#include "cache.h"
#include "diff.h"
+#include "commit.h"
-static int recursive = 0;
-static int line_termination = '\n';
-static int generate_patch = 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 read_stdin = 0;
-// What paths are we interested in?
-static int nr_paths = 0;
-static char **paths = NULL;
-static int *pathlens = NULL;
+static const char *header = NULL;
+static const char *header_prefix = "";
+static enum cmit_fmt commit_format = CMIT_FMT_RAW;
-static int diff_tree_sha1(const unsigned char *old, const unsigned char *new, const char *base);
+static struct diff_options diff_options;
-static void update_tree_entry(void **bufp, unsigned long *sizep)
+static void call_diff_setup_done(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;
+ diff_setup_done(&diff_options);
}
-static const unsigned char *extract(void *tree, unsigned long size, const char **pathp, unsigned int *modep)
+static int call_diff_flush(void)
{
- 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;
+ 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 char *malloc_base(const char *base, const char *path, int pathlen)
+static int diff_tree_sha1_top(const unsigned char *old,
+ const unsigned char *new, const char *base)
{
- int baselen = strlen(base);
- char *newbase = xmalloc(baselen + pathlen + 2);
- memcpy(newbase, base, baselen);
- memcpy(newbase + baselen, path, pathlen);
- memcpy(newbase + baselen + pathlen, "/", 2);
- return newbase;
-}
+ int ret;
-static void show_file(const char *prefix, void *tree, unsigned long size, const char *base);
+ call_diff_setup_done();
+ ret = diff_tree_sha1(old, new, base, &diff_options);
+ call_diff_flush();
+ return ret;
+}
-/* A whole sub-tree went away or appeared */
-static void show_tree(const char *prefix, void *tree, unsigned long size, const char *base)
+static int diff_root_tree(const unsigned char *new, const char *base)
{
- while (size) {
- show_file(prefix, tree, size, base);
- update_tree_entry(&tree, &size);
- }
+ int retval;
+ void *tree;
+ struct tree_desc empty, real;
+
+ call_diff_setup_done();
+ 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;
+
+ 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 char *commit, const char *parent, const char *msg, unsigned long len)
{
- 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;
- if (generate_patch) {
- if (!S_ISDIR(mode))
- diff_addremove(prefix[0], mode, sha1, base, path);
- }
- else
- printf("%s%06o\t%s\t%s\t%s%s%c", prefix, mode,
- S_ISDIR(mode) ? "tree" : "blob",
- sha1_to_hex(sha1), base, path,
- line_termination);
+ if (!verbose_header)
+ return commit;
+
+ offset = sprintf(this_header, "%s%s (from %s)\n", header_prefix, commit, parent);
+ offset += pretty_print_commit(commit_format, msg, len, this_header + offset, sizeof(this_header) - offset);
+ 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(const unsigned char *commit, const char *name)
{
- 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);
+ unsigned long size, offset;
+ char *buf = read_object_with_reference(commit, "commit", &size, NULL);
+
+ if (!buf)
return -1;
- }
- if (cmp > 0) {
- show_file("+", tree2, size2, base);
- return 1;
- }
- if (!memcmp(sha1, sha2, 20) && mode1 == mode2)
- return 0;
- /*
- * 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;
+ if (!name) {
+ static char commit_name[60];
+ strcpy(commit_name, sha1_to_hex(commit));
+ name = commit_name;
}
- 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;
+ /* Root commit? */
+ if (show_root_diff && memcmp(buf + 46, "parent ", 7)) {
+ header = generate_header(name, "root", buf, size);
+ diff_root_tree(commit, "");
}
- if (generate_patch) {
- if (!S_ISDIR(mode1))
- diff_change(mode1, mode2, sha1, sha2, base, path1);
+ /* More than one parent? */
+ if (ignore_merges) {
+ if (!memcmp(buf + 46 + 48, "parent ", 7))
+ return 0;
}
- else {
- strcpy(old_sha1_hex, sha1_to_hex(sha1));
- printf("*%06o->%06o\t%s\t%s->%s\t%s%s%c", mode1, mode2,
- S_ISDIR(mode1) ? "tree" : "blob",
- old_sha1_hex, sha1_to_hex(sha2), base, path1,
- line_termination);
+
+ offset = 46;
+ while (offset + 48 < size && !memcmp(buf + offset, "parent ", 7)) {
+ unsigned char parent[20];
+ if (get_sha1_hex(buf + offset + 7, parent))
+ return -1;
+ header = generate_header(name, sha1_to_hex(parent), buf, size);
+ diff_tree_sha1_top(parent, commit, "");
+ if (!header && verbose_header) {
+ header_prefix = "\ndiff-tree ";
+ /*
+ * Don't print multiple merge entries if we
+ * don't print the diffs.
+ */
+ }
+ offset += 48;
}
+ free(buf);
return 0;
}
-static int interesting(void *tree, unsigned long size, const char *base)
+static int diff_tree_stdin(char *line)
{
- const char *path;
- unsigned mode;
- int i;
- int baselen, pathlen;
+ int len = strlen(line);
+ unsigned char commit[20], parent[20];
+ static char this_header[1000];
- if (!nr_paths)
- return 1;
-
- (void)extract(tree, size, &path, &mode);
-
- pathlen = strlen(path);
- baselen = strlen(base);
+ if (!len || line[len-1] != '\n')
+ return -1;
+ line[len-1] = 0;
+ if (get_sha1_hex(line, commit))
+ return -1;
+ if (isspace(line[40]) && !get_sha1_hex(line+41, parent)) {
+ line[40] = 0;
+ line[81] = 0;
+ sprintf(this_header, "%s (from %s)\n", line, line+41);
+ header = this_header;
+ return diff_tree_sha1_top(parent, commit, "");
+ }
+ line[40] = 0;
+ return diff_tree_commit(commit, line);
+}
- for (i=0; i < nr_paths; i++) {
- const char *match = paths[i];
- int matchlen = pathlens[i];
+static const char diff_tree_usage[] =
+"git-diff-tree [--stdin] [-m] [-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;
- if (baselen >= matchlen) {
- /* If it doesn't match, move along... */
- if (strncmp(base, match, matchlen))
- continue;
+int main(int argc, const char **argv)
+{
+ int nr_sha1;
+ char line[1000];
+ unsigned char sha1[2][20];
+ const char *prefix = setup_git_directory();
- /* The base is a subdirectory of a path which was specified. */
- return 1;
- }
+ git_config(git_default_config);
+ nr_sha1 = 0;
+ diff_setup(&diff_options);
- /* Does the base match? */
- if (strncmp(base, match, baselen))
- continue;
+ for (;;) {
+ int diff_opt_cnt;
+ const char *arg;
- match += baselen;
- matchlen -= baselen;
+ argv++;
+ argc--;
+ arg = *argv;
+ if (!arg)
+ break;
- if (pathlen > matchlen)
- continue;
+ if (*arg != '-') {
+ if (nr_sha1 < 2 && !get_sha1(arg, sha1[nr_sha1])) {
+ nr_sha1++;
+ continue;
+ }
+ break;
+ }
- if (strncmp(path, match, pathlen))
+ 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;
+ }
- return 1;
- }
- return 0; /* No matches */
-}
-static int diff_tree(void *tree1, unsigned long size1, void *tree2, unsigned long size2, const char *base)
-{
- while (size1 | size2) {
- if (nr_paths && size1 && !interesting(tree1, size1, base)) {
- update_tree_entry(&tree1, &size1);
- continue;
+ if (!strcmp(arg, "--")) {
+ argv++;
+ argc--;
+ break;
}
- if (nr_paths && size2 && !interesting(tree2, size2, base)) {
- update_tree_entry(&tree2, &size2);
+ if (!strcmp(arg, "-r")) {
+ diff_options.recursive = 1;
continue;
}
- if (!size1) {
- show_file("+", tree2, size2, base);
- update_tree_entry(&tree2, &size2);
+ if (!strcmp(arg, "-t")) {
+ diff_options.recursive = 1;
+ diff_options.tree_in_recursive = 1;
continue;
}
- if (!size2) {
- show_file("-", tree1, size1, base);
- update_tree_entry(&tree1, &size1);
+ if (!strcmp(arg, "-m")) {
+ ignore_merges = 0;
continue;
}
- switch (compare_tree_entry(tree1, size1, tree2, size2, base)) {
- case -1:
- update_tree_entry(&tree1, &size1);
+ if (!strcmp(arg, "-v")) {
+ verbose_header = 1;
+ header_prefix = "diff-tree ";
continue;
- case 0:
- update_tree_entry(&tree1, &size1);
- /* Fallthrough */
- case 1:
- update_tree_entry(&tree2, &size2);
+ }
+ if (!strncmp(arg, "--pretty", 8)) {
+ verbose_header = 1;
+ header_prefix = "diff-tree ";
+ commit_format = get_commit_format(arg+8);
continue;
}
- die("diff-tree: internal error");
- }
- return 0;
-}
-
-static int diff_tree_sha1(const unsigned char *old, const unsigned char *new, const char *base)
-{
- void *tree1, *tree2;
- unsigned long size1, size2;
- int retval;
-
- tree1 = read_tree_with_tree_or_commit_sha1(old, &size1, 0);
- if (!tree1)
- die("unable to read source tree (%s)", sha1_to_hex(old));
- tree2 = read_tree_with_tree_or_commit_sha1(new, &size2, 0);
- if (!tree2)
- 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;
-}
-
-static char *diff_tree_usage = "diff-tree [-r] [-z] <tree sha1> <tree sha1>";
-
-int main(int argc, char **argv)
-{
- unsigned char old[20], new[20];
-
- for (;;) {
- char *arg = argv[1];
-
- if (!arg || *arg != '-')
- break;
-
- argv++;
- argc--;
- if (!strcmp(arg, "-r")) {
- recursive = 1;
+ if (!strcmp(arg, "--stdin")) {
+ read_stdin = 1;
continue;
}
- if (!strcmp(arg, "-p")) {
- generate_patch = 1;
+ if (!strcmp(arg, "--root")) {
+ show_root_diff = 1;
continue;
}
- if (!strcmp(arg, "-z")) {
- line_termination = '\0';
+ if (!strcmp(arg, "--no-commit-id")) {
+ no_commit_id = 1;
continue;
}
usage(diff_tree_usage);
}
+ if (diff_options.output_format == DIFF_FORMAT_PATCH)
+ diff_options.recursive = 1;
+
+ diff_tree_setup_paths(get_pathspec(prefix, argv));
+
+ switch (nr_sha1) {
+ case 0:
+ if (!read_stdin)
+ usage(diff_tree_usage);
+ break;
+ case 1:
+ diff_tree_commit(sha1[0], NULL);
+ break;
+ case 2:
+ diff_tree_sha1_top(sha1[0], sha1[1], "");
+ break;
+ }
- if (argc < 3 || get_sha1_hex(argv[1], old) || get_sha1_hex(argv[2], new))
- usage(diff_tree_usage);
-
- if (argc > 3) {
- int i;
+ if (!read_stdin)
+ return 0;
- paths = &argv[3];
- nr_paths = argc - 3;
- pathlens = xmalloc(nr_paths * sizeof(int));
- for (i=0; i<nr_paths; i++)
- pathlens[i] = strlen(paths[i]);
- }
+ 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 diff_tree_sha1(old, new, "");
+ return 0;
}