From a925eec3305f21501f0d4c97e325aafbf36162cd Mon Sep 17 00:00:00 2001
From: Brian Buller <brbuller@gmail.com>
Date: Wed, 24 Apr 2019 07:20:41 -0500
Subject: [PATCH] Advanced Priority Sorting (If none, but above 'Z')

---
 model.go       | 39 +++++++++++++++++++++++++++++++++++++++
 screen_main.go |  3 +--
 2 files changed, 40 insertions(+), 2 deletions(-)

diff --git a/model.go b/model.go
index 89e5507..fabf2d8 100644
--- a/model.go
+++ b/model.go
@@ -1,6 +1,7 @@
 package main
 
 import (
+	"sort"
 	"strings"
 	"time"
 
@@ -189,3 +190,41 @@ func (a *AppState) WriteDoneList() error {
 	}
 	return a.DoneList.WriteToFilename(a.getDoneFile())
 }
+
+func (a *AppState) AdvancedPrioritySort(t1, t2 *todotxt.Task) bool {
+	if t1.HasPriority() && t2.HasPriority() {
+		return t1.Priority < t2.Priority
+	} else if t1.HasPriority() && !t2.HasPriority() {
+		return t1.Priority <= "Y"
+	} else if !t1.HasPriority() && t2.HasPriority() {
+		return "Y" <= t2.Priority
+	}
+	return t1.HasPriority()
+}
+
+type customSort struct {
+	list todotxt.TaskList
+	by   func(t1, t2 *todotxt.Task) bool
+}
+
+func (c *customSort) Len() int {
+	return len(c.list)
+}
+
+func (c *customSort) Swap(l, r int) {
+	c.list[l], c.list[r] = c.list[r], c.list[l]
+}
+
+func (c *customSort) Less(l, r int) bool {
+	return c.by(&c.list[l], &c.list[r])
+}
+
+type By func(t1, t2 *todotxt.Task) bool
+
+func (by By) Sort(list []todotxt.Task) {
+	ts := &customSort{
+		list: list,
+		by:   by,
+	}
+	sort.Sort(ts)
+}
diff --git a/screen_main.go b/screen_main.go
index 7e8c84a..4c90c71 100644
--- a/screen_main.go
+++ b/screen_main.go
@@ -116,8 +116,7 @@ func (screen *MainScreen) reloadList(bundle termboxScreen.Bundle) error {
 				(*screen.displayList) = append(*screen.displayList, av)
 			}
 		}
-		screen.displayList.Sort(todotxt.SORT_CREATED_DATE_DESC)
-		screen.displayList.Sort(todotxt.SORT_PRIORITY_ASC)
+		By(app.AdvancedPrioritySort).Sort(*screen.displayList)
 	case MainBundleListDone:
 		if err := app.LoadDoneList(); err != nil {
 			return err