Helpful Groovy Scripts

compare-list.groovy

/**
* Usage: groovy compare-list.groovy first.txt second.txt
**/

def sourceList = []

new File(  args[0] ).eachLine { line ->
    sourceList << line.trim()
}

def targetList = []
new File( args[1] ).eachLine { line ->
    targetList << line.trim()
}

List diff1 = (sourceList-targetList)
List diff2 = (targetList-sourceList)
List diff3 = sourceList.intersect(targetList)



println """
\n
println "################ COMPARE LIST #########################
\n
"""

println "- Total in sourceList: ${sourceList.size}"
println "- Total in targetList: ${targetList.size}"

println "\n\n**** Items in '${args[0]}' not in '${args[1]}' list: ${diff1.size} ****\n"
diff1.each { println "\t${it}" }


println "\n\n**** Items in '${args[1]}' not in '${args[0]}' list: ${diff2.size} ****\n"
diff2.each { println "\t${it}" }


println "\n\n***** Common items: ${diff3.size} *****\n"

diff3.each { println "\t${it}" }

println """
\n
######################################################
\n
"""

distinct-list.groovy

/**
* Usage: groovy distinct-list.groovy input.txt
*/

def sourceList = []

new File (  args[0] ).eachLine { line ->
    sourceList << line.trim()
}

Set<String> set = new HashSet<String>();

sourceList.each {    
    set.add(it);
}

println """
\n
################ DISTINCT LIST #########################
\n
"""

set.each {    
    println it
}


println """
\n
Original Entries: ${sourceList.size()}
Distinct Entries: ${set.size()}
\n
######################################################
\n
"""

print-csv.groovy

/**
* Usage: groovy print-csv.groovy input.txt
*/

def sourceList = []

new File (  args[0] ).eachLine { line ->
    sourceList << line.trim()
}

// This part ignores any items after colon. If you have host1:port1, host2:port2 you will get host1,host2 in CSV print.
// comment out the use of this function if it doesnt apply to you
def processEachEntry = { e -> 
    def length = e.split(":").length
    if(length == 1)
        return e;
    else if (length == 2)
        return e.split(":")[0]
    else
        throw new RuntimeException("Invalid entry - " + length + ' '  + e) // wont accept more than 1 colons
}

def updatedList = sourceList.collect { processEachEntry(it) }


print """
\n
############## PRINT CSV ############################
\n
${updatedList.join(",")}
\n
Total entries: ${updatedList.size()}\n
\n
######################################################
\n
"""