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