Allow sessions to be active for a given date range

.xml files for Virtual Sessions may have an "active"-element
this patch allows a date range to be given as a parameter for that element

<active param="[YYYY-MM-DD]/[YYYY-MM-DD]"/>

examples:
* <active param="1970-01-01/1971-01-01">
    active from Jan 1st 1970 till Jan 1st 1971
* <active param="/1971-01-01">
    active till Jan 1st 1971
* <active param="1970-01-01/">
    active from Jan 1st 1970 onwards

notes:
* invalid dates are treated like empty dates (eg. "1984-01-01/1984-02-30" is equal to "1984-01-01/")
* active defaults to "true" for all values except "false" and past or future date ranges
* an inactive session will not be displayed by vmchooser, this does not prevent the user from manually starting the corrensponding virtual machine image

1 files changed, 35 insertions, 2 deletions

diff --git a/src/vsession.cpp b/src/vsession.cpp
index f51fa3a..35292d2 100644
--- a/src/vsession.cpp
+++ b/src/vsession.cpp
@@ -2,6 +2,8 @@
 #include <QDir>
 #include <QApplication>
 #include <QProcess>
+#include <QDate>
+#include <QStringList>
 #if 0
 #include <QHostInfo> // available since Qt 4.7
 #endif
@@ -83,8 +85,39 @@ ImgType VSession::imgtype() const {
 }
 
 bool VSession::isActive() const {
-    // default to true
-    return getAttribute("active").compare("false");
+    QString value(getAttribute("active"));
+
+    if (value.compare("false")) {
+        return false;
+    } else if (value.count("/") == 1) {
+        // try to interpret value as date range
+        // [YYYY-MM-DD]/[YYYY-MM-DD]
+        // eg. "1970-01-01/1971-01-01" from Jan 1st 1970 till Jan 1st 1971
+        //     "/1971-01-01"           till Jan 1st 1971
+        //     "1970-01-01/"           from Jan 1st 1970
+        //     "/"                     allways
+        // note: invalid dates are treated as empty dates
+
+        QStringList list(value.split("/"));
+        QString from(list.value(0));
+        QString till(list.value(1));
+        QDate fromDate(QDate::fromString(from, Qt::ISODate));
+        QDate tillDate(QDate::fromString(till, Qt::ISODate));
+
+        QDate today(QDate::currentDate());
+
+        if (fromDate.isValid() && fromDate > today) {
+            // fromDate is in the future
+            return false;
+        }
+
+        if (tillDate.isValid() && tillDate < today) {
+            // tillDate is in the past
+            return false;
+        }
+    }
+
+    return true;
 }
 
 bool VSession::isLocked() const {