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