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+;;; ccwl --- Concise Common Workflow Language
+;;; Copyright © 2021 Arun Isaac <arunisaac@systemreboot.net>
+;;;
+;;; This file is part of ccwl.
+;;;
+;;; ccwl 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.
+;;;
+;;; ccwl 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 ccwl. If not, see <https://www.gnu.org/licenses/>.
+
+;;; Commentary:
+
+;; This script scans source files and prints dependencies for make to
+;; pick up.
+
+;;; Code:
+
+(use-modules (srfi srfi-1)
+ (srfi srfi-171)
+ (ice-9 match)
+ (skribilo reader skribe))
+
+(define (skribilo-document file)
+ "Read skribilo FILE and return the document form."
+ (call-with-input-file file
+ (lambda (port)
+ (port-transduce (tfilter (match-lambda
+ (('document _ ...) #t)
+ (_ #f)))
+ (rany identity)
+ (make-skribe-reader)
+ port))))
+
+(define (find-dependencies document)
+ "Return a list of dependencies of the skribilo form DOCUMENT. Each
+dependency is of the form (tag . file). tag may either be the symbol
+'image or the symbol 'other."
+ (match document
+ (('image args ...)
+ (apply (lambda* (#:key file #:allow-other-keys)
+ `((image . ,file)))
+ args))
+ (('source args ...)
+ (apply (lambda* (#:key file #:allow-other-keys)
+ `((other . ,file)))
+ args))
+ (('scheme-source file)
+ `((other . ,file)))
+ (('source-ref file _ ...)
+ `((other . ,file)))
+ ((elements ...)
+ (append-map find-dependencies elements))
+ (atom '())))
+
+;; Print dependencies
+(let ((dependencies
+ (find-dependencies (skribilo-document "doc/ccwl.skb"))))
+ (format #t "DOC_IMAGES = ~a~%"
+ (string-join (filter-map (match-lambda
+ (('image . file) file)
+ (_ #f))
+ dependencies)
+ " "))
+ (format #t "DOC_OTHER_DEPENDENCIES = ~a~%"
+ (string-join (filter-map (match-lambda
+ (('other . file) file)
+ (_ #f))
+ dependencies)
+ " ")))