From 525bec70a24c40d6e1044cbc731609d55b45b6cc Mon Sep 17 00:00:00 2001
From: Sam Darwin <samuel.d.darwin@gmail.com>
Date: Wed, 22 Jan 2025 09:40:13 -0700
Subject: [PATCH] antora_docs: cross-platform compatible scripts (#396)

---
 libdoc.sh | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/libdoc.sh b/libdoc.sh
index 2507943..0c83cb5 100755
--- a/libdoc.sh
+++ b/libdoc.sh
@@ -41,7 +41,8 @@ if [ -z "$node_version" ]; then
   echo "Node.js is not installed"
   exit 1
 fi
-major_version=$(echo "$node_version" | egrep -o "v([0-9]+)\." | cut -c 2- | rev | cut -c 2- | rev)
+major_version=$(echo "$node_version" | sed -n -E "s/v([0-9]+)\..*$/\1/p")
+echo "Node major version is $major_version"
 if [ "$major_version" -lt "16" ]; then
   echo "Node.js version $node_version is not supported. Please upgrade to version 16 or higher."
   node_path=$(which node)
@@ -67,7 +68,7 @@ fi
 
 if command -v git >/dev/null && git rev-parse --is-inside-work-tree >/dev/null 2>&1; then
   commit_id=$(git rev-parse HEAD)
-  commit_id=$(expr substr "$commit_id" 1 7)
+  commit_id=$(echo "$commit_id" | sed -n -E "s/^(.{7}).*$/\1/p")
 else
   commit_id=""
 fi