From b1fc3359eb7498236621d1aa6a9ff18f8cce73c0 Mon Sep 17 00:00:00 2001
From: Grant Ammons <gammons@gmail.com>
Date: Sun, 1 May 2016 19:17:54 -0400
Subject: Sort todos by due date by default

---
 todolist/app.go        | 16 ++++++++--------
 todolist/file_store.go | 12 ++++++++++++
 todolist/todo_item.go  | 12 ++++++++++++
 3 files changed, 32 insertions(+), 8 deletions(-)

diff --git a/todolist/app.go b/todolist/app.go
index 74fb8dc..267f482 100644
--- a/todolist/app.go
+++ b/todolist/app.go
@@ -36,6 +36,14 @@ func (a *App) DeleteTodo(input string) {
 	}
 }
 
+func (a *App) ListTodos(input string) {
+	//filtered := NewFilter(a.TodoStore.Todos()).filter()
+	grouped := a.getGroups(input)
+
+	formatter := NewFormatter(grouped)
+	formatter.Print()
+}
+
 func (a *App) getId(input string) int {
 
 	re, _ := regexp.Compile("\\d+")
@@ -47,14 +55,6 @@ func (a *App) getId(input string) int {
 	}
 }
 
-func (a *App) ListTodos(input string) {
-	//filtered := NewFilter(a.TodoStore.Todos()).filter()
-	grouped := a.getGroups(input)
-
-	formatter := NewFormatter(grouped)
-	formatter.Print()
-}
-
 func (a *App) getGroups(input string) *GroupedTodos {
 	grouper := &Grouper{}
 	contextRegex, _ := regexp.Compile(`by c.*$`)
diff --git a/todolist/file_store.go b/todolist/file_store.go
index 992aeb3..579bf17 100644
--- a/todolist/file_store.go
+++ b/todolist/file_store.go
@@ -6,6 +6,7 @@ import (
 	"io/ioutil"
 	"os"
 	"os/user"
+	"sort"
 )
 
 type FileStore struct {
@@ -73,7 +74,18 @@ func (f *FileStore) Save() {
 	}
 }
 
+type ByDate []Todo
+
+func (a ByDate) Len() int      { return len(a) }
+func (a ByDate) Swap(i, j int) { a[i], a[j] = a[j], a[i] }
+func (a ByDate) Less(i, j int) bool {
+	t1Due := a[i].CalculateDueTime()
+	t2Due := a[j].CalculateDueTime()
+	return t1Due.Before(t2Due)
+}
+
 func (f *FileStore) Todos() []Todo {
+	sort.Sort(ByDate(f.Data))
 	return f.Data
 }
 
diff --git a/todolist/todo_item.go b/todolist/todo_item.go
index cc06615..6b820b1 100644
--- a/todolist/todo_item.go
+++ b/todolist/todo_item.go
@@ -1,5 +1,7 @@
 package todolist
 
+import "time"
+
 type Todo struct {
 	Id        int      `json:"id"`
 	Subject   string   `json:"subject"`
@@ -17,3 +19,13 @@ func NewTodo() *Todo {
 func (t Todo) Valid() bool {
 	return (t.Subject != "")
 }
+
+func (t Todo) CalculateDueTime() time.Time {
+	if t.Due != "" {
+		parsedTime, _ := time.Parse("2006-01-02", t.Due)
+		return parsedTime
+	} else {
+		parsedTime, _ := time.Parse("2006-01-02", "1900-01-01")
+		return parsedTime
+	}
+}
-- 
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