Adding upstream version 1:2.39.2.upstream/1%2.39.2upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 290 insertions, 0 deletions

diff --git a/diffcore-pickaxe.c b/diffcore-pickaxe.c
new file mode 100644
index 0000000..03fcbcb
--- /dev/null
+++ b/diffcore-pickaxe.c
@@ -0,0 +1,290 @@
+/*
+ * 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"
+#include "commit.h"
+#include "quote.h"
+
+typedef int (*pickaxe_fn)(mmfile_t *one, mmfile_t *two,
+			  struct diff_options *o,
+			  regex_t *regexp, kwset_t kws);
+
+struct diffgrep_cb {
+	regex_t *regexp;
+	int hit;
+};
+
+static int diffgrep_consume(void *priv, char *line, unsigned long len)
+{
+	struct diffgrep_cb *data = priv;
+	regmatch_t regmatch;
+
+	if (line[0] != '+' && line[0] != '-')
+		return 0;
+	if (data->hit)
+		BUG("Already matched in diffgrep_consume! Broken xdiff_emit_line_fn?");
+	if (!regexec_buf(data->regexp, line + 1, len - 1, 1,
+			 &regmatch, 0)) {
+		data->hit = 1;
+		return 1;
+	}
+	return 0;
+}
+
+static int diff_grep(mmfile_t *one, mmfile_t *two,
+		     struct diff_options *o,
+		     regex_t *regexp, kwset_t kws UNUSED)
+{
+	struct diffgrep_cb ecbdata;
+	xpparam_t xpp;
+	xdemitconf_t xecfg;
+	int ret;
+
+	/*
+	 * We have both sides; need to run textual diff and see if
+	 * the pattern appears on added/deleted lines.
+	 */
+	memset(&xpp, 0, sizeof(xpp));
+	memset(&xecfg, 0, sizeof(xecfg));
+	ecbdata.regexp = regexp;
+	ecbdata.hit = 0;
+	xecfg.flags = XDL_EMIT_NO_HUNK_HDR;
+	xecfg.ctxlen = o->context;
+	xecfg.interhunkctxlen = o->interhunkcontext;
+
+	/*
+	 * An xdiff error might be our "data->hit" from above. See the
+	 * comment for xdiff_emit_line_fn in xdiff-interface.h
+	 */
+	ret = xdi_diff_outf(one, two, NULL, diffgrep_consume,
+			    &ecbdata, &xpp, &xecfg);
+	if (ecbdata.hit)
+		return 1;
+	if (ret)
+		return ret;
+	return 0;
+}
+
+static unsigned int contains(mmfile_t *mf, regex_t *regexp, kwset_t kws,
+			     unsigned int limit)
+{
+	unsigned int cnt = 0;
+	unsigned long sz = mf->size;
+	const char *data = mf->ptr;
+
+	if (regexp) {
+		regmatch_t regmatch;
+		int flags = 0;
+
+		while (sz &&
+		       !regexec_buf(regexp, data, sz, 1, &regmatch, flags)) {
+			flags |= REG_NOTBOL;
+			data += regmatch.rm_eo;
+			sz -= regmatch.rm_eo;
+			if (sz && regmatch.rm_so == regmatch.rm_eo) {
+				data++;
+				sz--;
+			}
+			cnt++;
+
+			if (limit && cnt == limit)
+				return cnt;
+		}
+
+	} else { /* Classic exact string match */
+		while (sz) {
+			struct kwsmatch kwsm;
+			size_t offset = kwsexec(kws, data, sz, &kwsm);
+			if (offset == -1)
+				break;
+			sz -= offset + kwsm.size[0];
+			data += offset + kwsm.size[0];
+			cnt++;
+
+			if (limit && cnt == limit)
+				return cnt;
+		}
+	}
+	return cnt;
+}
+
+static int has_changes(mmfile_t *one, mmfile_t *two,
+		       struct diff_options *o UNUSED,
+		       regex_t *regexp, kwset_t kws)
+{
+	unsigned int c1 = one ? contains(one, regexp, kws, 0) : 0;
+	unsigned int c2 = two ? contains(two, regexp, kws, c1 + 1) : 0;
+	return c1 != c2;
+}
+
+static int pickaxe_match(struct diff_filepair *p, struct diff_options *o,
+			 regex_t *regexp, kwset_t kws, pickaxe_fn fn)
+{
+	struct userdiff_driver *textconv_one = NULL;
+	struct userdiff_driver *textconv_two = NULL;
+	mmfile_t mf1, mf2;
+	int ret;
+
+	/* ignore unmerged */
+	if (!DIFF_FILE_VALID(p->one) && !DIFF_FILE_VALID(p->two))
+		return 0;
+
+	if (o->objfind) {
+		return  (DIFF_FILE_VALID(p->one) &&
+			 oidset_contains(o->objfind, &p->one->oid)) ||
+			(DIFF_FILE_VALID(p->two) &&
+			 oidset_contains(o->objfind, &p->two->oid));
+	}
+
+	if (o->flags.allow_textconv) {
+		textconv_one = get_textconv(o->repo, p->one);
+		textconv_two = get_textconv(o->repo, p->two);
+	}
+
+	/*
+	 * If we have an unmodified pair, we know that the count will be the
+	 * same and don't even have to load the blobs. Unless textconv is in
+	 * play, _and_ we are using two different textconv filters (e.g.,
+	 * because a pair is an exact rename with different textconv attributes
+	 * for each side, which might generate different content).
+	 */
+	if (textconv_one == textconv_two && diff_unmodified_pair(p))
+		return 0;
+
+	if ((o->pickaxe_opts & DIFF_PICKAXE_KIND_G) &&
+	    !o->flags.text &&
+	    ((!textconv_one && diff_filespec_is_binary(o->repo, p->one)) ||
+	     (!textconv_two && diff_filespec_is_binary(o->repo, p->two))))
+		return 0;
+
+	mf1.size = fill_textconv(o->repo, textconv_one, p->one, &mf1.ptr);
+	mf2.size = fill_textconv(o->repo, textconv_two, p->two, &mf2.ptr);
+
+	ret = fn(&mf1, &mf2, o, regexp, kws);
+
+	if (textconv_one)
+		free(mf1.ptr);
+	if (textconv_two)
+		free(mf2.ptr);
+	diff_free_filespec_data(p->one);
+	diff_free_filespec_data(p->two);
+
+	return ret;
+}
+
+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 (pickaxe_match(p, o, regexp, kws, fn))
+				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 (pickaxe_match(p, o, regexp, kws, fn))
+				diff_q(&outq, p);
+			else
+				diff_free_filepair(p);
+		}
+	}
+
+	free(q->queue);
+	*q = outq;
+}
+
+static void regcomp_or_die(regex_t *regex, const char *needle, int cflags)
+{
+	int err = regcomp(regex, needle, cflags);
+	if (err) {
+		/* The POSIX.2 people are surely sick */
+		char errbuf[1024];
+		regerror(err, regex, errbuf, 1024);
+		die("invalid regex: %s", errbuf);
+	}
+}
+
+void diffcore_pickaxe(struct diff_options *o)
+{
+	const char *needle = o->pickaxe;
+	int opts = o->pickaxe_opts;
+	regex_t regex, *regexp = NULL;
+	kwset_t kws = NULL;
+	pickaxe_fn fn;
+
+	if (opts & ~DIFF_PICKAXE_KIND_OBJFIND &&
+	    (!needle || !*needle))
+		BUG("should have needle under -G or -S");
+	if (opts & (DIFF_PICKAXE_REGEX | DIFF_PICKAXE_KIND_G)) {
+		int cflags = REG_EXTENDED | REG_NEWLINE;
+		if (o->pickaxe_opts & DIFF_PICKAXE_IGNORE_CASE)
+			cflags |= REG_ICASE;
+		regcomp_or_die(&regex, needle, cflags);
+		regexp = &regex;
+
+		if (opts & DIFF_PICKAXE_KIND_G)
+			fn = diff_grep;
+		else if (opts & DIFF_PICKAXE_REGEX)
+			fn = has_changes;
+		else
+			/*
+			 * We don't need to check the combination of
+			 * -G and --pickaxe-regex, by the time we get
+			 * here diff.c has already died if they're
+			 * combined. See the usage tests in
+			 * t4209-log-pickaxe.sh.
+			 */
+			BUG("unreachable");
+	} else if (opts & DIFF_PICKAXE_KIND_S) {
+		if (o->pickaxe_opts & DIFF_PICKAXE_IGNORE_CASE &&
+		    has_non_ascii(needle)) {
+			struct strbuf sb = STRBUF_INIT;
+			int cflags = REG_NEWLINE | REG_ICASE;
+
+			basic_regex_quote_buf(&sb, needle);
+			regcomp_or_die(&regex, sb.buf, cflags);
+			strbuf_release(&sb);
+			regexp = &regex;
+		} else {
+			kws = kwsalloc(o->pickaxe_opts & DIFF_PICKAXE_IGNORE_CASE
+				       ? tolower_trans_tbl : NULL);
+			kwsincr(kws, needle, strlen(needle));
+			kwsprep(kws);
+		}
+		fn = has_changes;
+	} else if (opts & DIFF_PICKAXE_KIND_OBJFIND) {
+		fn = NULL;
+	} else {
+		BUG("unknown pickaxe_opts flag");
+	}
+
+	pickaxe(&diff_queued_diff, o, regexp, kws, fn);
+
+	if (regexp)
+		regfree(regexp);
+	if (kws)
+		kwsfree(kws);
+	return;
+}