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![Junio C Hamano](/assets/img/avatar_default.png)
"git log -S<string>" is a useful way to find the last commit in the codebase that touched the <string>. As it was designed to be used by a porcelain script to dig the history starting from a block of text that appear in the starting commit, it never had to look for anything but an exact match. When used by an end user who wants to look for the last commit that removed a string (e.g. name of a variable) that he vaguely remembers, however, it is useful to support case insensitive match. When given the "--regexp-ignore-case" (or "-i") option, which originally was designed to affect case sensitivity of the search done in the commit log part, e.g. "log --grep", the matches made with -S/-G pickaxe search is done case insensitively now. Signed-off-by: Junio C Hamano <gitster@pobox.com>
267 lines
6.1 KiB
C
267 lines
6.1 KiB
C
/*
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* Copyright (C) 2005 Junio C Hamano
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* Copyright (C) 2010 Google Inc.
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*/
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#include "cache.h"
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#include "diff.h"
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#include "diffcore.h"
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#include "xdiff-interface.h"
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#include "kwset.h"
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typedef int (*pickaxe_fn)(struct diff_filepair *p, struct diff_options *o, regex_t *regexp, kwset_t kws);
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static void pickaxe(struct diff_queue_struct *q, struct diff_options *o,
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regex_t *regexp, kwset_t kws, pickaxe_fn fn)
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{
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int i;
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struct diff_queue_struct outq;
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DIFF_QUEUE_CLEAR(&outq);
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if (o->pickaxe_opts & DIFF_PICKAXE_ALL) {
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/* Showing the whole changeset if needle exists */
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for (i = 0; i < q->nr; i++) {
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struct diff_filepair *p = q->queue[i];
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if (fn(p, o, regexp, kws))
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return; /* do not munge the queue */
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}
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/*
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* Otherwise we will clear the whole queue by copying
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* the empty outq at the end of this function, but
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* first clear the current entries in the queue.
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*/
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for (i = 0; i < q->nr; i++)
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diff_free_filepair(q->queue[i]);
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} else {
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/* Showing only the filepairs that has the needle */
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for (i = 0; i < q->nr; i++) {
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struct diff_filepair *p = q->queue[i];
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if (fn(p, o, regexp, kws))
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diff_q(&outq, p);
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else
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diff_free_filepair(p);
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}
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}
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free(q->queue);
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*q = outq;
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}
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struct diffgrep_cb {
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regex_t *regexp;
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int hit;
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};
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static void diffgrep_consume(void *priv, char *line, unsigned long len)
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{
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struct diffgrep_cb *data = priv;
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regmatch_t regmatch;
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int hold;
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if (line[0] != '+' && line[0] != '-')
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return;
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if (data->hit)
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/*
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* NEEDSWORK: we should have a way to terminate the
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* caller early.
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*/
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return;
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/* Yuck -- line ought to be "const char *"! */
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hold = line[len];
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line[len] = '\0';
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data->hit = !regexec(data->regexp, line + 1, 1, ®match, 0);
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line[len] = hold;
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}
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static void fill_one(struct diff_filespec *one,
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mmfile_t *mf, struct userdiff_driver **textconv)
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{
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if (DIFF_FILE_VALID(one)) {
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*textconv = get_textconv(one);
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mf->size = fill_textconv(*textconv, one, &mf->ptr);
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} else {
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memset(mf, 0, sizeof(*mf));
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}
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}
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static int diff_grep(struct diff_filepair *p, struct diff_options *o,
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regex_t *regexp, kwset_t kws)
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{
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regmatch_t regmatch;
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struct userdiff_driver *textconv_one = NULL;
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struct userdiff_driver *textconv_two = NULL;
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mmfile_t mf1, mf2;
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int hit;
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if (diff_unmodified_pair(p))
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return 0;
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fill_one(p->one, &mf1, &textconv_one);
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fill_one(p->two, &mf2, &textconv_two);
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if (!mf1.ptr) {
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if (!mf2.ptr)
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return 0; /* ignore unmerged */
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/* created "two" -- does it have what we are looking for? */
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hit = !regexec(regexp, p->two->data, 1, ®match, 0);
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} else if (!mf2.ptr) {
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/* removed "one" -- did it have what we are looking for? */
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hit = !regexec(regexp, p->one->data, 1, ®match, 0);
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} else {
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/*
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* We have both sides; need to run textual diff and see if
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* the pattern appears on added/deleted lines.
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*/
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struct diffgrep_cb ecbdata;
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xpparam_t xpp;
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xdemitconf_t xecfg;
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memset(&xpp, 0, sizeof(xpp));
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memset(&xecfg, 0, sizeof(xecfg));
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ecbdata.regexp = regexp;
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ecbdata.hit = 0;
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xecfg.ctxlen = o->context;
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xecfg.interhunkctxlen = o->interhunkcontext;
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xdi_diff_outf(&mf1, &mf2, diffgrep_consume, &ecbdata,
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&xpp, &xecfg);
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hit = ecbdata.hit;
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}
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if (textconv_one)
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free(mf1.ptr);
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if (textconv_two)
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free(mf2.ptr);
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return hit;
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}
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static void diffcore_pickaxe_grep(struct diff_options *o)
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{
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int err;
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regex_t regex;
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int cflags = REG_EXTENDED | REG_NEWLINE;
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if (DIFF_OPT_TST(o, PICKAXE_IGNORE_CASE))
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cflags |= REG_ICASE;
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err = regcomp(®ex, o->pickaxe, cflags);
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if (err) {
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char errbuf[1024];
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regerror(err, ®ex, errbuf, 1024);
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regfree(®ex);
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die("invalid log-grep regex: %s", errbuf);
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}
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pickaxe(&diff_queued_diff, o, ®ex, NULL, diff_grep);
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regfree(®ex);
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return;
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}
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static unsigned int contains(struct diff_filespec *one, struct diff_options *o,
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regex_t *regexp, kwset_t kws)
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{
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unsigned int cnt;
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unsigned long sz;
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const char *data;
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if (!o->pickaxe[0])
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return 0;
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if (diff_populate_filespec(one, 0))
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return 0;
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sz = one->size;
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data = one->data;
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cnt = 0;
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if (regexp) {
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regmatch_t regmatch;
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int flags = 0;
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assert(data[sz] == '\0');
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while (*data && !regexec(regexp, data, 1, ®match, flags)) {
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flags |= REG_NOTBOL;
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data += regmatch.rm_eo;
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if (*data && regmatch.rm_so == regmatch.rm_eo)
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data++;
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cnt++;
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}
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} else { /* Classic exact string match */
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while (sz) {
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struct kwsmatch kwsm;
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size_t offset = kwsexec(kws, data, sz, &kwsm);
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const char *found;
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if (offset == -1)
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break;
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else
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found = data + offset;
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sz -= found - data + kwsm.size[0];
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data = found + kwsm.size[0];
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cnt++;
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}
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}
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diff_free_filespec_data(one);
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return cnt;
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}
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static int has_changes(struct diff_filepair *p, struct diff_options *o,
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regex_t *regexp, kwset_t kws)
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{
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if (!DIFF_FILE_VALID(p->one)) {
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if (!DIFF_FILE_VALID(p->two))
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return 0; /* ignore unmerged */
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/* created */
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return contains(p->two, o, regexp, kws) != 0;
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}
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if (!DIFF_FILE_VALID(p->two))
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return contains(p->one, o, regexp, kws) != 0;
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if (!diff_unmodified_pair(p)) {
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return contains(p->one, o, regexp, kws) !=
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contains(p->two, o, regexp, kws);
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}
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return 0;
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}
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static void diffcore_pickaxe_count(struct diff_options *o)
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{
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const char *needle = o->pickaxe;
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int opts = o->pickaxe_opts;
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unsigned long len = strlen(needle);
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regex_t regex, *regexp = NULL;
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kwset_t kws = NULL;
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if (opts & DIFF_PICKAXE_REGEX) {
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int err;
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err = regcomp(®ex, needle, REG_EXTENDED | REG_NEWLINE);
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if (err) {
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/* The POSIX.2 people are surely sick */
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char errbuf[1024];
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regerror(err, ®ex, errbuf, 1024);
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regfree(®ex);
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die("invalid pickaxe regex: %s", errbuf);
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}
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regexp = ®ex;
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} else {
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kws = kwsalloc(DIFF_OPT_TST(o, PICKAXE_IGNORE_CASE)
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? tolower_trans_tbl : NULL);
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kwsincr(kws, needle, len);
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kwsprep(kws);
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}
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pickaxe(&diff_queued_diff, o, regexp, kws, has_changes);
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if (opts & DIFF_PICKAXE_REGEX)
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regfree(®ex);
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else
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kwsfree(kws);
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return;
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}
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void diffcore_pickaxe(struct diff_options *o)
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{
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/* Might want to warn when both S and G are on; I don't care... */
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if (o->pickaxe_opts & DIFF_PICKAXE_KIND_G)
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diffcore_pickaxe_grep(o);
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else
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diffcore_pickaxe_count(o);
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}
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