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+;; Contents of the (gnu make) Guile module
+;; Copyright (C) 2011-2016 Free Software Foundation, Inc.
+;; This file is part of GNU Make.
+;;
+;; GNU Make 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.
+;;
+;; GNU Make 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 this program. If not, see <http://www.gnu.org/licenses/>.
+
+(define (to-string-maybe x)
+ (cond
+ ;; In GNU make, "false" is the empty string
+ ((or (not x)
+ (unspecified? x)
+ (variable? x)
+ (null? x)
+ (and (string? x) (string-null? x)))
+ #f)
+ ;; We want something not false... not sure about this
+ ((eq? x #t) "#t")
+ ;; Basics
+ ((or (symbol? x) (number? x))
+ (object->string x))
+ ((char? x)
+ (string x))
+ ;; Printable string (no special characters)
+ ((and (string? x) (string-every char-set:printing x))
+ x)
+ ;; No idea: fail
+ (else (error "Unknown object:" x))))
+
+(define (obj-to-str x)
+ (let ((acc '()))
+ (define (walk x)
+ (cond ((pair? x) (walk (car x)) (walk (cdr x)))
+ ((to-string-maybe x) => (lambda (s) (set! acc (cons s acc))))))
+ (walk x)
+ (string-join (reverse! acc))))
+
+;; Return the value of the GNU make variable V
+(define (gmk-var v)
+ (gmk-expand (format #f "$(~a)" (obj-to-str v))))
+
+;; Export the public interfaces
+(export gmk-expand gmk-eval gmk-var)