feat: abra server ls

WE DID IT! The first actual command to be ported.

Code is still a mess in terms of UX but its a milestone!

config/env.go

@@ -0,0 +1,49 @@
+package config
+
+import (
+	"fmt"
+	"io/fs"
+	"io/ioutil"
+	"log"
+	"os/user"
+
+	"github.com/joho/godotenv"
+)
+
+// TODO: envvar
+const ABRA_DIR = ".abra"
+
+var ABRA_SERVER_FOLDER = fmt.Sprintf("/%s/%s", ABRA_DIR, "servers")
+
+func getHomeDir() string {
+	// Future: Windows support?
+	user, err := user.Current()
+	if err != nil {
+		log.Fatalf(err.Error())
+	}
+	return user.HomeDir
+}
+
+func ReadServerNames() []string {
+	var serverNames []string
+	files, err := ioutil.ReadDir(getHomeDir() + ABRA_SERVER_FOLDER)
+	if err != nil {
+		log.Fatal(err.Error())
+	}
+	for _, file := range files {
+		// Check if file is directory or symlink to one
+		if file.IsDir() || file.Mode()&fs.ModeSymlink != 0 {
+			serverNames = append(serverNames, file.Name())
+		}
+	}
+	return serverNames
+}
+
+func ReadEnv(filePath string) map[string]string {
+	var envFile map[string]string
+	envFile, err := godotenv.Read(filePath)
+	if err != nil {
+		panic(err) // TODO: Better logging
+	}
+	return envFile
+}