Add "-R" flag to "diff-tree", so that it will recursively traverse a tree of trees

as it diffs them.

This makes diff-tree usable again in the new world order.

diff --git a/cache.h b/cache.h
index 1e006bf..4b10118 100644 (file)
--- a/cache.h
+++ b/cache.h
@@ -87,15 +87,15 @@ extern int cache_match_stat(struct cache_entry *ce, struct stat *st);
 #define DATA_CHANGED    0x0020
 
 /* Return a statically allocated filename matching the sha1 signature */
-extern char *sha1_file_name(unsigned char *sha1);
+extern char *sha1_file_name(const unsigned char *sha1);
 
 /* Write a memory buffer out to the sha file */
-extern int write_sha1_buffer(unsigned char *sha1, void *buf, unsigned int size);
+extern int write_sha1_buffer(const unsigned char *sha1, void *buf, unsigned int size);
 
 /* Read and unpack a sha1 file into memory, write memory to a sha1 file */
-extern void * map_sha1_file(unsigned char *sha1, unsigned long *size);
+extern void * map_sha1_file(const unsigned char *sha1, unsigned long *size);
 extern void * unpack_sha1_file(void *map, unsigned long mapsize, char *type, unsigned long *size);
-extern void * read_sha1_file(unsigned char *sha1, char *type, unsigned long *size);
+extern void * read_sha1_file(const unsigned char *sha1, char *type, unsigned long *size);
 extern int write_sha1_file(char *buf, unsigned len, unsigned char *return_sha1);
 extern int check_sha1_signature(unsigned char *sha1, void *buf, unsigned long size);
 

diff --git a/diff-tree.c b/diff-tree.c
index 2f04d1e..207617c 100644 (file)
--- a/diff-tree.c
+++ b/diff-tree.c
@@ -1,8 +1,10 @@
 #include "cache.h"
 
-struct tree_entry;
+static int recursive = 0;
 
-static struct tree_entry *update_tree_entry(void **bufp, unsigned long *sizep)
+static int diff_tree_sha1(const unsigned char *old, const unsigned char *new, const char *src, const char *dst);
+
+static void update_tree_entry(void **bufp, unsigned long *sizep)
 {
        void *buf = *bufp;
        unsigned long size = *sizep;
@@ -12,7 +14,6 @@ static struct tree_entry *update_tree_entry(void **bufp, unsigned long *sizep)
                usage("corrupt tree file");
        *bufp = buf + len;
        *sizep = size - len;
-       return buf;
 }
 
 static const unsigned char *extract(void *tree, unsigned long size, const char **pathp, unsigned int *modep)
@@ -27,54 +28,70 @@ static const unsigned char *extract(void *tree, unsigned long size, const char *
        return sha1;
 }
 
-static void show_file(const char *prefix, void *tree, unsigned long size)
+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);
-       printf("%s%o %s %s%c", prefix, mode, sha1_to_hex(sha1), path, 0);
+       printf("%s%o %s %s%s%c", prefix, mode, sha1_to_hex(sha1), base, path, 0);
 }
 
-static int compare_tree_entry(void *tree1, unsigned long size1, void *tree2, unsigned long size2)
+static int compare_tree_entry(void *tree1, unsigned long size1, void *tree2, unsigned long size2, const char *src, const char *dst)
 {
        unsigned mode1, mode2;
        const char *path1, *path2;
        const unsigned char *sha1, *sha2;
-       int cmp;
+       int cmp, pathlen1, pathlen2;
 
        sha1 = extract(tree1, size1, &path1, &mode1);
        sha2 = extract(tree2, size2, &path2, &mode2);
 
-       cmp = cache_name_compare(path1, strlen(path1), path2, strlen(path2));
+       pathlen1 = strlen(path1);
+       pathlen2 = strlen(path2);
+       cmp = cache_name_compare(path1, pathlen1, path2, pathlen2);
        if (cmp < 0) {
-               show_file("-", tree1, size1);
+               show_file("-", tree1, size1, src);
                return -1;
        }
        if (cmp > 0) {
-               show_file("+", tree2, size2);
+               show_file("+", tree2, size2, dst);
                return 1;
        }
        if (!memcmp(sha1, sha2, 20) && mode1 == mode2)
                return 0;
-       show_file("<", tree1, size1);
-       show_file(">", tree2, size2);
+       if (recursive && S_ISDIR(mode1) && S_ISDIR(mode2)) {
+               int srclen = strlen(src);
+               int dstlen = strlen(dst);
+               char *srcbase = malloc(srclen + pathlen1 + 2);
+               char *dstbase = malloc(srclen + pathlen1 + 2);
+               memcpy(srcbase, src, srclen);
+               memcpy(srcbase + srclen, path1, pathlen1);
+               memcpy(srcbase + srclen + pathlen1, "/", 2);
+               memcpy(dstbase, dst, dstlen);
+               memcpy(dstbase + dstlen, path2, pathlen2);
+               memcpy(dstbase + dstlen + pathlen2, "/", 2);
+               return diff_tree_sha1(sha1, sha2, srcbase, dstbase);
+       }
+
+       show_file("<", tree1, size1, src);
+       show_file(">", tree2, size2, dst);
        return 0;
 }
 
-static int diff_tree(void *tree1, unsigned long size1, void *tree2, unsigned long size2)
+static int diff_tree(void *tree1, unsigned long size1, void *tree2, unsigned long size2, const char *src, const char *dst)
 {
        while (size1 | size2) {
                if (!size1) {
-                       show_file("+", tree2, size2);
+                       show_file("+", tree2, size2, dst);
                        update_tree_entry(&tree2, &size2);
                        continue;
                }
                if (!size2) {
-                       show_file("-", tree1, size1);
+                       show_file("-", tree1, size1, src);
                        update_tree_entry(&tree1, &size1);
                        continue;
                }
-               switch (compare_tree_entry(tree1, size1, tree2, size2)) {
+               switch (compare_tree_entry(tree1, size1, tree2, size2, src, dst)) {
                case -1:
                        update_tree_entry(&tree1, &size1);
                        continue;
@@ -90,20 +107,41 @@ static int diff_tree(void *tree1, unsigned long size1, void *tree2, unsigned lon
        return 0;
 }
 
-int main(int argc, char **argv)
+static int diff_tree_sha1(const unsigned char *old, const unsigned char *new, const char *src, const char *dst)
 {
-       unsigned char old[20], new[20];
        void *tree1, *tree2;
        unsigned long size1, size2;
        char type[20];
+       int retval;
 
-       if (argc != 3 || get_sha1_hex(argv[1], old) || get_sha1_hex(argv[2], new))
-               usage("diff-tree <tree sha1> <tree sha1>");
        tree1 = read_sha1_file(old, type, &size1);
        if (!tree1 || strcmp(type, "tree"))
                usage("unable to read source tree");
        tree2 = read_sha1_file(new, type, &size2);
        if (!tree2 || strcmp(type, "tree"))
                usage("unable to read destination tree");
-       return diff_tree(tree1, size1, tree2, size2);
+       retval = diff_tree(tree1, size1, tree2, size2, src, dst);
+       free(tree1);
+       free(tree2);
+       return retval;
+}
+
+int main(int argc, char **argv)
+{
+       unsigned char old[20], new[20];
+
+       while (argc > 3) {
+               char *arg = argv[1];
+               argv++;
+               argc--;
+               if (!strcmp(arg, "-R")) {
+                       recursive = 1;
+                       continue;
+               }
+               usage("diff-tree [-R] <tree sha1> <tree sha1>");
+       }
+
+       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, "", "");
 }

diff --git a/read-cache.c b/read-cache.c
index ebace34..53da500 100644 (file)
--- a/read-cache.c
+++ b/read-cache.c
@@ -63,7 +63,7 @@ char * sha1_to_hex(const unsigned char *sha1)
  * careful about using it. Do a "strdup()" if you need to save the
  * filename.
  */
-char *sha1_file_name(unsigned char *sha1)
+char *sha1_file_name(const unsigned char *sha1)
 {
        int i;
        static char *name, *base;
@@ -99,7 +99,7 @@ int check_sha1_signature(unsigned char *sha1, void *map, unsigned long size)
        return memcmp(sha1, real_sha1, 20) ? -1 : 0;
 }
 
-void *map_sha1_file(unsigned char *sha1, unsigned long *size)
+void *map_sha1_file(const unsigned char *sha1, unsigned long *size)
 {
        char *filename = sha1_file_name(sha1);
        int fd = open(filename, O_RDONLY);
@@ -158,7 +158,7 @@ void * unpack_sha1_file(void *map, unsigned long mapsize, char *type, unsigned l
        return buf;
 }
 
-void * read_sha1_file(unsigned char *sha1, char *type, unsigned long *size)
+void * read_sha1_file(const unsigned char *sha1, char *type, unsigned long *size)
 {
        unsigned long mapsize;
        void *map, *buf;
@@ -208,7 +208,7 @@ int write_sha1_file(char *buf, unsigned len, unsigned char *returnsha1)
        return 0;
 }
 
-int write_sha1_buffer(unsigned char *sha1, void *buf, unsigned int size)
+int write_sha1_buffer(const unsigned char *sha1, void *buf, unsigned int size)
 {
        char *filename = sha1_file_name(sha1);
        int fd;