Make "write_sha1_file()" exit early if the file already exists.

[git.git] / diff-tree.c

diff --git a/diff-tree.c b/diff-tree.c
index 2709f06ba044b2541db0d12ae0366a0ad976251c..65bb9d66c5610b2ede11f03a9120da48c59629f8 100644 (file)
--- a/diff-tree.c
+++ b/diff-tree.c
@@ -1,6 +1,7 @@
 #include "cache.h"
 
 static int recursive = 0;
+static int line_termination = '\n';
 
 static int diff_tree_sha1(const unsigned char *old, const unsigned char *new, const char *base);
 
@@ -73,7 +74,10 @@ static void show_file(const char *prefix, void *tree, unsigned long size, const
                return;
        }
 
-       printf("%s%o %s %s%s%c", prefix, mode, sha1_to_hex(sha1), base, path, 0);
+       printf("%s%o\t%s\t%s\t%s%s%c", prefix, mode,
+              S_ISDIR(mode) ? "tree" : "blob",
+              sha1_to_hex(sha1), base, path,
+              line_termination);
 }
 
 static int compare_tree_entry(void *tree1, unsigned long size1, void *tree2, unsigned long size2, const char *base)
@@ -120,7 +124,10 @@ static int compare_tree_entry(void *tree1, unsigned long size1, void *tree2, uns
        }
 
        strcpy(old_sha1_hex, sha1_to_hex(sha1));
-       printf("*%o->%o %s->%s %s%s%c", mode1, mode2, old_sha1_hex, sha1_to_hex(sha2), base, path1, 0);
+       printf("*%o->%o\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);
        return 0;
 }
 
@@ -172,6 +179,20 @@ static int diff_tree_sha1(const unsigned char *old, const unsigned char *new, co
        return retval;
 }
 
+static void commit_to_tree(unsigned char *sha1)
+{
+       void *buf;
+       char type[20];
+       unsigned long size;
+
+       buf = read_sha1_file(sha1, type, &size);
+       if (buf) {
+               if (!strcmp(type, "commit"))
+                       get_sha1_hex(buf+5, sha1);
+               free(buf);
+       }
+}
+
 int main(int argc, char **argv)
 {
        unsigned char old[20], new[20];
@@ -184,10 +205,16 @@ int main(int argc, char **argv)
                        recursive = 1;
                        continue;
                }
-               usage("diff-tree [-R] <tree sha1> <tree sha1>");
+               if (!strcmp(arg, "-z")) {
+                       line_termination = '\0';
+                       continue;
+               }
+               usage("diff-tree [-r] [-z] <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>");
+       commit_to_tree(old);
+       commit_to_tree(new);
        return diff_tree_sha1(old, new, "");
 }