[1/5] Parsing code in revision.h

This adds support to revision.h for parsing commit records (but not going
any further than parsing a single record). Something like this is needed
by anything that uses revision.h, but older programs open-code it.

Signed-Off-By: Daniel Barkalow <barkalow@iabervon.org>
Index: revision.h
===================================================================
--- 45f926575d2c44072bfcf2317dbf3f0fbb513a4e/revision.h  (mode:100644 sha1:28d0de3261a61f68e4e0948a25a416a515cd2e83)
+++ 37a0b01b85c2999243674d48bfc71cdba0e5518e/revision.h  (mode:100644 sha1:523bde6e14e18bb0ecbded8f83ad4df93fc467ab)
@@ -24,6 +24,7 @@
 	unsigned int flags;
 	unsigned char sha1[20];
 	unsigned long date;
+	unsigned char tree[20];
 	struct parent *parent;
 };
 
@@ -111,4 +112,29 @@
 	}
 }
 
+static int parse_commit_object(struct revision *rev)
+{
+	if (!(rev->flags & SEEN)) {
+		void *buffer, *bufptr;
+		unsigned long size;
+		char type[20];
+		unsigned char parent[20];
+
+		rev->flags |= SEEN;
+		buffer = bufptr = read_sha1_file(rev->sha1, type, &size);
+		if (!buffer || strcmp(type, "commit"))
+			return -1;
+		get_sha1_hex(bufptr + 5, rev->tree);
+		bufptr += 46; /* "tree " + "hex sha1" + "\n" */
+		while (!memcmp(bufptr, "parent ", 7) && 
+		       !get_sha1_hex(bufptr+7, parent)) {
+			add_relationship(rev, parent);
+			bufptr += 48;   /* "parent " + "hex sha1" + "\n" */
+		}
+		//rev->date = parse_commit_date(bufptr);
+		free(buffer);
+	}
+	return 0;
+}
+
 #endif /* REVISION_H */

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