It would be nice to be able to select multiple files
from the Document Selector and have those file
names passed to my custom tool on the command
line.
In particular, I want to integrate a third-party compare
utility with TextPad. I am imagining that I would
configure those files similar to this in the Parameters
text box of the Preferences dialog (Tools section):
$File1 $File2
where $File1 would be the first file selected and $File2
would be the second, etc.
I have a program that might help: It launches a window that allows you to select files, and then runs a program using the selected files. (So it's like an external document selector).
If you could post the command line of your tool, I can configure and post the program.