make libzmq build stage a script

so it's reusable outside Travis

next step: run it as prepublish prior to build

Author: minrk

.gitignore

@@ -11,3 +11,4 @@ binding.Makefile
 binding.target.gyp.mk
 gyp-mac-tool
 out/
+zmq

.travis.yml

@@ -30,20 +30,7 @@ before_install:
  - npm --version
  - test "$(uname)" = "Darwin"  || export CXX=g++-4.8 CC=gcc-4.8
  - gcc --version
- - mkdir zmq
- - export ZMQ_PREFIX=`pwd`/zmq
- - export CFLAGS=-fPIC
- - export CXXFLAGS=-fPIC
- - export PKG_CONFIG_PATH=$ZMQ_PREFIX/lib/pkgconfig
- - echo $PKG_CONFIG_PATH
- - wget https://github.com/zeromq/zeromq4-1/archive/$ZMQ.tar.gz -O zeromq-$ZMQ.tar.gz
- - tar xzvf zeromq-$ZMQ.tar.gz
- - cd zeromq4-1-$ZMQ
- - ./autogen.sh
- - ./configure --prefix=$ZMQ_PREFIX --with-tweetnacl --with-relaxed --enable-static --disable-shared
- - V=1 make -j
- - make install
- - cd ..
+ - sh build_libzmq.sh
 
 install: env PKG_CONFIG_PATH=$ZMQ_PREFIX/lib/pkgconfig npm install
 

build_libzmq.sh

@@ -0,0 +1,25 @@
+#!/bin/sh
+set -e
+
+test -d zmq || mkdir zmq
+
+export ZMQ=b539733cee0f47f9bf1a70dc7cb7ff20410d3380 # zeromq-4.1.5 prerelease for tweetnacl support
+realpath() {
+    [[ $1 = /* ]] && echo "$1" || echo "$PWD/${1#./}"
+}
+export ZMQ_PREFIX="$(dirname $(realpath $0))/zmq"
+export ZMQ_SRC_DIR=zeromq4-1-$ZMQ
+cd $ZMQ_PREFIX
+
+export CFLAGS=-fPIC
+export CXXFLAGS=-fPIC
+export PKG_CONFIG_PATH=$ZMQ_PREFIX/lib/pkgconfig
+
+test -f zeromq-$ZMQ.tar.gz || wget https://github.com/zeromq/zeromq4-1/archive/$ZMQ.tar.gz -O zeromq-$ZMQ.tar.gz
+test -d $ZMQ_SRC_DIR || tar xzf zeromq-$ZMQ.tar.gz
+cd $ZMQ_SRC_DIR
+
+test -f configure || ./autogen.sh
+./configure --prefix=$ZMQ_PREFIX --with-tweetnacl --with-relaxed --enable-static --disable-shared
+V=1 make -j
+make install