lisp/json-string.lisp @ 4f28fbfd7d63 default tip

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

(defpackage :json-string
  (:use :cl)
  (:export :toplevel :*ui*))

(in-package :json-string)

;;;; Configuration ------------------------------------------------------------
(defparameter *version* "0.0.1")


;;;; Functionality ------------------------------------------------------------
(defun stringify (stream)
  (yason:encode
    (alexandria:read-stream-content-into-string stream)
    *standard-output*))


;;;; Run ----------------------------------------------------------------------
(defun run (paths)
  (if (null paths)
    (setf paths '("-")))
  (dolist (path paths)
    (fresh-line)
    (if (string= "-" path)
      (stringify *standard-input*)
      (with-open-file (stream path :direction :input)
        (stringify stream)))))


;;;; User Interface -----------------------------------------------------------
(defparameter *examples*
  '(("Stringify standard input:" . "echo 'foo and bar' | json-string")
    ("Turn 3 files into 3 strings:" . "json-string foo bar baz")
    ("Turn 3 files into one big string:" . "cat foo bar baz | json-string")))


(defparameter *option-help*
  (adopt:make-option 'help
    :help "Display help and exit."
    :long "help"
    :short #\h
    :reduce (constantly t)))

(defparameter *option-version*
  (adopt:make-option 'version
    :help "Display version information and exit."
    :long "version"
    :reduce (constantly t)))


(adopt:define-string *help-text*
  "json-string takes a stream of data (either standard input or a file) and ~
   renders its content into a JSON string, suitable for copying and pasting ~
   into a JSON file.  If multiple files are specified, they will each be ~
   converted into a string and printed one per line.")

(defparameter *ui*
  (adopt:make-interface
    :name "json-string"
    :usage "[OPTIONS] [FILE...]"
    :summary "render content as a JSON string"
    :help *help-text*
    :examples *examples*
    :contents (list *option-help*
                    *option-version*)))


(defmacro quit-on-ctrl-c (&body body)
  `(handler-case
     (progn ,@body)
     #+sbcl (sb-sys:interactive-interrupt (c)
               (declare (ignore c))
               (adopt:exit))))


(defun parse-options-or-exit (ui)
  (handler-case (adopt:parse-options ui)
    (error (c) (adopt:print-error-and-exit c))))


(defun toplevel (&aux arguments options)
  #+sbcl (sb-ext:disable-debugger)
  (quit-on-ctrl-c
    (setf (values arguments options)
          (parse-options-or-exit *ui*))
    (handler-case
        (progn
          (when (gethash 'help options)
            (adopt:print-help-and-exit *ui*))
          (when (gethash 'version options)
            (write-line *version*)
            (adopt:exit))
          (run arguments))
      (error (c) (adopt:print-error-and-exit c)))))