add shell script to download artifacts from ci

Author: etpinard

.circleci/download_artifacts.sh

@@ -0,0 +1,31 @@
+#! /bin/bash
+#
+# https://circleci.com/docs/2.0/artifacts/#downloading-all-artifacts-for-a-build-on-circleci
+
+if [[ $# -eq 0 ]] ; then
+    echo 'Must provide Circle CI built number'
+    echo 'Go to https://circleci.com/gh/plotly/plotly.js to find out'
+    exit 1
+fi
+
+if [[ -z "${CIRCLECI_TOKEN}" ]]; then
+    echo 'CIRCLECI_TOKEN environment variable must be set'
+    echo 'Go to https://circleci.com/account/api to generate an access token'
+    exit 1
+fi
+
+BUILT=$1
+URL="https://circleci.com/api/v1.1/project/github/plotly/plotly.js/$BUILT/artifacts?circle-token=$CIRCLECI_TOKEN"
+DIR="$(dirname $0)/../build/circleci-artifacts-$BUILT"
+
+mkdir -p $DIR/{test_images,test_images_diff}
+
+FILES=$(curl -s $URL | grep -o 'https://[^"]*')
+
+for f in $FILES; do
+    if [[ $f == *"/test_images/"* ]]; then
+        wget $f %$CIRCLECI_TOKEN -q --show-progress -P $DIR/test_images
+    elif [[ $f == *"/test_images_diff/"* ]]; then
+        wget $f %$CIRCLECI_TOKEN -q --show-progress -P $DIR/test_images_diff
+    fi
+done