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;;; Haunt --- Static site generator for GNU Guile
;;; Copyright © 2022 David Thompson <davet@gnu.org>
;;;
;;; This file is part of Haunt.
;;;
;;; Haunt is free software; you can redistribute it and/or modify it
;;; under the terms of the GNU General Public License as published by
;;; the Free Software Foundation; either version 3 of the License, or
;;; (at your option) any later version.
;;;
;;; Haunt is distributed in the hope that it will be useful, but
;;; WITHOUT ANY WARRANTY; without even the implied warranty of
;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
;;; General Public License for more details.
;;;
;;; You should have received a copy of the GNU General Public License
;;; along with Haunt. If not, see <http://www.gnu.org/licenses/>.
;;; Commentary:
;;
;; Fallback file update watcher that uses a naive tree walking
;; implementation.
;;
;;; Code:
(define-module (haunt watch fallback)
#:use-module (haunt site)
#:use-module (ice-9 ftw)
#:export (watch))
(define (watch thunk check-dir? check-file?)
(define cwd (getcwd))
(define (any-files-changed? time)
(define (enter? name stat result)
;; Don't bother descending if we already know that a file has
;; changed.
(and (not result) (check-dir? name)))
(define (leaf name stat result)
;; Test if file has been modified since the last time we
;; checked.
(or result
(and (check-file? name)
(or (>= (stat:mtime stat) time)
(>= (stat:ctime stat) time)))))
(define (no-op name stat result) result)
(file-system-fold enter? leaf no-op no-op no-op no-op #f cwd))
(let loop ((time (current-time)))
(when (any-files-changed? time)
(display "watch: file changes detected")
(thunk))
(let ((next-time (current-time)))
(sleep 1)
(loop next-time))))
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