From d41dd0665fcb8d7d5aaadfcfe60a9ff635fe89ec Mon Sep 17 00:00:00 2001
From: Danny Bautista <pyrolagus@nerdpol.ch>
Date: Fri, 7 Jun 2019 13:46:37 -0400
Subject: [PATCH] Add check_arg to sync-ebooks.

---
 scripts/sync-ebooks | 14 ++++++++------
 1 file changed, 8 insertions(+), 6 deletions(-)

diff --git a/scripts/sync-ebooks b/scripts/sync-ebooks
index f83c6bf7..b1d7b39e 100755
--- a/scripts/sync-ebooks
+++ b/scripts/sync-ebooks
@@ -24,6 +24,12 @@ EOF
 }
 die(){ printf "\033[0;7;31mError:\033[0m %s\n" "${1}" 1>&2; exit 1; }
 require(){ command -v "$1" > /dev/null 2>&1 || { suggestion=""; if [ -n "$2" ]; then suggestion=" $2"; fi; die "$1 is not installed.${suggestion}"; } }
+
+check_arg() {
+	case "$2" in
+		''|$1) die "$3" ;;
+	esac
+}
 # End boilerplate
 
 require "git" "Try: apt-get install git"
@@ -56,16 +62,12 @@ while [ $# -gt 0 ]; do
 			shift 1
 			;;
 		--verbosity)
-			case "$2" in
-				''|*[!0-9]*) die "Verbosity is not an integer." ;;
-			esac
+			check_arg '*[!0-9]*' "$2" "Verbosity is not a positive integer."
 			verbosity="$2"
 			shift 2
 			;;
 		--token)
-			case "$2" in
-				''|*[!0-9a-zA-Z]*) die "Token is empty or contains illegal characters." ;;
-			esac
+			check_arg '*[!0-9a-zA-Z]*' "$2" "Token is empty or contains illegal characters."
 			githubToken="$2"
 			shift 2
 			;;