Add customizable date format options

src/DesktopMagic/BuiltInPlugins/DatePlugin.cs

@@ -4,13 +4,28 @@ using DesktopMagic.Api.Settings;
 using System;
 using System.Drawing;
 using System.Drawing.Text;
+using System.Globalization;
+using System.Linq;
+using System.Text.RegularExpressions;
 
 namespace DesktopMagic.BuiltInPlugins;
 
-internal class DatePlugin : Plugin
+internal partial class DatePlugin : Plugin
 {
-    [Setting("short-date", "Short date")]
+    [Setting("week-day-style", "Week Day Style")]
-    private readonly CheckBox shortDateCheckBox = new CheckBox(true);
+    public ComboBox weekDayStyleComboBox = new ComboBox([.. Enum.GetValues<WeekdayStyle>().Select(e => e.ToString())]);
+
+    [Setting("day-style", "Day Style")]
+    public ComboBox dayStyleComboBox = new ComboBox([.. Enum.GetValues<DayStyle>().Select(e => e.ToString())]);
+
+    [Setting("month-style", "Month Style")]
+    public ComboBox monthStyleComboBox = new ComboBox([.. Enum.GetValues<MonthStyle>().Select(e => e.ToString())]);
+
+    [Setting("year-style", "Year Style")]
+    public ComboBox yearStyleComboBox = new ComboBox([.. Enum.GetValues<YearStyle>().Select(e => e.ToString())]);
+
+    [Setting("use-date-separators", "Use Date Separators")]
+    public CheckBox useDateSeparators = new CheckBox(true);
 
     private DateTime oldDateTime = DateTime.MinValue;
     private bool themeChanged = false;
@@ -27,7 +42,64 @@ internal class DatePlugin : Plugin
         oldDateTime = DateTime.Now;
         themeChanged = false;
 
-        string date = shortDateCheckBox.Value ? DateTime.Now.ToShortDateString() : DateTime.Now.ToLongDateString();
+        CultureInfo culture = CultureInfo.CurrentCulture;
+        DateTime dateTime = DateTime.Now;
+
+        DateTimeFormatInfo dtf = culture.DateTimeFormat;
+
+        string pattern = dtf.LongDatePattern;
+
+        WeekdayStyle weekdayStyle = Enum.Parse<WeekdayStyle>(weekDayStyleComboBox.Value);
+        DayStyle dayStyle = Enum.Parse<DayStyle>(dayStyleComboBox.Value);
+        MonthStyle monthStyle = Enum.Parse<MonthStyle>(monthStyleComboBox.Value);
+        YearStyle yearStyle = Enum.Parse<YearStyle>(yearStyleComboBox.Value);
+
+        // Weekday: ddd, dddd
+        pattern = WeekdayRegex().Replace(pattern, weekdayStyle switch
+        {
+            WeekdayStyle.Long => "dddd",
+            WeekdayStyle.Short => "ddd",
+            _ => ""
+        });
+
+        // Day: d, dd
+        pattern = DayRegex().Replace(pattern, dayStyle switch
+        {
+            DayStyle.Numeric => "dd",
+            _ => ""
+        });
+
+        // Month: M, MM, MMM, MMMM
+        pattern = MonthRegex().Replace(pattern, monthStyle switch
+        {
+            MonthStyle.Long => "MMMM",
+            MonthStyle.Short => "MMM",
+            MonthStyle.Numeric => "MM",
+            _ => ""
+        });
+
+        // Year: yy, yyyy
+        pattern = YearRegex().Replace(pattern, yearStyle switch
+        {
+            YearStyle.FourDigit => "yyyy",
+            YearStyle.TwoDigit => "yy",
+            _ => ""
+        });
+
+        // Clean up leftover punctuation/spacing
+        pattern = CleanupRegex().Replace(pattern, " ").Trim();
+
+        if (string.IsNullOrWhiteSpace(pattern))
+        {
+            pattern = dtf.LongDatePattern;
+        }
+
+        string date = dateTime.ToString(pattern, culture);
+
+        if (useDateSeparators.Value)
+        {
+            date = DateSeparatorsRegex().Replace(date, dtf.DateSeparator);
+        }
 
         using Font font = new Font(Application.Theme.Font, 200);
 
@@ -59,4 +131,27 @@ internal class DatePlugin : Plugin
     {
         themeChanged = true;
     }
-}
+
+    [GeneratedRegex(@"d{3,4}")]
+    private static partial Regex WeekdayRegex();
+
+    [GeneratedRegex(@"\b(?<!d)d{1,2}\b")]
+    private static partial Regex DayRegex();
+
+    [GeneratedRegex(@"M{1,4}")]
+    private static partial Regex MonthRegex();
+
+    [GeneratedRegex(@"y{2,4}")]
+    private static partial Regex YearRegex();
+
+    [GeneratedRegex(@"[\s,./\-]+")]
+    private static partial Regex CleanupRegex();
+
+    [GeneratedRegex(@"(?<=\d)\s+(?=\d)")]
+    private static partial Regex DateSeparatorsRegex();
+
+    public enum WeekdayStyle { None, Short, Long }
+    public enum DayStyle { None, Numeric }
+    public enum MonthStyle { None, Numeric, Short, Long }
+    public enum YearStyle { None, TwoDigit, FourDigit }
+}