@pescobar: how is this different from --modules-footer? Is this basically the equivalent of that to define in easyconfigs? Why not call it modules_footer too?

as @boegel suggested I renamed the option to modextratclfooter, so now the easyconfig would be like this

modextratclfooter = """
if [ module-info mode load ] {
    puts stderr     "To execute GATK run: java -jar \$EBROOTGATK/GenomeAnalysisTK.jar"
}
"""

@pescobar: this parameter certainly has its uses (e.g. via --try-amend), but when people start including Tcl text in their easyconfigs they will run into trouble later when switching to Lmod & Lua module files (they will at some point ;-)).

So, how about adding a generic modextraloadmgs parameter too, which takes a list of strings (messages to print on loading of the module)?
That way, this can be supported in both Tcl & Lua module files by EasyBuild, without having to rewrite easyconfig files when you make the switch...

@boegel do you prefer a different PR for the modextraloadmsg or I add it to this PR?

@pescobar: feel free to add it in here, it won't make the PR that much bigger (and make it plural, msgs)

@pescobar: ping on the modextraloadmsg? If you're not planning to work on that soon, it can be done via a separate PR.

merged in (via #974), thanks @pescobar!