Add support for log output minus another branchHEADmaster

This lets you do the equivalent of
    git log ^ref1 ref2

by adding an id2 parameter to a log url

1 files changed, 11 insertions, 3 deletions

diff --git a/ui-log.c b/ui-log.c
index 499534c..824da02 100644
--- a/ui-log.c
+++ b/ui-log.c
@@ -285,18 +285,24 @@ static char *next_token(char **src)
 	return result;
 }
 
-void cgit_print_log(const char *tip, int ofs, int cnt, char *grep, char *pattern,
-		    char *path, int pager, int commit_graph, int commit_sort)
+void cgit_print_log(const char *tip, const char *from, int ofs, int cnt,
+		    char *grep, char *pattern, char *path, int pager,
+		    int commit_graph, int commit_sort)
 {
 	struct rev_info rev;
 	struct commit *commit;
 	struct argv_array rev_argv = ARGV_ARRAY_INIT;
 	int i, columns = commit_graph ? 4 : 3;
-	int must_free_tip = 0;
+	int must_free_tip = 0, must_free_from = 0;
 
 	/* rev_argv.argv[0] will be ignored by setup_revisions */
 	argv_array_push(&rev_argv, "log_rev_setup");
 
+	if (from) {
+		from = disambiguate_ref(from, &must_free_from);
+		argv_array_pushf(&rev_argv, "^%s", from);
+	}
+
 	if (!tip)
 		tip = ctx.qry.head;
 	tip = disambiguate_ref(tip, &must_free_tip);
@@ -430,4 +436,6 @@ void cgit_print_log(const char *tip, int ofs, int cnt, char *grep, char *pattern
 	/* If we allocated tip then it is safe to cast away const. */
 	if (must_free_tip)
 		free((char*) tip);
+	if (must_free_from)
+		free((char*) from);
 }