1
0
Fork 0
mirror of https://github.com/git/git.git synced 2024-10-30 13:57:54 +01:00
git/diff-tree.c
Linus Torvalds d288a70030 [PATCH] Make "git diff" work inside relative subdirectories
We always show the diff as an absolute path, but pathnames to diff are
taken relative to the current working directory (and if no pathnames are
given, the default ends up being all of the current working directory).

Note that "../xyz" also works, so you can do

	cd linux/drivers/char
	git diff ../block

and it will generate a diff of the linux/drivers/block changes.

Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Signed-off-by: Junio C Hamano <junkio@cox.net>
2005-08-16 18:47:22 -07:00

568 lines
13 KiB
C

#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 int count_paths(const char **paths)
{
int i = 0;
while (*paths++)
i++;
return i;
}
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, char **argv)
{
int nr_sha1;
char line[1000];
unsigned char sha1[2][20];
const char *prefix = setup_git_directory();
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);
paths = get_pathspec(prefix, argv);
if (paths) {
int i;
nr_paths = count_paths(paths);
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;
}