Clean up the Todo display code

todo/display.go

@@ -9,86 +9,50 @@ import (
 const checkWidth = 4
 
 func (widget *Widget) display() {
-	widget.View.Clear()
-
-	maxLen := widget.longestLineLen(widget.list.Items)
-
 	str := ""
-	checked := []*Item{}
-	var selectedItem *Item
-	var newList List
-	for idx, item := range widget.list.Items {
-		foreColor, backColor := "white", "black"
+	newList := List{selected: -1}
 
-		// save the selected one
-		if idx == widget.list.selected {
-			selectedItem = item
-		}
-
-		if item.Checked {
-			checked = append(checked, item)
-			continue
-		}
-
-		if widget.View.HasFocus() && item == selectedItem {
-			foreColor = Config.UString("wtf.mods.todo.colors.highlight.fore", "black")
-			backColor = Config.UString("wtf.mods.todo.colors.highlight.back", "white")
-		}
-
-		str = str + fmt.Sprintf(
-			"[%s:%s]|%s| %s[white]",
-			foreColor,
-			backColor,
-			item.CheckMark(),
-			item.Text,
-		)
-
-		str = str + wtf.PadRow((4+len(item.Text)), (4+maxLen)) + "\n"
-
-		newList.Items = append(newList.Items, item)
-	}
-	for _, item := range checked {
-		foreColor, backColor := Config.UString("wtf.mods.todo.colors.checked", "white"), "black"
-
-		if widget.View.HasFocus() && item == selectedItem {
-			foreColor = Config.UString("wtf.mods.todo.colors.highlight.fore", "black")
-			backColor = Config.UString("wtf.mods.todo.colors.highlight.back", "white")
-		}
-		str = str + fmt.Sprintf(
-			"[%s:%s]|%s| %s[white]",
-			foreColor,
-			backColor,
-			item.CheckMark(),
-			item.Text,
-		)
-
-		str = str + wtf.PadRow((4+len(item.Text)), (4+maxLen)) + "\n"
+	selectedItem := widget.list.Selected()
+	maxLineLen := widget.list.LongestLine()
 
+	for _, item := range widget.list.UncheckedItems() {
+		str = str + widget.formattedItemLine(item, selectedItem, maxLineLen)
 		newList.Items = append(newList.Items, item)
 	}
 
-	// update selected index with new index of selected item
-	for idx, item := range newList.Items {
-		if item == selectedItem {
-			newList.selected = idx
-		}
+	for _, item := range widget.list.CheckedItems() {
+		str = str + widget.formattedItemLine(item, selectedItem, maxLineLen)
+		newList.Items = append(newList.Items, item)
 	}
 
-	// update list with new Items and selected item index
-	widget.list = &newList
+	newList.SetSelectedByItem(widget.list.Selected())
+	widget.SetList(&newList)
 
+	widget.View.Clear()
 	fmt.Fprintf(widget.View, "%s", str)
 }
 
-// longestLineLen returns the length of the longest todo item line
-func (widget *Widget) longestLineLen(items []*Item) int {
-	maxLen := 0
+func (widget *Widget) formattedItemLine(item *Item, selectedItem *Item, maxLen int) string {
+	foreColor, backColor := "white", "black"
 
-	for _, item := range items {
-		if len(item.Text) > maxLen {
-			maxLen = len(item.Text)
-		}
+	if item.Checked {
+		foreColor = Config.UString("wtf.mods.todo.colors.checked", "white")
 	}
 
-	return maxLen
+	if widget.View.HasFocus() && (item == selectedItem) {
+		foreColor = Config.UString("wtf.mods.todo.colors.highlight.fore", "black")
+		backColor = Config.UString("wtf.mods.todo.colors.highlight.back", "white")
+	}
+
+	str := fmt.Sprintf(
+		"[%s:%s]|%s| %s[white]",
+		foreColor,
+		backColor,
+		item.CheckMark(),
+		item.Text,
+	)
+
+	str = str + wtf.PadRow((checkWidth+len(item.Text)), (checkWidth+maxLen)) + "\n"
+
+	return str
 }

todo/list.go

@@ -19,6 +19,18 @@ func (list *List) Add(text string) {
 	list.Items = append([]*Item{&item}, list.Items...)
 }
 
+func (list *List) CheckedItems() []*Item {
+	items := []*Item{}
+
+	for _, item := range list.Items {
+		if item.Checked {
+			items = append(items, item)
+		}
+	}
+
+	return items
+}
+
 func (list *List) Delete() {
 	list.Items = append(list.Items[:list.selected], list.Items[list.selected+1:]...)
 }
@@ -44,6 +56,18 @@ func (list *List) Next() {
 	}
 }
 
+func (list *List) LongestLine() int {
+	maxLen := 0
+
+	for _, item := range list.Items {
+		if len(item.Text) > maxLen {
+			maxLen = len(item.Text)
+		}
+	}
+
+	return maxLen
+}
+
 func (list *List) Prev() {
 	list.selected = list.selected - 1
 	if list.selected < 0 {
@@ -73,13 +97,34 @@ func (list *List) Selected() *Item {
 	return list.Items[list.selected]
 }
 
-// Toggle switches the checked state of the selected item
+func (list *List) SetSelectedByItem(selectableItem *Item) {
+	for idx, item := range list.Items {
+		if item == selectableItem {
+			list.selected = idx
+			break
+		}
+	}
+}
+
+// Toggle switches the checked state of the currently-selected item
 func (list *List) Toggle() {
 	if list.isUnselectable() {
 		return
 	}
 
-	list.Items[list.selected].Toggle()
+	list.Selected().Toggle()
+}
+
+func (list *List) UncheckedItems() []*Item {
+	items := []*Item{}
+
+	for _, item := range list.Items {
+		if !item.Checked {
+			items = append(items, item)
+		}
+	}
+
+	return items
 }
 
 func (list *List) Unselect() {

todo/widget.go

@@ -70,6 +70,10 @@ func (widget *Widget) Refresh() {
 	widget.display()
 }
 
+func (widget *Widget) SetList(newList *List) {
+	widget.list = newList
+}
+
 /* -------------------- Unexported Functions -------------------- */
 
 // edit opens a modal dialog that permits editing the text of the currently-selected item