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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,119 @@ | ||
| package app | ||
|
|
||
| import ( | ||
| "context" | ||
| "os" | ||
| "os/signal" | ||
| "sync" | ||
| "syscall" | ||
|
|
||
| "github.com/gdamore/tcell/v2" | ||
| "github.com/rivo/tview" | ||
| ) | ||
|
|
||
| var ( | ||
| App *Application | ||
| Styles *Theme | ||
| ) | ||
|
|
||
| type Application struct { | ||
| *tview.Application | ||
|
|
||
| context context.Context | ||
| cancelFn context.CancelFunc | ||
| waitGroup sync.WaitGroup | ||
| } | ||
|
|
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| type Theme struct { | ||
| tview.Theme | ||
|
|
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| SidebarTitleBorderColor string | ||
| } | ||
|
|
||
| func init() { | ||
| ctx, cancel := context.WithCancel(context.Background()) | ||
|
|
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| App = &Application{ | ||
| Application: tview.NewApplication(), | ||
| context: ctx, | ||
| cancelFn: cancel, | ||
| } | ||
|
|
||
| App.register() | ||
| App.EnableMouse(true) | ||
| App.EnablePaste(true) | ||
|
|
||
| Styles = &Theme{ | ||
| Theme: tview.Theme{ | ||
| PrimitiveBackgroundColor: tcell.ColorDefault, | ||
| ContrastBackgroundColor: tcell.ColorBlue, | ||
| MoreContrastBackgroundColor: tcell.ColorGreen, | ||
| BorderColor: tcell.ColorWhite, | ||
| TitleColor: tcell.ColorWhite, | ||
| GraphicsColor: tcell.ColorGray, | ||
| PrimaryTextColor: tcell.ColorDefault.TrueColor(), | ||
| SecondaryTextColor: tcell.ColorYellow, | ||
| TertiaryTextColor: tcell.ColorGreen, | ||
| InverseTextColor: tcell.ColorWhite, | ||
| ContrastSecondaryTextColor: tcell.ColorBlack, | ||
| }, | ||
| SidebarTitleBorderColor: "#666A7E", | ||
| } | ||
|
|
||
| tview.Styles = Styles.Theme | ||
| } | ||
|
|
||
| // Context returns the application context. | ||
| func (a *Application) Context() context.Context { | ||
| return a.context | ||
| } | ||
|
|
||
| // Register adds a task to the wait group and returns a | ||
| // function that decrements the task count when called. | ||
| // | ||
| // The application will not stop until all registered tasks | ||
| // have finished by calling the returned function! | ||
| func (a *Application) Register() func() { | ||
| a.waitGroup.Add(1) | ||
| return a.waitGroup.Done | ||
| } | ||
|
|
||
| // Run starts and blocks until the application is stopped. | ||
| func (a *Application) Run(root *tview.Pages) error { | ||
| a.SetRoot(root, true) | ||
| return a.Application.Run() | ||
| } | ||
|
|
||
| // Stop cancels the application context, waits for all | ||
| // tasks to finish, and then stops the application. | ||
| func (a *Application) Stop() { | ||
| a.cancelFn() | ||
| a.waitGroup.Wait() | ||
| a.Application.Stop() | ||
| } | ||
|
|
||
| // register listens for interrupt and termination signals to | ||
| // gracefully handle shutdowns by calling the Stop method. | ||
| func (a *Application) register() { | ||
| c := make(chan os.Signal, 2) | ||
| signal.Notify(c, os.Interrupt, syscall.SIGTERM) | ||
|
|
||
| go func() { | ||
| <-c | ||
| a.Stop() | ||
| <-c | ||
| os.Exit(1) | ||
| }() | ||
|
|
||
| // Override the default input capture to listen for Ctrl+C | ||
| // and make it send an interrupt signal to the channel to | ||
| // trigger a graceful shutdown instead of closing the app | ||
| // immediately without waiting for tasks to finish. | ||
| a.SetInputCapture(func(event *tcell.EventKey) *tcell.EventKey { | ||
| if event.Key() == tcell.KeyCtrlC { | ||
| c <- os.Interrupt | ||
| return nil | ||
| } | ||
| return event | ||
| }) | ||
| } |
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