adding support for 1x2 widget size for history widget

uhabits-android/src/main/res/xml/widget_history_info.xml

@@ -21,11 +21,13 @@
 <appwidget-provider xmlns:android="http://schemas.android.com/apk/res/android"
                     android:minHeight="80dp"
                     android:minWidth="80dp"
-                    android:minResizeWidth="80dp"
+                    android:targetCellWidth="2"
+                    android:targetCellHeight="2"
+                    android:minResizeWidth="40dp"
                     android:minResizeHeight="80dp"
                     android:initialLayout="@layout/widget_graph"
                     android:previewImage="@drawable/widget_preview_history"
-                    android:resizeMode="vertical|horizontal"
+                    android:resizeMode="horizontal|vertical"
                     android:updatePeriodMillis="3600000"
                     android:configure="org.isoron.uhabits.widgets.activities.HabitPickerDialog"
                     android:widgetCategory="home_screen">

uhabits-core/src/commonMain/kotlin/org/isoron/platform/time/Dates.kt

@@ -136,6 +136,8 @@ data class LocalDate(val daysSince2000: Int) {
 }
 
 interface LocalDateFormatter {
+    fun narrowWeekdayName(weekday: DayOfWeek): String
+    fun narrowWeekdayName(date: LocalDate): String
     fun shortWeekdayName(weekday: DayOfWeek): String
     fun shortWeekdayName(date: LocalDate): String
     fun shortMonthName(date: LocalDate): String

uhabits-core/src/jvmMain/java/org/isoron/platform/time/JavaDates.kt

@@ -27,6 +27,7 @@ import java.util.Calendar.LONG
 import java.util.Calendar.MILLISECOND
 import java.util.Calendar.MINUTE
 import java.util.Calendar.MONTH
+import java.util.Calendar.NARROW_FORMAT
 import java.util.Calendar.SECOND
 import java.util.Calendar.SHORT
 import java.util.Calendar.YEAR
@@ -68,6 +69,17 @@ class JavaLocalDateFormatter(private val locale: Locale) : LocalDateFormatter {
         return cal.getDisplayName(DAY_OF_WEEK, SHORT, locale)
     }
 
+    override fun narrowWeekdayName(weekday: DayOfWeek): String {
+        val cal = GregorianCalendar()
+        cal.set(DAY_OF_WEEK, weekday.daysSinceSunday - 1)
+        return shortWeekdayName(LocalDate(cal.get(YEAR), cal.get(MONTH) + 1, cal.get(DAY_OF_MONTH)))
+    }
+
+    override fun narrowWeekdayName(date: LocalDate): String {
+        val cal = date.toGregorianCalendar()
+        return cal.getDisplayName(DAY_OF_WEEK, NARROW_FORMAT, locale)
+    }
+
     fun longFormat(date: LocalDate): String {
         val df = DateFormat.getDateInstance(DateFormat.LONG, locale)
         df.timeZone = TimeZone.getTimeZone("UTC")

uhabits-core/src/jvmMain/java/org/isoron/uhabits/core/ui/views/HistoryChart.kt

@@ -107,11 +107,9 @@ class HistoryChart(
         squareSize = round((height - 2 * padding) / 8.0)
         canvas.setFontSize(min(14.0, height * 0.06))
 
-        val weekdayColumnWidth = DayOfWeek.values().map { weekday ->
-            canvas.measureText(dateFormatter.shortWeekdayName(weekday)) + squareSize * 0.15
-        }.maxOrNull() ?: 0.0
+        val weekdayColumnWidth = calculateWeekdayColumnWidth(canvas)
 
-        nColumns = floor((width - 2 * padding - weekdayColumnWidth) / squareSize).toInt()
+        nColumns = calcNumOfColumns(weekdayColumnWidth)
         val firstWeekdayOffset = (
             today.dayOfWeek.daysSinceSunday -
                 firstWeekday.daysSinceSunday + 7
@@ -136,13 +134,43 @@ class HistoryChart(
             val date = topLeftDate.plus(row)
             canvas.setTextAlign(TextAlign.LEFT)
             canvas.drawText(
-                dateFormatter.shortWeekdayName(date),
-                padding + nColumns * squareSize + squareSize * 0.15,
+                weekdayDisplayName(date),
+                padding + nColumns * squareSize + 1.5,
                 padding + squareSize * (row + 1) + squareSize / 2
             )
         }
     }
 
+    private fun calcNumOfColumns(weekdayColumnWidth: Double) =
+        floor((width - 2 * padding - weekdayColumnWidth) / squareSize).toInt()
+
+    private fun weekdayDisplayName(weekday: DayOfWeek): String {
+        if (shouldUseNarrowWeekdayName()) {
+            return dateFormatter.narrowWeekdayName(weekday)
+        }
+        return dateFormatter.shortWeekdayName(weekday)
+    }
+
+    private fun weekdayDisplayName(localDate: LocalDate): String {
+        if (shouldUseNarrowWeekdayName()) {
+            return dateFormatter.narrowWeekdayName(localDate)
+        }
+        return dateFormatter.shortWeekdayName(localDate)
+    }
+
+    private fun calculateWeekdayColumnWidth(canvas: Canvas): Double {
+        if (shouldUseNarrowWeekdayName()) {
+            return 0.0
+        }
+        return DayOfWeek.values().map { weekday ->
+            canvas.measureText(weekdayDisplayName(weekday)) + 1.5
+        }.maxOrNull() ?: 0.0
+    }
+
+    private fun shouldUseNarrowWeekdayName(): Boolean {
+        // based off 80dp minWidth in widget_history_info.xml
+        return width < 80
+    }
     private fun drawColumn(
         canvas: Canvas,
         column: Int,