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tag: v1.7.8-rc0
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/*
* Copyright (C) 2005 Junio C Hamano
* Copyright (C) 2010 Google Inc.
*/
#include "cache.h"
#include "diff.h"
#include "diffcore.h"
#include "xdiff-interface.h"
#include "kwset.h"

typedef int (*pickaxe_fn)(struct diff_filepair *p, struct diff_options *o, regex_t *regexp, kwset_t kws);

static void pickaxe(struct diff_queue_struct *q, struct diff_options *o,
regex_t *regexp, kwset_t kws, pickaxe_fn fn)
{
int i;
struct diff_queue_struct outq;

DIFF_QUEUE_CLEAR(&outq);

if (o->pickaxe_opts & DIFF_PICKAXE_ALL) {
/* Showing the whole changeset if needle exists */
for (i = 0; i < q->nr; i++) {
struct diff_filepair *p = q->queue[i];
if (fn(p, o, regexp, kws))
return; /* do not munge the queue */
}

/*
* Otherwise we will clear the whole queue by copying
* the empty outq at the end of this function, but
* first clear the current entries in the queue.
*/
for (i = 0; i < q->nr; i++)
diff_free_filepair(q->queue[i]);
} else {
/* Showing only the filepairs that has the needle */
for (i = 0; i < q->nr; i++) {
struct diff_filepair *p = q->queue[i];
if (fn(p, o, regexp, kws))
diff_q(&outq, p);
else
diff_free_filepair(p);
}
}

free(q->queue);
*q = outq;
}

struct diffgrep_cb {
regex_t *regexp;
int hit;
};

static void diffgrep_consume(void *priv, char *line, unsigned long len)
{
struct diffgrep_cb *data = priv;
regmatch_t regmatch;
int hold;

if (line[0] != '+' && line[0] != '-')
return;
if (data->hit)
/*
* NEEDSWORK: we should have a way to terminate the
* caller early.
*/
return;
/* Yuck -- line ought to be "const char *"! */
hold = line[len];
line[len] = '\0';
data->hit = !regexec(data->regexp, line + 1, 1, &regmatch, 0);
line[len] = hold;
}

static void fill_one(struct diff_filespec *one,
mmfile_t *mf, struct userdiff_driver **textconv)
{
if (DIFF_FILE_VALID(one)) {
*textconv = get_textconv(one);
mf->size = fill_textconv(*textconv, one, &mf->ptr);
} else {
memset(mf, 0, sizeof(*mf));
}
}

static int diff_grep(struct diff_filepair *p, struct diff_options *o,
regex_t *regexp, kwset_t kws)
{
regmatch_t regmatch;
struct userdiff_driver *textconv_one = NULL;
struct userdiff_driver *textconv_two = NULL;
mmfile_t mf1, mf2;
int hit;

if (diff_unmodified_pair(p))
return 0;

fill_one(p->one, &mf1, &textconv_one);
fill_one(p->two, &mf2, &textconv_two);

if (!mf1.ptr) {
if (!mf2.ptr)
return 0; /* ignore unmerged */
/* created "two" -- does it have what we are looking for? */
hit = !regexec(regexp, p->two->data, 1, &regmatch, 0);
} else if (!mf2.ptr) {
/* removed "one" -- did it have what we are looking for? */
hit = !regexec(regexp, p->one->data, 1, &regmatch, 0);
} else {
/*
* We have both sides; need to run textual diff and see if
* the pattern appears on added/deleted lines.
*/
struct diffgrep_cb ecbdata;
xpparam_t xpp;
xdemitconf_t xecfg;

memset(&xpp, 0, sizeof(xpp));
memset(&xecfg, 0, sizeof(xecfg));
ecbdata.regexp = regexp;
ecbdata.hit = 0;
xecfg.ctxlen = o->context;
xecfg.interhunkctxlen = o->interhunkcontext;
xdi_diff_outf(&mf1, &mf2, diffgrep_consume, &ecbdata,
&xpp, &xecfg);
hit = ecbdata.hit;
}
if (textconv_one)
free(mf1.ptr);
if (textconv_two)
free(mf2.ptr);
return hit;
}

static void diffcore_pickaxe_grep(struct diff_options *o)
{
int err;
regex_t regex;

err = regcomp(&regex, o->pickaxe, REG_EXTENDED | REG_NEWLINE);
if (err) {
char errbuf[1024];
regerror(err, &regex, errbuf, 1024);
regfree(&regex);
die("invalid log-grep regex: %s", errbuf);
}

pickaxe(&diff_queued_diff, o, &regex, NULL, diff_grep);

regfree(&regex);
return;
}

static unsigned int contains(struct diff_filespec *one, struct diff_options *o,
regex_t *regexp, kwset_t kws)
{
unsigned int cnt;
unsigned long sz;
const char *data;
if (!o->pickaxe[0])
return 0;
if (diff_populate_filespec(one, 0))
return 0;

sz = one->size;
data = one->data;
cnt = 0;

if (regexp) {
regmatch_t regmatch;
int flags = 0;

assert(data[sz] == '\0');
while (*data && !regexec(regexp, data, 1, &regmatch, flags)) {
flags |= REG_NOTBOL;
data += regmatch.rm_eo;
if (*data && regmatch.rm_so == regmatch.rm_eo)
data++;
cnt++;
}

} else { /* Classic exact string match */
while (sz) {
struct kwsmatch kwsm;
size_t offset = kwsexec(kws, data, sz, &kwsm);
const char *found;
if (offset == -1)
break;
else
found = data + offset;
sz -= found - data + kwsm.size[0];
data = found + kwsm.size[0];
cnt++;
}
}
diff_free_filespec_data(one);
return cnt;
}

static int has_changes(struct diff_filepair *p, struct diff_options *o,
regex_t *regexp, kwset_t kws)
{
if (!DIFF_FILE_VALID(p->one)) {
if (!DIFF_FILE_VALID(p->two))
return 0; /* ignore unmerged */
/* created */
return contains(p->two, o, regexp, kws) != 0;
}
if (!DIFF_FILE_VALID(p->two))
return contains(p->one, o, regexp, kws) != 0;
if (!diff_unmodified_pair(p)) {
return contains(p->one, o, regexp, kws) !=
contains(p->two, o, regexp, kws);
}
return 0;
}

static void diffcore_pickaxe_count(struct diff_options *o)
{
const char *needle = o->pickaxe;
int opts = o->pickaxe_opts;
unsigned long len = strlen(needle);
regex_t regex, *regexp = NULL;
kwset_t kws = NULL;

if (opts & DIFF_PICKAXE_REGEX) {
int err;
err = regcomp(&regex, needle, REG_EXTENDED | REG_NEWLINE);
if (err) {
/* The POSIX.2 people are surely sick */
char errbuf[1024];
regerror(err, &regex, errbuf, 1024);
regfree(&regex);
die("invalid pickaxe regex: %s", errbuf);
}
regexp = &regex;
} else {
kws = kwsalloc(NULL);
kwsincr(kws, needle, len);
kwsprep(kws);
}

pickaxe(&diff_queued_diff, o, regexp, kws, has_changes);

if (opts & DIFF_PICKAXE_REGEX)
regfree(&regex);
else
kwsfree(kws);
return;
}

void diffcore_pickaxe(struct diff_options *o)
{
/* Might want to warn when both S and G are on; I don't care... */
if (o->pickaxe_opts & DIFF_PICKAXE_KIND_G)
diffcore_pickaxe_grep(o);
else
diffcore_pickaxe_count(o);
}
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