git

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#include "builtin.h"
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#include "config.h"
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#include "diff.h"
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#include "diff-merges.h"
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#include "commit.h"
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#include "preload-index.h"
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#include "repository.h"
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#include "revision.h"
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#include "setup.h"
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static const char diff_cache_usage[] =
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"git diff-index [-m] [--cached] [--merge-base] "
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"[<common-diff-options>] <tree-ish> [<path>...]"
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"\n"
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COMMON_DIFF_OPTIONS_HELP;
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int cmd_diff_index(int argc, const char **argv, const char *prefix)
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{
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	struct rev_info rev;
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	unsigned int option = 0;
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	int i;
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	int result;
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	if (argc == 2 && !strcmp(argv[1], "-h"))
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		usage(diff_cache_usage);
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	git_config(git_diff_basic_config, NULL); /* no "diff" UI options */
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	prepare_repo_settings(the_repository);
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	the_repository->settings.command_requires_full_index = 0;
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	repo_init_revisions(the_repository, &rev, prefix);
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	rev.abbrev = 0;
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	prefix = precompose_argv_prefix(argc, argv, prefix);
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	/*
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	 * We need (some of) diff for merges options (e.g., --cc), and we need
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	 * to avoid conflict with our own meaning of "-m".
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	 */
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	diff_merges_suppress_m_parsing();
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	argc = setup_revisions(argc, argv, &rev, NULL);
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	for (i = 1; i < argc; i++) {
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		const char *arg = argv[i];
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		if (!strcmp(arg, "--cached"))
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			option |= DIFF_INDEX_CACHED;
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		else if (!strcmp(arg, "--merge-base"))
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			option |= DIFF_INDEX_MERGE_BASE;
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		else if (!strcmp(arg, "-m"))
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			rev.match_missing = 1;
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		else
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			usage(diff_cache_usage);
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	}
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	if (!rev.diffopt.output_format)
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		rev.diffopt.output_format = DIFF_FORMAT_RAW;
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	rev.diffopt.rotate_to_strict = 1;
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	/*
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	 * Make sure there is one revision (i.e. pending object),
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	 * and there is no revision filtering parameters.
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	 */
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	if (rev.pending.nr != 1 ||
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	    rev.max_count != -1 || rev.min_age != -1 || rev.max_age != -1)
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		usage(diff_cache_usage);
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	if (!(option & DIFF_INDEX_CACHED)) {
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		setup_work_tree();
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		if (repo_read_index_preload(the_repository, &rev.diffopt.pathspec, 0) < 0) {
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			perror("repo_read_index_preload");
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			return -1;
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		}
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	} else if (repo_read_index(the_repository) < 0) {
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		perror("repo_read_index");
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		return -1;
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	}
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	run_diff_index(&rev, option);
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	result = diff_result_code(&rev.diffopt);
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	release_revisions(&rev);
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	return result;
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}
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