mirror of
https://github.com/git/git
synced 2024-07-17 02:57:48 +00:00
468 lines
10 KiB
C
468 lines
10 KiB
C
#include <ctype.h>
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#include "cache.h"
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#include "diff.h"
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static int silent = 0;
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static int verbose_header = 0;
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static int ignore_merges = 1;
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static int recursive = 0;
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static int read_stdin = 0;
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static int line_termination = '\n';
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static int generate_patch = 0;
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static const char *header = NULL;
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static const char *header_prefix = "";
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// What paths are we interested in?
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static int nr_paths = 0;
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static char **paths = NULL;
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static int *pathlens = NULL;
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static int diff_tree_sha1(const unsigned char *old, const unsigned char *new, const char *base);
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static void update_tree_entry(void **bufp, unsigned long *sizep)
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{
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void *buf = *bufp;
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unsigned long size = *sizep;
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int len = strlen(buf) + 1 + 20;
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if (size < len)
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die("corrupt tree file");
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*bufp = buf + len;
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*sizep = size - len;
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}
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static const unsigned char *extract(void *tree, unsigned long size, const char **pathp, unsigned int *modep)
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{
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int len = strlen(tree)+1;
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const unsigned char *sha1 = tree + len;
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const char *path = strchr(tree, ' ');
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if (!path || size < len + 20 || sscanf(tree, "%o", modep) != 1)
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die("corrupt tree file");
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*pathp = path+1;
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return sha1;
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}
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static char *malloc_base(const char *base, const char *path, int pathlen)
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{
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int baselen = strlen(base);
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char *newbase = xmalloc(baselen + pathlen + 2);
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memcpy(newbase, base, baselen);
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memcpy(newbase + baselen, path, pathlen);
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memcpy(newbase + baselen + pathlen, "/", 2);
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return newbase;
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}
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static void show_file(const char *prefix, void *tree, unsigned long size, const char *base);
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/* A whole sub-tree went away or appeared */
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static void show_tree(const char *prefix, void *tree, unsigned long size, const char *base)
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{
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while (size) {
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show_file(prefix, tree, size, base);
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update_tree_entry(&tree, &size);
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}
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}
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/* A file entry went away or appeared */
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static void show_file(const char *prefix, void *tree, unsigned long size, const char *base)
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{
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unsigned mode;
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const char *path;
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const unsigned char *sha1 = extract(tree, size, &path, &mode);
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if (header) {
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printf("%s", header);
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header = NULL;
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}
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if (silent)
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return;
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if (recursive && S_ISDIR(mode)) {
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char type[20];
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unsigned long size;
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char *newbase = malloc_base(base, path, strlen(path));
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void *tree;
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tree = read_sha1_file(sha1, type, &size);
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if (!tree || strcmp(type, "tree"))
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die("corrupt tree sha %s", sha1_to_hex(sha1));
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show_tree(prefix, tree, size, newbase);
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free(tree);
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free(newbase);
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return;
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}
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if (generate_patch) {
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if (!S_ISDIR(mode))
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diff_addremove(prefix[0], mode, sha1, base, path);
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}
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else
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printf("%s%06o\t%s\t%s\t%s%s%c", prefix, mode,
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S_ISDIR(mode) ? "tree" : "blob",
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sha1_to_hex(sha1), base, path,
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line_termination);
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}
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static int compare_tree_entry(void *tree1, unsigned long size1, void *tree2, unsigned long size2, const char *base)
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{
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unsigned mode1, mode2;
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const char *path1, *path2;
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const unsigned char *sha1, *sha2;
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int cmp, pathlen1, pathlen2;
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char old_sha1_hex[50];
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sha1 = extract(tree1, size1, &path1, &mode1);
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sha2 = extract(tree2, size2, &path2, &mode2);
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pathlen1 = strlen(path1);
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pathlen2 = strlen(path2);
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cmp = cache_name_compare(path1, pathlen1, path2, pathlen2);
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if (cmp < 0) {
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show_file("-", tree1, size1, base);
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return -1;
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}
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if (cmp > 0) {
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show_file("+", tree2, size2, base);
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return 1;
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}
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if (!memcmp(sha1, sha2, 20) && mode1 == mode2)
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return 0;
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/*
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* If the filemode has changed to/from a directory from/to a regular
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* file, we need to consider it a remove and an add.
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*/
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if (S_ISDIR(mode1) != S_ISDIR(mode2)) {
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show_file("-", tree1, size1, base);
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show_file("+", tree2, size2, base);
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return 0;
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}
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if (recursive && S_ISDIR(mode1)) {
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int retval;
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char *newbase = malloc_base(base, path1, pathlen1);
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retval = diff_tree_sha1(sha1, sha2, newbase);
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free(newbase);
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return retval;
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}
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if (header) {
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printf("%s", header);
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header = NULL;
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}
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if (silent)
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return 0;
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if (generate_patch) {
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if (!S_ISDIR(mode1))
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diff_change(mode1, mode2, sha1, sha2, base, path1);
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}
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else {
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strcpy(old_sha1_hex, sha1_to_hex(sha1));
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printf("*%06o->%06o\t%s\t%s->%s\t%s%s%c", mode1, mode2,
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S_ISDIR(mode1) ? "tree" : "blob",
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old_sha1_hex, sha1_to_hex(sha2), base, path1,
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line_termination);
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}
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return 0;
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}
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static int interesting(void *tree, unsigned long size, const char *base)
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{
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const char *path;
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unsigned mode;
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int i;
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int baselen, pathlen;
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if (!nr_paths)
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return 1;
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(void)extract(tree, size, &path, &mode);
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pathlen = strlen(path);
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baselen = strlen(base);
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for (i=0; i < nr_paths; i++) {
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const char *match = paths[i];
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int matchlen = pathlens[i];
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if (baselen >= matchlen) {
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/* If it doesn't match, move along... */
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if (strncmp(base, match, matchlen))
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continue;
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/* The base is a subdirectory of a path which was specified. */
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return 1;
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}
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/* Does the base match? */
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if (strncmp(base, match, baselen))
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continue;
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match += baselen;
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matchlen -= baselen;
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if (pathlen > matchlen)
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continue;
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if (strncmp(path, match, pathlen))
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continue;
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return 1;
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}
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return 0; /* No matches */
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}
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static int diff_tree(void *tree1, unsigned long size1, void *tree2, unsigned long size2, const char *base)
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{
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while (size1 | size2) {
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if (nr_paths && size1 && !interesting(tree1, size1, base)) {
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update_tree_entry(&tree1, &size1);
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continue;
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}
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if (nr_paths && size2 && !interesting(tree2, size2, base)) {
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update_tree_entry(&tree2, &size2);
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continue;
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}
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if (!size1) {
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show_file("+", tree2, size2, base);
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update_tree_entry(&tree2, &size2);
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continue;
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}
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if (!size2) {
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show_file("-", tree1, size1, base);
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update_tree_entry(&tree1, &size1);
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continue;
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}
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switch (compare_tree_entry(tree1, size1, tree2, size2, base)) {
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case -1:
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update_tree_entry(&tree1, &size1);
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continue;
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case 0:
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update_tree_entry(&tree1, &size1);
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/* Fallthrough */
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case 1:
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update_tree_entry(&tree2, &size2);
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continue;
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}
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die("diff-tree: internal error");
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}
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return 0;
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}
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static int diff_tree_sha1(const unsigned char *old, const unsigned char *new, const char *base)
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{
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void *tree1, *tree2;
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unsigned long size1, size2;
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int retval;
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tree1 = read_object_with_reference(old, "tree", &size1, 0);
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if (!tree1)
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die("unable to read source tree (%s)", sha1_to_hex(old));
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tree2 = read_object_with_reference(new, "tree", &size2, 0);
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if (!tree2)
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die("unable to read destination tree (%s)", sha1_to_hex(new));
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retval = diff_tree(tree1, size1, tree2, size2, base);
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free(tree1);
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free(tree2);
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return retval;
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}
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static int get_one_line(const char *msg, unsigned long len)
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{
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int ret = 0;
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while (len--) {
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ret++;
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if (*msg++ == '\n')
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break;
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}
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return ret;
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}
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static int add_author_info(char *buf, const char *line, int len)
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{
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char *date;
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unsigned int namelen;
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unsigned long time;
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int tz;
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line += strlen("author ");
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date = strchr(line, '>');
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if (!date)
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return 0;
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namelen = ++date - line;
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time = strtoul(date, &date, 10);
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tz = strtol(date, NULL, 10);
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return sprintf(buf, "Author: %.*s\nDate: %s\n",
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namelen, line,
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show_date(time, tz));
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}
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static char *generate_header(const char *commit, const char *parent, const char *msg, unsigned long len)
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{
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static char this_header[1000];
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int offset;
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offset = sprintf(this_header, "%s%s (from %s)\n", header_prefix, commit, parent);
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if (verbose_header) {
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int hdr = 1;
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for (;;) {
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const char *line = msg;
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int linelen = get_one_line(msg, len);
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if (!linelen)
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break;
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if (offset + linelen + 10 > sizeof(this_header))
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break;
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msg += linelen;
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len -= linelen;
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if (linelen == 1)
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hdr = 0;
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if (hdr) {
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if (!memcmp(line, "author ", 7))
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offset += add_author_info(this_header + offset, line, linelen);
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continue;
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}
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memset(this_header + offset, ' ', 4);
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memcpy(this_header + offset + 4, line, linelen);
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offset += linelen + 4;
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}
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this_header[offset++] = '\n';
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this_header[offset] = 0;
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}
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return this_header;
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}
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static int diff_tree_stdin(char *line)
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{
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int len = strlen(line);
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unsigned char commit[20], parent[20];
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unsigned long size, offset;
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static char this_header[1000];
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char *buf;
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if (!len || line[len-1] != '\n')
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return -1;
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line[len-1] = 0;
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if (get_sha1_hex(line, commit))
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return -1;
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if (isspace(line[40]) && !get_sha1_hex(line+41, parent)) {
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line[40] = 0;
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line[81] = 0;
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sprintf(this_header, "%s (from %s)\n", line, line+41);
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header = this_header;
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return diff_tree_sha1(parent, commit, "");
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}
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buf = read_object_with_reference(commit, "commit", &size, NULL);
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if (!buf)
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return -1;
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/* More than one parent? */
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if (ignore_merges) {
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if (!memcmp(buf + 46 + 48, "parent ", 7))
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return 0;
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}
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line[40] = 0;
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offset = 46;
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while (offset + 48 < size && !memcmp(buf + offset, "parent ", 7)) {
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if (get_sha1_hex(buf + offset + 7, parent))
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return -1;
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header = generate_header(line, sha1_to_hex(parent), buf, size);
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diff_tree_sha1(parent, commit, "");
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if (!header && verbose_header)
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header_prefix = "\ndiff-tree ";
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offset += 48;
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}
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return -1;
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}
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static char *diff_tree_usage =
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"diff-tree [-p] [-r] [-z] [--stdin] [-m] [-s] [-v] <tree sha1> <tree sha1>";
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int main(int argc, char **argv)
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{
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char line[1000];
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unsigned char old[20], new[20];
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for (;;) {
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char *arg;
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argv++;
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argc--;
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arg = *argv;
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if (!arg || *arg != '-')
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break;
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if (!strcmp(arg, "-")) {
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argv++;
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argc--;
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break;
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}
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if (!strcmp(arg, "-r")) {
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recursive = 1;
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continue;
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}
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if (!strcmp(arg, "-p")) {
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recursive = generate_patch = 1;
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continue;
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}
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if (!strcmp(arg, "-z")) {
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line_termination = '\0';
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continue;
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}
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if (!strcmp(arg, "-m")) {
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ignore_merges = 0;
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continue;
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}
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if (!strcmp(arg, "-s")) {
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silent = 1;
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continue;
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}
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if (!strcmp(arg, "-v")) {
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verbose_header = 1;
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header_prefix = "diff-tree ";
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continue;
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}
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if (!strcmp(arg, "--stdin")) {
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read_stdin = 1;
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continue;
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}
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usage(diff_tree_usage);
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}
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if (!read_stdin) {
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if (argc < 2 || get_sha1(argv[0], old) || get_sha1(argv[1], new))
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usage(diff_tree_usage);
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argv += 2;
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argc -= 2;
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}
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if (argc > 0) {
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int i;
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paths = argv;
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nr_paths = argc;
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pathlens = xmalloc(nr_paths * sizeof(int));
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for (i=0; i<nr_paths; i++)
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pathlens[i] = strlen(paths[i]);
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}
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if (!read_stdin)
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return diff_tree_sha1(old, new, "");
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while (fgets(line, sizeof(line), stdin))
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diff_tree_stdin(line);
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return 0;
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}
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