Counts the number of tagged questions on Stackoverflow for a given tag.

StackoverflowTagCounter.groovy

@Grab(group='org.ccil.cowan.tagsoup', module='tagsoup', version='1.2')
import java.text.*

class SOTagCounter {
    def parser = new XmlSlurper(new org.ccil.cowan.tagsoup.Parser())

    int count(String tag) {
        new URL("http://stackoverflow.com/questions/tagged/${new URI(tag).path}").withReader { page ->
            def html = parser.parse(page)
            def c = html.body.div.find { it.@class == 'container' }.div.find { it.@id == 'content' }.div.find { it.@id == 'sidebar' }.div.find { it.@class == 'module' }.div[0].text()
            c ? new DecimalFormat('#,###').parse(c) : 0
        }
    }
}

def a = new SOTagCounter()

assert a.count('java') > a.count('c#')
assert a.count('svn') < a.count('git')
assert a.count('groovy') >= 10_000 // woot

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