Commit a simple CLI example for editing

main.go

@@ -1,9 +1,61 @@
 package main
 
-import "fmt"
+import (
+	"fmt"
+	"os"
+
+	"github.com/spf13/cobra"
+)
 
 // This function shows an example of how you would use this package
+var rootCmd = &cobra.Command{
+	Use:   "edit-cli",
+	Short: "A test CLI to showcase the editor package",
+	Run: func(cmd *cobra.Command, args []string) {
+		contents, err := os.ReadFile(filePathToEdit)
+		if err != nil {
+			fmt.Println("File reading error: ", err)
+			os.Exit(1)
+		}
+
+		// Run the editor
+		edited, _, err := Run(contents, filePathToEdit)
+		if err != nil {
+			fmt.Println("File editing error: ", err)
+			os.Exit(1)
+		}
+
+		// If changes, overwrite the existing file
+		// Open the file for writing, creating it if it doesn't exist
+		file, err := os.OpenFile(filePathToEdit, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0644)
+		if err != nil {
+			fmt.Println("Failed to open original file to update: ", err)
+			os.Exit(1)
+		}
+		defer file.Close()
+
+		// Write the content to the file
+		estr := string(edited)
+		_, err = file.WriteString(estr)
+		if err != nil {
+			fmt.Println("Failed to write content to file: ", err)
+			os.Exit(1)
+		}
+
+		fmt.Println(fmt.Sprintf("Successfully updated %q!", filePathToEdit))
+		os.Exit(0)
+	},
+}
+
+var filePathToEdit string
+
+func init() {
+	rootCmd.PersistentFlags().StringVar(&filePathToEdit, "file", "", "the file to edit")
+}
 
 func main() {
-	fmt.Println("Hello, world.")
+	if err := rootCmd.Execute(); err != nil {
+		fmt.Println(err)
+		os.Exit(1)
+	}
 }