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-rw-r--r--builtin/diff-index.c79
1 files changed, 79 insertions, 0 deletions
diff --git a/builtin/diff-index.c b/builtin/diff-index.c
new file mode 100644
index 0000000..220f341
--- /dev/null
+++ b/builtin/diff-index.c
@@ -0,0 +1,79 @@
+#include "builtin.h"
+#include "config.h"
+#include "diff.h"
+#include "diff-merges.h"
+#include "commit.h"
+#include "preload-index.h"
+#include "repository.h"
+#include "revision.h"
+#include "setup.h"
+#include "sparse-index.h"
+#include "submodule.h"
+
+static const char diff_cache_usage[] =
+"git diff-index [-m] [--cached] [--merge-base] "
+"[<common-diff-options>] <tree-ish> [<path>...]"
+"\n"
+COMMON_DIFF_OPTIONS_HELP;
+
+int cmd_diff_index(int argc, const char **argv, const char *prefix)
+{
+ struct rev_info rev;
+ unsigned int option = 0;
+ int i;
+ int result;
+
+ if (argc == 2 && !strcmp(argv[1], "-h"))
+ usage(diff_cache_usage);
+
+ git_config(git_diff_basic_config, NULL); /* no "diff" UI options */
+ repo_init_revisions(the_repository, &rev, prefix);
+ rev.abbrev = 0;
+ prefix = precompose_argv_prefix(argc, argv, prefix);
+
+ /*
+ * We need (some of) diff for merges options (e.g., --cc), and we need
+ * to avoid conflict with our own meaning of "-m".
+ */
+ diff_merges_suppress_m_parsing();
+
+ argc = setup_revisions(argc, argv, &rev, NULL);
+ for (i = 1; i < argc; i++) {
+ const char *arg = argv[i];
+
+ if (!strcmp(arg, "--cached"))
+ option |= DIFF_INDEX_CACHED;
+ else if (!strcmp(arg, "--merge-base"))
+ option |= DIFF_INDEX_MERGE_BASE;
+ else if (!strcmp(arg, "-m"))
+ rev.match_missing = 1;
+ else
+ usage(diff_cache_usage);
+ }
+ if (!rev.diffopt.output_format)
+ rev.diffopt.output_format = DIFF_FORMAT_RAW;
+
+ rev.diffopt.rotate_to_strict = 1;
+
+ /*
+ * Make sure there is one revision (i.e. pending object),
+ * and there is no revision filtering parameters.
+ */
+ if (rev.pending.nr != 1 ||
+ rev.max_count != -1 || rev.min_age != -1 || rev.max_age != -1)
+ usage(diff_cache_usage);
+ if (!(option & DIFF_INDEX_CACHED)) {
+ setup_work_tree();
+ if (repo_read_index_preload(the_repository, &rev.diffopt.pathspec, 0) < 0) {
+ perror("repo_read_index_preload");
+ return -1;
+ }
+ } else if (repo_read_index(the_repository) < 0) {
+ perror("repo_read_index");
+ return -1;
+ }
+ run_diff_index(&rev, option);
+ result = diff_result_code(&rev.diffopt);
+ release_revisions(&rev);
+ return result;
+}