Build With / Convert to haskell stack

[tjtaill]

Love your project I have some instructions on how to build it with stack that I would like to contribute here is the diff file.

diff --git a/.gitignore b/.gitignore
index 39b1c3e..602f7e7 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,3 +2,4 @@ dist
.cabal-sandbox
cabal.sandbox.config
tags
+.stack-work
\ No newline at end of file
diff --git a/BUILD.md b/BUILD.md
index f097166..035ce68 100644
--- a/BUILD.md
+++ b/BUILD.md
@@ -37,3 +37,11 @@ cabal install

make -C examples

+## Building with stack
+
+1. install haskell stack https://docs.haskellstack.org/en/stable/install_and_upgrade/
+2. run stack init
+3. run stack setup
+4. run stack build binary will be in .stack-work/**/bin/dataflow
+5. run stack install binary will be in ${HOME}/.local/bin/dataflow
diff --git a/stack.yaml b/stack.yaml
new file mode 100644
index 0000000..52fe5e4
--- /dev/null
+++ b/stack.yaml
@@ -0,0 +1,66 @@
+# This file was automatically generated by 'stack init'
+#
+# Some commonly used options have been documented as comments in this file.
+# For advanced use and comprehensive documentation of the format, please see:
+# https://docs.haskellstack.org/en/stable/yaml_configuration/
+
+# Resolver to choose a 'specific' stackage snapshot or a compiler version.
+# A snapshot resolver dictates the compiler version and the set of packages
+# to be used for project dependencies. For example:
+#
+# resolver: lts-3.5
+# resolver: nightly-2015-09-21
+# resolver: ghc-7.10.2
+#
+# The location of a snapshot can be provided as a file or url. Stack assumes
+# a snapshot provided as a file might change, whereas a url resource does not.
+#
+# resolver: ./custom-snapshot.yaml
+# resolver: https://example.com/snapshots/2018-01-01.yaml
+resolver: lts-14.27
+
+# User packages to be built.
+# Various formats can be used as shown in the example below.
+#
+# packages:
+# - some-directory
+# - https://example.com/foo/bar/baz-0.0.2.tar.gz
+# subdirs:
+# - auto-update
+# - wai
+packages:
+- .
+# Dependency packages to be pulled from upstream that are not in the resolver.
+# These entries can reference officially published versions as well as
+# forks / in-progress versions pinned to a git hash. For example:
+#
+# extra-deps:
+# - acme-missiles-0.3
+# - git: https://github.com/commercialhaskell/stack.git
+# commit: e7b331f14bcffb8367cd58fbfc8b40ec7642100a
+#
+# extra-deps: []
+
+# Override default flag values for local packages and extra-deps
+# flags: {}
+
+# Extra package databases containing global packages
+# extra-package-dbs: []
+
+# Control whether we use the GHC we find on the path
+# system-ghc: true
+#
+# Require a specific version of stack, using version ranges
+# require-stack-version: -any # Default
+# require-stack-version: ">=2.1"
+#
+# Override the architecture used by stack, especially useful on Windows
+# arch: i386
+# arch: x86_64
+#
+# Extra directories used by stack for building
+# extra-include-dirs: [/path/to/dir]
+# extra-lib-dirs: [/path/to/dir]
+#
+# Allow a newer minor version of GHC than the snapshot specifies
+# compiler-check: newer-minor
diff --git a/stack.yaml.lock b/stack.yaml.lock
new file mode 100644
index 0000000..e24dcac
--- /dev/null
+++ b/stack.yaml.lock
@@ -0,0 +1,12 @@
+# This file was autogenerated by Stack.
+# You should not edit this file by hand.
+# For more information, please see the documentation at:
+# https://docs.haskellstack.org/en/stable/lock_files
+
+packages: []
+snapshots:
+- completed:

• size: 524996
• url: https://raw.githubusercontent.com/commercialhaskell/stackage-snapshots/master/lts/14/27.yaml
• sha256: 7ea31a280c56bf36ff591a7397cc384d0dff622e7f9e4225b47d8980f019a0f0
• original: lts-14.27