Represent due date in human-friendly format

1 files changed, 75 insertions, 1 deletions

diff --git a/contents/ui/ActivityView.qml b/contents/ui/ActivityView.qml
index c08877a..cbbd6f9 100644
--- a/contents/ui/ActivityView.qml
+++ b/contents/ui/ActivityView.qml
@@ -13,6 +13,80 @@ RowLayout {
     width: parent.width
     Layout.fillWidth: true
 
+    function sameDay(due, now) {
+        return (
+            due.getFullYear() == now.getFullYear() &&
+            due.getMonth() == now.getMonth() &&
+            due.getDate() == now.getDate()
+        )
+    }
+
+    function dayDiff(due, now, stopAt) {
+        // due and now are both Date objects
+        // if due has the same day as now (i.e. due is today), return 0
+        // if due is tomorrow, return 1, the day after that 2, yesterday -1, etc.
+        // when the absolute value of diff reaches stopAt, return stopAt
+        let diff = 0
+        const step = (due > now) ? 1 : -1
+        while (!sameDay(due, now)) {
+            now.setDate(now.getDate() + step)
+            diff += step
+            if (Math.abs(diff) >= stopAt) {
+                return stopAt
+            }
+        }
+        return diff
+    }
+
+    function humanDue(isoDue) {
+        // converts ISO 8601 datetime string to relative time, e.g. tomorrow midnight
+        const daysOfWeek = [
+            i18n("Sunday"),
+            i18n("Monday"),
+            i18n("Tuesday"),
+            i18n("Wednesday"),
+            i18n("Thursday"),
+            i18n("Friday"),
+            i18n("Saturday"),
+        ]
+
+        try {
+            let due = new Date(isoDue)
+            if (due.toString() == "Invalid Date") {
+                console.warn(`Cannot parse due date: ${isoDue}`)
+                return isoDue
+            }
+
+            let now = new Date()
+            const pastDue = (due <= now)
+            const dayDifference = dayDiff(due, now, 8)
+            let humanDueString = ""
+
+            if (dayDifference <= -2) {
+                humanDateString = Qt.formatDate(due)
+            } else if (dayDifference == -1) {
+                humanDueString = i18n("Yesterday")
+            } else if (dayDifference == 0) {
+                humanDueString = i18n("Today")
+            } else if (dayDifference == 1) {
+                humanDueString = i18n("Tomorrow")
+            } else if (dayDifference <= 6) {
+                humanDueString = daysOfWeek[due.getDay()]
+            } else {
+                humanDueString = Qt.formatDate(due)
+            }
+
+            humanDueString += " " + Qt.formatTime(due)
+
+            if (pastDue) {
+                humanDueString += " " + i18n("(missed)")
+            }
+            return humanDueString
+        } catch (e) {
+            return isoDue // screw it
+        }
+    }
+
     RowLayout {
         Layout.fillWidth: true
         PlasmaComponents3.CheckBox {
@@ -37,7 +111,7 @@ RowLayout {
             PlasmaComponents3.Label {
                 id: dueLabel
                 visible: type == "assignment"
-                text: "Due " + (due || "unknown")
+                text: dueAt ? ("Due: " + humanDue(dueAt)) : ""
                 color: activityLabel.color
                 Layout.fillWidth: true
             }