2 * Copyright (C) 2005 Junio C Hamano
3 * Copyright (C) 2010 Google Inc.
8 #include "xdiff-interface.h"
11 typedef int (*pickaxe_fn)(struct diff_filepair *p, struct diff_options *o, regex_t *regexp, kwset_t kws);
13 static void pickaxe(struct diff_queue_struct *q, struct diff_options *o,
14 regex_t *regexp, kwset_t kws, pickaxe_fn fn)
17 struct diff_queue_struct outq;
19 DIFF_QUEUE_CLEAR(&outq);
21 if (o->pickaxe_opts & DIFF_PICKAXE_ALL) {
22 /* Showing the whole changeset if needle exists */
23 for (i = 0; i < q->nr; i++) {
24 struct diff_filepair *p = q->queue[i];
25 if (fn(p, o, regexp, kws))
26 return; /* do not munge the queue */
30 * Otherwise we will clear the whole queue by copying
31 * the empty outq at the end of this function, but
32 * first clear the current entries in the queue.
34 for (i = 0; i < q->nr; i++)
35 diff_free_filepair(q->queue[i]);
37 /* Showing only the filepairs that has the needle */
38 for (i = 0; i < q->nr; i++) {
39 struct diff_filepair *p = q->queue[i];
40 if (fn(p, o, regexp, kws))
43 diff_free_filepair(p);
56 static void diffgrep_consume(void *priv, char *line, unsigned long len)
58 struct diffgrep_cb *data = priv;
62 if (line[0] != '+' && line[0] != '-')
66 * NEEDSWORK: we should have a way to terminate the
70 /* Yuck -- line ought to be "const char *"! */
73 data->hit = !regexec(data->regexp, line + 1, 1, ®match, 0);
77 static void fill_one(struct diff_filespec *one,
78 mmfile_t *mf, struct userdiff_driver *textconv)
80 if (DIFF_FILE_VALID(one)) {
81 mf->size = fill_textconv(textconv, one, &mf->ptr);
83 memset(mf, 0, sizeof(*mf));
87 static int diff_grep(struct diff_filepair *p, struct diff_options *o,
88 regex_t *regexp, kwset_t kws)
91 struct userdiff_driver *textconv_one = NULL;
92 struct userdiff_driver *textconv_two = NULL;
96 if (diff_unmodified_pair(p))
99 textconv_one = get_textconv(p->one);
100 textconv_two = get_textconv(p->two);
102 fill_one(p->one, &mf1, textconv_one);
103 fill_one(p->two, &mf2, textconv_two);
107 return 0; /* ignore unmerged */
108 /* created "two" -- does it have what we are looking for? */
109 hit = !regexec(regexp, mf2.ptr, 1, ®match, 0);
110 } else if (!mf2.ptr) {
111 /* removed "one" -- did it have what we are looking for? */
112 hit = !regexec(regexp, mf1.ptr, 1, ®match, 0);
115 * We have both sides; need to run textual diff and see if
116 * the pattern appears on added/deleted lines.
118 struct diffgrep_cb ecbdata;
122 memset(&xpp, 0, sizeof(xpp));
123 memset(&xecfg, 0, sizeof(xecfg));
124 ecbdata.regexp = regexp;
126 xecfg.ctxlen = o->context;
127 xecfg.interhunkctxlen = o->interhunkcontext;
128 xdi_diff_outf(&mf1, &mf2, diffgrep_consume, &ecbdata,
139 static void diffcore_pickaxe_grep(struct diff_options *o)
143 int cflags = REG_EXTENDED | REG_NEWLINE;
145 if (DIFF_OPT_TST(o, PICKAXE_IGNORE_CASE))
148 err = regcomp(®ex, o->pickaxe, cflags);
151 regerror(err, ®ex, errbuf, 1024);
153 die("invalid log-grep regex: %s", errbuf);
156 pickaxe(&diff_queued_diff, o, ®ex, NULL, diff_grep);
162 static unsigned int contains(mmfile_t *mf, struct diff_options *o,
163 regex_t *regexp, kwset_t kws)
177 assert(data[sz] == '\0');
178 while (*data && !regexec(regexp, data, 1, ®match, flags)) {
180 data += regmatch.rm_eo;
181 if (*data && regmatch.rm_so == regmatch.rm_eo)
186 } else { /* Classic exact string match */
188 struct kwsmatch kwsm;
189 size_t offset = kwsexec(kws, data, sz, &kwsm);
194 found = data + offset;
195 sz -= found - data + kwsm.size[0];
196 data = found + kwsm.size[0];
203 static int has_changes(struct diff_filepair *p, struct diff_options *o,
204 regex_t *regexp, kwset_t kws)
206 struct userdiff_driver *textconv_one = NULL;
207 struct userdiff_driver *textconv_two = NULL;
214 textconv_one = get_textconv(p->one);
215 textconv_two = get_textconv(p->two);
218 * If we have an unmodified pair, we know that the count will be the
219 * same and don't even have to load the blobs. Unless textconv is in
220 * play, _and_ we are using two different textconv filters (e.g.,
221 * because a pair is an exact rename with different textconv attributes
222 * for each side, which might generate different content).
224 if (textconv_one == textconv_two && diff_unmodified_pair(p))
227 fill_one(p->one, &mf1, textconv_one);
228 fill_one(p->two, &mf2, textconv_two);
232 ret = 0; /* ignore unmerged */
234 ret = contains(&mf2, o, regexp, kws) != 0;
236 else if (!mf2.ptr) /* removed */
237 ret = contains(&mf1, o, regexp, kws) != 0;
239 ret = contains(&mf1, o, regexp, kws) !=
240 contains(&mf2, o, regexp, kws);
246 diff_free_filespec_data(p->one);
247 diff_free_filespec_data(p->two);
252 static void diffcore_pickaxe_count(struct diff_options *o)
254 const char *needle = o->pickaxe;
255 int opts = o->pickaxe_opts;
256 unsigned long len = strlen(needle);
257 regex_t regex, *regexp = NULL;
260 if (opts & DIFF_PICKAXE_REGEX) {
262 err = regcomp(®ex, needle, REG_EXTENDED | REG_NEWLINE);
264 /* The POSIX.2 people are surely sick */
266 regerror(err, ®ex, errbuf, 1024);
268 die("invalid pickaxe regex: %s", errbuf);
272 kws = kwsalloc(DIFF_OPT_TST(o, PICKAXE_IGNORE_CASE)
273 ? tolower_trans_tbl : NULL);
274 kwsincr(kws, needle, len);
278 pickaxe(&diff_queued_diff, o, regexp, kws, has_changes);
280 if (opts & DIFF_PICKAXE_REGEX)
287 void diffcore_pickaxe(struct diff_options *o)
289 /* Might want to warn when both S and G are on; I don't care... */
290 if (o->pickaxe_opts & DIFF_PICKAXE_KIND_G)
291 diffcore_pickaxe_grep(o);
293 diffcore_pickaxe_count(o);