[trojita] src/Gui: GUI: detect some calendaring events

[Jan Kundrát]

Git commit 6fdf31cd3562ed445a27fabe6e1590445de161d9 by Jan Kundrát.
Committed on 02/05/2019 at 11:44.
Pushed by gerrit into branch 'master'.

GUI: detect some calendaring events

So, I started getting many text/calendar items from
$corporate_environment. Let's try if Trojita's experience when dealing
with this can be improved a little bit.

The first step is determining the kind of the calendar object from MIME.
This is standardized [1] and provided by IMAP's usual BODYSTRUCTURE. I
was thinking that the UX could be made better by directly showing
whether this is:

- an invitation which typically requests some action or targets "me",
- some ad-hoc event notification,
- a reply to an invitation, etc.

This can be done even without parsing ical files at all, which is nice.
What I would like to see in future is some basic UI rendering of the
calendar object, integration with an external calendar system (hi
vdirsyncer+khal, etc), and a way of sending replies
(confirmation/rejection) when I'm invited to a meeting. That's for
future work, though.

[1] https://tools.ietf.org/html/rfc5546#section-3.2

Change-Id: Icfd90ad3dad3d5d6ae5a2c7dce1cad8f44b89ee2

M  +21   -1    src/Gui/PartWidget.cpp

https://commits.kde.org/trojita/6fdf31cd3562ed445a27fabe6e1590445de161d9

diff --git a/src/Gui/PartWidget.cpp b/src/Gui/PartWidget.cpp
index f73bd665..bb27604d 100644
--- a/src/Gui/PartWidget.cpp
+++ b/src/Gui/PartWidget.cpp
@@ -38,6 +38,7 @@
 #include "Gui/Util.h"
 #include "Imap/Model/ItemRoles.h"
 #include "Imap/Model/MailboxTree.h"
+#include "Imap/Parser/Message.h"
 #include "UiUtils/IconLoader.h"
 
 namespace {
@@ -134,6 +135,7 @@ MultipartAlternativeWidget::MultipartAlternativeWidget(QWidget *parent,
 
         const bool isPlainText = mimeType == QLatin1String("text/plain");
         const bool isHtml = mimeType == QLatin1String("text/html");
+        const bool isCalendar = mimeType == QLatin1String("text/calendar");
 
         if (isPlainText) {
             //: Translators: use something very short, perhaps even "text". Don't describe this as "Clear text".
@@ -143,13 +145,31 @@ MultipartAlternativeWidget::MultipartAlternativeWidget(QWidget *parent,
         } else if (isHtml) {
             //: Translators: caption of the tab which shows a HTML version of the mail. Use some short, compact text here.
             mimeType = tr("HTML");
+        } else if (isCalendar) {
+            using bodyFldParam_t = Imap::Message::AbstractMessage::bodyFldParam_t;
+            const auto bodyFldParam = anotherPart.data(Imap::Mailbox::RolePartBodyFldParam).value<bodyFldParam_t>();
+            auto method = bodyFldParam[QByteArray("METHOD")].toUpper();
+            if (method == "CANCEL") {
+                mimeType = tr("Cancelled Event");
+            } else if (method == "REQUEST") {
+                mimeType = tr("Meeting Request");
+            } else if (method == "PUBLISH") {
+                mimeType = tr("Calendar Event");
+            } else if (method == "REPLY") {
+                mimeType = tr("Calendar Reply");
+            } else if (method == "ADD") {
+                mimeType = tr("New Meeting");
+            }
+            // We do not handle REFRESH, COUNTER or DECLINECOUNTER because they are "too specific" for now
         }
 
         addTab(item, mimeType);
 
         // Bug 332950: some items nested within a multipart/alternative message are not exactly an alternative.
         // One such example is a text/calendar right next to a text/html and a text/plain.
-        if (!isPlainText && !isHtml) {
+        if (isCalendar) {
+            setTabIcon(i, UiUtils::loadIcon(QStringLiteral("text-calendar")));
+        } else if (!isPlainText && !isHtml) {
             // Unfortunately we cannot change the tab background with current Qt (Q1 2014),
             // see https://bugreports.qt-project.org/browse/QTBUG-840 for details
             setTabIcon(i, UiUtils::loadIcon(QStringLiteral("emblem-important")));