Andrew's git - gitweb.git/blob - 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
  11struct diffgrep_cb {
  12        regex_t *regexp;
  13        int hit;
  14};
  15
  16static 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
  37static 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
  48static 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
  96static 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
 148static 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
 194static 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
 292void 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}