scripts: prevent awk from buffering the output

Author: darwin

scripts/lib/utils.sh

@@ -59,3 +59,16 @@ portable_realpath() {
       realpath "$@" ;;
   esac
 }
+
+portable_stdbuf() {
+  case "$OSTYPE" in
+    darwin*)
+      if [ -z "$(which gstdbuf)" ]; then
+        echo "gstdbuf needed under OSX, please \`brew install coreutils\`"
+        exit 1
+      fi
+      gstdbuf "$@" ;;
+    *)
+      stdbuf "$@" ;;
+  esac
+}

scripts/run-browser-tests.sh

@@ -6,6 +6,6 @@ false && source _config.sh # never executes, this is here just for IntelliJ Bash
 pushd "$ROOT"
 
 echo "Running browser tests..."
-lein with-profile +test-runner trampoline run -m "$@" 2>&1 | awk -f "$SCRIPTS/browser-tests-output-filter.awk"
+lein with-profile +test-runner trampoline run -m "$@" 2>&1 | portable_stdbuf -o0 awk -f "$SCRIPTS/browser-tests-output-filter.awk"
 
 popd