Merge pull request #624 from lisps/revisions

 date_at support 

1 files changed, 36 insertions, 1 deletions

diff --git a/doku.php b/doku.php
index da3643544..f4309d122 100644
--- a/doku.php
+++ b/doku.php
@@ -34,6 +34,7 @@ $QUERY          = trim($INPUT->str('id'));
 $ID             = getID();
 
 $REV   = $INPUT->int('rev');
+$DATE_AT = $INPUT->str('at');
 $IDX   = $INPUT->str('idx');
 $DATE  = $INPUT->int('date');
 $RANGE = $INPUT->str('range');
@@ -47,7 +48,41 @@ $PRE = cleanText(substr($INPUT->post->str('prefix'), 0, -1));
 $SUF = cleanText($INPUT->post->str('suffix'));
 $SUM = $INPUT->post->str('summary');
 
-//make info about the selected page available
+
+//parse DATE_AT
+if($DATE_AT) {
+    $date_parse = strtotime($DATE_AT);
+    if($date_parse) {
+        $DATE_AT = $date_parse;
+    } else { // check for UNIX Timestamp
+        $date_parse = @date('Ymd',$DATE_AT);
+        if(!$date_parse || $date_parse === '19700101') {
+            msg(sprintf($lang['unable_to_parse_date'], $DATE_AT));
+            $DATE_AT = null;
+        }
+    }
+}
+
+//check for existing $REV related to $DATE_AT
+if($DATE_AT) {
+    $pagelog = new PageChangeLog($ID);
+    $rev_t = $pagelog->getLastRevisionAt($DATE_AT);
+    if($rev_t === '') { //current revision
+        $REV = null;
+        $DATE_AT = null;
+    } else if ($rev_t === false) { //page did not exist
+        $rev_n = $pagelog->getRelativeRevision($DATE_AT,+1);
+        msg(sprintf($lang['page_nonexist_rev'], 
+            strftime($conf['dformat'],$DATE_AT),
+            wl($ID, array('rev' => $rev_n)),
+            strftime($conf['dformat'],$rev_n)));
+        $REV = $DATE_AT; //will result in a page not exists message
+    } else {
+        $REV = $rev_t;
+    }
+}
+
+//make infos about the selected page available
 $INFO = pageinfo();
 
 //export minimal info to JS, plugins can add more