Added different sed command for Linux

Author: yrave

scripts/install.sh

@@ -162,11 +162,20 @@ printf -v PLACEHOLDER_REGEX_GIT_COMMIT_MESSAGES "%q" "$PLACEHOLDER_REGEX_GIT_COM
 PLACEHOLDER_REGEX_GIT_COMMIT_MESSAGES=$(printf -- "$PLACEHOLDER_REGEX_GIT_COMMIT_MESSAGES" | sed 's/\//\\\//g')
 PLACEHOLDER_NEW_COMMIT_MESSAGE=$(printf -- "$PLACEHOLDER_NEW_COMMIT_MESSAGE" | sed 's/\//\\\//g')
 
-sed -i '' "s/PLACEHOLDER_REGEX_COMMIT_ISSUE_NUMBER/\/${PLACEHOLDER_REGEX_COMMIT_ISSUE_NUMBER}\//g" "$HOOK_FILE"
-sed -i '' "s/PLACEHOLDER_REGEX_BRANCH_ISSUE_NUMBER/\/${PLACEHOLDER_REGEX_BRANCH_ISSUE_NUMBER}\//g" "$HOOK_FILE"
-sed -i '' "s/PLACEHOLDER_REGEX_GIT_COMMIT_MESSAGES/\/${PLACEHOLDER_REGEX_GIT_COMMIT_MESSAGES}\//g" "$HOOK_FILE"
-sed -i '' "s/PLACEHOLDER_LOGGING_VERBOSE/${PLACEHOLDER_LOGGING_VERBOSE}/g" "$HOOK_FILE"
-sed -i '' "s/PLACEHOLDER_NEW_COMMIT_MESSAGE/${PLACEHOLDER_NEW_COMMIT_MESSAGE}/g" "$HOOK_FILE"
+replace_placeholder_with_value () {
+	if [ $(uname -s) == "Linux" ]; then
+		sed -i "s/${1}/${2}/g" "$HOOK_FILE"
+		return
+	fi
+
+	sed -i '' "s/${1}/${2}/g" "$HOOK_FILE"
+}
+
+replace_placeholder_with_value PLACEHOLDER_REGEX_COMMIT_ISSUE_NUMBER "\/${PLACEHOLDER_REGEX_COMMIT_ISSUE_NUMBER}\/"
+replace_placeholder_with_value PLACEHOLDER_REGEX_BRANCH_ISSUE_NUMBER "\/${PLACEHOLDER_REGEX_BRANCH_ISSUE_NUMBER}\/"
+replace_placeholder_with_value PLACEHOLDER_REGEX_GIT_COMMIT_MESSAGES "\/${PLACEHOLDER_REGEX_GIT_COMMIT_MESSAGES}\/"
+replace_placeholder_with_value PLACEHOLDER_LOGGING_VERBOSE "${PLACEHOLDER_LOGGING_VERBOSE}"
+replace_placeholder_with_value PLACEHOLDER_NEW_COMMIT_MESSAGE "${PLACEHOLDER_NEW_COMMIT_MESSAGE}"
 
 printf -- " - Requesting permission to execute git hook...\n"
 chmod a+x "$HOOK_FILE"