[PATCH] rev-tree support for "in X but not in Y".

To do the automated commit-mailing I need to be able to answer the
question "which commits are here today but weren't yesterday"...  i.e.
given two commit-ids $HEAD and $YESTERDAY I want to be able to do:

	rev-tree $HEAD ^$YESTERDAY

to list those commits which are in the tree now but weren't
ancestors of yesterday's head.

Yes, I could probably do this with
	rev-tree $HEAD $YESTERDAY | egrep -v ^[a-z0-9]*:3
but I prefer not to.

diff --git a/rev-tree.c b/rev-tree.c
index 7669c5e..21598d6 100644 (file)
--- a/rev-tree.c
+++ b/rev-tree.c
@@ -14,6 +14,7 @@
 #define SEEN 0x10000
 
 static int show_edges = 0;
+static int basemask = 0;
 
 struct parent {
        struct revision *parent;
@@ -180,6 +181,9 @@ static int interesting(struct revision *rev)
                }
                return 0;
        }
+       if (mask & basemask)
+               return 0;
+
        return 1;
 }
 
@@ -214,6 +218,10 @@ int main(int argc, char **argv)
                        continue;
                }
 
+               if (arg[0] == '^') {
+                       arg++;
+                       basemask |= 1<<nr;
+               }
                if (nr >= MAX_COMMITS || get_sha1_hex(arg, sha1[nr]))
                        usage("rev-tree [--edges] [--cache <cache-file>] <commit-id> [<commit-id>]");
                parse_commit(sha1[nr]);