struct diff_filespec *s, int size_only)
1319{
1320 int err = 0;
1321 if (!DIFF_FILE_VALID(s))
1322 die("internal error: asking to populate invalid file.");
1323 if (S_ISDIR(s->mode))
1324 return -1;
1325
1326 if (!use_size_cache)
1327 size_only = 0;
1328
1329 if (s->data)
1330 return err;
1331 if (!s->sha1_valid ||
1510fea7 1332 reuse_worktree_file(s->path, s->sha1, 0)) {
6973dcae
JH
1333 struct stat st;
1334 int fd;
1335 if (lstat(s->path, &st) < 0) {
1336 if (errno == ENOENT) {
1337 err_empty:
1338 err = -1;
1339 empty:
d2543b8e 1340 s->data = (char *)"";
6973dcae
JH
1341 s->size = 0;
1342 return err;
1343 }
1344 }
1345 s->size = st.st_size;
1346 if (!s->size)
1347 goto empty;
1348 if (size_only)
1349 return 0;
1350 if (S_ISLNK(st.st_mode)) {
1351 int ret;
1352 s->data = xmalloc(s->size);
1353 s->should_free = 1;
1354 ret = readlink(s->path, s->data, s->size);
1355 if (ret < 0) {
1356 free(s->data);
1357 goto err_empty;
1358 }
1359 return 0;
1360 }
1361 fd = open(s->path, O_RDONLY);
1362 if (fd < 0)
1363 goto err_empty;
c4712e45 1364 s->data = xmmap(NULL, s->size, PROT_READ, MAP_PRIVATE, fd, 0);
6973dcae 1365 close(fd);
6973dcae 1366 s->should_munmap = 1;
bd3a5b5e 1367 /* FIXME! CRLF -> LF conversion goes here, based on "s->path" */
6973dcae
JH
1368 }
1369 else {
1370 char type[20];
1371 struct sha1_size_cache *e;
1372
1373 if (size_only) {
1374 e = locate_size_cache(s->sha1, 1, 0);
1375 if (e) {
1376 s->size = e->size;
1377 return 0;
1378 }
1379 if (!sha1_object_info(s->sha1, type, &s->size))
1380 locate_size_cache(s->sha1, 0, s->size);
1381 }
1382 else {
1383 s->data = read_sha1_file(s->sha1, type, &s->size);
1384 s->should_free = 1;
1385 }
1386 }
1387 return 0;
1388}
1389
1390void diff_free_filespec_data(struct diff_filespec *s)
1391{
1392 if (s->should_free)
1393 free(s->data);
1394 else if (s->should_munmap)
1395 munmap(s->data, s->size);
1396 s->should_free = s->should_munmap = 0;
1397 s->data = NULL;
1398 free(s->cnt_data);
1399 s->cnt_data = NULL;
1400}
1401
1402static void prep_temp_blob(struct diff_tempfile *temp,
1403 void *blob,
1404 unsigned long size,
1405 const unsigned char *sha1,
1406 int mode)
1407{
1408 int fd;
1409
1410 fd = git_mkstemp(temp->tmp_path, TEMPFILE_PATH_LEN, ".diff_XXXXXX");
1411 if (fd < 0)
1412 die("unable to create temp-file");
93822c22 1413 if (write_in_full(fd, blob, size) != size)
6973dcae
JH
1414 die("unable to write temp-file");
1415 close(fd);
1416 temp->name = temp->tmp_path;
1417 strcpy(temp->hex, sha1_to_hex(sha1));
1418 temp->hex[40] = 0;
1419 sprintf(temp->mode, "%06o", mode);
1420}
1421
1422static void prepare_temp_file(const char *name,
1423 struct diff_tempfile *temp,
1424 struct diff_filespec *one)
1425{
1426 if (!DIFF_FILE_VALID(one)) {
1427 not_a_valid_file:
1428 /* A '-' entry produces this for file-2, and
1429 * a '+' entry produces this for file-1.
1430 */
1431 temp->name = "/dev/null";
1432 strcpy(temp->hex, ".");
1433 strcpy(temp->mode, ".");
1434 return;
1435 }
1436
1437 if (!one->sha1_valid ||
1510fea7 1438 reuse_worktree_file(name, one->sha1, 1)) {
6973dcae
JH
1439 struct stat st;
1440 if (lstat(name, &st) < 0) {
1441 if (errno == ENOENT)
1442 goto not_a_valid_file;
1443 die("stat(%s): %s", name, strerror(errno));
1444 }
1445 if (S_ISLNK(st.st_mode)) {
1446 int ret;
1447 char buf[PATH_MAX + 1]; /* ought to be SYMLINK_MAX */
1448 if (sizeof(buf) <= st.st_size)
1449 die("symlink too long: %s", name);
1450 ret = readlink(name, buf, st.st_size);
1451 if (ret < 0)
1452 die("readlink(%s)", name);
1453 prep_temp_blob(temp, buf, st.st_size,
1454 (one->sha1_valid ?
1455 one->sha1 : null_sha1),
1456 (one->sha1_valid ?
1457 one->mode : S_IFLNK));
1458 }
1459 else {
1460 /* we can borrow from the file in the work tree */
1461 temp->name = name;
1462 if (!one->sha1_valid)
1463 strcpy(temp->hex, sha1_to_hex(null_sha1));
1464 else
1465 strcpy(temp->hex, sha1_to_hex(one->sha1));
1466 /* Even though we may sometimes borrow the
1467 * contents from the work tree, we always want
1468 * one->mode. mode is trustworthy even when
1469 * !(one->sha1_valid), as long as
1470 * DIFF_FILE_VALID(one).
1471 */
1472 sprintf(temp->mode, "%06o", one->mode);
1473 }
1474 return;
1475 }
1476 else {
1477 if (diff_populate_filespec(one, 0))
1478 die("cannot read data blob for %s", one->path);
1479 prep_temp_blob(temp, one->data, one->size,
1480 one->sha1, one->mode);
1481 }
1482}
1483
1484static void remove_tempfile(void)
1485{
1486 int i;
1487
1488 for (i = 0; i < 2; i++)
1489 if (diff_temp[i].name == diff_temp[i].tmp_path) {
1490 unlink(diff_temp[i].name);
1491 diff_temp[i].name = NULL;
1492 }
1493}
1494
1495static void remove_tempfile_on_signal(int signo)
1496{
1497 remove_tempfile();
1498 signal(SIGINT, SIG_DFL);
1499 raise(signo);
1500}
1501
1502static int spawn_prog(const char *pgm, const char **arg)
1503{
1504 pid_t pid;
1505 int status;
1506
1507 fflush(NULL);
1508 pid = fork();
1509 if (pid < 0)
1510 die("unable to fork");
1511 if (!pid) {
1512 execvp(pgm, (char *const*) arg);
1513 exit(255);
1514 }
1515
1516 while (waitpid(pid, &status, 0) < 0) {
1517 if (errno == EINTR)
1518 continue;
1519 return -1;
1520 }
1521
1522 /* Earlier we did not check the exit status because
1523 * diff exits non-zero if files are different, and
1524 * we are not interested in knowing that. It was a
1525 * mistake which made it harder to quit a diff-*
1526 * session that uses the git-apply-patch-script as
1527 * the GIT_EXTERNAL_DIFF. A custom GIT_EXTERNAL_DIFF
1528 * should also exit non-zero only when it wants to
1529 * abort the entire diff-* session.
1530 */
1531 if (WIFEXITED(status) && !WEXITSTATUS(status))
1532 return 0;
1533 return -1;
1534}
1535
1536/* An external diff command takes:
1537 *
1538 * diff-cmd name infile1 infile1-sha1 infile1-mode \
1539 * infile2 infile2-sha1 infile2-mode [ rename-to ]
1540 *
1541 */
1542static void run_external_diff(const char *pgm,
1543 const char *name,
1544 const char *other,
1545 struct diff_filespec *one,
1546 struct diff_filespec *two,
1547 const char *xfrm_msg,
1548 int complete_rewrite)
1549{
1550 const char *spawn_arg[10];
1551 struct diff_tempfile *temp = diff_temp;
1552 int retval;
1553 static int atexit_asked = 0;
1554 const char *othername;
1555 const char **arg = &spawn_arg[0];
1556
1557 othername = (other? other : name);
1558 if (one && two) {
1559 prepare_temp_file(name, &temp[0], one);
1560 prepare_temp_file(othername, &temp[1], two);
1561 if (! atexit_asked &&
1562 (temp[0].name == temp[0].tmp_path ||
1563 temp[1].name == temp[1].tmp_path)) {
1564 atexit_asked = 1;
1565 atexit(remove_tempfile);
1566 }
1567 signal(SIGINT, remove_tempfile_on_signal);
1568 }
1569
1570 if (one && two) {
1571 *arg++ = pgm;
1572 *arg++ = name;
1573 *arg++ = temp[0].name;
1574 *arg++ = temp[0].hex;
1575 *arg++ = temp[0].mode;
1576 *arg++ = temp[1].name;
1577 *arg++ = temp[1].hex;
1578 *arg++ = temp[1].mode;
1579 if (other) {
1580 *arg++ = other;
1581 *arg++ = xfrm_msg;
1582 }
1583 } else {
1584 *arg++ = pgm;
1585 *arg++ = name;
1586 }
1587 *arg = NULL;
1588 retval = spawn_prog(pgm, spawn_arg);
1589 remove_tempfile();
1590 if (retval) {
1591 fprintf(stderr, "external diff died, stopping at %s.\n", name);
1592 exit(1);
1593 }
1594}
1595
1596static void run_diff_cmd(const char *pgm,
1597 const char *name,
1598 const char *other,
1599 struct diff_filespec *one,
1600 struct diff_filespec *two,
1601 const char *xfrm_msg,
051308f6 1602 struct diff_options *o,
6973dcae
JH
1603 int complete_rewrite)
1604{
1605 if (pgm) {
1606 run_external_diff(pgm, name, other, one, two, xfrm_msg,
1607 complete_rewrite);
1608 return;
1609 }
1610 if (one && two)
1611 builtin_diff(name, other ? other : name,
051308f6 1612 one, two, xfrm_msg, o, complete_rewrite);
6973dcae
JH
1613 else
1614 printf("* Unmerged path %s\n", name);
1615}
1616
1617static void diff_fill_sha1_info(struct diff_filespec *one)
1618{
1619 if (DIFF_FILE_VALID(one)) {
1620 if (!one->sha1_valid) {
1621 struct stat st;
1622 if (lstat(one->path, &st) < 0)
1623 die("stat %s", one->path);
1624 if (index_path(one->sha1, one->path, &st, 0))
1625 die("cannot hash %s\n", one->path);
1626 }
1627 }
1628 else
e702496e 1629 hashclr(one->sha1);
6973dcae
JH
1630}
1631
1632static void run_diff(struct diff_filepair *p, struct diff_options *o)
1633{
1634 const char *pgm = external_diff();
1635 char msg[PATH_MAX*2+300], *xfrm_msg;
1636 struct diff_filespec *one;
1637 struct diff_filespec *two;
1638 const char *name;
1639 const char *other;
1640 char *name_munged, *other_munged;
1641 int complete_rewrite = 0;
1642 int len;
1643
1644 if (DIFF_PAIR_UNMERGED(p)) {
1645 /* unmerged */
051308f6 1646 run_diff_cmd(pgm, p->one->path, NULL, NULL, NULL, NULL, o, 0);
6973dcae
JH
1647 return;
1648 }
1649
1650 name = p->one->path;
1651 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
1652 name_munged = quote_one(name);
1653 other_munged = quote_one(other);
1654 one = p->one; two = p->two;
1655
1656 diff_fill_sha1_info(one);
1657 diff_fill_sha1_info(two);
1658
1659 len = 0;
1660 switch (p->status) {
1661 case DIFF_STATUS_COPIED:
1662 len += snprintf(msg + len, sizeof(msg) - len,
1663 "similarity index %d%%\n"
1664 "copy from %s\n"
1665 "copy to %s\n",
1666 (int)(0.5 + p->score * 100.0/MAX_SCORE),
1667 name_munged, other_munged);
1668 break;
1669 case DIFF_STATUS_RENAMED:
1670 len += snprintf(msg + len, sizeof(msg) - len,
1671 "similarity index %d%%\n"
1672 "rename from %s\n"
1673 "rename to %s\n",
1674 (int)(0.5 + p->score * 100.0/MAX_SCORE),
1675 name_munged, other_munged);
1676 break;
1677 case DIFF_STATUS_MODIFIED:
1678 if (p->score) {
1679 len += snprintf(msg + len, sizeof(msg) - len,
1680 "dissimilarity index %d%%\n",
1681 (int)(0.5 + p->score *
1682 100.0/MAX_SCORE));
1683 complete_rewrite = 1;
1684 break;
1685 }
1686 /* fallthru */
1687 default:
1688 /* nothing */
1689 ;
1690 }
1691
a89fccd2 1692 if (hashcmp(one->sha1, two->sha1)) {
6973dcae 1693 int abbrev = o->full_index ? 40 : DEFAULT_ABBREV;
6973dcae 1694
82793c55
JH
1695 if (o->binary) {
1696 mmfile_t mf;
1697 if ((!fill_mmfile(&mf, one) && mmfile_is_binary(&mf)) ||
1698 (!fill_mmfile(&mf, two) && mmfile_is_binary(&mf)))
1699 abbrev = 40;
1700 }
6973dcae
JH
1701 len += snprintf(msg + len, sizeof(msg) - len,
1702 "index %.*s..%.*s",
dcb3450f
LT
1703 abbrev, sha1_to_hex(one->sha1),
1704 abbrev, sha1_to_hex(two->sha1));
6973dcae
JH
1705 if (one->mode == two->mode)
1706 len += snprintf(msg + len, sizeof(msg) - len,
1707 " %06o", one->mode);
1708 len += snprintf(msg + len, sizeof(msg) - len, "\n");
1709 }
1710
1711 if (len)
1712 msg[--len] = 0;
1713 xfrm_msg = len ? msg : NULL;
1714
1715 if (!pgm &&
1716 DIFF_FILE_VALID(one) && DIFF_FILE_VALID(two) &&
1717 (S_IFMT & one->mode) != (S_IFMT & two->mode)) {
1718 /* a filepair that changes between file and symlink
1719 * needs to be split into deletion and creation.
1720 */
1721 struct diff_filespec *null = alloc_filespec(two->path);
051308f6 1722 run_diff_cmd(NULL, name, other, one, null, xfrm_msg, o, 0);
6973dcae
JH
1723 free(null);
1724 null = alloc_filespec(one->path);
051308f6 1725 run_diff_cmd(NULL, name, other, null, two, xfrm_msg, o, 0);
6973dcae
JH
1726 free(null);
1727 }
1728 else
051308f6 1729 run_diff_cmd(pgm, name, other, one, two, xfrm_msg, o,
6973dcae
JH
1730 complete_rewrite);
1731
1732 free(name_munged);
1733 free(other_munged);
1734}
1735
1736static void run_diffstat(struct diff_filepair *p, struct diff_options *o,
1737 struct diffstat_t *diffstat)
1738{
1739 const char *name;
1740 const char *other;
710158e3 1741 int complete_rewrite = 0;
6973dcae
JH
1742
1743 if (DIFF_PAIR_UNMERGED(p)) {
1744 /* unmerged */
0d21efa5 1745 builtin_diffstat(p->one->path, NULL, NULL, NULL, diffstat, o, 0);
6973dcae
JH
1746 return;
1747 }
1748
1749 name = p->one->path;
1750 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
1751
1752 diff_fill_sha1_info(p->one);
1753 diff_fill_sha1_info(p->two);
1754
710158e3
JH
1755 if (p->status == DIFF_STATUS_MODIFIED && p->score)
1756 complete_rewrite = 1;
0d21efa5 1757 builtin_diffstat(name, other, p->one, p->two, diffstat, o, complete_rewrite);
6973dcae
JH
1758}
1759
88246898
JS
1760static void run_checkdiff(struct diff_filepair *p, struct diff_options *o)
1761{
1762 const char *name;
1763 const char *other;
1764
1765 if (DIFF_PAIR_UNMERGED(p)) {
1766 /* unmerged */
1767 return;
1768 }
1769
1770 name = p->one->path;
1771 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
1772
1773 diff_fill_sha1_info(p->one);
1774 diff_fill_sha1_info(p->two);
1775
1776 builtin_checkdiff(name, other, p->one, p->two);
1777}
1778
6973dcae
JH
1779void diff_setup(struct diff_options *options)
1780{
1781 memset(options, 0, sizeof(*options));
6973dcae
JH
1782 options->line_termination = '\n';
1783 options->break_opt = -1;
1784 options->rename_limit = -1;
ee1e5412 1785 options->context = 3;
3969cf7d 1786 options->msg_sep = "";
6973dcae
JH
1787
1788 options->change = diff_change;
1789 options->add_remove = diff_addremove;
801235c5 1790 options->color_diff = diff_use_color_default;
b68ea12e 1791 options->detect_rename = diff_detect_rename_default;
6973dcae
JH
1792}
1793
1794int diff_setup_done(struct diff_options *options)
1795{
d7de00f7
TH
1796 int count = 0;
1797
1798 if (options->output_format & DIFF_FORMAT_NAME)
1799 count++;
1800 if (options->output_format & DIFF_FORMAT_NAME_STATUS)
1801 count++;
1802 if (options->output_format & DIFF_FORMAT_CHECKDIFF)
1803 count++;
1804 if (options->output_format & DIFF_FORMAT_NO_OUTPUT)
1805 count++;
1806 if (count > 1)
1807 die("--name-only, --name-status, --check and -s are mutually exclusive");
1808
03b9d560
JH
1809 if (options->find_copies_harder)
1810 options->detect_rename = DIFF_DETECT_COPY;
1811
c6744349
TH
1812 if (options->output_format & (DIFF_FORMAT_NAME |
1813 DIFF_FORMAT_NAME_STATUS |
1814 DIFF_FORMAT_CHECKDIFF |
1815 DIFF_FORMAT_NO_OUTPUT))
1816 options->output_format &= ~(DIFF_FORMAT_RAW |
74e2abe5 1817 DIFF_FORMAT_NUMSTAT |
c6744349 1818 DIFF_FORMAT_DIFFSTAT |
ebd124c6 1819 DIFF_FORMAT_SHORTSTAT |
c6744349
TH
1820 DIFF_FORMAT_SUMMARY |
1821 DIFF_FORMAT_PATCH);
1822
6973dcae
JH
1823 /*
1824 * These cases always need recursive; we do not drop caller-supplied
1825 * recursive bits for other formats here.
1826 */
c6744349 1827 if (options->output_format & (DIFF_FORMAT_PATCH |
74e2abe5 1828 DIFF_FORMAT_NUMSTAT |
c6744349 1829 DIFF_FORMAT_DIFFSTAT |
ebd124c6 1830 DIFF_FORMAT_SHORTSTAT |
d7014dc0 1831 DIFF_FORMAT_SUMMARY |
c6744349 1832 DIFF_FORMAT_CHECKDIFF))
6973dcae 1833 options->recursive = 1;
5e363541 1834 /*
3969cf7d 1835 * Also pickaxe would not work very well if you do not say recursive
5e363541 1836 */
3969cf7d
JH
1837 if (options->pickaxe)
1838 options->recursive = 1;
5e363541 1839
6973dcae
JH
1840 if (options->detect_rename && options->rename_limit < 0)
1841 options->rename_limit = diff_rename_limit_default;
1842 if (options->setup & DIFF_SETUP_USE_CACHE) {
1843 if (!active_cache)
1844 /* read-cache does not die even when it fails
1845 * so it is safe for us to do this here. Also
1846 * it does not smudge active_cache or active_nr
1847 * when it fails, so we do not have to worry about
1848 * cleaning it up ourselves either.
1849 */
1850 read_cache();
1851 }
1852 if (options->setup & DIFF_SETUP_USE_SIZE_CACHE)
1853 use_size_cache = 1;
1854 if (options->abbrev <= 0 || 40 < options->abbrev)
1855 options->abbrev = 40; /* full */
1856
1857 return 0;
1858}
1859
d2543b8e 1860static int opt_arg(const char *arg, int arg_short, const char *arg_long, int *val)
ee1e5412
LT
1861{
1862 char c, *eq;
1863 int len;
1864
1865 if (*arg != '-')
1866 return 0;
1867 c = *++arg;
1868 if (!c)
1869 return 0;
1870 if (c == arg_short) {
1871 c = *++arg;
1872 if (!c)
1873 return 1;
1874 if (val && isdigit(c)) {
1875 char *end;
1876 int n = strtoul(arg, &end, 10);
1877 if (*end)
1878 return 0;
1879 *val = n;
1880 return 1;
1881 }
1882 return 0;
1883 }
1884 if (c != '-')
1885 return 0;
1886 arg++;
1887 eq = strchr(arg, '=');
1888 if (eq)
1889 len = eq - arg;
1890 else
1891 len = strlen(arg);
1892 if (!len || strncmp(arg, arg_long, len))
1893 return 0;
1894 if (eq) {
1895 int n;
1896 char *end;
1897 if (!isdigit(*++eq))
1898 return 0;
1899 n = strtoul(eq, &end, 10);
1900 if (*end)
1901 return 0;
1902 *val = n;
1903 }
1904 return 1;
1905}
1906
6973dcae
JH
1907int diff_opt_parse(struct diff_options *options, const char **av, int ac)
1908{
1909 const char *arg = av[0];
1910 if (!strcmp(arg, "-p") || !strcmp(arg, "-u"))
c6744349 1911 options->output_format |= DIFF_FORMAT_PATCH;
ee1e5412 1912 else if (opt_arg(arg, 'U', "unified", &options->context))
c6744349 1913 options->output_format |= DIFF_FORMAT_PATCH;
a610786f
TH
1914 else if (!strcmp(arg, "--raw"))
1915 options->output_format |= DIFF_FORMAT_RAW;
6973dcae 1916 else if (!strcmp(arg, "--patch-with-raw")) {
c6744349 1917 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_RAW;
6973dcae 1918 }
74e2abe5
JH
1919 else if (!strcmp(arg, "--numstat")) {
1920 options->output_format |= DIFF_FORMAT_NUMSTAT;
1921 }
ebd124c6
NP
1922 else if (!strcmp(arg, "--shortstat")) {
1923 options->output_format |= DIFF_FORMAT_SHORTSTAT;
1924 }
5c5b2ea9
LT
1925 else if (!strncmp(arg, "--stat", 6)) {
1926 char *end;
1927 int width = options->stat_width;
1928 int name_width = options->stat_name_width;
1929 arg += 6;
1930 end = (char *)arg;
1931
1932 switch (*arg) {
1933 case '-':
1934 if (!strncmp(arg, "-width=", 7))
1935 width = strtoul(arg + 7, &end, 10);
1936 else if (!strncmp(arg, "-name-width=", 12))
1937 name_width = strtoul(arg + 12, &end, 10);
1938 break;
1939 case '=':
1940 width = strtoul(arg+1, &end, 10);
1941 if (*end == ',')
1942 name_width = strtoul(end+1, &end, 10);
1943 }
1944
1945 /* Important! This checks all the error cases! */
1946 if (*end)
1947 return 0;
c6744349 1948 options->output_format |= DIFF_FORMAT_DIFFSTAT;
5c5b2ea9
LT
1949 options->stat_name_width = name_width;
1950 options->stat_width = width;
a2540023 1951 }
88246898 1952 else if (!strcmp(arg, "--check"))
c6744349 1953 options->output_format |= DIFF_FORMAT_CHECKDIFF;
4bbd261b 1954 else if (!strcmp(arg, "--summary"))
c6744349 1955 options->output_format |= DIFF_FORMAT_SUMMARY;
6973dcae 1956 else if (!strcmp(arg, "--patch-with-stat")) {
c6744349 1957 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_DIFFSTAT;
6973dcae
JH
1958 }
1959 else if (!strcmp(arg, "-z"))
1960 options->line_termination = 0;
1961 else if (!strncmp(arg, "-l", 2))
1962 options->rename_limit = strtoul(arg+2, NULL, 10);
1963 else if (!strcmp(arg, "--full-index"))
1964 options->full_index = 1;
0660626c 1965 else if (!strcmp(arg, "--binary")) {
c6744349 1966 options->output_format |= DIFF_FORMAT_PATCH;
82793c55 1967 options->binary = 1;
0660626c 1968 }
63ac4501 1969 else if (!strcmp(arg, "-a") || !strcmp(arg, "--text")) {
6d64ea96
SF
1970 options->text = 1;
1971 }
6973dcae 1972 else if (!strcmp(arg, "--name-only"))
c6744349 1973 options->output_format |= DIFF_FORMAT_NAME;
6973dcae 1974 else if (!strcmp(arg, "--name-status"))
c6744349 1975 options->output_format |= DIFF_FORMAT_NAME_STATUS;
6973dcae
JH
1976 else if (!strcmp(arg, "-R"))
1977 options->reverse_diff = 1;
1978 else if (!strncmp(arg, "-S", 2))
1979 options->pickaxe = arg + 2;
c6744349
TH
1980 else if (!strcmp(arg, "-s")) {
1981 options->output_format |= DIFF_FORMAT_NO_OUTPUT;
1982 }
6973dcae
JH
1983 else if (!strncmp(arg, "-O", 2))
1984 options->orderfile = arg + 2;
1985 else if (!strncmp(arg, "--diff-filter=", 14))
1986 options->filter = arg + 14;
1987 else if (!strcmp(arg, "--pickaxe-all"))
1988 options->pickaxe_opts = DIFF_PICKAXE_ALL;
1989 else if (!strcmp(arg, "--pickaxe-regex"))
1990 options->pickaxe_opts = DIFF_PICKAXE_REGEX;
1991 else if (!strncmp(arg, "-B", 2)) {
1992 if ((options->break_opt =
1993 diff_scoreopt_parse(arg)) == -1)
1994 return -1;
1995 }
1996 else if (!strncmp(arg, "-M", 2)) {
1997 if ((options->rename_score =
1998 diff_scoreopt_parse(arg)) == -1)
1999 return -1;
2000 options->detect_rename = DIFF_DETECT_RENAME;
2001 }
2002 else if (!strncmp(arg, "-C", 2)) {
2003 if ((options->rename_score =
2004 diff_scoreopt_parse(arg)) == -1)
2005 return -1;
2006 options->detect_rename = DIFF_DETECT_COPY;
2007 }
2008 else if (!strcmp(arg, "--find-copies-harder"))
2009 options->find_copies_harder = 1;
2010 else if (!strcmp(arg, "--abbrev"))
2011 options->abbrev = DEFAULT_ABBREV;
2012 else if (!strncmp(arg, "--abbrev=", 9)) {
2013 options->abbrev = strtoul(arg + 9, NULL, 10);
2014 if (options->abbrev < MINIMUM_ABBREV)
2015 options->abbrev = MINIMUM_ABBREV;
2016 else if (40 < options->abbrev)
2017 options->abbrev = 40;
2018 }
cd112cef
JS
2019 else if (!strcmp(arg, "--color"))
2020 options->color_diff = 1;
fef88bb0
JH
2021 else if (!strcmp(arg, "--no-color"))
2022 options->color_diff = 0;
0d21efa5
JS
2023 else if (!strcmp(arg, "-w") || !strcmp(arg, "--ignore-all-space"))
2024 options->xdl_opts |= XDF_IGNORE_WHITESPACE;
2025 else if (!strcmp(arg, "-b") || !strcmp(arg, "--ignore-space-change"))
2026 options->xdl_opts |= XDF_IGNORE_WHITESPACE_CHANGE;
f59a59e2
JS
2027 else if (!strcmp(arg, "--color-words"))
2028 options->color_diff = options->color_diff_words = 1;
b68ea12e
EW
2029 else if (!strcmp(arg, "--no-renames"))
2030 options->detect_rename = 0;
6973dcae
JH
2031 else
2032 return 0;
2033 return 1;
2034}
2035
2036static int parse_num(const char **cp_p)
2037{
2038 unsigned long num, scale;
2039 int ch, dot;
2040 const char *cp = *cp_p;
2041
2042 num = 0;
2043 scale = 1;
2044 dot = 0;
2045 for(;;) {
2046 ch = *cp;
2047 if ( !dot && ch == '.' ) {
2048 scale = 1;
2049 dot = 1;
2050 } else if ( ch == '%' ) {
2051 scale = dot ? scale*100 : 100;
2052 cp++; /* % is always at the end */
2053 break;
2054 } else if ( ch >= '0' && ch <= '9' ) {
2055 if ( scale < 100000 ) {
2056 scale *= 10;
2057 num = (num*10) + (ch-'0');
2058 }
2059 } else {
2060 break;
2061 }
2062 cp++;
2063 }
2064 *cp_p = cp;
2065
2066 /* user says num divided by scale and we say internally that
2067 * is MAX_SCORE * num / scale.
2068 */
2069 return (num >= scale) ? MAX_SCORE : (MAX_SCORE * num / scale);
2070}
2071
2072int diff_scoreopt_parse(const char *opt)
2073{
2074 int opt1, opt2, cmd;
2075
2076 if (*opt++ != '-')
2077 return -1;
2078 cmd = *opt++;
2079 if (cmd != 'M' && cmd != 'C' && cmd != 'B')
2080 return -1; /* that is not a -M, -C nor -B option */
2081
2082 opt1 = parse_num(&opt);
2083 if (cmd != 'B')
2084 opt2 = 0;
2085 else {
2086 if (*opt == 0)
2087 opt2 = 0;
2088 else if (*opt != '/')
2089 return -1; /* we expect -B80/99 or -B80 */
2090 else {
2091 opt++;
2092 opt2 = parse_num(&opt);
2093 }
2094 }
2095 if (*opt != 0)
2096 return -1;
2097 return opt1 | (opt2 << 16);
2098}
2099
2100struct diff_queue_struct diff_queued_diff;
2101
2102void diff_q(struct diff_queue_struct *queue, struct diff_filepair *dp)
2103{
2104 if (queue->alloc <= queue->nr) {
2105 queue->alloc = alloc_nr(queue->alloc);
2106 queue->queue = xrealloc(queue->queue,
2107 sizeof(dp) * queue->alloc);
2108 }
2109 queue->queue[queue->nr++] = dp;
2110}
2111
2112struct diff_filepair *diff_queue(struct diff_queue_struct *queue,
2113 struct diff_filespec *one,
2114 struct diff_filespec *two)
2115{
ef677686 2116 struct diff_filepair *dp = xcalloc(1, sizeof(*dp));
6973dcae
JH
2117 dp->one = one;
2118 dp->two = two;
6973dcae
JH
2119 if (queue)
2120 diff_q(queue, dp);
2121 return dp;
2122}
2123
2124void diff_free_filepair(struct diff_filepair *p)
2125{
2126 diff_free_filespec_data(p->one);
2127 diff_free_filespec_data(p->two);
2128 free(p->one);
2129 free(p->two);
2130 free(p);
2131}
2132
2133/* This is different from find_unique_abbrev() in that
2134 * it stuffs the result with dots for alignment.
2135 */
2136const char *diff_unique_abbrev(const unsigned char *sha1, int len)
2137{
2138 int abblen;
2139 const char *abbrev;
2140 if (len == 40)
2141 return sha1_to_hex(sha1);
2142
2143 abbrev = find_unique_abbrev(sha1, len);
2144 if (!abbrev)
2145 return sha1_to_hex(sha1);
2146 abblen = strlen(abbrev);
2147 if (abblen < 37) {
2148 static char hex[41];
2149 if (len < abblen && abblen <= len + 2)
2150 sprintf(hex, "%s%.*s", abbrev, len+3-abblen, "..");
2151 else
2152 sprintf(hex, "%s...", abbrev);
2153 return hex;
2154 }
2155 return sha1_to_hex(sha1);
2156}
2157
2158static void diff_flush_raw(struct diff_filepair *p,
c6744349 2159 struct diff_options *options)
6973dcae
JH
2160{
2161 int two_paths;
2162 char status[10];
2163 int abbrev = options->abbrev;
2164 const char *path_one, *path_two;
c6744349
TH
2165 int inter_name_termination = '\t';
2166 int line_termination = options->line_termination;
2167
2168 if (!line_termination)
2169 inter_name_termination = 0;
6973dcae
JH
2170
2171 path_one = p->one->path;
2172 path_two = p->two->path;
2173 if (line_termination) {
2174 path_one = quote_one(path_one);
2175 path_two = quote_one(path_two);
2176 }
2177
2178 if (p->score)
2179 sprintf(status, "%c%03d", p->status,
2180 (int)(0.5 + p->score * 100.0/MAX_SCORE));
2181 else {
2182 status[0] = p->status;
2183 status[1] = 0;
2184 }
2185 switch (p->status) {
2186 case DIFF_STATUS_COPIED:
2187 case DIFF_STATUS_RENAMED:
2188 two_paths = 1;
2189 break;
2190 case DIFF_STATUS_ADDED:
2191 case DIFF_STATUS_DELETED:
2192 two_paths = 0;
2193 break;
2194 default:
2195 two_paths = 0;
2196 break;
2197 }
c6744349 2198 if (!(options->output_format & DIFF_FORMAT_NAME_STATUS)) {
6973dcae
JH
2199 printf(":%06o %06o %s ",
2200 p->one->mode, p->two->mode,
2201 diff_unique_abbrev(p->one->sha1, abbrev));
2202 printf("%s ",
2203 diff_unique_abbrev(p->two->sha1, abbrev));
2204 }
2205 printf("%s%c%s", status, inter_name_termination, path_one);
2206 if (two_paths)
2207 printf("%c%s", inter_name_termination, path_two);
2208 putchar(line_termination);
2209 if (path_one != p->one->path)
2210 free((void*)path_one);
2211 if (path_two != p->two->path)
2212 free((void*)path_two);
2213}
2214
471efb09 2215static void diff_flush_name(struct diff_filepair *p, struct diff_options *opt)
6973dcae
JH
2216{
2217 char *path = p->two->path;
2218
471efb09 2219 if (opt->line_termination)
6973dcae 2220 path = quote_one(p->two->path);
471efb09 2221 printf("%s%c", path, opt->line_termination);
6973dcae
JH
2222 if (p->two->path != path)
2223 free(path);
2224}
2225
2226int diff_unmodified_pair(struct diff_filepair *p)
2227{
2228 /* This function is written stricter than necessary to support
2229 * the currently implemented transformers, but the idea is to
2230 * let transformers to produce diff_filepairs any way they want,
2231 * and filter and clean them up here before producing the output.
2232 */
2233 struct diff_filespec *one, *two;
2234
2235 if (DIFF_PAIR_UNMERGED(p))
2236 return 0; /* unmerged is interesting */
2237
2238 one = p->one;
2239 two = p->two;
2240
2241 /* deletion, addition, mode or type change
2242 * and rename are all interesting.
2243 */
2244 if (DIFF_FILE_VALID(one) != DIFF_FILE_VALID(two) ||
2245 DIFF_PAIR_MODE_CHANGED(p) ||
2246 strcmp(one->path, two->path))
2247 return 0;
2248
2249 /* both are valid and point at the same path. that is, we are
2250 * dealing with a change.
2251 */
2252 if (one->sha1_valid && two->sha1_valid &&
a89fccd2 2253 !hashcmp(one->sha1, two->sha1))
6973dcae
JH
2254 return 1; /* no change */
2255 if (!one->sha1_valid && !two->sha1_valid)
2256 return 1; /* both look at the same file on the filesystem. */
2257 return 0;
2258}
2259
2260static void diff_flush_patch(struct diff_filepair *p, struct diff_options *o)
2261{
2262 if (diff_unmodified_pair(p))
2263 return;
2264
2265 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2266 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2267 return; /* no tree diffs in patch format */
2268
2269 run_diff(p, o);
2270}
2271
2272static void diff_flush_stat(struct diff_filepair *p, struct diff_options *o,
2273 struct diffstat_t *diffstat)
2274{
2275 if (diff_unmodified_pair(p))
2276 return;
2277
2278 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2279 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2280 return; /* no tree diffs in patch format */
2281
2282 run_diffstat(p, o, diffstat);
2283}
2284
88246898
JS
2285static void diff_flush_checkdiff(struct diff_filepair *p,
2286 struct diff_options *o)
2287{
2288 if (diff_unmodified_pair(p))
2289 return;
2290
2291 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2292 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2293 return; /* no tree diffs in patch format */
2294
2295 run_checkdiff(p, o);
2296}
2297
6973dcae
JH
2298int diff_queue_is_empty(void)
2299{
2300 struct diff_queue_struct *q = &diff_queued_diff;
2301 int i;
2302 for (i = 0; i < q->nr; i++)
2303 if (!diff_unmodified_pair(q->queue[i]))
2304 return 0;
2305 return 1;
2306}
2307
2308#if DIFF_DEBUG
2309void diff_debug_filespec(struct diff_filespec *s, int x, const char *one)
2310{
2311 fprintf(stderr, "queue[%d] %s (%s) %s %06o %s\n",
2312 x, one ? one : "",
2313 s->path,
2314 DIFF_FILE_VALID(s) ? "valid" : "invalid",
2315 s->mode,
2316 s->sha1_valid ? sha1_to_hex(s->sha1) : "");
2317 fprintf(stderr, "queue[%d] %s size %lu flags %d\n",
2318 x, one ? one : "",
2319 s->size, s->xfrm_flags);
2320}
2321
2322void diff_debug_filepair(const struct diff_filepair *p, int i)
2323{
2324 diff_debug_filespec(p->one, i, "one");
2325 diff_debug_filespec(p->two, i, "two");
2326 fprintf(stderr, "score %d, status %c stays %d broken %d\n",
2327 p->score, p->status ? p->status : '?',
2328 p->source_stays, p->broken_pair);
2329}
2330
2331void diff_debug_queue(const char *msg, struct diff_queue_struct *q)
2332{
2333 int i;
2334 if (msg)
2335 fprintf(stderr, "%s\n", msg);
2336 fprintf(stderr, "q->nr = %d\n", q->nr);
2337 for (i = 0; i < q->nr; i++) {
2338 struct diff_filepair *p = q->queue[i];
2339 diff_debug_filepair(p, i);
2340 }
2341}
2342#endif
2343
2344static void diff_resolve_rename_copy(void)
2345{
2346 int i, j;
2347 struct diff_filepair *p, *pp;
2348 struct diff_queue_struct *q = &diff_queued_diff;
2349
2350 diff_debug_queue("resolve-rename-copy", q);
2351
2352 for (i = 0; i < q->nr; i++) {
2353 p = q->queue[i];
2354 p->status = 0; /* undecided */
2355 if (DIFF_PAIR_UNMERGED(p))
2356 p->status = DIFF_STATUS_UNMERGED;
2357 else if (!DIFF_FILE_VALID(p->one))
2358 p->status = DIFF_STATUS_ADDED;
2359 else if (!DIFF_FILE_VALID(p->two))
2360 p->status = DIFF_STATUS_DELETED;
2361 else if (DIFF_PAIR_TYPE_CHANGED(p))
2362 p->status = DIFF_STATUS_TYPE_CHANGED;
2363
2364 /* from this point on, we are dealing with a pair
2365 * whose both sides are valid and of the same type, i.e.
2366 * either in-place edit or rename/copy edit.
2367 */
2368 else if (DIFF_PAIR_RENAME(p)) {
2369 if (p->source_stays) {
2370 p->status = DIFF_STATUS_COPIED;
2371 continue;
2372 }
2373 /* See if there is some other filepair that
2374 * copies from the same source as us. If so
2375 * we are a copy. Otherwise we are either a
2376 * copy if the path stays, or a rename if it
2377 * does not, but we already handled "stays" case.
2378 */
2379 for (j = i + 1; j < q->nr; j++) {
2380 pp = q->queue[j];
2381 if (strcmp(pp->one->path, p->one->path))
2382 continue; /* not us */
2383 if (!DIFF_PAIR_RENAME(pp))
2384 continue; /* not a rename/copy */
2385 /* pp is a rename/copy from the same source */
2386 p->status = DIFF_STATUS_COPIED;
2387 break;
2388 }
2389 if (!p->status)
2390 p->status = DIFF_STATUS_RENAMED;
2391 }
a89fccd2 2392 else if (hashcmp(p->one->sha1, p->two->sha1) ||
6973dcae
JH
2393 p->one->mode != p->two->mode)
2394 p->status = DIFF_STATUS_MODIFIED;
2395 else {
2396 /* This is a "no-change" entry and should not
2397 * happen anymore, but prepare for broken callers.
2398 */
2399 error("feeding unmodified %s to diffcore",
2400 p->one->path);
2401 p->status = DIFF_STATUS_UNKNOWN;
2402 }
2403 }
2404 diff_debug_queue("resolve-rename-copy done", q);
2405}
2406
c6744349 2407static int check_pair_status(struct diff_filepair *p)
6973dcae 2408{
6973dcae
JH
2409 switch (p->status) {
2410 case DIFF_STATUS_UNKNOWN:
c6744349 2411 return 0;
6973dcae
JH
2412 case 0:
2413 die("internal error in diff-resolve-rename-copy");
6973dcae 2414 default:
c6744349 2415 return 1;
6973dcae
JH
2416 }
2417}
2418
c6744349
TH
2419static void flush_one_pair(struct diff_filepair *p, struct diff_options *opt)
2420{
2421 int fmt = opt->output_format;
2422
2423 if (fmt & DIFF_FORMAT_CHECKDIFF)
2424 diff_flush_checkdiff(p, opt);
2425 else if (fmt & (DIFF_FORMAT_RAW | DIFF_FORMAT_NAME_STATUS))
2426 diff_flush_raw(p, opt);
2427 else if (fmt & DIFF_FORMAT_NAME)
471efb09 2428 diff_flush_name(p, opt);
c6744349
TH
2429}
2430
4bbd261b
SE
2431static void show_file_mode_name(const char *newdelete, struct diff_filespec *fs)
2432{
0d26a64e 2433 char *name = quote_one(fs->path);
4bbd261b 2434 if (fs->mode)
0d26a64e 2435 printf(" %s mode %06o %s\n", newdelete, fs->mode, name);
4bbd261b 2436 else
0d26a64e
AJ
2437 printf(" %s %s\n", newdelete, name);
2438 free(name);
4bbd261b
SE
2439}
2440
2441
2442static void show_mode_change(struct diff_filepair *p, int show_name)
2443{
2444 if (p->one->mode && p->two->mode && p->one->mode != p->two->mode) {
0d26a64e
AJ
2445 if (show_name) {
2446 char *name = quote_one(p->two->path);
4bbd261b 2447 printf(" mode change %06o => %06o %s\n",
0d26a64e
AJ
2448 p->one->mode, p->two->mode, name);
2449 free(name);
2450 }
4bbd261b
SE
2451 else
2452 printf(" mode change %06o => %06o\n",
2453 p->one->mode, p->two->mode);
2454 }
2455}
2456
2457static void show_rename_copy(const char *renamecopy, struct diff_filepair *p)
2458{
b9f44164 2459 char *names = pprint_rename(p->one->path, p->two->path);
4bbd261b 2460
b9f44164
AJ
2461 printf(" %s %s (%d%%)\n", renamecopy, names,
2462 (int)(0.5 + p->score * 100.0/MAX_SCORE));
2463 free(names);
4bbd261b
SE
2464 show_mode_change(p, 0);
2465}
2466
2467static void diff_summary(struct diff_filepair *p)
2468{
2469 switch(p->status) {
2470 case DIFF_STATUS_DELETED:
2471 show_file_mode_name("delete", p->one);
2472 break;
2473 case DIFF_STATUS_ADDED:
2474 show_file_mode_name("create", p->two);
2475 break;
2476 case DIFF_STATUS_COPIED:
2477 show_rename_copy("copy", p);
2478 break;
2479 case DIFF_STATUS_RENAMED:
2480 show_rename_copy("rename", p);
2481 break;
2482 default:
2483 if (p->score) {
0d26a64e
AJ
2484 char *name = quote_one(p->two->path);
2485 printf(" rewrite %s (%d%%)\n", name,
4bbd261b 2486 (int)(0.5 + p->score * 100.0/MAX_SCORE));
0d26a64e 2487 free(name);
4bbd261b
SE
2488 show_mode_change(p, 0);
2489 } else show_mode_change(p, 1);
2490 break;
2491 }
2492}
2493
fcb3d0ad
JS
2494struct patch_id_t {
2495 struct xdiff_emit_state xm;
2496 SHA_CTX *ctx;
2497 int patchlen;
2498};
2499
2500static int remove_space(char *line, int len)
2501{
2502 int i;
2503 char *dst = line;
2504 unsigned char c;
2505
2506 for (i = 0; i < len; i++)
2507 if (!isspace((c = line[i])))
2508 *dst++ = c;
2509
2510 return dst - line;
2511}
2512
2513static void patch_id_consume(void *priv, char *line, unsigned long len)
2514{
2515 struct patch_id_t *data = priv;
2516 int new_len;
2517
2518 /* Ignore line numbers when computing the SHA1 of the patch */
2519 if (!strncmp(line, "@@ -", 4))
2520 return;
2521
2522 new_len = remove_space(line, len);
2523
2524 SHA1_Update(data->ctx, line, new_len);
2525 data->patchlen += new_len;
2526}
2527
2528/* returns 0 upon success, and writes result into sha1 */
2529static int diff_get_patch_id(struct diff_options *options, unsigned char *sha1)
2530{
2531 struct diff_queue_struct *q = &diff_queued_diff;
2532 int i;
2533 SHA_CTX ctx;
2534 struct patch_id_t data;
2535 char buffer[PATH_MAX * 4 + 20];
2536
2537 SHA1_Init(&ctx);
2538 memset(&data, 0, sizeof(struct patch_id_t));
2539 data.ctx = &ctx;
2540 data.xm.consume = patch_id_consume;
2541
2542 for (i = 0; i < q->nr; i++) {
2543 xpparam_t xpp;
2544 xdemitconf_t xecfg;
2545 xdemitcb_t ecb;
2546 mmfile_t mf1, mf2;
2547 struct diff_filepair *p = q->queue[i];
2548 int len1, len2;
2549
2550 if (p->status == 0)
2551 return error("internal diff status error");
2552 if (p->status == DIFF_STATUS_UNKNOWN)
2553 continue;
2554 if (diff_unmodified_pair(p))
2555 continue;
2556 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2557 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2558 continue;
2559 if (DIFF_PAIR_UNMERGED(p))
2560 continue;
2561
2562 diff_fill_sha1_info(p->one);
2563 diff_fill_sha1_info(p->two);
2564 if (fill_mmfile(&mf1, p->one) < 0 ||
2565 fill_mmfile(&mf2, p->two) < 0)
2566 return error("unable to read files to diff");
2567
2568 /* Maybe hash p->two? into the patch id? */
2569 if (mmfile_is_binary(&mf2))
2570 continue;
2571
2572 len1 = remove_space(p->one->path, strlen(p->one->path));
2573 len2 = remove_space(p->two->path, strlen(p->two->path));
2574 if (p->one->mode == 0)
2575 len1 = snprintf(buffer, sizeof(buffer),
2576 "diff--gita/%.*sb/%.*s"
2577 "newfilemode%06o"
2578 "---/dev/null"
2579 "+++b/%.*s",
2580 len1, p->one->path,
2581 len2, p->two->path,
2582 p->two->mode,
2583 len2, p->two->path);
2584 else if (p->two->mode == 0)
2585 len1 = snprintf(buffer, sizeof(buffer),
2586 "diff--gita/%.*sb/%.*s"
2587 "deletedfilemode%06o"
2588 "---a/%.*s"
2589 "+++/dev/null",
2590 len1, p->one->path,
2591 len2, p->two->path,
2592 p->one->mode,
2593 len1, p->one->path);
2594 else
2595 len1 = snprintf(buffer, sizeof(buffer),
2596 "diff--gita/%.*sb/%.*s"
2597 "---a/%.*s"
2598 "+++b/%.*s",
2599 len1, p->one->path,
2600 len2, p->two->path,
2601 len1, p->one->path,
2602 len2, p->two->path);
2603 SHA1_Update(&ctx, buffer, len1);
2604
2605 xpp.flags = XDF_NEED_MINIMAL;
2606 xecfg.ctxlen = 3;
9fdc3bb5 2607 xecfg.flags = XDL_EMIT_FUNCNAMES;
fcb3d0ad
JS
2608 ecb.outf = xdiff_outf;
2609 ecb.priv = &data;
2610 xdl_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
2611 }
2612
2613 SHA1_Final(sha1, &ctx);
2614 return 0;
2615}
2616
2617int diff_flush_patch_id(struct diff_options *options, unsigned char *sha1)
2618{
2619 struct diff_queue_struct *q = &diff_queued_diff;
2620 int i;
2621 int result = diff_get_patch_id(options, sha1);
2622
2623 for (i = 0; i < q->nr; i++)
2624 diff_free_filepair(q->queue[i]);
2625
2626 free(q->queue);
2627 q->queue = NULL;
2628 q->nr = q->alloc = 0;
2629
2630 return result;
2631}
2632
946c3784 2633static int is_summary_empty(const struct diff_queue_struct *q)
6973dcae 2634{
6973dcae 2635 int i;
6973dcae 2636
946c3784
TH
2637 for (i = 0; i < q->nr; i++) {
2638 const struct diff_filepair *p = q->queue[i];
2639
2640 switch (p->status) {
2641 case DIFF_STATUS_DELETED:
2642 case DIFF_STATUS_ADDED:
2643 case DIFF_STATUS_COPIED:
2644 case DIFF_STATUS_RENAMED:
2645 return 0;
2646 default:
2647 if (p->score)
2648 return 0;
2649 if (p->one->mode && p->two->mode &&
2650 p->one->mode != p->two->mode)
2651 return 0;
2652 break;
2653 }
6973dcae 2654 }
946c3784
TH
2655 return 1;
2656}
2657
6973dcae
JH
2658void diff_flush(struct diff_options *options)
2659{
2660 struct diff_queue_struct *q = &diff_queued_diff;
c6744349 2661 int i, output_format = options->output_format;
946c3784 2662 int separator = 0;
6973dcae 2663
c6744349
TH
2664 /*
2665 * Order: raw, stat, summary, patch
2666 * or: name/name-status/checkdiff (other bits clear)
2667 */
946c3784
TH
2668 if (!q->nr)
2669 goto free_queue;
6973dcae 2670
c6744349
TH
2671 if (output_format & (DIFF_FORMAT_RAW |
2672 DIFF_FORMAT_NAME |
2673 DIFF_FORMAT_NAME_STATUS |
2674 DIFF_FORMAT_CHECKDIFF)) {
6973dcae
JH
2675 for (i = 0; i < q->nr; i++) {
2676 struct diff_filepair *p = q->queue[i];
c6744349
TH
2677 if (check_pair_status(p))
2678 flush_one_pair(p, options);
6973dcae 2679 }
946c3784 2680 separator++;
6973dcae 2681 }
c6744349 2682
ebd124c6 2683 if (output_format & (DIFF_FORMAT_DIFFSTAT|DIFF_FORMAT_SHORTSTAT|DIFF_FORMAT_NUMSTAT)) {
5e2b0636 2684 struct diffstat_t diffstat;
c6744349 2685
5e2b0636
TH
2686 memset(&diffstat, 0, sizeof(struct diffstat_t));
2687 diffstat.xm.consume = diffstat_consume;
6973dcae
JH
2688 for (i = 0; i < q->nr; i++) {
2689 struct diff_filepair *p = q->queue[i];
c6744349 2690 if (check_pair_status(p))
5e2b0636 2691 diff_flush_stat(p, options, &diffstat);
6973dcae 2692 }
74e2abe5
JH
2693 if (output_format & DIFF_FORMAT_NUMSTAT)
2694 show_numstat(&diffstat, options);
2695 if (output_format & DIFF_FORMAT_DIFFSTAT)
2696 show_stats(&diffstat, options);
ebd124c6
NP
2697 else if (output_format & DIFF_FORMAT_SHORTSTAT)
2698 show_shortstats(&diffstat);
3969cf7d 2699 separator++;
6973dcae
JH
2700 }
2701
946c3784 2702 if (output_format & DIFF_FORMAT_SUMMARY && !is_summary_empty(q)) {
c6744349
TH
2703 for (i = 0; i < q->nr; i++)
2704 diff_summary(q->queue[i]);
3969cf7d 2705 separator++;
6973dcae
JH
2706 }
2707
c6744349 2708 if (output_format & DIFF_FORMAT_PATCH) {
946c3784
TH
2709 if (separator) {
2710 if (options->stat_sep) {
2711 /* attach patch instead of inline */
c6744349 2712 fputs(options->stat_sep, stdout);
946c3784 2713 } else {
c6744349 2714 putchar(options->line_termination);
946c3784 2715 }
c6744349
TH
2716 }
2717
2718 for (i = 0; i < q->nr; i++) {
2719 struct diff_filepair *p = q->queue[i];
2720 if (check_pair_status(p))
2721 diff_flush_patch(p, options);
2722 }
4bbd261b
SE
2723 }
2724
04245581
JK
2725 if (output_format & DIFF_FORMAT_CALLBACK)
2726 options->format_callback(q, options, options->format_callback_data);
2727
c6744349
TH
2728 for (i = 0; i < q->nr; i++)
2729 diff_free_filepair(q->queue[i]);
946c3784 2730free_queue:
6973dcae
JH
2731 free(q->queue);
2732 q->queue = NULL;
2733 q->nr = q->alloc = 0;
2734}
2735
2736static void diffcore_apply_filter(const char *filter)
2737{
2738 int i;
2739 struct diff_queue_struct *q = &diff_queued_diff;
2740 struct diff_queue_struct outq;
2741 outq.queue = NULL;
2742 outq.nr = outq.alloc = 0;
2743
2744 if (!filter)
2745 return;
2746
2747 if (strchr(filter, DIFF_STATUS_FILTER_AON)) {
2748 int found;
2749 for (i = found = 0; !found && i < q->nr; i++) {
2750 struct diff_filepair *p = q->queue[i];
2751 if (((p->status == DIFF_STATUS_MODIFIED) &&
2752 ((p->score &&
2753 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
2754 (!p->score &&
2755 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
2756 ((p->status != DIFF_STATUS_MODIFIED) &&
2757 strchr(filter, p->status)))
2758 found++;
2759 }
2760 if (found)
2761 return;
2762
2763 /* otherwise we will clear the whole queue
2764 * by copying the empty outq at the end of this
2765 * function, but first clear the current entries
2766 * in the queue.
2767 */
2768 for (i = 0; i < q->nr; i++)
2769 diff_free_filepair(q->queue[i]);
2770 }
2771 else {
2772 /* Only the matching ones */
2773 for (i = 0; i < q->nr; i++) {
2774 struct diff_filepair *p = q->queue[i];
2775
2776 if (((p->status == DIFF_STATUS_MODIFIED) &&
2777 ((p->score &&
2778 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
2779 (!p->score &&
2780 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
2781 ((p->status != DIFF_STATUS_MODIFIED) &&
2782 strchr(filter, p->status)))
2783 diff_q(&outq, p);
2784 else
2785 diff_free_filepair(p);
2786 }
2787 }
2788 free(q->queue);
2789 *q = outq;
2790}
2791
2792void diffcore_std(struct diff_options *options)
2793{
2794 if (options->break_opt != -1)
2795 diffcore_break(options->break_opt);
2796 if (options->detect_rename)
2797 diffcore_rename(options);
2798 if (options->break_opt != -1)
2799 diffcore_merge_broken();
2800 if (options->pickaxe)
2801 diffcore_pickaxe(options->pickaxe, options->pickaxe_opts);
2802 if (options->orderfile)
2803 diffcore_order(options->orderfile);
2804 diff_resolve_rename_copy();
2805 diffcore_apply_filter(options->filter);
2806}
2807
2808
2809void diffcore_std_no_resolve(struct diff_options *options)
2810{
2811 if (options->pickaxe)
2812 diffcore_pickaxe(options->pickaxe, options->pickaxe_opts);
2813 if (options->orderfile)
2814 diffcore_order(options->orderfile);
2815 diffcore_apply_filter(options->filter);
2816}
2817
2818void diff_addremove(struct diff_options *options,
2819 int addremove, unsigned mode,
2820 const unsigned char *sha1,
2821 const char *base, const char *path)
2822{
2823 char concatpath[PATH_MAX];
2824 struct diff_filespec *one, *two;
2825
2826 /* This may look odd, but it is a preparation for
2827 * feeding "there are unchanged files which should
2828 * not produce diffs, but when you are doing copy
2829 * detection you would need them, so here they are"
2830 * entries to the diff-core. They will be prefixed
2831 * with something like '=' or '*' (I haven't decided
2832 * which but should not make any difference).
2833 * Feeding the same new and old to diff_change()
2834 * also has the same effect.
2835 * Before the final output happens, they are pruned after
2836 * merged into rename/copy pairs as appropriate.
2837 */
2838 if (options->reverse_diff)
2839 addremove = (addremove == '+' ? '-' :
2840 addremove == '-' ? '+' : addremove);
2841
2842 if (!path) path = "";
2843 sprintf(concatpath, "%s%s", base, path);
2844 one = alloc_filespec(concatpath);
2845 two = alloc_filespec(concatpath);
2846
2847 if (addremove != '+')
2848 fill_filespec(one, sha1, mode);
2849 if (addremove != '-')
2850 fill_filespec(two, sha1, mode);
2851
2852 diff_queue(&diff_queued_diff, one, two);
2853}
2854
2855void diff_change(struct diff_options *options,
2856 unsigned old_mode, unsigned new_mode,
2857 const unsigned char *old_sha1,
2858 const unsigned char *new_sha1,
2859 const char *base, const char *path)
2860{
2861 char concatpath[PATH_MAX];
2862 struct diff_filespec *one, *two;
2863
2864 if (options->reverse_diff) {
2865 unsigned tmp;
2866 const unsigned char *tmp_c;
2867 tmp = old_mode; old_mode = new_mode; new_mode = tmp;
2868 tmp_c = old_sha1; old_sha1 = new_sha1; new_sha1 = tmp_c;
2869 }
2870 if (!path) path = "";
2871 sprintf(concatpath, "%s%s", base, path);
2872 one = alloc_filespec(concatpath);
2873 two = alloc_filespec(concatpath);
2874 fill_filespec(one, old_sha1, old_mode);
2875 fill_filespec(two, new_sha1, new_mode);
2876
2877 diff_queue(&diff_queued_diff, one, two);
2878}
2879
2880void diff_unmerge(struct diff_options *options,
e9c84099
JH
2881 const char *path,
2882 unsigned mode, const unsigned char *sha1)
6973dcae
JH
2883{
2884 struct diff_filespec *one, *two;
2885 one = alloc_filespec(path);
2886 two = alloc_filespec(path);
e9c84099
JH
2887 fill_filespec(one, sha1, mode);
2888 diff_queue(&diff_queued_diff, one, two)->is_unmerged = 1;
6973dcae 2889}