diffcore-pickaxe.c

   1 /*
   2  * Copyright (C) 2005 Junio C Hamano
   3  * Copyright (C) 2010 Google Inc.
   4  */
   5 #include "cache.h"
   6 #include "diff.h"
   7 #include "diffcore.h"
   8 #include "xdiff-interface.h"
   9 #include "kwset.h"
  10
  11 struct diffgrep_cb {
  12         regex_t *regexp;
  13         int hit;
  14 };
  15
  16 static void diffgrep_consume(void *priv, char *line, unsigned long len)
  17 {
  18         struct diffgrep_cb *data = priv;
  19         regmatch_t regmatch;
  20         int hold;
  21
  22         if (line[0] != '+' && line[0] != '-')
  23                 return;
  24         if (data->hit)
  25                 /*
  26                  * NEEDSWORK: we should have a way to terminate the
  27                  * caller early.
  28                  */
  29                 return;
  30         /* Yuck -- line ought to be "const char *"! */
  31         hold = line[len];
  32         line[len] = '\0';
  33         data->hit = !regexec(data->regexp, line + 1, 1, &regmatch, 0);
  34         line[len] = hold;
  35 }
  36
  37 static void fill_one(struct diff_filespec *one,
  38                      mmfile_t *mf, struct userdiff_driver **textconv)
  39 {
  40         if (DIFF_FILE_VALID(one)) {
  41                 *textconv = get_textconv(one);
  42                 mf->size = fill_textconv(*textconv, one, &mf->ptr);
  43         } else {
  44                 memset(mf, 0, sizeof(*mf));
  45         }
  46 }
  47
  48 static int diff_grep(struct diff_filepair *p, regex_t *regexp, struct diff_options *o)
  49 {
  50         regmatch_t regmatch;
  51         struct userdiff_driver *textconv_one = NULL;
  52         struct userdiff_driver *textconv_two = NULL;
  53         mmfile_t mf1, mf2;
  54         int hit;
  55
  56         if (diff_unmodified_pair(p))
  57                 return 0;
  58
  59         fill_one(p->one, &mf1, &textconv_one);
  60         fill_one(p->two, &mf2, &textconv_two);
  61
  62         if (!mf1.ptr) {
  63                 if (!mf2.ptr)
  64                         return 0; /* ignore unmerged */
  65                 /* created "two" -- does it have what we are looking for? */
  66                 hit = !regexec(regexp, p->two->data, 1, &regmatch, 0);
  67         } else if (!mf2.ptr) {
  68                 /* removed "one" -- did it have what we are looking for? */
  69                 hit = !regexec(regexp, p->one->data, 1, &regmatch, 0);
  70         } else {
  71                 /*
  72                  * We have both sides; need to run textual diff and see if
  73                  * the pattern appears on added/deleted lines.
  74                  */
  75                 struct diffgrep_cb ecbdata;
  76                 xpparam_t xpp;
  77                 xdemitconf_t xecfg;
  78
  79                 memset(&xpp, 0, sizeof(xpp));
  80                 memset(&xecfg, 0, sizeof(xecfg));
  81                 ecbdata.regexp = regexp;
  82                 ecbdata.hit = 0;
  83                 xecfg.ctxlen = o->context;
  84                 xecfg.interhunkctxlen = o->interhunkcontext;
  85                 xdi_diff_outf(&mf1, &mf2, diffgrep_consume, &ecbdata,
  86                               &xpp, &xecfg);
  87                 hit = ecbdata.hit;
  88         }
  89         if (textconv_one)
  90                 free(mf1.ptr);
  91         if (textconv_two)
  92                 free(mf2.ptr);
  93         return hit;
  94 }
  95
  96 static void diffcore_pickaxe_grep(struct diff_options *o)
  97 {
  98         struct diff_queue_struct *q = &diff_queued_diff;
  99         int i, has_changes, err;
 100         regex_t regex;
 101         struct diff_queue_struct outq;
 102         outq.queue = NULL;
 103         outq.nr = outq.alloc = 0;
 104
 105         err = regcomp(&regex, o->pickaxe, REG_EXTENDED | REG_NEWLINE);
 106         if (err) {
 107                 char errbuf[1024];
 108                 regerror(err, &regex, errbuf, 1024);
 109                 regfree(&regex);
 110                 die("invalid log-grep regex: %s", errbuf);
 111         }
 112
 113         if (o->pickaxe_opts & DIFF_PICKAXE_ALL) {
 114                 /* Showing the whole changeset if needle exists */
 115                 for (i = has_changes = 0; !has_changes && i < q->nr; i++) {
 116                         struct diff_filepair *p = q->queue[i];
 117                         if (diff_grep(p, &regex, o))
 118                                 has_changes++;
 119                 }
 120                 if (has_changes)
 121                         return; /* do not munge the queue */
 122
 123                 /*
 124                  * Otherwise we will clear the whole queue by copying
 125                  * the empty outq at the end of this function, but
 126                  * first clear the current entries in the queue.
 127                  */
 128                 for (i = 0; i < q->nr; i++)
 129                         diff_free_filepair(q->queue[i]);
 130         } else {
 131                 /* Showing only the filepairs that has the needle */
 132                 for (i = 0; i < q->nr; i++) {
 133                         struct diff_filepair *p = q->queue[i];
 134                         if (diff_grep(p, &regex, o))
 135                                 diff_q(&outq, p);
 136                         else
 137                                 diff_free_filepair(p);
 138                 }
 139         }
 140
 141         regfree(&regex);
 142
 143         free(q->queue);
 144         *q = outq;
 145         return;
 146 }
 147
 148 static unsigned int contains(struct diff_filespec *one,
 149                              const char *needle, unsigned long len,
 150                              regex_t *regexp, kwset_t kws)
 151 {
 152         unsigned int cnt;
 153         unsigned long sz;
 154         const char *data;
 155         if (diff_populate_filespec(one, 0))
 156                 return 0;
 157         if (!len)
 158                 return 0;
 159
 160         sz = one->size;
 161         data = one->data;
 162         cnt = 0;
 163
 164         if (regexp) {
 165                 regmatch_t regmatch;
 166                 int flags = 0;
 167
 168                 assert(data[sz] == '\0');
 169                 while (*data && !regexec(regexp, data, 1, &regmatch, flags)) {
 170                         flags |= REG_NOTBOL;
 171                         data += regmatch.rm_eo;
 172                         if (*data && regmatch.rm_so == regmatch.rm_eo)
 173                                 data++;
 174                         cnt++;
 175                 }
 176
 177         } else { /* Classic exact string match */
 178                 while (sz) {
 179                         size_t offset = kwsexec(kws, data, sz, NULL);
 180                         const char *found;
 181                         if (offset == -1)
 182                                 break;
 183                         else
 184                                 found = data + offset;
 185                         sz -= found - data + len;
 186                         data = found + len;
 187                         cnt++;
 188                 }
 189         }
 190         diff_free_filespec_data(one);
 191         return cnt;
 192 }
 193
 194 static void diffcore_pickaxe_count(struct diff_options *o)
 195 {
 196         const char *needle = o->pickaxe;
 197         int opts = o->pickaxe_opts;
 198         struct diff_queue_struct *q = &diff_queued_diff;
 199         unsigned long len = strlen(needle);
 200         int i, has_changes;
 201         regex_t regex, *regexp = NULL;
 202         kwset_t kws = NULL;
 203         struct diff_queue_struct outq;
 204         DIFF_QUEUE_CLEAR(&outq);
 205
 206         if (opts & DIFF_PICKAXE_REGEX) {
 207                 int err;
 208                 err = regcomp(&regex, needle, REG_EXTENDED | REG_NEWLINE);
 209                 if (err) {
 210                         /* The POSIX.2 people are surely sick */
 211                         char errbuf[1024];
 212                         regerror(err, &regex, errbuf, 1024);
 213                         regfree(&regex);
 214                         die("invalid pickaxe regex: %s", errbuf);
 215                 }
 216                 regexp = &regex;
 217         } else {
 218                 kws = kwsalloc(NULL);
 219                 kwsincr(kws, needle, len);
 220                 kwsprep(kws);
 221         }
 222
 223         if (opts & DIFF_PICKAXE_ALL) {
 224                 /* Showing the whole changeset if needle exists */
 225                 for (i = has_changes = 0; !has_changes && i < q->nr; i++) {
 226                         struct diff_filepair *p = q->queue[i];
 227                         if (!DIFF_FILE_VALID(p->one)) {
 228                                 if (!DIFF_FILE_VALID(p->two))
 229                                         continue; /* ignore unmerged */
 230                                 /* created */
 231                                 if (contains(p->two, needle, len, regexp, kws))
 232                                         has_changes++;
 233                         }
 234                         else if (!DIFF_FILE_VALID(p->two)) {
 235                                 if (contains(p->one, needle, len, regexp, kws))
 236                                         has_changes++;
 237                         }
 238                         else if (!diff_unmodified_pair(p) &&
 239                                  contains(p->one, needle, len, regexp, kws) !=
 240                                  contains(p->two, needle, len, regexp, kws))
 241                                 has_changes++;
 242                 }
 243                 if (has_changes)
 244                         return; /* not munge the queue */
 245
 246                 /* otherwise we will clear the whole queue
 247                  * by copying the empty outq at the end of this
 248                  * function, but first clear the current entries
 249                  * in the queue.
 250                  */
 251                 for (i = 0; i < q->nr; i++)
 252                         diff_free_filepair(q->queue[i]);
 253         }
 254         else
 255                 /* Showing only the filepairs that has the needle */
 256                 for (i = 0; i < q->nr; i++) {
 257                         struct diff_filepair *p = q->queue[i];
 258                         has_changes = 0;
 259                         if (!DIFF_FILE_VALID(p->one)) {
 260                                 if (!DIFF_FILE_VALID(p->two))
 261                                         ; /* ignore unmerged */
 262                                 /* created */
 263                                 else if (contains(p->two, needle, len, regexp,
 264                                                   kws))
 265                                         has_changes = 1;
 266                         }
 267                         else if (!DIFF_FILE_VALID(p->two)) {
 268                                 if (contains(p->one, needle, len, regexp, kws))
 269                                         has_changes = 1;
 270                         }
 271                         else if (!diff_unmodified_pair(p) &&
 272                                  contains(p->one, needle, len, regexp, kws) !=
 273                                  contains(p->two, needle, len, regexp, kws))
 274                                 has_changes = 1;
 275
 276                         if (has_changes)
 277                                 diff_q(&outq, p);
 278                         else
 279                                 diff_free_filepair(p);
 280                 }
 281
 282         if (opts & DIFF_PICKAXE_REGEX)
 283                 regfree(&regex);
 284         else
 285                 kwsfree(kws);
 286
 287         free(q->queue);
 288         *q = outq;
 289         return;
 290 }
 291
 292 void diffcore_pickaxe(struct diff_options *o)
 293 {
 294         /* Might want to warn when both S and G are on; I don't care... */
 295         if (o->pickaxe_opts & DIFF_PICKAXE_KIND_G)
 296                 diffcore_pickaxe_grep(o);
 297         else
 298                 diffcore_pickaxe_count(o);
 299 }