feat: use bubbletea framework

- implement TUI in bubbletea
  - split components into separate files
- remove now unused functions
- restructure files

cmd/client/app.go

@@ -0,0 +1,92 @@
+package client
+
+import (
+	"flag"
+	"github.com/charmbracelet/log"
+
+	"git.smsvc.net/pomodoro/ChronoTomato/internal/helper"
+	"git.smsvc.net/pomodoro/ChronoTomato/internal/websocket"
+	ChronoTomato "git.smsvc.net/pomodoro/ChronoTomato/pkg/models"
+	GoTomato "git.smsvc.net/pomodoro/GoTomato/pkg/models"
+
+	"github.com/charmbracelet/bubbles/help"
+	tea "github.com/charmbracelet/bubbletea"
+)
+
+var (
+	config ChronoTomato.Config
+	client websocket.Client
+)
+
+type app struct {
+	keys     keyMap
+	help     help.Model
+	channel  chan GoTomato.ServerMessage
+	pomodoro GoTomato.ServerMessage
+}
+
+func myApp() app {
+	return app{
+		keys:     keys,
+		help:     help.New(),
+		channel:  make(chan GoTomato.ServerMessage),
+		pomodoro: GoTomato.ServerMessage{},
+	}
+}
+
+// Wait for channel signal and return the ServerMessage as a tea.Msg.
+// Return tea.Quit() if the channel has been closed.
+// Excapsulate all this in a tea.Cmd() because bubbletea demands it.
+func (a app) waitForChannelSignal() tea.Cmd {
+	return func() tea.Msg {
+		content, open := <-a.channel
+		if !open {
+			return tea.Quit()
+		}
+		return content
+	}
+}
+
+func (a app) Init() tea.Cmd {
+	client = websocket.Connect(config.URL)
+	client.Password = config.Password
+	go client.ProcessServerMessages(a.channel)
+
+	return tea.Batch(
+		tea.ClearScreen,
+		a.waitForChannelSignal(),
+	)
+}
+
+func Start() {
+	var (
+		defaultConfigFile = "~/.config/ChronoTomato.yml"
+
+		parameter_url      = flag.String("url", "", "GoTomato Server URL (eg ws://localhost:8080/ws)")
+		parameter_password = flag.String("password", "", "Control password for pomodoro session")
+		configfile         = flag.String("config", "", "Path to config file")
+	)
+	flag.Parse()
+
+	// read passed config file or try to use default config
+	if *configfile != "" {
+		config = helper.ParseConfig(*configfile)
+	} else {
+		if helper.FileExists(defaultConfigFile) {
+			config = helper.ParseConfig(defaultConfigFile)
+		}
+	}
+
+	// cli parameters always supersede config file
+	if *parameter_url != "" {
+		config.URL = *parameter_url
+	}
+	if *parameter_password != "" {
+		config.Password = *parameter_password
+	}
+
+	_, err := tea.NewProgram(myApp()).Run()
+	if err != nil {
+		log.Fatal("Could not start program:", "msg", err)
+	}
+}