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+;; Support for parsing Makefiles
+;;
+;; Copyright (C) 2016 g10 Code GmbH
+;;
+;; This file is part of GnuPG.
+;;
+;; GnuPG 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.
+;;
+;; GnuPG 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 (parse-makefile port key)
+ (define (is-continuation? tokens)
+ (string=? (last tokens) "\\"))
+ (define (valid-token? s)
+ (< 0 (string-length s)))
+ (define (drop-continuations tokens)
+ (let loop ((acc '()) (tks tokens))
+ (if (null? tks)
+ (reverse acc)
+ (loop (if (string=? "\\" (car tks))
+ acc
+ (cons (car tks) acc)) (cdr tks)))))
+ (let next ((acc '()) (found #f))
+ (let ((line (read-line port)))
+ (if (eof-object? line)
+ acc
+ (let ((tokens (filter valid-token?
+ (string-splitp (string-trim char-whitespace?
+ line)
+ char-whitespace? -1))))
+ (cond
+ ((or (null? tokens)
+ (string-prefix? (car tokens) "#")
+ (and (not found) (not (and (string=? key (car tokens))
+ (string=? "=" (cadr tokens))))))
+ (next acc found))
+ ((not found)
+ (assert (and (string=? key (car tokens))
+ (string=? "=" (cadr tokens))))
+ (if (is-continuation? tokens)
+ (next (drop-continuations (cddr tokens)) #t)
+ (drop-continuations (cddr tokens))))
+ (else
+ (assert found)
+ (if (is-continuation? tokens)
+ (next (append acc (drop-continuations tokens)) found)
+ (append acc (drop-continuations tokens))))))))))
+
+(define (parse-makefile-expand filename expand key)
+ (define (variable? v)
+ (and (string-prefix? v "$(") (string-suffix? v ")")))
+
+ (let expand-all ((values (parse-makefile (open-input-file filename) key)))
+ (if (any variable? values)
+ (expand-all
+ (let expand-one ((acc '()) (v values))
+ (cond
+ ((null? v)
+ acc)
+ ((variable? (car v))
+ (let ((makefile (open-input-file filename))
+ (key (substring (car v) 2 (- (string-length (car v)) 1))))
+ (expand-one (append acc (expand filename makefile key))
+ (cdr v))))
+ (else
+ (expand-one (append acc (list (car v))) (cdr v))))))
+ values)))