How to invoke non default target in grails gant script - grails

Question

I have a gant script A with two targets
t1 - default target
t2 - another target
Even when I run
grails A t2
the default target is run? How can I run the non-default target?
I have tried grails A --target='t2' etc. but doesn't work.

Answer 1

I'm not sure if there's a proper way to do it, but you can write a second script ("T2.groovy") that loads this one and sets that target as its default, e.g.
includeTargets << new File("path/to/YourScript")
setDefaultTarget("t2")

Answer 2

A tweak to argsParsing approach is to run through elements from the argsMap and iteratively depend on them. So you could call your script something like:
grails myScript do-this do-that do-the-other
scriptName = 'myScriptName'
includeTargets << grailsScript("_GrailsArgParsing")
snip
target(main: "Default Target") {
depends(parseArguments)
if(argsMap?.size() == 0) {
depends(scriptError)
}
argsMap.each() {
if (it.value) {
println "${scriptName} building: ${it.value}"
depends(it.value)
}
else {
depends(scriptError)
}
}
}
snip
target(help: "Print a help message") {
println "${scriptName}: possible targets are..."
println "\thelp - print this help message"
}
target(scriptError: "Print an error and die") {
println "${scriptName}: Please specify at least one target name"
depends(help)
exit 1
}

Answer 3

This is another approach that I took
includeTargets << grailsScript("_GrailsArgParsing")
snip
target(main: "a script") {
if(!argsMap.target)
throw new IllegalArgumentException("please specify target name with --target option")
depends(argsMap.target)
}
setDefaultTarget(main)
You run the script with a parameter. That parameter is the name of the method to run :) That method then get's executed.