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-rw-r--r--diff-index.c296
1 files changed, 296 insertions, 0 deletions
diff --git a/diff-index.c b/diff-index.c
new file mode 100644
index 0000000..bc41d54
--- /dev/null
+++ b/diff-index.c
@@ -0,0 +1,296 @@
+#include "cache.h"
+#include "diff.h"
+
+static int cached_only = 0;
+static int diff_output_format = DIFF_FORMAT_RAW;
+static int diff_line_termination = '\n';
+static int match_nonexisting = 0;
+static int detect_rename = 0;
+static int find_copies_harder = 0;
+static int diff_setup_opt = 0;
+static int diff_score_opt = 0;
+static const char *pickaxe = NULL;
+static int pickaxe_opts = 0;
+static int diff_break_opt = -1;
+static const char *orderfile = NULL;
+static const char *diff_filter = NULL;
+
+/* A file entry went away or appeared */
+static void show_file(const char *prefix, struct cache_entry *ce, unsigned char *sha1, unsigned int mode)
+{
+ diff_addremove(prefix[0], ntohl(mode), sha1, ce->name, NULL);
+}
+
+static int get_stat_data(struct cache_entry *ce, unsigned char **sha1p, unsigned int *modep)
+{
+ unsigned char *sha1 = ce->sha1;
+ unsigned int mode = ce->ce_mode;
+
+ if (!cached_only) {
+ static unsigned char no_sha1[20];
+ int changed;
+ struct stat st;
+ if (lstat(ce->name, &st) < 0) {
+ if (errno == ENOENT && match_nonexisting) {
+ *sha1p = sha1;
+ *modep = mode;
+ return 0;
+ }
+ return -1;
+ }
+ changed = ce_match_stat(ce, &st);
+ if (changed) {
+ mode = create_ce_mode(st.st_mode);
+ sha1 = no_sha1;
+ }
+ }
+
+ *sha1p = sha1;
+ *modep = mode;
+ return 0;
+}
+
+static void show_new_file(struct cache_entry *new)
+{
+ unsigned char *sha1;
+ unsigned int mode;
+
+ /* New file in the index: it might actually be different in the working copy */
+ if (get_stat_data(new, &sha1, &mode) < 0)
+ return;
+
+ show_file("+", new, sha1, mode);
+}
+
+static int show_modified(struct cache_entry *old,
+ struct cache_entry *new,
+ int report_missing)
+{
+ unsigned int mode, oldmode;
+ unsigned char *sha1;
+
+ if (get_stat_data(new, &sha1, &mode) < 0) {
+ if (report_missing)
+ show_file("-", old, old->sha1, old->ce_mode);
+ return -1;
+ }
+
+ oldmode = old->ce_mode;
+ if (mode == oldmode && !memcmp(sha1, old->sha1, 20) &&
+ !find_copies_harder)
+ return 0;
+
+ mode = ntohl(mode);
+ oldmode = ntohl(oldmode);
+
+ diff_change(oldmode, mode,
+ old->sha1, sha1, old->name, NULL);
+ return 0;
+}
+
+static int diff_cache(struct cache_entry **ac, int entries, const char **pathspec)
+{
+ while (entries) {
+ struct cache_entry *ce = *ac;
+ int same = (entries > 1) && ce_same_name(ce, ac[1]);
+
+ if (!ce_path_match(ce, pathspec))
+ goto skip_entry;
+
+ switch (ce_stage(ce)) {
+ case 0:
+ /* No stage 1 entry? That means it's a new file */
+ if (!same) {
+ show_new_file(ce);
+ break;
+ }
+ /* Show difference between old and new */
+ show_modified(ac[1], ce, 1);
+ break;
+ case 1:
+ /* No stage 3 (merge) entry? That means it's been deleted */
+ if (!same) {
+ show_file("-", ce, ce->sha1, ce->ce_mode);
+ break;
+ }
+ /* We come here with ce pointing at stage 1
+ * (original tree) and ac[1] pointing at stage
+ * 3 (unmerged). show-modified with
+ * report-mising set to false does not say the
+ * file is deleted but reports true if work
+ * tree does not have it, in which case we
+ * fall through to report the unmerged state.
+ * Otherwise, we show the differences between
+ * the original tree and the work tree.
+ */
+ if (!cached_only && !show_modified(ce, ac[1], 0))
+ break;
+ /* fallthru */
+ case 3:
+ diff_unmerge(ce->name);
+ break;
+
+ default:
+ die("impossible cache entry stage");
+ }
+
+skip_entry:
+ /*
+ * Ignore all the different stages for this file,
+ * we've handled the relevant cases now.
+ */
+ do {
+ ac++;
+ entries--;
+ } while (entries && ce_same_name(ce, ac[0]));
+ }
+ return 0;
+}
+
+/*
+ * This turns all merge entries into "stage 3". That guarantees that
+ * when we read in the new tree (into "stage 1"), we won't lose sight
+ * of the fact that we had unmerged entries.
+ */
+static void mark_merge_entries(void)
+{
+ int i;
+ for (i = 0; i < active_nr; i++) {
+ struct cache_entry *ce = active_cache[i];
+ if (!ce_stage(ce))
+ continue;
+ ce->ce_flags |= htons(CE_STAGEMASK);
+ }
+}
+
+static const char diff_cache_usage[] =
+"git-diff-index [-m] [--cached] "
+"[<common diff options>] <tree-ish> [<path>...]"
+COMMON_DIFF_OPTIONS_HELP;
+
+int main(int argc, char **argv)
+{
+ const char *tree_name = NULL;
+ unsigned char sha1[20];
+ const char *prefix = setup_git_directory();
+ const char **pathspec = NULL;
+ void *tree;
+ unsigned long size;
+ int ret;
+ int allow_options = 1;
+ int i;
+
+ for (i = 1; i < argc; i++) {
+ const char *arg = argv[i];
+
+ if (!allow_options || *arg != '-') {
+ if (tree_name)
+ break;
+ tree_name = arg;
+ continue;
+ }
+
+ if (!strcmp(arg, "--")) {
+ allow_options = 0;
+ continue;
+ }
+ if (!strcmp(arg, "-r")) {
+ /* We accept the -r flag just to look like git-diff-tree */
+ continue;
+ }
+ /* We accept the -u flag as a synonym for "-p" */
+ if (!strcmp(arg, "-p") || !strcmp(arg, "-u")) {
+ diff_output_format = DIFF_FORMAT_PATCH;
+ continue;
+ }
+ if (!strncmp(arg, "-B", 2)) {
+ if ((diff_break_opt = diff_scoreopt_parse(arg)) == -1)
+ usage(diff_cache_usage);
+ continue;
+ }
+ if (!strncmp(arg, "-M", 2)) {
+ detect_rename = DIFF_DETECT_RENAME;
+ if ((diff_score_opt = diff_scoreopt_parse(arg)) == -1)
+ usage(diff_cache_usage);
+ continue;
+ }
+ if (!strncmp(arg, "-C", 2)) {
+ detect_rename = DIFF_DETECT_COPY;
+ if ((diff_score_opt = diff_scoreopt_parse(arg)) == -1)
+ usage(diff_cache_usage);
+ continue;
+ }
+ if (!strcmp(arg, "--find-copies-harder")) {
+ find_copies_harder = 1;
+ continue;
+ }
+ if (!strcmp(arg, "-z")) {
+ diff_line_termination = 0;
+ continue;
+ }
+ if (!strcmp(arg, "--name-only")) {
+ diff_output_format = DIFF_FORMAT_NAME;
+ continue;
+ }
+ if (!strcmp(arg, "-R")) {
+ diff_setup_opt |= DIFF_SETUP_REVERSE;
+ continue;
+ }
+ if (!strncmp(arg, "-S", 2)) {
+ pickaxe = arg + 2;
+ continue;
+ }
+ if (!strncmp(arg, "--diff-filter=", 14)) {
+ diff_filter = arg + 14;
+ continue;
+ }
+ if (!strncmp(arg, "-O", 2)) {
+ orderfile = arg + 2;
+ continue;
+ }
+ if (!strcmp(arg, "--pickaxe-all")) {
+ pickaxe_opts = DIFF_PICKAXE_ALL;
+ continue;
+ }
+ if (!strcmp(arg, "-m")) {
+ match_nonexisting = 1;
+ continue;
+ }
+ if (!strcmp(arg, "--cached")) {
+ cached_only = 1;
+ continue;
+ }
+ usage(diff_cache_usage);
+ }
+
+ pathspec = get_pathspec(prefix, argv + i);
+
+ if (find_copies_harder && detect_rename != DIFF_DETECT_COPY)
+ usage(diff_cache_usage);
+
+ if (!tree_name || get_sha1(tree_name, sha1))
+ usage(diff_cache_usage);
+
+ read_cache();
+
+ /* The rest is for paths restriction. */
+ diff_setup(diff_setup_opt);
+
+ mark_merge_entries();
+
+ tree = read_object_with_reference(sha1, "tree", &size, NULL);
+ if (!tree)
+ die("bad tree object %s", tree_name);
+ if (read_tree(tree, size, 1, pathspec))
+ die("unable to read tree object %s", tree_name);
+
+ ret = diff_cache(active_cache, active_nr, pathspec);
+
+ diffcore_std(pathspec,
+ detect_rename, diff_score_opt,
+ pickaxe, pickaxe_opts,
+ diff_break_opt,
+ orderfile, diff_filter);
+ diff_flush(diff_output_format, diff_line_termination);
+ return ret;
+}