Grails script and passing parameters using Groovy CLIBuilder?

Question

I have created a very simple script and would like to pass arguments to the script.

like:

grails> helloworld -n Howdy
grails> helloworld -name Howdy

with the script:

target(main: 'Hello World') {
    def cli = new CliBuilder()
    cli.with
            {
                h(longOpt: 'help', 'Help - Usage Information')
                n(longOpt: 'name', 'Name to say hello to', args: 1, required: true)
            }
    def opt = cli.parse(args)
    if (!opt) return
    if (opt.h) cli.usage()
    println "Hello ${opt.n}"
}

I seem to fail in every attempt that i do. The script keeps complain about the -n option being not present.

When i debug the script the value op the args parameters looks like the values are rearranged.

When calling the script with :

grails> helloworld -n Howdy

the value of args inside the script is: Howdy -n

What am i missing here of doing wrong? Any suggestions?

Archer · Accepted Answer · 2013-01-12 13:20:11Z

1

Your problem is that you're running your code through grails shell. I've converted your code to CLI.groovy like this:

class CLI{
 public static void main(String [] args){
     def cli = new CliBuilder()
     cli.with
            {
                h(longOpt: 'help', 'Help - Usage Information')
                n(longOpt: 'name', 'Name to say hello to', args: 1, required: true)
             }
      def opt = cli.parse(args)
      if (!opt) return
      if (opt.h) cli.usage()
      println "Hello ${opt.n}"
      }
 }

After that I'm using groovy command to run it from linux shell like that:

 archer@capitan $ groovy CLI -n Daddy

It outputs:

 archer@capitan $ groovy CLI -n Daddy
 Hello Daddy

So it works like a charm.

answered Jan 12, 2013 at 13:20

Archer

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2 Comments

Marco Over a year ago

Thanks for your explanation! But i need this inside the grails shell, i am trying to use the parameters for some grails script i want to adjust.

Archer Over a year ago

I'm not sure you can pass parameters from within grails shell

mnd · Accepted Answer · 2014-10-28 19:43:18Z

I did a Google search for site:github.com grailsScript CliBuilder and came across:

https://github.com/Grails-Plugin-Consortium/grails-cxf/blob/master/scripts/WsdlToJava.groovy

That gave me the hint that the args variable needs to be formatted. Unfortunately it mutates -n Howdy into Howdy\n-n (not sure why the order is rearranged or the newline character is added).

The github page above has a doSplit() method to handle some of this, but it keeps the rearranged order. The best thing I've found is to remove the space between -n and Howdy, which will work with CliBuilder.

The following is what I have working:

target(main: 'Hello World') {
    def cli = new CliBuilder()
    cli.with
            {
                h(longOpt: 'help', 'Help - Usage Information')
                n(longOpt: 'name', 'Name to say hello to', args: 1, required: true)
            }
    def ops = doSplit(args)
    def opt = cli.parse(ops)
    if (!opt) return
    if (opt.h) cli.usage()
    println "Hello ${opt.n}"
}

private doSplit(String string){
    string.split(/(\n|[ ]|=)/).collect{ it.trim() }.findResults  { it && it != '' ? it : null }
}

Run this with: helloworld -nHowdy

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