feature: add tooltip for commit time that shows how much time it is from now (#259)

* this tooltip does NOT update until it's owner row recreated or the DataContext of that row changed. You can scroll it out of bounds to force refresh the tooltip

src/Models/Commit.cs

@@ -25,5 +25,46 @@ namespace SourceGit.Models
 
         public bool IsCommitterVisible => !Author.Equals(Committer) || AuthorTime != CommitterTime;
         public bool IsCurrentHead => Decorators.Find(x => x.Type is DecoratorType.CurrentBranchHead or DecoratorType.CurrentCommitHead) != null;
+    
+        public string CommitterTimeFromNowString
+        {
+            get
+            {
+                var today = DateTime.Today;
+                var committerTime = DateTime.UnixEpoch.AddSeconds(CommitterTime).ToLocalTime();
+
+                if (committerTime >= today)
+                {
+                    var now = DateTime.Now;
+                    var timespan = now - committerTime;
+                    if (timespan.TotalHours > 1)
+                        return $"{(int)timespan.TotalHours} hours ago";
+
+                    if (timespan.TotalMinutes > 1)
+                        return $"{(int)timespan.TotalMinutes} minutes ago";
+
+                    return $"Just now";
+                }
+
+                var diffYear = today.Year - committerTime.Year;
+                if (diffYear == 0)
+                {
+                    var diffMonth = today.Month - committerTime.Month;
+                    if (diffMonth > 0)
+                        return diffMonth == 1 ? "Last month" : $"{diffMonth} months ago";
+
+                    var diffDay = today.Day - committerTime.Day;
+                    if (diffDay > 0)
+                        return diffDay == 1 ? "Yesterday" : $"{diffDay} days ago";
+
+                    return "Today";
+                }
+
+                if (diffYear == 1)
+                    return "Last year";
+
+                return $"{diffYear} years ago";
+            }
+        }
     }
 }

src/Views/Histories.axaml

@@ -160,11 +160,13 @@
             
             <DataGridTemplateColumn.CellTemplate>
               <DataTemplate x:DataType="{x:Type m:Commit}">
+                <Border Background="Transparent" ToolTip.Tip="{Binding CommitterTimeFromNowString}">
                   <TextBlock Classes="monospace"
                              Text="{Binding CommitterTimeStr}"
                              Margin="8,0"
                              Opacity="{Binding IsMerged, Converter={x:Static c:BoolConverters.HalfIfFalse}}"
                              FontWeight="{Binding IsCurrentHead, Converter={x:Static c:BoolConverters.BoldIfTrue}}"/>
+                </Border>
               </DataTemplate>
             </DataGridTemplateColumn.CellTemplate>
           </DataGridTemplateColumn>