Grails script and passing parameters using Groovy CLIBuilder? - grails

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?

Answer 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.

Answer 2

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