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-rw-r--r--diff-tree.c559
1 files changed, 559 insertions, 0 deletions
diff --git a/diff-tree.c b/diff-tree.c
new file mode 100644
index 0000000000..0dd3cdacb2
--- /dev/null
+++ b/diff-tree.c
@@ -0,0 +1,559 @@
+#include <ctype.h>
+#include "cache.h"
+#include "diff.h"
+#include "commit.h"
+
+static int show_root_diff = 0;
+static int verbose_header = 0;
+static int ignore_merges = 1;
+static int recursive = 0;
+static int show_tree_entry_in_recursive = 0;
+static int read_stdin = 0;
+static int diff_output_format = DIFF_FORMAT_RAW;
+static int diff_line_termination = '\n';
+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;
+static const char *header = NULL;
+static const char *header_prefix = "";
+static enum cmit_fmt commit_format = CMIT_FMT_RAW;
+
+// What paths are we interested in?
+static int nr_paths = 0;
+static const char **paths = NULL;
+static int *pathlens = NULL;
+
+static int diff_tree_sha1(const unsigned char *old, const unsigned char *new, const char *base);
+
+static void update_tree_entry(void **bufp, unsigned long *sizep)
+{
+ 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;
+}
+
+static const unsigned char *extract(void *tree, unsigned long size, const char **pathp, unsigned int *modep)
+{
+ int len = strlen(tree)+1;
+ const unsigned char *sha1 = tree + len;
+ const char *path = strchr(tree, ' ');
+ unsigned int mode;
+
+ if (!path || size < len + 20 || sscanf(tree, "%o", &mode) != 1)
+ die("corrupt tree file");
+ *pathp = path+1;
+ *modep = DIFF_FILE_CANON_MODE(mode);
+ return sha1;
+}
+
+static char *malloc_base(const char *base, const char *path, int pathlen)
+{
+ 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;
+}
+
+static void show_file(const char *prefix, void *tree, unsigned long size, const char *base);
+static void show_tree(const char *prefix, void *tree, unsigned long size, const char *base);
+
+/* A file entry went away or appeared */
+static void show_file(const char *prefix, void *tree, unsigned long size, const char *base)
+{
+ 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;
+ }
+
+ diff_addremove(prefix[0], mode, sha1, base, path);
+}
+
+static int compare_tree_entry(void *tree1, unsigned long size1, void *tree2, unsigned long size2, const char *base)
+{
+ unsigned mode1, mode2;
+ const char *path1, *path2;
+ const unsigned char *sha1, *sha2;
+ int cmp, pathlen1, pathlen2;
+
+ sha1 = extract(tree1, size1, &path1, &mode1);
+ sha2 = extract(tree2, size2, &path2, &mode2);
+
+ pathlen1 = strlen(path1);
+ pathlen2 = strlen(path2);
+ cmp = base_name_compare(path1, pathlen1, mode1, path2, pathlen2, mode2);
+ if (cmp < 0) {
+ show_file("-", tree1, size1, base);
+ return -1;
+ }
+ if (cmp > 0) {
+ show_file("+", tree2, size2, base);
+ return 1;
+ }
+ if (!find_copies_harder && !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 (recursive && S_ISDIR(mode1)) {
+ int retval;
+ char *newbase = malloc_base(base, path1, pathlen1);
+ if (show_tree_entry_in_recursive)
+ diff_change(mode1, mode2, sha1, sha2, base, path1);
+ retval = diff_tree_sha1(sha1, sha2, newbase);
+ free(newbase);
+ return retval;
+ }
+
+ diff_change(mode1, mode2, sha1, sha2, base, path1);
+ return 0;
+}
+
+static int interesting(void *tree, unsigned long size, const char *base)
+{
+ const char *path;
+ unsigned mode;
+ int i;
+ int baselen, pathlen;
+
+ if (!nr_paths)
+ return 1;
+
+ (void)extract(tree, size, &path, &mode);
+
+ pathlen = strlen(path);
+ baselen = strlen(base);
+
+ for (i=0; i < nr_paths; i++) {
+ const char *match = paths[i];
+ int matchlen = pathlens[i];
+
+ if (baselen >= matchlen) {
+ /* If it doesn't match, move along... */
+ if (strncmp(base, match, matchlen))
+ continue;
+
+ /* The base is a subdirectory of a path which was specified. */
+ return 1;
+ }
+
+ /* Does the base match? */
+ if (strncmp(base, match, baselen))
+ continue;
+
+ match += baselen;
+ matchlen -= baselen;
+
+ if (pathlen > matchlen)
+ continue;
+
+ if (matchlen > pathlen) {
+ if (match[pathlen] != '/')
+ continue;
+ if (!S_ISDIR(mode))
+ continue;
+ }
+
+ if (strncmp(path, match, pathlen))
+ continue;
+
+ return 1;
+ }
+ return 0; /* No matches */
+}
+
+/* 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) {
+ if (interesting(tree, size, base))
+ show_file(prefix, tree, size, base);
+ update_tree_entry(&tree, &size);
+ }
+}
+
+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 (nr_paths && size2 && !interesting(tree2, size2, base)) {
+ update_tree_entry(&tree2, &size2);
+ continue;
+ }
+ 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;
+ }
+ 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;
+ }
+ die("git-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_object_with_reference(old, "tree", &size1, NULL);
+ if (!tree1)
+ die("unable to read source tree (%s)", sha1_to_hex(old));
+ tree2 = read_object_with_reference(new, "tree", &size2, NULL);
+ 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 void call_diff_setup(void)
+{
+ diff_setup(diff_setup_opt);
+}
+
+static int call_diff_flush(void)
+{
+ diffcore_std(NULL,
+ detect_rename, diff_score_opt,
+ pickaxe, pickaxe_opts,
+ diff_break_opt,
+ orderfile,
+ diff_filter);
+ if (diff_queue_is_empty()) {
+ diff_flush(DIFF_FORMAT_NO_OUTPUT, diff_line_termination);
+ return 0;
+ }
+ if (header) {
+ printf("%s%c", header, diff_line_termination);
+ header = NULL;
+ }
+ diff_flush(diff_output_format, diff_line_termination);
+ return 1;
+}
+
+static int diff_tree_sha1_top(const unsigned char *old,
+ const unsigned char *new, const char *base)
+{
+ int ret;
+
+ call_diff_setup();
+ ret = diff_tree_sha1(old, new, base);
+ call_diff_flush();
+ return ret;
+}
+
+static int diff_root_tree(const unsigned char *new, const char *base)
+{
+ int retval;
+ void *tree;
+ unsigned long size;
+
+ call_diff_setup();
+ tree = read_object_with_reference(new, "tree", &size, NULL);
+ if (!tree)
+ die("unable to read root tree (%s)", sha1_to_hex(new));
+ retval = diff_tree("", 0, tree, size, base);
+ free(tree);
+ call_diff_flush();
+ return retval;
+}
+
+static const char *generate_header(const char *commit, const char *parent, const char *msg, unsigned long len)
+{
+ static char this_header[16384];
+ int offset;
+
+ 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 diff_tree_commit(const unsigned char *commit, const char *name)
+{
+ unsigned long size, offset;
+ char *buf = read_object_with_reference(commit, "commit", &size, NULL);
+
+ if (!buf)
+ return -1;
+
+ if (!name) {
+ static char commit_name[60];
+ strcpy(commit_name, sha1_to_hex(commit));
+ name = commit_name;
+ }
+
+ /* Root commit? */
+ if (show_root_diff && memcmp(buf + 46, "parent ", 7)) {
+ header = generate_header(name, "root", buf, size);
+ diff_root_tree(commit, "");
+ }
+
+ /* More than one parent? */
+ if (ignore_merges) {
+ if (!memcmp(buf + 46 + 48, "parent ", 7))
+ return 0;
+ }
+
+ 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;
+ }
+ return 0;
+}
+
+static int diff_tree_stdin(char *line)
+{
+ int len = strlen(line);
+ unsigned char commit[20], parent[20];
+ static char this_header[1000];
+
+ 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);
+}
+
+static const char diff_tree_usage[] =
+"git-diff-tree [--stdin] [-m] [-s] [-v] [--pretty] [-t] "
+"[<common diff options>] <tree-ish> <tree-ish>"
+COMMON_DIFF_OPTIONS_HELP;
+
+int main(int argc, const char **argv)
+{
+ int nr_sha1;
+ char line[1000];
+ unsigned char sha1[2][20];
+
+ nr_sha1 = 0;
+ for (;;) {
+ const char *arg;
+
+ argv++;
+ argc--;
+ arg = *argv;
+ if (!arg)
+ break;
+
+ if (*arg != '-') {
+ if (nr_sha1 < 2 && !get_sha1(arg, sha1[nr_sha1])) {
+ nr_sha1++;
+ continue;
+ }
+ break;
+ }
+
+ if (!strcmp(arg, "--")) {
+ argv++;
+ argc--;
+ break;
+ }
+ if (!strcmp(arg, "-r")) {
+ recursive = 1;
+ continue;
+ }
+ if (!strcmp(arg, "-t")) {
+ recursive = show_tree_entry_in_recursive = 1;
+ continue;
+ }
+ if (!strcmp(arg, "-R")) {
+ diff_setup_opt |= DIFF_SETUP_REVERSE;
+ continue;
+ }
+ if (!strcmp(arg, "-p") || !strcmp(arg, "-u")) {
+ diff_output_format = DIFF_FORMAT_PATCH;
+ recursive = 1;
+ continue;
+ }
+ if (!strncmp(arg, "-S", 2)) {
+ pickaxe = arg + 2;
+ continue;
+ }
+ if (!strncmp(arg, "-O", 2)) {
+ orderfile = arg + 2;
+ continue;
+ }
+ if (!strncmp(arg, "--diff-filter=", 14)) {
+ diff_filter = arg + 14;
+ continue;
+ }
+ if (!strcmp(arg, "--pickaxe-all")) {
+ pickaxe_opts = DIFF_PICKAXE_ALL;
+ continue;
+ }
+ if (!strncmp(arg, "-M", 2)) {
+ detect_rename = DIFF_DETECT_RENAME;
+ if ((diff_score_opt = diff_scoreopt_parse(arg)) == -1)
+ usage(diff_tree_usage);
+ continue;
+ }
+ if (!strncmp(arg, "-C", 2)) {
+ detect_rename = DIFF_DETECT_COPY;
+ if ((diff_score_opt = diff_scoreopt_parse(arg)) == -1)
+ usage(diff_tree_usage);
+ continue;
+ }
+ if (!strncmp(arg, "-B", 2)) {
+ if ((diff_break_opt = diff_scoreopt_parse(arg)) == -1)
+ usage(diff_tree_usage);
+ continue;
+ }
+ if (!strcmp(arg, "--find-copies-harder")) {
+ find_copies_harder = 1;
+ continue;
+ }
+ if (!strcmp(arg, "--name-only")) {
+ diff_output_format = DIFF_FORMAT_NAME;
+ continue;
+ }
+ if (!strcmp(arg, "-z")) {
+ diff_line_termination = 0;
+ continue;
+ }
+ if (!strcmp(arg, "-m")) {
+ ignore_merges = 0;
+ continue;
+ }
+ if (!strcmp(arg, "-s")) {
+ diff_output_format = DIFF_FORMAT_NO_OUTPUT;
+ continue;
+ }
+ if (!strcmp(arg, "-v")) {
+ verbose_header = 1;
+ header_prefix = "diff-tree ";
+ continue;
+ }
+ 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;
+ }
+ usage(diff_tree_usage);
+ }
+ if (find_copies_harder && detect_rename != DIFF_DETECT_COPY)
+ usage(diff_tree_usage);
+
+ if (argc > 0) {
+ int i;
+
+ paths = argv;
+ nr_paths = argc;
+ pathlens = xmalloc(nr_paths * sizeof(int));
+ for (i=0; i<nr_paths; i++)
+ pathlens[i] = strlen(paths[i]);
+ }
+
+ 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 (!read_stdin)
+ return 0;
+
+ if (detect_rename)
+ diff_setup_opt |= (DIFF_SETUP_USE_SIZE_CACHE |
+ DIFF_SETUP_USE_CACHE);
+ while (fgets(line, sizeof(line), stdin))
+ diff_tree_stdin(line);
+
+ return 0;
+}
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-08 04:02:20 +0000