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(in-package #:tempest)
(defun read-tempest-string (filename)
"Read file content as string. If it's not a .lisp file and does not have tempest comment at top, return NIL."
(let ((content (uiop:read-file-string filename)))
(if (str:starts-with-p ";;;; TEMPEST" content)
content NIL)))
(defun compile-to-html (tempest-string)
"Compiles spinneret string to HTML string. Redirects to standard output."
(let ((*read-eval* nil))
(-> (concatenate 'string "(spinneret:with-html " tempest-string ")")
read-from-string
eval)))
(defun build-template (filename)
(let ((raw (read-tempest-string filename)))
(if raw
(let ((target-file (str:replace-all ".lisp" ".html" filename)))
(with-open-file (*standard-output* target-file
:direction :output
:if-exists :supersede
:if-does-not-exist :create)
(compile-to-html raw)
target-file))
NIL)))
(defun build (dir)
(cl-fad:walk-directory dir
(lambda (path-name)
(let ((name (namestring path-name)))
(when (str:ends-with-p ".lisp" name :ignore-case T)
(build-template name))))))
;; TODO handle frequent/simultaneous events, only build once
;; TODO handle :MOVE event, delete old one and create new one
;; TODO handle :DELETE event, delete template as well
(defun watch (dir)
(file-notify:watch dir)
(file-notify:with-events (file change :timeout T)
(when (and (str:ends-with-p ".lisp" file :ignore-case T)
(or (eql change :MODIFY)
(eql change :CREATE)))
(let ((built-file (build-template file)))
(if built-file
(format t "Built ~a, because of ~a~%" built-file change)
nil)))))
(defun run (subcommand &rest args)
(cond ((equal subcommand "build")
(mapcar 'build args))
;; TODO support watching multiple dirs
((equal subcommand "watch")
(watch (car args)))))
(defun main ()
(let ((cli-args (cdr sb-ext:*posix-argv*)))
(run (car cli-args) (cdr cli-args))))
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