From 26f34a767b837e8d3db846138a3ef89144e3d6d8 Mon Sep 17 00:00:00 2001
From: "B. Petersen" <r10s@b44t.com>
Date: Sun, 9 Jan 2022 16:08:26 +0100
Subject: [PATCH] be more tolerant on PACKAGE_NAME argument

when a package name is given to `create-xdc.sh`,
this may be just a copy+pasted filename.
that, however, results in double `.xdc` extensions.

this pr accepts PACKAGE_NAME with or without .xdc extensions,
of course, when creating the final ZIP, .xdc is always added,
however only once :)

moreover, this pr documents the weird string manipulation commands.
---
 create-xdc.sh | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/create-xdc.sh b/create-xdc.sh
index 5bfc778..66b4702 100755
--- a/create-xdc.sh
+++ b/create-xdc.sh
@@ -6,10 +6,10 @@ case "$1" in
         exit
         ;;
     "")
-        PACKAGE_NAME=${PWD##*/}
+        PACKAGE_NAME=${PWD##*/} # '##*/' removes everything before the last slash and the last slash
         ;;
     *)
-        PACKAGE_NAME=$1
+        PACKAGE_NAME=${1%.xdc} # '%.xdc' removes the extension and allows PACKAGE_NAME to be given with or without extension
         ;;
 esac