add AltKefunc in constants` pkg, add send and receive ui handlers

constants/constants.go

@@ -69,3 +69,12 @@ func CtrlKey() string {
 		return "ctrl"
 	}
 }
+
+func AltKey() string {
+	// if os is macos, then return "⌥"
+	if runtime.GOOS == "darwin" {
+		return "⌥"
+	} else {
+		return "alt"
+	}
+}

internal/tui/sr-ui.go

@@ -0,0 +1,85 @@
+package tui
+
+import (
+	"fmt"
+	"sort"
+	"time"
+	"strings"
+
+	"github.com/abdfnx/tran/constants"
+	"github.com/charmbracelet/bubbles/spinner"
+)
+
+type UIUpdate struct {
+	Progress float32
+}
+
+type FileInfoMsg struct {
+	FileNames []string
+	Bytes     int64
+}
+
+type ErrorMsg struct {
+	Message string
+}
+
+type ProgressMsg struct {
+	Progress float32
+}
+
+type FinishedMsg struct {
+	Files       []string
+	PayloadSize int64
+}
+
+var WaitingSpinner = spinner.Dot
+
+var CompressingSpinner = spinner.Globe
+
+var TransferSpinner = spinner.Spinner{
+	Frames: []string{"»  ", "»» ", "»»»", "   "},
+	FPS:    time.Millisecond * 400,
+}
+
+var ReceivingSpinner = spinner.Spinner{
+	Frames: []string{"   ", "  «", " ««", "«««"},
+	FPS:    time.Second / 2,
+}
+
+func TopLevelFilesText(fileNames []string) string {
+	// parse top level file names and attach number of subfiles in them
+	topLevelFileChildren := make(map[string]int)
+
+	for _, f := range fileNames {
+		fileTopPath := strings.Split(f, "/")[0]
+
+		subfileCount, wasPresent := topLevelFileChildren[fileTopPath]
+
+		if wasPresent {
+			topLevelFileChildren[fileTopPath] = subfileCount + 1
+		} else {
+			topLevelFileChildren[fileTopPath] = 0
+		}
+	}
+
+	// read map into formatted strings
+	var topLevelFilesText []string
+
+	for fileName, subFileCount := range topLevelFileChildren {
+		formattedFileName := fileName
+
+		if subFileCount > 0 {
+			formattedFileName = fmt.Sprintf("%s (%d subfiles)", fileName, subFileCount)
+		}
+
+		topLevelFilesText = append(topLevelFilesText, formattedFileName)
+	}
+
+	sort.Strings(topLevelFilesText)
+
+	return strings.Join(topLevelFilesText, ", ")
+}
+
+func GracefulUIQuit() {
+	time.Sleep(constants.SHUTDOWN_PERIOD)
+}