fetch code from gist using gist api v3.

gist-fetcher.groovy

@Grab(group='commons-httpclient', module='commons-httpclient', version='3.1')

import org.apache.commons.httpclient.*
import org.apache.commons.httpclient.methods.*

import groovy.json.*


class GistFetcher {

	static String ENCODING='UTF-8'

	String getJsonString( String gistId ){

		def retVal = ''

		def gistUrl = "https://api.github.com/gists/${gistId}"

		def hc = new HttpClient()
		def method = new GetMethod( gistUrl )
		hc.executeMethod( method )
			
		def reader = new InputStreamReader( method.getResponseBodyAsStream(), ENCODING )
		retVal = reader.text
		reader.close()
			
		method.releaseConnection()

		retVal
	}

	Map getJsonObject( String gistId ){ new JsonSlurper().parseText( getJsonString(gistId) ) }

	String id
	String filename

	String getContent(){
		assert id!=null
		assert filename!=null
		getJsonObject(id).files."${filename}".content
	}

	String getType(){
		assert id!=null
		assert filename!=null
		getJsonObject(id).files."${filename}".type
	}
}


def id = '1174714'
def filename = 'MCanvas.java'

println new GistFetcher( id:id,filename:filename ).getType()
println new GistFetcher( id:id,filename:filename ).getContent()