Better Resource Management

app_state.go

@@ -20,10 +20,17 @@ type AppState struct {
 	ValidOperations map[string][]string
 	OpFuncs         map[string]func([]string) int
 
+	mode ResourceId
+
 	TaskList *todotxt.TaskList
 	DoneList *todotxt.TaskList
 
+	taskListLoaded bool
+	doneListLoaded bool
+
 	screens []Screen
+
+	lang *Translator
 }
 
 func NewApp() *AppState {
@@ -41,8 +48,10 @@ func NewApp() *AppState {
 func (a *AppState) run(parms []string) int {
 	if len(parms) == 0 || parms[0] == "ui" {
 		// UI Mode
+		a.mode = ResModeUI
 		return uiLoop()
 	}
+	a.mode = ResModeCLI
 	if fn, ok := a.OpFuncs[parms[0]]; ok {
 		return fn(parms[1:])
 	}
@@ -117,6 +126,8 @@ func (a *AppState) migrate(from, to int) int {
 }
 
 func (a *AppState) initialize() {
+	a.initLanguage()
+
 	var err error
 	a.config, err = userConfig.NewConfig(a.Name)
 	if err != nil {

model.go

@@ -7,7 +7,36 @@ import (
 	todotxt "github.com/br0xen/go-todotxt"
 )
 
+// diskListChanged returns true if the task list in todo.txt
+// is different than what we have previously loaded.
+func (a *AppState) diskListChanged() bool {
+	if !a.taskListLoaded {
+		return false
+	}
+	curr, err := todotxt.LoadFromFilename(a.getTodoFile())
+	if err != nil {
+		return false
+	}
+	return curr.String() != a.TaskList.String()
+}
+
+// diskDoneListChanged returns true if the task list in done.txt
+// is different than what we have previously loaded.
+func (a *AppState) diskDoneListChanged() bool {
+	if !a.doneListLoaded {
+		return false
+	}
+	curr, err := todotxt.LoadFromFilename(a.getDoneFile())
+	if err != nil {
+		return false
+	}
+	return curr.String() != a.DoneList.String()
+}
+
 func (a *AppState) addTask(taskString string) error {
+	if a.diskListChanged() {
+		return a.e(ResStrListChanged)
+	}
 	t, err := todotxt.ParseTask(taskString)
 	if err != nil {
 		return err
@@ -20,6 +49,9 @@ func (a *AppState) addTask(taskString string) error {
 }
 
 func (a *AppState) toggleTaskComplete(id int) error {
+	if a.diskListChanged() {
+		return a.e(ResStrListChanged)
+	}
 	var task *todotxt.Task
 	var err error
 	if task, err = a.TaskList.GetTask(id); err != nil {
@@ -34,12 +66,15 @@ func (a *AppState) toggleTaskComplete(id int) error {
 }
 
 func (a *AppState) archiveTask(id int) error {
+	if a.diskListChanged() {
+		return a.e(ResStrListChanged)
+	}
 	var err error
 	var task *todotxt.Task
 	if task, err = a.TaskList.GetTask(id); err != nil {
 		return err
 	}
-	if err := a.TaskList.ArchiveTaskToFile(*task, app.getDoneFile()); err != nil {
+	if err := a.TaskList.ArchiveTaskToFile(*task, a.getDoneFile()); err != nil {
 		return err
 	}
 	a.TaskList.RemoveTask(*task)
@@ -47,6 +82,9 @@ func (a *AppState) archiveTask(id int) error {
 }
 
 func (a *AppState) unarchiveTask(id int) error {
+	if a.diskListChanged() {
+		return a.e(ResStrListChanged)
+	}
 	var err error
 	var task *todotxt.Task
 	if task, err = a.DoneList.GetTask(id); err != nil {
@@ -112,6 +150,7 @@ func (a *AppState) LoadTaskList() error {
 	var tl todotxt.TaskList
 	tl, err = todotxt.LoadFromFilename(a.getTodoFile())
 	a.TaskList = &tl
+	a.taskListLoaded = true
 	return err
 }
 
@@ -120,13 +159,20 @@ func (a *AppState) LoadDoneList() error {
 	var tl todotxt.TaskList
 	tl, err = todotxt.LoadFromFilename(a.getDoneFile())
 	a.DoneList = &tl
+	a.doneListLoaded = true
 	return err
 }
 
 func (a *AppState) WriteList() error {
+	if !a.taskListLoaded {
+		return a.e(ResStrTaskListNotLoaded)
+	}
 	return a.TaskList.WriteToFilename(a.getTodoFile())
 }
 
 func (a *AppState) WriteDoneList() error {
+	if !a.doneListLoaded {
+		return a.e(ResStrDoneListNotLoaded)
+	}
 	return a.DoneList.WriteToFilename(a.getDoneFile())
 }

resources.go

@@ -0,0 +1,79 @@
+package main
+
+import "errors"
+
+type ResourceId uint16
+
+type Translator struct {
+	values map[ResourceId]string
+}
+
+func NewTranslator() *Translator {
+	return &Translator{
+		values: make(map[ResourceId]string),
+	}
+}
+
+func (t *Translator) addString(res ResourceId, val string) {
+	t.values[res] = val
+	if _, ok := t.values[(res & 255)]; !ok {
+		t.values[(res & 255)] = val
+	}
+}
+
+func (t *Translator) getString(res ResourceId) (string, error) {
+	if v, ok := t.values[res]; ok {
+		return v, nil
+	}
+	// Couldn't pull the exact resource, try the basic one
+	if v, ok := t.values[(res & 255)]; ok {
+		return v, nil
+	}
+	return "", errors.New("String Resource Not Found")
+}
+
+const (
+	ResStrListChanged ResourceId = iota
+	ResStrTaskListNotLoaded
+	ResStrDoneListNotLoaded
+	ResStrInvalidRefreshRequest
+
+	ResModeCLI ResourceId = 1 << (iota + 9)
+	ResModeUI
+)
+
+func (a *AppState) initLanguage() {
+	a.lang = NewTranslator()
+
+	// Strings that are the same regardless of mode
+	a.lang.addString((ResStrTaskListNotLoaded), "Task list hasn't been loaded")
+	a.lang.addString((ResStrDoneListNotLoaded), "Done list hasn't been loaded")
+
+	// CLI Strings
+	a.lang.addString((ResStrListChanged | ResModeCLI), "List changed somewhere else")
+
+	// UI Strings
+	a.lang.addString((ResStrListChanged | ResModeUI), "List changed somewhere else, reload and try again (Ctrl+R)")
+}
+
+// s returns a string with the given stringId
+// (per the constants above)
+func (a *AppState) s(stringId ResourceId) string {
+	if stringId&255 != stringId {
+		// the attribute already has extended data in it.
+		if v, err := a.lang.getString(stringId); err == nil {
+			return v
+		}
+		return ""
+	}
+	if v, err := a.lang.getString((stringId | a.mode)); err == nil {
+		return v
+	}
+	return ""
+}
+
+// e is basically the same as 's', but returns
+// the string in an error object
+func (a *AppState) e(stringId ResourceId) error {
+	return errors.New(a.s(stringId))
+}

screen.go

@@ -1,6 +1,8 @@
 package main
 
 import (
+	"time"
+
 	termbox "github.com/nsf/termbox-go"
 )
 
@@ -49,15 +51,16 @@ func readUserInput(e chan termbox.Event) {
 	}
 }
 
-func refreshList(e chan termbox.Event) {
-	/*
+func checkForUpdate(e chan termbox.Event) {
 	for {
-			time.Sleep(5 * time.Minute)
-			app.LoadTasklist()
-			app.LoadDoneList()
-			e <- termbox.Event{Type: termbox.EventNone}
+		time.Sleep(time.Minute)
+		if app.diskListChanged() {
+			e <- termbox.Event{
+				Type: termbox.EventError,
+				Err:  app.e(ResStrListChanged),
+			}
+		}
 	}
-	*/
 }
 
 /*

screen_main.go

@@ -1,6 +1,7 @@
 package main
 
 import (
+	"errors"
 	"fmt"
 	"strings"
 	"time"
@@ -16,6 +17,8 @@ type MainScreen struct {
 	message        string
 	messageTimeout time.Duration
 	messageTime    time.Time
+	messageColorBg termbox.Attribute
+	messageColorFg termbox.Attribute
 	mode           int
 	cursor         map[string]int
 
@@ -64,6 +67,17 @@ func (screen *MainScreen) initialize(bundle Bundle) error {
 	return nil
 }
 
+func (screen *MainScreen) refreshList(bundle Bundle) error {
+	whichList := bundle.getString(MainBundleListKey, MainBundleListTodo)
+	switch whichList {
+	case MainBundleListTodo:
+		return app.LoadTaskList()
+	case MainBundleListDone:
+		return app.LoadDoneList()
+	}
+	return errors.New("Invalid refresh request.")
+}
+
 func (screen *MainScreen) reloadList(bundle Bundle) error {
 	// We add tasks to the display list using append because we want to persist task Ids
 	screen.displayList = todotxt.NewTaskList()
@@ -121,7 +135,7 @@ func (screen *MainScreen) handleKeyEvent(event termbox.Event) int {
 		// Go to About Screen
 		b := Bundle{}
 		if err := app.screens[ScreenAbout].initialize(b); err != nil {
-			screen.setMessage(err.Error())
+			screen.setErrorMessage(err.Error())
 		}
 		return ScreenAbout
 	} else if event.Key == termbox.KeyBackspace || event.Key == termbox.KeyBackspace2 {
@@ -149,7 +163,9 @@ func (screen *MainScreen) handleKeyEvent(event termbox.Event) int {
 		screen.cursor[screen.currentList] = len(*screen.displayList) - 1
 
 	} else if event.Key == termbox.KeyCtrlR {
-		screen.reloadList(screen.buildBundle(screen.currentList, screen.currentFilter))
+		b := screen.buildBundle(screen.currentList, screen.currentFilter)
+		screen.refreshList(b)
+		screen.reloadList(b)
 
 	} else if event.Key == termbox.KeyCtrlF {
 		// Jump forward half a screen
@@ -217,7 +233,7 @@ func (screen *MainScreen) handleInputKeyEvent(event termbox.Event) int {
 			// Create the new item
 			err := app.addTask(screen.inputField.GetValue())
 			if err != nil {
-				screen.setMessage(err.Error())
+				screen.setErrorMessage(err.Error())
 			}
 			screen.inputField.SetID("")
 			screen.inputField.SetValue("")
@@ -330,7 +346,7 @@ func (screen *MainScreen) drawFooter() {
 		screen.inputField.Draw()
 	}
 	// And the 'message'
-	termboxUtil.DrawStringAtPoint(screen.message, 0, height-1, DefaultFg, DefaultBg)
+	termboxUtil.DrawStringAtPoint(screen.message, 0, height-1, screen.messageColorFg, screen.messageColorBg)
 }
 
 func (screen *MainScreen) confirmArchiveItem() int {
@@ -353,20 +369,20 @@ func (screen *MainScreen) confirmArchiveItem() int {
 
 func (screen *MainScreen) archiveCurrentItem() int {
 	if screen.currentList != MainBundleListTodo {
-		screen.setMessage("Task is already archived")
+		screen.setErrorMessage("Task is already archived")
 		return ScreenMain
 	}
 	// Find the task under the cursor
 	if len(*screen.displayList) > screen.cursor[screen.currentList] {
 		t := (*screen.displayList)[screen.cursor[screen.currentList]]
 		if err := app.archiveTask(t.Id); err != nil {
-			screen.setMessage(err.Error())
+			screen.setErrorMessage(err.Error())
 			return ScreenMain
 		}
 		// Reload the list
 		b := screen.buildBundle(screen.currentList, screen.currentFilter)
 		if err := screen.reloadList(b); err != nil {
-			screen.setMessage(err.Error())
+			screen.setErrorMessage(err.Error())
 		}
 	}
 	return ScreenMain
@@ -374,20 +390,20 @@ func (screen *MainScreen) archiveCurrentItem() int {
 
 func (screen *MainScreen) unarchiveCurrentItem() int {
 	if screen.currentList == MainBundleListTodo {
-		screen.setMessage("Task is not archived")
+		screen.setErrorMessage("Task is not archived")
 		return ScreenMain
 	}
 	// Find the task under the cursor
 	if len(*screen.displayList) > screen.cursor[screen.currentList] {
 		t := (*screen.displayList)[screen.cursor[screen.currentList]]
 		if err := app.unarchiveTask(t.Id); err != nil {
-			screen.setMessage(err.Error())
+			screen.setErrorMessage(err.Error())
 			return ScreenMain
 		}
 		// Reload the list
 		b := screen.buildBundle(screen.currentList, screen.currentFilter)
 		if err := screen.reloadList(b); err != nil {
-			screen.setMessage(err.Error())
+			screen.setErrorMessage(err.Error())
 		}
 	}
 	return ScreenMain
@@ -401,7 +417,7 @@ func (screen *MainScreen) startEditTaskScreen() int {
 		b := Bundle{}
 		b.setValue(TaskBundleTaskIdKey, t.Id)
 		if err := app.screens[ScreenTask].initialize(b); err != nil {
-			screen.setMessage(err.Error())
+			screen.setErrorMessage(err.Error())
 			return ScreenMain
 		}
 		return ScreenTask
@@ -436,7 +452,7 @@ func (screen *MainScreen) startAddNewTask() int {
 
 func (screen *MainScreen) toggleTaskComplete() int {
 	if screen.currentList == MainBundleListDone {
-		screen.setMessage("Task is archived, unable to modify.")
+		screen.setErrorMessage("Task is archived, unable to modify.")
 		return ScreenMain
 	}
 
@@ -445,7 +461,7 @@ func (screen *MainScreen) toggleTaskComplete() int {
 		t := (*screen.displayList)[screen.cursor[screen.currentList]]
 		err := app.toggleTaskComplete(t.Id)
 		if err != nil {
-			screen.setMessage(err.Error())
+			screen.setErrorMessage(err.Error())
 			return ScreenMain
 		}
 	}
@@ -476,10 +492,20 @@ func (screen *MainScreen) startFilter() int {
 	return ScreenMain
 }
 
+func (screen *MainScreen) setErrorMessage(msg string) {
+	screen.message = " " + msg + " "
+	screen.messageTime = time.Now()
+	screen.messageTimeout = time.Second * 2
+	screen.messageColorBg = termbox.ColorRed
+	screen.messageColorFg = termbox.ColorWhite | termbox.AttrBold
+}
+
 func (screen *MainScreen) setMessage(msg string) {
 	screen.message = msg
 	screen.messageTime = time.Now()
 	screen.messageTimeout = time.Second * 2
+	screen.messageColorBg = DefaultBg
+	screen.messageColorFg = DefaultFg
 }
 
 /* setMessageWithTimeout lets you specify the timeout for the message
@@ -494,6 +520,8 @@ func (screen *MainScreen) setMessageWithTimeout(msg string, timeout time.Duratio
 func (screen *MainScreen) clearMessage() {
 	screen.message = fmt.Sprintf("%d Total Tasks", len(*screen.activeList))
 	screen.messageTimeout = -1
+	screen.messageColorBg = DefaultBg
+	screen.messageColorFg = DefaultFg
 }
 
 func (screen *MainScreen) buildBundle(list, filter string) Bundle {

ui_loop.go

@@ -25,6 +25,7 @@ func uiLoop() int {
 	app.layoutAndDrawScreen(displayScreen)
 	eventChan := make(chan termbox.Event)
 	go readUserInput(eventChan)
+	go checkForUpdate(eventChan)
 	for {
 		event := <-eventChan
 		if event.Type == termbox.EventKey {