Make snapshot feature configurable

Snapshots can now be enabled/disabled by default for all repositories in
cgitrc with param "snapshots". Additionally, any repo can override the
default setting with param "repo.snapshots".

By default, no snapshotting is enabled.

Signed-off-by: Lars Hjemli <hjemli@gmail.com>

ui-commit.c

@@ -169,11 +169,13 @@ void cgit_print_commit(const char *hex)
 		htmlf("'>%s</a></td></tr>\n", 
 		      sha1_to_hex(p->item->object.sha1));
 	}
-	htmlf("<tr><th>download</th><td colspan='2' class='sha1'><a href='");
-	filename = fmt("%s-%s.zip", cgit_query_repo, hex);
-	html_attr(cgit_pageurl(cgit_query_repo, "snapshot", 
-			       fmt("id=%s&name=%s", hex, filename)));
-	htmlf("'>%s</a></td></tr>", filename);
+	if (cgit_repo->snapshots) {
+		htmlf("<tr><th>download</th><td colspan='2' class='sha1'><a href='");
+		filename = fmt("%s-%s.zip", cgit_query_repo, hex);
+		html_attr(cgit_pageurl(cgit_query_repo, "snapshot", 
+				       fmt("id=%s&name=%s", hex, filename)));
+		htmlf("'>%s</a></td></tr>", filename);
+	}
 	
 	html("</table>\n");
 	html("<div class='commit-subject'>");