helpers.sh: update to match main repo

ci/travis/helpers.sh

@@ -14,7 +14,6 @@ shopt -s extglob
 
 CYAN='\033[0;36m'
 MAGENTA='\033[1;35m'
-RED='\033[1;31m'
 NC='\033[0m' # no color
 
 # log command before running and add a blank line
@@ -30,14 +29,21 @@ ohai () {
   echo -e "${MAGENTA}>>>${NC} $*"
 }
 
-odie () {
-  echo -e "${RED}!!!${NC} $*"
-  exit 1
-}
-
 # print args as a cyan header
 header () {
   echo
   echo -e "${CYAN}$*${NC}"
   echo
 }
+
+modified_cask_files () {
+  if [[ -z "${MODIFIED_CASK_FILES+defined}" ]]; then
+    MODIFIED_CASK_FILES="$(git diff --name-only --diff-filter=AM "${TRAVIS_COMMIT_RANGE}" -- Casks/*.rb)"
+    export MODIFIED_CASK_FILES
+  fi
+  echo "${MODIFIED_CASK_FILES}"
+}
+
+any_casks_modified () {
+  [[ -n "$(modified_cask_files)" ]]
+}