feat: scroll effect and more choices

main.go

@@ -13,10 +13,12 @@ import (
 )
 
 // Define available characters for each part of the emoji
-var leftArms = []string{"٩", "∿", "☝", "<"}
-var rightArms = []string{"۶", "∿", "☝", ">"}
-var eyes = []string{"o", "O", "^", "◕", "•", "°", "ʘ"}
-var mouths = []string{"O", "‿", ".̫ ", "⊖", "ω", "ʖ"}
+var leftArms = []string{"٩", "∿", "☝", "<", "ヽ", "(", "へ", "ᕕ", "ノ"}
+var rightArms = []string{"۶", "∿", "☝", ">", "ﾉ", ")", "へ", "ᕗ", "ノ"}
+var eyes = []string{"o", "O", "^", "◕", "•", "°", "ʘ", "ʕ", "ಠ", "눈"}
+var mouths = []string{"O", "‿", ".̫ ", "⊖", "ω", "ʖ", "﹏", "▽", "益"}
+
+const maxVisibleOptions = 6
 
 func main() {
 	var rootCmd = &cobra.Command{
@@ -46,6 +48,8 @@ func showMainMenu() {
 	menuOptions := []string{"Create New Emoji", "Create Random Emoji", "Exit"}
 
 	selectedIndex := 0
+	startIndex := 0
+
 	for {
 		printBue(`
       ___         ___                       
@@ -61,7 +65,7 @@ func showMainMenu() {
      \/__/       \/__/      \/__/    \/__/  
 `)
 		fmt.Println("Select an option:")
-		displayOptions(menuOptions, selectedIndex)
+		displayOptions(menuOptions, selectedIndex, startIndex)
 
 		// Read the keyboard input
 		char, key, err := keyboard.GetKey()
@@ -75,10 +79,16 @@ func showMainMenu() {
 		case keyboard.KeyArrowUp:
 			if selectedIndex > 0 {
 				selectedIndex--
+				if selectedIndex < startIndex {
+					startIndex--
+				}
 			}
 		case keyboard.KeyArrowDown:
 			if selectedIndex < len(menuOptions)-1 {
 				selectedIndex++
+				if selectedIndex >= startIndex+maxVisibleOptions {
+					startIndex++
+				}
 			}
 		case keyboard.KeyEnter:
 			fmt.Print("\033[H\033[2J")
@@ -139,11 +149,12 @@ func createRandomEmoji() {
 
 func pickPart(options []string, message string) string {
 	selectedIndex := 0
+	startIndex := 0
 
 	for {
 		fmt.Println(message)
-		displayOptions(options, selectedIndex)
-
+		displayOptions(options, selectedIndex, startIndex)
+		printBue("move up or down to display more choices")
 		char, key, err := keyboard.GetKey()
 		if err != nil {
 			fmt.Println("Error reading key and char:", err, char)
@@ -154,10 +165,16 @@ func pickPart(options []string, message string) string {
 		case keyboard.KeyArrowUp:
 			if selectedIndex > 0 {
 				selectedIndex--
+				if selectedIndex < startIndex {
+					startIndex--
+				}
 			}
 		case keyboard.KeyArrowDown:
 			if selectedIndex < len(options)-1 {
 				selectedIndex++
+				if selectedIndex >= startIndex+maxVisibleOptions {
+					startIndex++
+				}
 			}
 		case keyboard.KeyEnter:
 			fmt.Print("\033[H\033[2J")
@@ -173,12 +190,18 @@ func pickPart(options []string, message string) string {
 	return options[selectedIndex]
 }
 
-func displayOptions(options []string, selectedIndex int) {
-	for i, option := range options {
+// displayOptions shows a window of maxVisibleOptions at a time
+func displayOptions(options []string, selectedIndex, startIndex int) {
+	endIndex := startIndex + maxVisibleOptions
+	if endIndex > len(options) {
+		endIndex = len(options)
+	}
+
+	for i := startIndex; i < endIndex; i++ {
 		if i == selectedIndex {
-			printSelected("> %s\n", option)
+			printSelected("> %s\n", options[i])
 		} else {
-			fmt.Printf("  %s\n", option)
+			fmt.Printf("  %s\n", options[i])
 		}
 	}
 }