lisp/subex.lisp @ 031a18772407

(eval-when (:compile-toplevel :load-toplevel :execute)
  (ql:quickload '(:adopt) :silent t))

(defpackage :subex
  (:use :cl)
  (:export :toplevel *ui*))

(in-package :subex)

;;;; Global Options and UI ----------------------------------------------------
(defparameter *o/help*
  (adopt:make-option 'help :long "help" :help "display help and exit" :reduce (constantly t)))

(defparameter *o/version*
  (adopt:make-option 'version :long "version" :help "display version and exit" :reduce (constantly t)))

(defparameter *ui/main*
  (adopt:make-interface
    :name "subex"
    :usage "[subcommand] [options]"
    :help "subcommand example program"
    :summary "an example program that uses subcommands"
    :contents (list *o/help* *o/version*)))

(defparameter *ui* *ui/main*)


;;;; Subcommand Foo -----------------------------------------------------------
(defparameter *o/foo/a*
  (adopt:make-option 'a :result-key 'mode :short #\a :help "run foo in mode A" :reduce (constantly :a)))

(defparameter *o/foo/b*
  (adopt:make-option 'b :result-key 'mode :short #\b :help "run foo in mode B" :reduce (constantly :b)))

(defparameter *ui/foo*
  (adopt:make-interface
    :name "subex foo"
    :usage "foo [-a|-b]"
    :summary "foo some things"
    :help "foo some things"
    :contents (list *o/foo/a* *o/foo/b*)))

(defun run/foo (mode)
  (format t "Running foo in ~A mode.~%" mode))


;;;; Subcommand Bar -----------------------------------------------------------
(defparameter *o/bar/meow*
  (adopt:make-option 'meow :long "meow" :help "meow loudly after each step" :reduce (constantly t)))

(defparameter *ui/bar*
  (adopt:make-interface
    :name "subex bar"
    :usage "bar [--meow] FILE..."
    :summary "bar some files"
    :help "bar some files"
    :contents (list *o/bar/meow*)))

(defun run/bar (paths meow?)
  (dolist (p paths)
    (format t "Bar-ing ~A.~%" p)
    (when meow?
      (write-line "meow."))))


;;;; Toplevel -----------------------------------------------------------------
(defun toplevel/foo (args)
  (multiple-value-bind (arguments options) (adopt:parse-options-or-exit *ui/foo* args)
    (unless (null arguments)
      (error "Foo does not take arguments, got ~S" arguments))
    (run/foo (gethash 'mode options))))

(defun toplevel/bar (args)
  (multiple-value-bind (arguments options) (adopt:parse-options-or-exit *ui/bar* args)
    (when (null arguments)
      (error "Bar requires arguments, got none."))
    (run/bar arguments (gethash 'meow options))))

(defun lookup-subcommand (string)
  (cond
    ((null string) (values nil *ui/main*))
    ((string= string "foo") (values #'toplevel/foo *ui/foo*))
    ((string= string "bar") (values #'toplevel/bar *ui/bar*))
    (t (error "Unknown subcommand ~S" string))))

(defun toplevel ()
  (sb-ext:disable-debugger)
  (multiple-value-bind (arguments global-options)
      (handler-bind ((adopt:unrecognized-option 'adopt:treat-as-argument))
        (adopt:parse-options *ui/main*))
    (when (gethash 'version global-options)
      (write-line "1.0.0")
      (adopt:exit))
    (multiple-value-bind (subtoplevel ui) (lookup-subcommand (first arguments))
      (when (or (null subtoplevel)
                (gethash 'help global-options))
        (adopt:print-help-and-exit ui))
      (funcall subtoplevel (rest arguments)))))