plugin.txt VARIABLE array options as combobox

[jmthomas]

Currently the VARIABLE keyword takes two parameters, the name and the default value. I'd like it to take additional values which result in the VARIABLE being rendered as a combobox with only those options available.

VARIABLE target_name INST INST2 INST3 would render a combobox with three choices: INST, INST2, INST3

If the user wanted to add an option that currently doesn't exist they can directly edit the plugin.txt so I don't think we need a custom input. Plus the plugin author is making an explicit choice that these are the only available options.

Note we also want to support a future VARIABLE description option as specified in #764. This would look something like:

VARIABLE target_name INST INST2 INST3 "Select the target name"

So we'll have to check for quotes on the last parameter when that is implemented.

[ryanmelt]

Most things like this I would like to handle with additional keywords.
There is a lot of detail we can add to the plugin install process. For example the combobox options could be VARIABLE_STATE for example. Trying to lean away from the really long unnamed parameter lists that we have used in the past.

[jmthomas]

So then if additional OPTIONs / DEFAULTs are given we render combobox:

VARIABLE target_name INST "Select the target name"
  OPTION INST2
  DEFAULT INST3

I'm sort of leaning toward OPTION. That would still allow for the description to be given on the same line ... that makes parsing easier and easier to edit.

[ryanmelt]

I think everything associated with VARIABLE should start with VARIABLE_ Also the first given can be the assumed default.