#include "cache.h"
+#include "diff.h"
+#include "commit.h"
-static int recursive = 0;
+static int show_root_diff = 0;
+static int no_commit_id = 0;
+static int verbose_header = 0;
+static int ignore_merges = 1;
+static int combine_merges = 0;
+static int dense_combined_merges = 0;
+static int read_stdin = 0;
+static int always_show_header = 0;
-static int diff_tree_sha1(const unsigned char *old, const unsigned char *new, const char *base);
+static const char *header = NULL;
+static const char *header_prefix = "";
+static enum cmit_fmt commit_format = CMIT_FMT_RAW;
-static void update_tree_entry(void **bufp, unsigned long *sizep)
+static struct diff_options diff_options;
+
+static int call_diff_flush(void)
{
- void *buf = *bufp;
- unsigned long size = *sizep;
- int len = strlen(buf) + 1 + 20;
-
- if (size < len)
- die("corrupt tree file");
- *bufp = buf + len;
- *sizep = size - len;
+ diffcore_std(&diff_options);
+ if (diff_queue_is_empty()) {
+ int saved_fmt = diff_options.output_format;
+ diff_options.output_format = DIFF_FORMAT_NO_OUTPUT;
+ diff_flush(&diff_options);
+ diff_options.output_format = saved_fmt;
+ return 0;
+ }
+ if (header) {
+ if (!no_commit_id)
+ printf("%s%c", header, diff_options.line_termination);
+ header = NULL;
+ }
+ diff_flush(&diff_options);
+ return 1;
}
-static const unsigned char *extract(void *tree, unsigned long size, const char **pathp, unsigned int *modep)
+static int diff_tree_sha1_top(const unsigned char *old,
+ const unsigned char *new, const char *base)
{
- int len = strlen(tree)+1;
- const unsigned char *sha1 = tree + len;
- const char *path = strchr(tree, ' ');
-
- if (!path || size < len + 20 || sscanf(tree, "%o", modep) != 1)
- die("corrupt tree file");
- *pathp = path+1;
- return sha1;
+ int ret;
+
+ ret = diff_tree_sha1(old, new, base, &diff_options);
+ call_diff_flush();
+ return ret;
}
-static char *malloc_base(const char *base, const char *path, int pathlen)
+static int diff_root_tree(const unsigned char *new, const char *base)
{
- int baselen = strlen(base);
- char *newbase = malloc(baselen + pathlen + 2);
- memcpy(newbase, base, baselen);
- memcpy(newbase + baselen, path, pathlen);
- memcpy(newbase + baselen + pathlen, "/", 2);
- return newbase;
-}
+ int retval;
+ void *tree;
+ struct tree_desc empty, real;
-static void show_file(const char *prefix, void *tree, unsigned long size, const char *base);
+ tree = read_object_with_reference(new, "tree", &real.size, NULL);
+ if (!tree)
+ die("unable to read root tree (%s)", sha1_to_hex(new));
+ real.buf = tree;
-/* A whole sub-tree went away or appeared */
-static void show_tree(const char *prefix, void *tree, unsigned long size, const char *base)
-{
- while (size) {
- show_file(prefix, tree, size, base);
- update_tree_entry(&tree, &size);
- }
+ empty.buf = "";
+ empty.size = 0;
+ retval = diff_tree(&empty, &real, base, &diff_options);
+ free(tree);
+ call_diff_flush();
+ return retval;
}
-/* A file entry went away or appeared */
-static void show_file(const char *prefix, void *tree, unsigned long size, const char *base)
+static const char *generate_header(const unsigned char *commit_sha1,
+ const unsigned char *parent_sha1,
+ const struct commit *commit)
{
- unsigned mode;
- const char *path;
- const unsigned char *sha1 = extract(tree, size, &path, &mode);
-
- if (recursive && S_ISDIR(mode)) {
- char type[20];
- unsigned long size;
- char *newbase = malloc_base(base, path, strlen(path));
- void *tree;
-
- tree = read_sha1_file(sha1, type, &size);
- if (!tree || strcmp(type, "tree"))
- die("corrupt tree sha %s", sha1_to_hex(sha1));
-
- show_tree(prefix, tree, size, newbase);
-
- free(tree);
- free(newbase);
- return;
- }
+ static char this_header[16384];
+ int offset;
+ unsigned long len;
+ int abbrev = diff_options.abbrev;
+ const char *msg = commit->buffer;
+
+ if (!verbose_header)
+ return sha1_to_hex(commit_sha1);
+
+ len = strlen(msg);
- printf("%s%o %s %s%s%c", prefix, mode, sha1_to_hex(sha1), base, path, 0);
+ offset = sprintf(this_header, "%s%s ",
+ header_prefix,
+ diff_unique_abbrev(commit_sha1, abbrev));
+ if (commit_sha1 != parent_sha1)
+ offset += sprintf(this_header + offset, "(from %s)\n",
+ parent_sha1
+ ? diff_unique_abbrev(parent_sha1, abbrev)
+ : "root");
+ else
+ offset += sprintf(this_header + offset, "(from parents)\n");
+ offset += pretty_print_commit(commit_format, commit, len,
+ this_header + offset,
+ sizeof(this_header) - offset, abbrev);
+ if (always_show_header) {
+ puts(this_header);
+ return NULL;
+ }
+ return this_header;
}
-static int compare_tree_entry(void *tree1, unsigned long size1, void *tree2, unsigned long size2, const char *base)
+static int diff_tree_commit(struct commit *commit)
{
- unsigned mode1, mode2;
- const char *path1, *path2;
- const unsigned char *sha1, *sha2;
- int cmp, pathlen1, pathlen2;
- char old_sha1_hex[50];
-
- sha1 = extract(tree1, size1, &path1, &mode1);
- sha2 = extract(tree2, size2, &path2, &mode2);
-
- pathlen1 = strlen(path1);
- pathlen2 = strlen(path2);
- cmp = cache_name_compare(path1, pathlen1, path2, pathlen2);
- if (cmp < 0) {
- show_file("-", tree1, size1, base);
- return -1;
- }
- if (cmp > 0) {
- show_file("+", tree2, size2, base);
- return 1;
- }
- if (!memcmp(sha1, sha2, 20) && mode1 == mode2)
- return 0;
+ struct commit_list *parents;
+ unsigned const char *sha1 = commit->object.sha1;
- /*
- * If the filemode has changed to/from a directory from/to a regular
- * file, we need to consider it a remove and an add.
- */
- if (S_ISDIR(mode1) != S_ISDIR(mode2)) {
- show_file("-", tree1, size1, base);
- show_file("+", tree2, size2, base);
- return 0;
+ /* Root commit? */
+ if (show_root_diff && !commit->parents) {
+ header = generate_header(sha1, NULL, commit);
+ diff_root_tree(sha1, "");
}
- if (recursive && S_ISDIR(mode1)) {
- int retval;
- char *newbase = malloc_base(base, path1, pathlen1);
- retval = diff_tree_sha1(sha1, sha2, newbase);
- free(newbase);
- return retval;
+ /* More than one parent? */
+ if (commit->parents && commit->parents->next) {
+ if (ignore_merges)
+ return 0;
+ else if (combine_merges) {
+ header = generate_header(sha1, sha1, commit);
+ header = diff_tree_combined_merge(sha1, header,
+ dense_combined_merges,
+ &diff_options);
+ if (!header && verbose_header)
+ header_prefix = "\ndiff-tree ";
+ return 0;
+ }
}
- strcpy(old_sha1_hex, sha1_to_hex(sha1));
- printf("*%o->%o %s->%s %s%s%c", mode1, mode2, old_sha1_hex, sha1_to_hex(sha2), base, path1, 0);
+ for (parents = commit->parents; parents; parents = parents->next) {
+ struct commit *parent = parents->item;
+ header = generate_header(sha1, parent->object.sha1, commit);
+ diff_tree_sha1_top(parent->object.sha1, sha1, "");
+ if (!header && verbose_header) {
+ header_prefix = "\ndiff-tree ";
+ /*
+ * Don't print multiple merge entries if we
+ * don't print the diffs.
+ */
+ }
+ }
return 0;
}
-static int diff_tree(void *tree1, unsigned long size1, void *tree2, unsigned long size2, const char *base)
+static int diff_tree_commit_sha1(const unsigned char *sha1)
{
- while (size1 | size2) {
- if (!size1) {
- show_file("+", tree2, size2, base);
- update_tree_entry(&tree2, &size2);
- continue;
- }
- if (!size2) {
- show_file("-", tree1, size1, base);
- update_tree_entry(&tree1, &size1);
- continue;
+ struct commit *commit = lookup_commit_reference(sha1);
+ if (!commit)
+ return -1;
+ return diff_tree_commit(commit);
+}
+
+static int diff_tree_stdin(char *line)
+{
+ int len = strlen(line);
+ unsigned char sha1[20];
+ struct commit *commit;
+
+ if (!len || line[len-1] != '\n')
+ return -1;
+ line[len-1] = 0;
+ if (get_sha1_hex(line, sha1))
+ return -1;
+ commit = lookup_commit(sha1);
+ if (!commit || parse_commit(commit))
+ return -1;
+ if (isspace(line[40]) && !get_sha1_hex(line+41, sha1)) {
+ /* Graft the fake parents locally to the commit */
+ int pos = 41;
+ struct commit_list **pptr, *parents;
+
+ /* Free the real parent list */
+ for (parents = commit->parents; parents; ) {
+ struct commit_list *tmp = parents->next;
+ free(parents);
+ parents = tmp;
}
- switch (compare_tree_entry(tree1, size1, tree2, size2, base)) {
- case -1:
- update_tree_entry(&tree1, &size1);
- continue;
- case 0:
- update_tree_entry(&tree1, &size1);
- /* Fallthrough */
- case 1:
- update_tree_entry(&tree2, &size2);
- continue;
+ commit->parents = NULL;
+ pptr = &(commit->parents);
+ while (line[pos] && !get_sha1_hex(line + pos, sha1)) {
+ struct commit *parent = lookup_commit(sha1);
+ if (parent) {
+ pptr = &commit_list_insert(parent, pptr)->next;
+ }
+ pos += 41;
}
- die("diff-tree: internal error");
}
- return 0;
+ return diff_tree_commit(commit);
}
-static int diff_tree_sha1(const unsigned char *old, const unsigned char *new, const char *base)
+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"
+" --root include the initial commit as diff against /dev/null\n"
+COMMON_DIFF_OPTIONS_HELP;
+
+int main(int argc, const char **argv)
{
- void *tree1, *tree2;
- unsigned long size1, size2;
- char type[20];
- int retval;
+ int nr_sha1;
+ char line[1000];
+ unsigned char sha1[2][20];
+ const char *prefix = setup_git_directory();
- tree1 = read_sha1_file(old, type, &size1);
- if (!tree1 || strcmp(type, "tree"))
- die("unable to read source tree (%s)", sha1_to_hex(old));
- tree2 = read_sha1_file(new, type, &size2);
- if (!tree2 || strcmp(type, "tree"))
- die("unable to read destination tree (%s)", sha1_to_hex(new));
- retval = diff_tree(tree1, size1, tree2, size2, base);
- free(tree1);
- free(tree2);
- return retval;
-}
+ git_config(git_diff_config);
+ nr_sha1 = 0;
+ diff_setup(&diff_options);
-int main(int argc, char **argv)
-{
- unsigned char old[20], new[20];
+ for (;;) {
+ int diff_opt_cnt;
+ const char *arg;
- while (argc > 3) {
- char *arg = argv[1];
argv++;
argc--;
+ arg = *argv;
+ if (!arg)
+ break;
+
+ if (*arg != '-') {
+ if (nr_sha1 < 2 && !get_sha1(arg, sha1[nr_sha1])) {
+ nr_sha1++;
+ continue;
+ }
+ break;
+ }
+
+ diff_opt_cnt = diff_opt_parse(&diff_options, argv, argc);
+ if (diff_opt_cnt < 0)
+ usage(diff_tree_usage);
+ else if (diff_opt_cnt) {
+ argv += diff_opt_cnt - 1;
+ argc -= diff_opt_cnt - 1;
+ continue;
+ }
+
+
+ if (!strcmp(arg, "--")) {
+ argv++;
+ argc--;
+ break;
+ }
if (!strcmp(arg, "-r")) {
- recursive = 1;
+ diff_options.recursive = 1;
+ continue;
+ }
+ if (!strcmp(arg, "-t")) {
+ diff_options.recursive = 1;
+ diff_options.tree_in_recursive = 1;
+ continue;
+ }
+ if (!strcmp(arg, "-m")) {
+ ignore_merges = 0;
+ continue;
+ }
+ if (!strcmp(arg, "-c")) {
+ combine_merges = 1;
+ continue;
+ }
+ if (!strcmp(arg, "--cc")) {
+ dense_combined_merges = combine_merges = 1;
+ continue;
+ }
+ if (!strcmp(arg, "-v")) {
+ verbose_header = 1;
+ header_prefix = "diff-tree ";
continue;
}
- usage("diff-tree [-R] <tree sha1> <tree sha1>");
+ if (!strncmp(arg, "--pretty", 8)) {
+ verbose_header = 1;
+ header_prefix = "diff-tree ";
+ commit_format = get_commit_format(arg+8);
+ continue;
+ }
+ if (!strcmp(arg, "--stdin")) {
+ read_stdin = 1;
+ continue;
+ }
+ if (!strcmp(arg, "--root")) {
+ show_root_diff = 1;
+ continue;
+ }
+ if (!strcmp(arg, "--no-commit-id")) {
+ no_commit_id = 1;
+ continue;
+ }
+ if (!strcmp(arg, "--always")) {
+ always_show_header = 1;
+ continue;
+ }
+ usage(diff_tree_usage);
}
- if (argc != 3 || get_sha1_hex(argv[1], old) || get_sha1_hex(argv[2], new))
- usage("diff-tree <tree sha1> <tree sha1>");
- return diff_tree_sha1(old, new, "");
+ if (combine_merges)
+ ignore_merges = 0;
+
+ /* We can only do dense combined merges with diff output */
+ if (dense_combined_merges)
+ diff_options.output_format = DIFF_FORMAT_PATCH;
+
+ if (diff_options.output_format == DIFF_FORMAT_PATCH)
+ diff_options.recursive = 1;
+
+ diff_tree_setup_paths(get_pathspec(prefix, argv));
+ diff_setup_done(&diff_options);
+
+ switch (nr_sha1) {
+ case 0:
+ if (!read_stdin)
+ usage(diff_tree_usage);
+ break;
+ case 1:
+ diff_tree_commit_sha1(sha1[0]);
+ break;
+ case 2:
+ diff_tree_sha1_top(sha1[0], sha1[1], "");
+ break;
+ }
+
+ if (!read_stdin)
+ return 0;
+
+ if (diff_options.detect_rename)
+ diff_options.setup |= (DIFF_SETUP_USE_SIZE_CACHE |
+ DIFF_SETUP_USE_CACHE);
+ while (fgets(line, sizeof(line), stdin))
+ diff_tree_stdin(line);
+
+ return 0;
}