Andrew's git - gitweb.git/blob - diffcore-pickaxe.c

   1/*
   2 * Copyright (C) 2005 Junio C Hamano
   3 */
   4#include "cache.h"
   5#include "diff.h"
   6#include "diffcore.h"
   7
   8static unsigned int contains(struct diff_filespec *one,
   9                             const char *needle, unsigned long len,
  10                             regex_t *regexp)
  11{
  12        unsigned int cnt;
  13        unsigned long sz;
  14        const char *data;
  15        if (diff_populate_filespec(one, 0))
  16                return 0;
  17        if (!len)
  18                return 0;
  19
  20        sz = one->size;
  21        data = one->data;
  22        cnt = 0;
  23
  24        if (regexp) {
  25                regmatch_t regmatch;
  26                int flags = 0;
  27
  28                while (*data && !regexec(regexp, data, 1, &regmatch, flags)) {
  29                        flags |= REG_NOTBOL;
  30                        data += regmatch.rm_so;
  31                        if (*data) data++;
  32                        cnt++;
  33                }
  34
  35        } else { /* Classic exact string match */
  36                while (sz) {
  37                        const char *found = memmem(data, sz, needle, len);
  38                        if (!found)
  39                                break;
  40                        sz -= found - data + len;
  41                        data = found + len;
  42                        cnt++;
  43                }
  44        }
  45        diff_free_filespec_data(one);
  46        return cnt;
  47}
  48
  49void diffcore_pickaxe(const char *needle, int opts)
  50{
  51        struct diff_queue_struct *q = &diff_queued_diff;
  52        unsigned long len = strlen(needle);
  53        int i, has_changes;
  54        regex_t regex, *regexp = NULL;
  55        struct diff_queue_struct outq;
  56        outq.queue = NULL;
  57        outq.nr = outq.alloc = 0;
  58
  59        if (opts & DIFF_PICKAXE_REGEX) {
  60                int err;
  61                err = regcomp(&regex, needle, REG_EXTENDED | REG_NEWLINE);
  62                if (err) {
  63                        /* The POSIX.2 people are surely sick */
  64                        char errbuf[1024];
  65                        regerror(err, &regex, errbuf, 1024);
  66                        regfree(&regex);
  67                        die("invalid pickaxe regex: %s", errbuf);
  68                }
  69                regexp = &regex;
  70        }
  71
  72        if (opts & DIFF_PICKAXE_ALL) {
  73                /* Showing the whole changeset if needle exists */
  74                for (i = has_changes = 0; !has_changes && i < q->nr; i++) {
  75                        struct diff_filepair *p = q->queue[i];
  76                        if (!DIFF_FILE_VALID(p->one)) {
  77                                if (!DIFF_FILE_VALID(p->two))
  78                                        continue; /* ignore unmerged */
  79                                /* created */
  80                                if (contains(p->two, needle, len, regexp))
  81                                        has_changes++;
  82                        }
  83                        else if (!DIFF_FILE_VALID(p->two)) {
  84                                if (contains(p->one, needle, len, regexp))
  85                                        has_changes++;
  86                        }
  87                        else if (!diff_unmodified_pair(p) &&
  88                                 contains(p->one, needle, len, regexp) !=
  89                                 contains(p->two, needle, len, regexp))
  90                                has_changes++;
  91                }
  92                if (has_changes)
  93                        return; /* not munge the queue */
  94
  95                /* otherwise we will clear the whole queue
  96                 * by copying the empty outq at the end of this
  97                 * function, but first clear the current entries
  98                 * in the queue.
  99                 */
 100                for (i = 0; i < q->nr; i++)
 101                        diff_free_filepair(q->queue[i]);
 102        }
 103        else
 104                /* Showing only the filepairs that has the needle */
 105                for (i = 0; i < q->nr; i++) {
 106                        struct diff_filepair *p = q->queue[i];
 107                        has_changes = 0;
 108                        if (!DIFF_FILE_VALID(p->one)) {
 109                                if (!DIFF_FILE_VALID(p->two))
 110                                        ; /* ignore unmerged */
 111                                /* created */
 112                                else if (contains(p->two, needle, len, regexp))
 113                                        has_changes = 1;
 114                        }
 115                        else if (!DIFF_FILE_VALID(p->two)) {
 116                                if (contains(p->one, needle, len, regexp))
 117                                        has_changes = 1;
 118                        }
 119                        else if (!diff_unmodified_pair(p) &&
 120                                 contains(p->one, needle, len, regexp) !=
 121                                 contains(p->two, needle, len, regexp))
 122                                has_changes = 1;
 123
 124                        if (has_changes)
 125                                diff_q(&outq, p);
 126                        else
 127                                diff_free_filepair(p);
 128                }
 129
 130        if (opts & DIFF_PICKAXE_REGEX) {
 131                regfree(&regex);
 132        }
 133
 134        free(q->queue);
 135        *q = outq;
 136        return;
 137}