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;;; Haunt --- Static site generator for GNU Guile
;;; Copyright © 2015 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:
;;
;; Static asset data type.
;;
;;; Code:
(define-module (haunt asset)
#:use-module (srfi srfi-1)
#:use-module (srfi srfi-9)
#:use-module (ice-9 ftw)
#:use-module (ice-9 match)
#:use-module (haunt utils)
#:export (make-asset
asset?
asset-source
asset-target
install-asset
directory-assets))
;; Assets are static files that are copied verbatim from a site's
;; source directory to the target output directory, such as images,
;; CSS, and JavaScript files. The 'source' and 'target' fields are
;; file names that are relative to a source and target directory,
;; respectively.
(define-record-type <asset>
(make-asset source target)
asset?
(source asset-source)
(target asset-target))
(define (install-asset asset prefix)
"Install ASSET source file into destination directory within
PREFIX."
(match asset
(($ <asset> source target)
(let ((target* (string-append prefix "/" target)))
(mkdir-p (dirname target*))
(copy-file source target*)))))
(define (directory-assets directory keep? dest)
"Create a list of asset objects to be stored within DEST for all
files in DIRECTORY that match KEEP?, recursively."
(define enter? (const #t))
;; In order to do accurate file name manipulation, every file name
;; is converted into a list of components, manipulated, then
;; converted back into a string.
(define leaf
(let ((base-length (length (file-name-components directory)))
(dest* (file-name-components dest)))
(lambda (file-name stat memo)
(if (keep? file-name)
(let* ((file-name* (file-name-components file-name))
(target (join-file-name-components
(append dest* (drop file-name* base-length)))))
(cons (make-asset file-name target) memo))
memo))))
(define (noop file-name stat memo) memo)
(define (err file-name stat errno memo)
(error "asset processing failed with errno: " file-name errno))
(file-system-fold enter? leaf noop noop noop err '() directory))
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