diffcore-pickaxe.c - git - Git at Google

 /*
  * Copyright (C) 2005 Junio C Hamano
  * Copyright (C) 2010 Google Inc.
  */
 #include "cache.h"
 #include "diff.h"
 #include "diffcore.h"
 #include "xdiff-interface.h"

 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, regex_t *regexp, struct diff_options *o)
 {
 	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)
 {
 	struct diff_queue_struct *q = &diff_queued_diff;
 	int i, has_changes, err;
 	regex_t regex;
 	struct diff_queue_struct outq;
 	outq.queue = NULL;
 	outq.nr = outq.alloc = 0;

 	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);
 	}

 	if (o->pickaxe_opts & DIFF_PICKAXE_ALL) {
 		/* Showing the whole changeset if needle exists */
 		for (i = has_changes = 0; !has_changes && i < q->nr; i++) {
 			struct diff_filepair *p = q->queue[i];
 			if (diff_grep(p, &regex, o))
 				has_changes++;
 		}
 		if (has_changes)
 			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 (diff_grep(p, &regex, o))
 				diff_q(&outq, p);
 			else
 				diff_free_filepair(p);
 		}
 	}

 	regfree(&regex);

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

 static unsigned int contains(struct diff_filespec *one,
 			     const char *needle, unsigned long len,
 			     regex_t *regexp)
 {
 	unsigned int cnt;
 	unsigned long sz;
 	const char *data;
 	if (diff_populate_filespec(one, 0))
 		return 0;
 	if (!len)
 		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) {
 			const char *found = memmem(data, sz, needle, len);
 			if (!found)
 				break;
 			sz -= found - data + len;
 			data = found + len;
 			cnt++;
 		}
 	}
 	diff_free_filespec_data(one);
 	return cnt;
 }

 static void diffcore_pickaxe_count(struct diff_options *o)
 {
 	const char *needle = o->pickaxe;
 	int opts = o->pickaxe_opts;
 	struct diff_queue_struct *q = &diff_queued_diff;
 	unsigned long len = strlen(needle);
 	int i, has_changes;
 	regex_t regex, *regexp = NULL;
 	struct diff_queue_struct outq;
 	DIFF_QUEUE_CLEAR(&outq);

 	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;
 	}

 	if (opts & DIFF_PICKAXE_ALL) {
 		/* Showing the whole changeset if needle exists */
 		for (i = has_changes = 0; !has_changes && i < q->nr; i++) {
 			struct diff_filepair *p = q->queue[i];
 			if (!DIFF_FILE_VALID(p->one)) {
 				if (!DIFF_FILE_VALID(p->two))
 					continue; /* ignore unmerged */
 				/* created */
 				if (contains(p->two, needle, len, regexp))
 					has_changes++;
 			}
 			else if (!DIFF_FILE_VALID(p->two)) {
 				if (contains(p->one, needle, len, regexp))
 					has_changes++;
 			}
 			else if (!diff_unmodified_pair(p) &&
 				 contains(p->one, needle, len, regexp) !=
 				 contains(p->two, needle, len, regexp))
 				has_changes++;
 		}
 		if (has_changes)
 			return; /* 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];
 			has_changes = 0;
 			if (!DIFF_FILE_VALID(p->one)) {
 				if (!DIFF_FILE_VALID(p->two))
 					; /* ignore unmerged */
 				/* created */
 				else if (contains(p->two, needle, len, regexp))
 					has_changes = 1;
 			}
 			else if (!DIFF_FILE_VALID(p->two)) {
 				if (contains(p->one, needle, len, regexp))
 					has_changes = 1;
 			}
 			else if (!diff_unmodified_pair(p) &&
 				 contains(p->one, needle, len, regexp) !=
 				 contains(p->two, needle, len, regexp))
 				has_changes = 1;

 			if (has_changes)
 				diff_q(&outq, p);
 			else
 				diff_free_filepair(p);
 		}

 	if (opts & DIFF_PICKAXE_REGEX)
 		regfree(&regex);

 	free(q->queue);
 	*q = outq;
 	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);
 }
	/*
	* Copyright (C) 2005 Junio C Hamano
	* Copyright (C) 2010 Google Inc.
	*/
	#include "cache.h"
	#include "diff.h"
	#include "diffcore.h"
	#include "xdiff-interface.h"

	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, regex_t regexp, struct diff_options *o)
	{
	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)
	{
	struct diff_queue_struct *q = &diff_queued_diff;
	int i, has_changes, err;
	regex_t regex;
	struct diff_queue_struct outq;
	outq.queue = NULL;
	outq.nr = outq.alloc = 0;

	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);
	}

	if (o->pickaxe_opts & DIFF_PICKAXE_ALL) {
	/* Showing the whole changeset if needle exists */
	for (i = has_changes = 0; !has_changes && i < q->nr; i++) {
	struct diff_filepair *p = q->queue[i];
	if (diff_grep(p, &regex, o))
	has_changes++;
	}
	if (has_changes)
	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 (diff_grep(p, &regex, o))
	diff_q(&outq, p);
	else
	diff_free_filepair(p);
	}
	}

	regfree(&regex);

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

	static unsigned int contains(struct diff_filespec *one,
	const char *needle, unsigned long len,
	regex_t *regexp)
	{
	unsigned int cnt;
	unsigned long sz;
	const char *data;
	if (diff_populate_filespec(one, 0))
	return 0;
	if (!len)
	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) {
	const char *found = memmem(data, sz, needle, len);
	if (!found)
	break;
	sz -= found - data + len;
	data = found + len;
	cnt++;
	}
	}
	diff_free_filespec_data(one);
	return cnt;
	}

	static void diffcore_pickaxe_count(struct diff_options *o)
	{
	const char *needle = o->pickaxe;
	int opts = o->pickaxe_opts;
	struct diff_queue_struct *q = &diff_queued_diff;
	unsigned long len = strlen(needle);
	int i, has_changes;
	regex_t regex, *regexp = NULL;
	struct diff_queue_struct outq;
	DIFF_QUEUE_CLEAR(&outq);

	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;
	}

	if (opts & DIFF_PICKAXE_ALL) {
	/* Showing the whole changeset if needle exists */
	for (i = has_changes = 0; !has_changes && i < q->nr; i++) {
	struct diff_filepair *p = q->queue[i];
	if (!DIFF_FILE_VALID(p->one)) {
	if (!DIFF_FILE_VALID(p->two))
	continue; /* ignore unmerged */
	/* created */
	if (contains(p->two, needle, len, regexp))
	has_changes++;
	}
	else if (!DIFF_FILE_VALID(p->two)) {
	if (contains(p->one, needle, len, regexp))
	has_changes++;
	}
	else if (!diff_unmodified_pair(p) &&
	contains(p->one, needle, len, regexp) !=
	contains(p->two, needle, len, regexp))
	has_changes++;
	}
	if (has_changes)
	return; /* 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];
	has_changes = 0;
	if (!DIFF_FILE_VALID(p->one)) {
	if (!DIFF_FILE_VALID(p->two))
	; /* ignore unmerged */
	/* created */
	else if (contains(p->two, needle, len, regexp))
	has_changes = 1;
	}
	else if (!DIFF_FILE_VALID(p->two)) {
	if (contains(p->one, needle, len, regexp))
	has_changes = 1;
	}
	else if (!diff_unmodified_pair(p) &&
	contains(p->one, needle, len, regexp) !=
	contains(p->two, needle, len, regexp))
	has_changes = 1;

	if (has_changes)
	diff_q(&outq, p);
	else
	diff_free_filepair(p);
	}

	if (opts & DIFF_PICKAXE_REGEX)
	regfree(&regex);

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