#!/bin/bash

set -e

echo "TEST_AND_PUBLISH=1" >"$STATE"

# Avoid doing a full build if we can.  Note if the PR doesn't exist
# when the build is kicked off, we can't run this check so we do a
# full build.  Subsequent pushes to the same branch will have the desired behaviour
if [ -n "$CI_PULL_REQUEST" -a "$CI_PULL_REQUEST" = "$CI_PULL_REQUESTS" ]; then
    if PR=$(echo "$CI_PULL_REQUEST" | grep -oP '(?<=^https://github.com/weaveworks/weave/pull/)[0-9]+$'); then
        echo "GH_PR=$PR" >>"$STATE"
        if FILES=$(curl -s "https://api.github.com/repos/weaveworks/weave/pulls/$PR/files" | jq -r '.[]|.filename'); then
            echo "PR touches [$FILES]"
            if ! echo "$FILES" | grep -v ^site/; then
                echo "PR contains site changes only - skipping tests"
                echo "TEST_AND_PUBLISH=" >>"$STATE"
            else
                echo "PR contains non-site changes - running tests"
            fi
        else
            echo "Unable to get files for PR $PR" >&2
        fi
    else
        echo "Unable to extract PR number from $CI_PULL_REQUEST" >&2
    fi
fi

source "$STATE"

mkdir -p "$(dirname "$SRCDIR")" && cp -r "$(pwd)/" "$SRCDIR"

if [ -n "$TEST_AND_PUBLISH" ]; then
    cd "$SRCDIR"
    git submodule update --init
fi