#!/usr/bin/env bash

# bin/detect <build-dir>

[ "$BUILDPACK_XTRACE" ] && set -o xtrace

error() {

local c="2,999 s/^/ ! /"

# send all of our output to stderr

exec 1>&2

echo -e "\033[1;31m" # bold; red

echo -n " ! ERROR: "

# this will be fed from stdin

case $(uname) in

Darwin) sed -l "$c";; # mac/bsd sed: -l buffers on line boundaries

*) sed -u "$c";; # unix/gnu sed: -u unbuffered (arbitrary) chunks of data

esac

echo -e "\033[0m" # reset style

exit 1

}

if [ -f "$1/package.json" ]; then

echo 'Node.js'

exit 0

fi

if [[ -f "$1/.slugignore" ]] && grep -Fxq "package.json" "$1/.slugignore"; then

error << EOF

'package.json' listed in '.slugignore' file

The 'heroku/nodejs' buildpack is set on this application, but was

unable to detect a 'package.json' file. This is likely because

the '.slugignore' file is removing it before the build begins.

For more information, refer to the following documentation:

https://devcenter.heroku.com/articles/slug-compiler#ignoring-files-with-slugignore

EOF

elif [[ -f "$1/.gitignore" ]] && grep -Fxq "package.json" "$1/.gitignore"; then

error << EOF

'package.json' listed in '.gitignore' file

The 'heroku/nodejs' buildpack is set on this application, but was

unable to detect a 'package.json' file. This is likely because

the '.gitignore' file is preventing it from being checked in to

the git repo.

For more information, refer to the following documentation:

https://devcenter.heroku.com/articles/gitignore

EOF

else

error <<- EOF

Application not supported by 'heroku/nodejs' buildpack

The 'heroku/nodejs' buildpack is set on this application, but was

unable to detect a Node.js codebase.

A Node.js app on Heroku requires a 'package.json' at the root of

the directory structure.

If you are trying to deploy a Node.js application, ensure that this

file is present at the top level directory. This directory has the

following files:

$(ls -1p "$1")

If you are trying to deploy an application written in another

language, you need to change the list of buildpacks set on your

Heroku app using the 'heroku buildpacks' command.

For more information, refer to the following documentation:

https://devcenter.heroku.com/articles/buildpacks

https://devcenter.heroku.com/articles/nodejs-support#activation

EOF

fi

exit 1