improved shell

internal/cli/shell.go

@@ -2,12 +2,14 @@ package cli
 
 import (
 	"bufio"
+	"errors"
 	"fmt"
 	"log"
 	"os"
 	"strconv"
 	"strings"
 
+	"gitea.elara.ws/Hazel/music-kraken/internal/common/color"
 	"gitea.elara.ws/Hazel/music-kraken/internal/data"
 	"gitea.elara.ws/Hazel/music-kraken/internal/plugin"
 )
@@ -55,56 +57,93 @@ func printResults(musicObjects []data.MusicObject) {
 		}
 	}
 
+	fmt.Println()
 	fmt.Println(strings.Join(results, "\n"))
 	fmt.Println()
 }
 
+type musicObjectStore [][]data.MusicObject
+
+func (s musicObjectStore) currentMusicObjects() ([]data.MusicObject, error) {
+	if len(s) <= 0 {
+		return []data.MusicObject{}, errors.New("no items to select from")
+	}
+
+	return (s)[len(s)-1], nil
+}
+
+func interpretCommand(command string, store musicObjectStore) (musicObjectStore, error) {
+	// going back in history
+	if command == ".." {
+		if len(store) <= 1 {
+			return store, errors.New("can't go back")
+		}
+
+		return store[:len(store)-1], nil
+	}
+
+	// fetch special music object
+	if index, err := strconv.Atoi(command); err == nil {
+		currentMusicObjects, err := store.currentMusicObjects()
+		if err != nil {
+			return store, err
+		}
+
+		if index >= len(currentMusicObjects) || index < 0 {
+			return store, errors.New(command + " is out of bounds [0 <= " + strconv.Itoa(index) + " <= " + strconv.Itoa(len(currentMusicObjects)-1) + "]")
+		}
+
+		current := currentMusicObjects[index]
+
+		if len(current.GetSources()) <= 0 {
+			return store, errors.New("selected object has no sources to download")
+		}
+
+		currentMusicObjects, err = plugin.FetchList(current.GetSources()[0])
+		if err != nil {
+			return store, err
+		}
+
+		return append(store, currentMusicObjects), nil
+	}
+
+	// search in every other case
+	currentMusicObjects, err := plugin.Search(command, plugin.SearchConfig{IgnoreErrors: false})
+	if err != nil {
+		fmt.Println(err)
+		fmt.Println()
+	}
+
+	return append(store, currentMusicObjects), nil
+}
+
 func Shell() {
 	plugin.RegisterPlugin(&plugin.Musify{})
 
 	fmt.Println("== MusicKraken Shell ==")
 	fmt.Println()
 
-	currentMusicObjects := []data.MusicObject{}
+	store := musicObjectStore{}
+
 	for {
 		fmt.Print("> ")
 
 		reader := bufio.NewReader(os.Stdin)
-		line, err := reader.ReadString('\n')
+		command, err := reader.ReadString('\n')
 		if err != nil {
 			log.Fatal(err)
-			return
 		}
 
-		line = strings.TrimSpace(line)
-
-		if index, err := strconv.Atoi(line); err == nil {
-			if index >= len(currentMusicObjects) {
-				fmt.Println("\n" + line + " is out of bounds")
-				continue
-			}
-
-			current := currentMusicObjects[index]
-
-			if len(current.GetSources()) <= 0 {
-				fmt.Println("\nselected has no sources to download")
-				continue
-			}
-
-			currentMusicObjects, err = plugin.FetchList(current.GetSources()[0])
-			if err != nil {
-				fmt.Println(err)
-				fmt.Println()
-			}
-		} else {
-			currentMusicObjects, err = plugin.Search(line, plugin.SearchConfig{IgnoreErrors: false})
-			if err != nil {
-				fmt.Println(err)
-				fmt.Println()
-			}
+		store, err = interpretCommand(strings.TrimSpace(command), store)
+		if err != nil {
+			fmt.Println()
+			fmt.Println(color.Yellow + err.Error() + color.Reset)
+			fmt.Println()
 		}
 
-		fmt.Println()
-		printResults(currentMusicObjects)
+		currentMusicObject, err := store.currentMusicObjects()
+		if err == nil {
+			printResults(currentMusicObject)
+		}
 	}
 }

internal/common/color/color.go

@@ -0,0 +1,32 @@
+package color
+
+import (
+	"fmt"
+	"runtime"
+)
+
+var Reset = "\033[0m"
+var Red = "\033[31m"
+var Green = "\033[32m"
+var Yellow = "\033[33m"
+var Blue = "\033[34m"
+var Purple = "\033[35m"
+var Cyan = "\033[36m"
+var Gray = "\033[37m"
+var White = "\033[97m"
+
+func init() {
+	if runtime.GOOS == "windows" {
+		Reset = ""
+		Red = ""
+		Green = ""
+		Yellow = ""
+		Blue = ""
+		Purple = ""
+		Cyan = ""
+		Gray = ""
+		White = ""
+	}
+
+	fmt.Println("init")
+}