So after completing (?) the Pleroma bot, I talked about in a previous post I wanted to create a simple executable that would be self-contained and run on any machine. If you have a Common Lisp implementation on a computer it's trivial to run any program that is bundled in a package, just load the package and then run the appropriate entry function from the repl.
What happens if you don't have a Lisp installed?
Well most modern Lisps have the ability to dump the current Lisp environment in way that can be "re-run". In this way we can create executables that have the whole implementation in them and so they are self-contained. On this builds Buildapp, so it configures and saves a Lisp image in an executable file.
Buildapp works with SBCL or CCL. An easy way to get it is via quicklisp. Fire an SBCL repl and run:
(ql:quickload 'buildapp) (buildapp:build-buildapp)
Then you get a binary file, so put it somewhere in your PATH.
Next step is to build our executable image/file.
buildapp --output pleroma-bot \ --asdf-tree ~/quicklisp/ \ --load-system pleroma-bot \ --eval "(defun main (arg) (declare (ignore arg)) (pleroma-bot:run-bot))" \ --entry main
So in order here we:
- set the output file (where our executable will be created)
- set the folder from where to load asdf systems
- select which system to load
- create a wrapping function to drop arguments cause buildapp always passes command-line arguments to our program
- set the "main" function of our executable
Quite easy, right? Happy Christmas everyone!