Support parallelism on Circle

circle.yml

@@ -40,14 +40,8 @@ dependencies:
 
 test:
   override:
-    - ./node_modules/.bin/gulp lint
-    - ./node_modules/.bin/gulp flow
-    - ./scripts/circleci/test_coverage.sh
-    - ./scripts/circleci/test_fiber.sh
-    - ./scripts/circleci/test_html_generation.sh
-    - ./scripts/circleci/track_stats.sh
-    - ./node_modules/.bin/grunt build
-    - ./node_modules/.bin/gulp react:extract-errors
+    - ./scripts/circleci/test_entry_point.sh:
+        parallel: true
 
 deployment:
   staging:

scripts/circleci/test_entry_point.sh

@@ -0,0 +1,66 @@
+#!/bin/bash
+
+set -e
+
+COMMANDS_TO_RUN=()
+
+# We split these to be approximately equal chunks of four. As of this writing,
+# times were around:
+# - 3:30 test_coverage.sh
+# - 2:00 test_fiber.sh
+# - 1:15 test_html_generation.sh
+# - 1:15 grunt build
+# with everything else < 0:30.
+
+if [ $((1 % CIRCLE_NODE_TOTAL)) -eq "$CIRCLE_NODE_INDEX" ]; then
+  COMMANDS_TO_RUN+=('./scripts/circleci/test_coverage.sh')
+fi
+
+if [ $((2 % CIRCLE_NODE_TOTAL)) -eq "$CIRCLE_NODE_INDEX" ]; then
+  COMMANDS_TO_RUN+=('./scripts/circleci/test_fiber.sh')
+fi
+
+if [ $((3 % CIRCLE_NODE_TOTAL)) -eq "$CIRCLE_NODE_INDEX" ]; then
+  COMMANDS_TO_RUN+=('./scripts/circleci/test_html_generation.sh')
+fi
+
+# These seem out of order but extract-errors must be run after jest.
+if [ $((0 % CIRCLE_NODE_TOTAL)) -eq "$CIRCLE_NODE_INDEX" ]; then
+  COMMANDS_TO_RUN+=('./node_modules/.bin/gulp lint')
+  COMMANDS_TO_RUN+=('./node_modules/.bin/gulp flow')
+  COMMANDS_TO_RUN+=('./node_modules/.bin/grunt build')
+  COMMANDS_TO_RUN+=('./scripts/circleci/test_extract_errors.sh')
+  COMMANDS_TO_RUN+=('./scripts/circleci/track_stats.sh')
+fi
+
+RETURN_CODES=()
+FAILURE=0
+
+printf "Node #%s (%s total). " "$CIRCLE_NODE_INDEX" "$CIRCLE_NODE_TOTAL"
+if [ -n "${COMMANDS_TO_RUN[0]}" ]; then
+  echo "Preparing to run commands:"
+  for cmd in "${COMMANDS_TO_RUN[@]}"; do
+    echo "- $cmd"
+  done
+
+  for cmd in "${COMMANDS_TO_RUN[@]}"; do
+    echo
+    echo "$ $cmd"
+    set +e
+    $cmd
+    rc=$?
+    set -e
+    RETURN_CODES+=($rc)
+    if [ $rc -ne 0 ]; then
+      FAILURE=$rc
+    fi
+  done
+
+  echo
+  for i in "${!COMMANDS_TO_RUN[@]}"; do
+    echo "Received return code ${RETURN_CODES[i]} from: ${COMMANDS_TO_RUN[i]}"
+  done
+  exit $FAILURE
+else
+  echo "No commands to run."
+fi

scripts/circleci/test_extract_errors.sh

@@ -0,0 +1,6 @@
+#!/bin/bash
+
+set -e
+
+./node_modules/.bin/gulp react:extract-errors
+git checkout -- scripts/error-codes/codes.json