merge(third_party/git): Merge squashed git subtree at v2.23.0

Merge commit '1b593e1ea4' as 'third_party/git'

third_party/git/builtin/rerere.c

@@ -0,0 +1,120 @@
+#include "builtin.h"
+#include "cache.h"
+#include "config.h"
+#include "dir.h"
+#include "parse-options.h"
+#include "string-list.h"
+#include "rerere.h"
+#include "xdiff/xdiff.h"
+#include "xdiff-interface.h"
+#include "pathspec.h"
+
+static const char * const rerere_usage[] = {
+	N_("git rerere [clear | forget <path>... | status | remaining | diff | gc]"),
+	NULL,
+};
+
+static int outf(void *dummy, mmbuffer_t *ptr, int nbuf)
+{
+	int i;
+	for (i = 0; i < nbuf; i++)
+		if (write_in_full(1, ptr[i].ptr, ptr[i].size) < 0)
+			return -1;
+	return 0;
+}
+
+static int diff_two(const char *file1, const char *label1,
+		const char *file2, const char *label2)
+{
+	xpparam_t xpp;
+	xdemitconf_t xecfg;
+	xdemitcb_t ecb;
+	mmfile_t minus, plus;
+	int ret;
+
+	if (read_mmfile(&minus, file1) || read_mmfile(&plus, file2))
+		return -1;
+
+	printf("--- a/%s\n+++ b/%s\n", label1, label2);
+	fflush(stdout);
+	memset(&xpp, 0, sizeof(xpp));
+	xpp.flags = 0;
+	memset(&xecfg, 0, sizeof(xecfg));
+	xecfg.ctxlen = 3;
+	ecb.out_hunk = NULL;
+	ecb.out_line = outf;
+	ret = xdi_diff(&minus, &plus, &xpp, &xecfg, &ecb);
+
+	free(minus.ptr);
+	free(plus.ptr);
+	return ret;
+}
+
+int cmd_rerere(int argc, const char **argv, const char *prefix)
+{
+	struct string_list merge_rr = STRING_LIST_INIT_DUP;
+	int i, autoupdate = -1, flags = 0;
+
+	struct option options[] = {
+		OPT_SET_INT(0, "rerere-autoupdate", &autoupdate,
+			N_("register clean resolutions in index"), 1),
+		OPT_END(),
+	};
+
+	argc = parse_options(argc, argv, prefix, options, rerere_usage, 0);
+
+	git_config(git_xmerge_config, NULL);
+
+	if (autoupdate == 1)
+		flags = RERERE_AUTOUPDATE;
+	if (autoupdate == 0)
+		flags = RERERE_NOAUTOUPDATE;
+
+	if (argc < 1)
+		return repo_rerere(the_repository, flags);
+
+	if (!strcmp(argv[0], "forget")) {
+		struct pathspec pathspec;
+		if (argc < 2)
+			warning(_("'git rerere forget' without paths is deprecated"));
+		parse_pathspec(&pathspec, 0, PATHSPEC_PREFER_CWD,
+			       prefix, argv + 1);
+		return rerere_forget(the_repository, &pathspec);
+	}
+
+	if (!strcmp(argv[0], "clear")) {
+		rerere_clear(the_repository, &merge_rr);
+	} else if (!strcmp(argv[0], "gc"))
+		rerere_gc(the_repository, &merge_rr);
+	else if (!strcmp(argv[0], "status")) {
+		if (setup_rerere(the_repository, &merge_rr,
+				 flags | RERERE_READONLY) < 0)
+			return 0;
+		for (i = 0; i < merge_rr.nr; i++)
+			printf("%s\n", merge_rr.items[i].string);
+	} else if (!strcmp(argv[0], "remaining")) {
+		rerere_remaining(the_repository, &merge_rr);
+		for (i = 0; i < merge_rr.nr; i++) {
+			if (merge_rr.items[i].util != RERERE_RESOLVED)
+				printf("%s\n", merge_rr.items[i].string);
+			else
+				/* prepare for later call to
+				 * string_list_clear() */
+				merge_rr.items[i].util = NULL;
+		}
+	} else if (!strcmp(argv[0], "diff")) {
+		if (setup_rerere(the_repository, &merge_rr,
+				 flags | RERERE_READONLY) < 0)
+			return 0;
+		for (i = 0; i < merge_rr.nr; i++) {
+			const char *path = merge_rr.items[i].string;
+			const struct rerere_id *id = merge_rr.items[i].util;
+			if (diff_two(rerere_path(id, "preimage"), path, path, path))
+				die(_("unable to generate diff for '%s'"), rerere_path(id, NULL));
+		}
+	} else
+		usage_with_options(rerere_usage, options);
+
+	string_list_clear(&merge_rr, 1);
+	return 0;
+}