fix: Check for user-provided build_opts (#71)

* fix: Check for user-provided `build_opts`

* chore: Simplify checking for build_opts

* chore: Some style fix

* chore: Further explain how to use `check_build_opts` function

build_opts_check.sh

@@ -5,21 +5,32 @@ set -euo pipefail
 # SQUASH_INPUT_VALUE
 # BUILD_OPTS
 
-if [ "$SQUASH_INPUT_VALUE" != "true" ]; then
-  if grep -qE '(-B)|(--build-driver)' <<< "$BUILD_OPTS"; then
-    echo 'Cannot provide --build-driver in build_opts while squash is set to true.'
-    exit 1
-  fi
+# check_build_opts "option1" "option2" "error_message"
+# If you have only 1 option to provide, provide '---' string as 2nd placeholder option
+# check_build_opts "option1" --- "error_message"
+check_build_opts() {
+    local option1="${1}"
+    local option2="${2}"
+    local error_message="${3}"
 
-  if grep -qE '(-s)|(--squash)' <<< "$BUILD_OPTS"; then
-    echo 'Cannot provide --squash in build_opts while squash is set to true.'
-    exit 1
-  fi
-fi
+    if [[ "${2}" == "---" ]]; then
+      if [[ -n "$(awk '/(^|\s)('${option1}')($|\s)/' <<< "${BUILD_OPTS}")" ]]; then
+        echo "${error_message}"
+        exit 1
+      fi
+    elif [[ -n "${2}" ]]; then
+      if [[ -n "$(awk '/(^|\s)('${option1}'|'${option2}')($|\s)/' <<< "${BUILD_OPTS}")" ]]; then
+        echo "${error_message}"
+        exit 1
+      fi
+    fi
+}
 
-if grep -qE '(-p)|(--push)' <<< "$BUILD_OPTS"; then
-  echo 'Please do not add --push to build_opts, as the action already provides that argument.'
-  exit 1
+if [[ "${SQUASH_INPUT_VALUE}" != "true" ]]; then
+  check_build_opts "-B" "--build-driver" "Cannot provide '--build-driver' in build_opts while 'squash' is set to true."
+  check_build_opts "-s" "--squash" "Cannot provide '--squash' in build_opts while 'squash' is set to true."
 fi
 
+check_build_opts "-p" "--push" "Please do not add '--push' to build_opts, as the action already provides that argument."
+
 exit 0