node no longer a submodule

stack does a deep clone of all submodules when nodejs-exec is used as a dependency,
which takes a looong time.

now it isn't cloned if it is already installed, and when it is cloned it is only a shallow (must faster) clone.

.gitignore

@@ -1,2 +1,4 @@
 .stack-work
-/dist
+/dist
+/bin
+/node

Setup.hs

@@ -10,7 +10,7 @@ import System.Directory
 import System.FilePath ((</>))
 
 nodeRelPath :: FilePath
-nodeRelPath = "node/node"
+nodeRelPath = "bin/node"
 
 buildNode :: Verbosity -> IO ()
 buildNode verbosity =

build_node.sh

@@ -1,18 +1,22 @@
 #!/bin/bash
 
+mkdir -p bin
+
 # adapted from https://apple.stackexchange.com/a/123408/11374
 function version { echo "${@//v}" | awk -F. '{ printf("%d%03d%03d%03d\n", $1,$2,$3,$4); }'; }
 
 NODE_VERSION=`node --version`
 
 if [ $(version "$NODE_VERSION") -ge $(version "v6.2.1") ]; then
     echo "Using existing system node $NODE_VERSION"
-    cp `which node` node/node
+    cp `which node` bin/node
 else
     echo "Building nodejs from source"
     # node not available or too old. Build from source.
-    git submodule update --init --recursive
+    git clone --depth 1 -b v6.11.3 https://github.com/nodejs/node.git
     cd node
     ./configure --prefix=/tmp
     make -j4
+    cd ..
+    cp node/node bin/node
 fi

nodejs-exec.cabal

@@ -12,7 +12,7 @@ copyright:           2016 Yair
 category:            Foreign
 build-type:          Custom
 cabal-version:       >=1.8
-data-files:          node/node
+data-files:          bin/node
 
 library
   hs-source-dirs:      src