WIP on a unified edit

This allows a unified edit functionality that supports the following:

**`t e 25 due tom`**

* Edits the due date
* Leaves subject, projects and contexts unchanged

**`t e 25 take out the trash with @bob`

* Updates the subject, projects and contexts
* Leaves the due date unchanged

**`t e 25 take out the trash with @bob due tom`

* Updates the subject, projects and contexts
* Updates the due date

**What's missing**

* Tests that exercise this functionality

1 files changed, 21 insertions, 32 deletions

diff --git a/todolist/app.go b/todolist/app.go
index 12cc39d..9fefd8e 100644
--- a/todolist/app.go
+++ b/todolist/app.go
@@ -3,8 +3,8 @@ package todolist
 import (
 	"fmt"
 	"regexp"
+	"strconv"
 	"strings"
-	"time"
 )
 
 type App struct {
@@ -91,38 +91,18 @@ func (a *App) UnarchiveTodo(input string) {
 	fmt.Println("Todo unarchived.")
 }
 
-func (a *App) EditTodoSubject(input string) {
+func (a *App) EditTodo(input string) {
 	a.Load()
-
-	p := Parser{input}
-	_, id, subject := p.Parse()
+	id, _ := a.getId(input)
 	if id == -1 {
 		return
 	}
+	parser := &Parser{}
 
-	_, todo := a.getId(input)
-	if todo == nil {
-		return
-	}
-
-	todo.Subject = subject
-	todo.Projects = p.Projects(subject)
-	todo.Contexts = p.Contexts(subject)
-
-	a.Save()
-	fmt.Println("Todo subject updated.")
-}
-
-func (a *App) EditTodoDue(input string) {
-	a.Load()
-	id, todo := a.getId(input)
-	if id == -1 {
-		return
+	if (parser.ParseEditTodo(a.TodoList.FindById(id), input)) {
+		a.Save()
+		fmt.Println("Todo updated.")
 	}
-	parser := &Parser{}
-	todo.Due = parser.Due(input, time.Now())
-	a.Save()
-	fmt.Println("Todo due date updated.")
 }
 
 func (a *App) ExpandTodo(input string) {
@@ -195,13 +175,22 @@ func (a *App) UnprioritizeTodo(input string) {
 }
 
 func (a *App) getId(input string) (int, *Todo) {
-	_, id, _ := Parser{input}.Parse()
-	todo := a.TodoList.FindById(id)
-	if todo == nil {
-		fmt.Println("No such id.")
+	re, _ := regexp.Compile("\\d+")
+	if re.MatchString(input) {
+		id, _ := strconv.Atoi(re.FindString(input))
+		todo := a.TodoList.FindById(id)
+		if todo == nil {
+			fmt.Println("No such id.")
+			return -1, nil
+
+		}
+		return id, todo
+
+	} else {
+		fmt.Println("Invalid id.")
 		return -1, nil
+
 	}
-	return id, todo
 }
 
 func (a *App) getGroups(input string, todos []*Todo) *GroupedTodos {