Correct index year range

processor

@@ -2,7 +2,7 @@
 #
 # Generates HTML from repository commit messages
 #
-#  Copyright (C) 2012  Mike Gerwitz
+#  Copyright (C) 2012, 2016  Mike Gerwitz
 #
 #  This file is part of repo2html.
 #
@@ -55,8 +55,8 @@ do-index()
 
   prevdate=
   lastts=
-  firstyear=0
   lastyear=0
+  firstyear=
   lasthash=
 
   # generate index
@@ -79,8 +79,8 @@ do-index()
     # commits are ordered by date desc
     lasthash="${lasthash:-$hash}"
     lastts="${lastts:-$ts}"
-    lastyear="${lastyear:-$year}"
-    firstyear="$year"
+    firstyear="${firstyear:-$year}"
+    lastyear="$year"
 
     pagefile_base="$( outfgen "$ts" "$id" )"
     pagefile_url="$pagefile_base$html_url_ext"
@@ -115,8 +115,8 @@ do-index()
   $footout
 
   yearrange="$firstyear"
-  if [ "$lastyear" -gt "$firstyear" ]; then
-    yearrange="$firstyear–$lastyear"
+  if [ "$firstyear" -gt "$lastyear" ]; then
+    yearrange="$lastyear–$firstyear"
   fi
 }