Simplify view and edit command (#184)

* Simplify the view command

* Simplify the edit command

* Migrate number-only book names

* Run migration

* Simplify remove

* Print note info when adding, editing, or removing

* Disallow users from editing or removing already removed notes

cli/utils/utils.go

@@ -26,6 +26,7 @@ import (
 	"net/http"
 	"os"
 	"path/filepath"
+	"regexp"
 	"strings"
 	"syscall"
 
@@ -248,3 +249,15 @@ func CopyFile(src, dest string) error {
 
 	return nil
 }
+
+// regexNumber is a regex that matches a string that looks like an integer
+var regexNumber = regexp.MustCompile(`^\d+$`)
+
+// IsNumber checks if the given string is in the form of a number
+func IsNumber(s string) bool {
+	if s == "" {
+		return false
+	}
+
+	return regexNumber.MatchString(s)
+}