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#define USE_THE_INDEX_COMPATIBILITY_MACROS
#include "cache.h"
#include "config.h"
#include "diff.h"
#include "commit.h"
#include "log-tree.h"
#include "builtin.h"
#include "submodule.h"
#include "repository.h"

static struct rev_info log_tree_opt;

static int diff_tree_commit_oid(const struct object_id *oid)
{
	struct commit *commit = lookup_commit_reference(the_repository, oid);
	if (!commit)
		return -1;
	return log_tree_commit(&log_tree_opt, commit);
}

/* Diff one or more commits. */
static int stdin_diff_commit(struct commit *commit, const char *p)
{
	struct object_id oid;
	struct commit_list **pptr = NULL;

	/* Graft the fake parents locally to the commit */
	while (isspace(*p++) && !parse_oid_hex(p, &oid, &p)) {
		struct commit *parent = lookup_commit(the_repository, &oid);
		if (!pptr) {
			/* Free the real parent list */
			free_commit_list(commit->parents);
			commit->parents = NULL;
			pptr = &(commit->parents);
		}
		if (parent) {
			pptr = &commit_list_insert(parent, pptr)->next;
		}
	}
	return log_tree_commit(&log_tree_opt, commit);
}

/* Diff two trees. */
static int stdin_diff_trees(struct tree *tree1, const char *p)
{
	struct object_id oid;
	struct tree *tree2;
	if (!isspace(*p++) || parse_oid_hex(p, &oid, &p) || *p)
		return error("Need exactly two trees, separated by a space");
	tree2 = lookup_tree(the_repository, &oid);
	if (!tree2 || parse_tree(tree2))
		return -1;
	printf("%s %s\n", oid_to_hex(&tree1->object.oid),
			  oid_to_hex(&tree2->object.oid));
	diff_tree_oid(&tree1->object.oid, &tree2->object.oid,
		      "", &log_tree_opt.diffopt);
	log_tree_diff_flush(&log_tree_opt);
	return 0;
}

static int diff_tree_stdin(char *line)
{
	int len = strlen(line);
	struct object_id oid;
	struct object *obj;
	const char *p;

	if (!len || line[len-1] != '\n')
		return -1;
	line[len-1] = 0;
	if (parse_oid_hex(line, &oid, &p))
		return -1;
	obj = parse_object(the_repository, &oid);
	if (!obj)
		return -1;
	if (obj->type == OBJ_COMMIT)
		return stdin_diff_commit((struct commit *)obj, p);
	if (obj->type == OBJ_TREE)
		return stdin_diff_trees((struct tree *)obj, p);
	error("Object %s is a %s, not a commit or tree",
	      oid_to_hex(&oid), type_name(obj->type));
	return -1;
}

static const char diff_tree_usage[] =
"git diff-tree [--stdin] [-m] [-c | --cc] [-s] [-v] [--pretty] [-t] [-r] [--root] "
"[<common-diff-options>] <tree-ish> [<tree-ish>] [<path>...]\n"
"  -r            diff recursively\n"
"  -c            show combined diff for merge commits\n"
"  --cc          show combined diff for merge commits removing uninteresting hunks\n"
"  --combined-all-paths\n"
"                show name of file in all parents for combined diffs\n"
"  --root        include the initial commit as diff against /dev/null\n"
COMMON_DIFF_OPTIONS_HELP;

static void diff_tree_tweak_rev(struct rev_info *rev, struct setup_revision_opt *opt)
{
	if (!rev->diffopt.output_format) {
		if (rev->dense_combined_merges)
			rev->diffopt.output_format = DIFF_FORMAT_PATCH;
		else
			rev->diffopt.output_format = DIFF_FORMAT_RAW;
	}
}

int cmd_diff_tree(int argc, const char **argv, const char *prefix)
{
	char line[1000];
	struct object *tree1, *tree2;
	static struct rev_info *opt = &log_tree_opt;
	struct setup_revision_opt s_r_opt;
	struct userformat_want w;
	int read_stdin = 0;
	int merge_base = 0;

	if (argc == 2 && !strcmp(argv[1], "-h"))
		usage(diff_tree_usage);

	git_config(git_diff_basic_config, NULL); /* no "diff" UI options */
	repo_init_revisions(the_repository, opt, prefix);
	if (read_cache() < 0)
		die(_("index file corrupt"));
	opt->abbrev = 0;
	opt->diff = 1;
	opt->disable_stdin = 1;
	memset(&s_r_opt, 0, sizeof(s_r_opt));
	s_r_opt.tweak = diff_tree_tweak_rev;

	precompose_argv(argc, argv);
	argc = setup_revisions(argc, argv, opt, &s_r_opt);

	memset(&w, 0, sizeof(w));
	userformat_find_requirements(NULL, &w);

	if (!opt->show_notes_given && w.notes)
		opt->show_notes = 1;
	if (opt->show_notes)
		load_display_notes(&opt->notes_opt);

	while (--argc > 0) {
		const char *arg = *++argv;

		if (!strcmp(arg, "--stdin")) {
			read_stdin = 1;
			continue;
		}
		if (!strcmp(arg, "--merge-base")) {
			merge_base = 1;
			continue;
		}
		usage(diff_tree_usage);
	}

	if (read_stdin && merge_base)
		die(_("--stdin and --merge-base are mutually exclusive"));

	if (merge_base) {
		struct object_id oid;

		if (opt->pending.nr != 2)
			die(_("--merge-base only works with two commits"));

		diff_get_merge_base(opt, &oid);
		opt->pending.objects[0].item = lookup_object(the_repository, &oid);
	}

	/*
	 * NOTE!  We expect "a..b" to expand to "^a b" but it is
	 * perfectly valid for revision range parser to yield "b ^a",
	 * which means the same thing. If we get the latter, i.e. the
	 * second one is marked UNINTERESTING, we recover the original
	 * order the user gave, i.e. "a..b", by swapping the trees.
	 */
	switch (opt->pending.nr) {
	case 0:
		if (!read_stdin)
			usage(diff_tree_usage);
		break;
	case 1:
		tree1 = opt->pending.objects[0].item;
		diff_tree_commit_oid(&tree1->oid);
		break;
	case 2:
		tree1 = opt->pending.objects[0].item;
		tree2 = opt->pending.objects[1].item;
		if (tree2->flags & UNINTERESTING) {
			SWAP(tree2, tree1);
		}
		diff_tree_oid(&tree1->oid, &tree2->oid, "", &opt->diffopt);
		log_tree_diff_flush(opt);
		break;
	}

	if (read_stdin) {
		int saved_nrl = 0;
		int saved_dcctc = 0;

		if (opt->diffopt.detect_rename) {
			if (!the_index.cache)
				repo_read_index(the_repository);
			opt->diffopt.setup |= DIFF_SETUP_USE_SIZE_CACHE;
		}
		while (fgets(line, sizeof(line), stdin)) {
			struct object_id oid;

			if (get_oid_hex(line, &oid)) {
				fputs(line, stdout);
				fflush(stdout);
			}
			else {
				diff_tree_stdin(line);
				if (saved_nrl < opt->diffopt.needed_rename_limit)
					saved_nrl = opt->diffopt.needed_rename_limit;
				if (opt->diffopt.degraded_cc_to_c)
					saved_dcctc = 1;
			}
		}
		opt->diffopt.degraded_cc_to_c = saved_dcctc;
		opt->diffopt.needed_rename_limit = saved_nrl;
	}

	return diff_result_code(&opt->diffopt, 0);
}
debug log:

solving 823d6678e5 ...
found 823d6678e5 in https://public-inbox.org/git/4880d21119c8b67ab53db8ce82196855f6e8680f.1600600823.git.liu.denton@gmail.com/ ||
	https://public-inbox.org/git/c0d27b125e969e13c52b0fa806a8e3caa8c20ac6.1600328336.git.liu.denton@gmail.com/
found 802363d0a2 in git.git.git
preparing index
index prepared:
100644 802363d0a2295f855828121a5b99184d6475b74f	builtin/diff-tree.c

applying [1/2] https://public-inbox.org/git/4880d21119c8b67ab53db8ce82196855f6e8680f.1600600823.git.liu.denton@gmail.com/
diff --git a/builtin/diff-tree.c b/builtin/diff-tree.c
index 802363d0a2..823d6678e5 100644

Checking patch builtin/diff-tree.c...
Applied patch builtin/diff-tree.c cleanly.

skipping https://public-inbox.org/git/c0d27b125e969e13c52b0fa806a8e3caa8c20ac6.1600328336.git.liu.denton@gmail.com/ for 823d6678e5
index at:
100644 823d6678e5d4f744f5143bf1cca668890c03f685	builtin/diff-tree.c

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