Add mes and mescc-tools-extra

mescc-tools-extra contains two important tools:
- cp
- chmod

mes first builds itself from a mes 0.21 seed as used by guix, and then
builds a mes 0.22 and then mes 0.22 using that created mes 0.22.

It does /not/ use bootstrap.sh as we don't have a proper shell at this
point, it has been manually adapted for kaem.

sysa/mes-0.22/mes/module/srfi/srfi-14.mes

@@ -0,0 +1,90 @@
+;;; -*-scheme-*-
+
+;;; GNU Mes --- Maxwell Equations of Software
+;;; Copyright © 2016,2018 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
+;;;
+;;; This file is part of GNU Mes.
+;;;
+;;; GNU Mes 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 Mes 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 GNU Mes.  If not, see <http://www.gnu.org/licenses/>.
+
+;;; Commentary:
+
+;;; Minimal implementation of srfi-14, for nyacc.
+
+;;; Code:
+
+;; FIXME: have structs
+(define (char-set . x)
+  (cons '*char-set* x))
+
+(define (char-set? x)
+  (and (pair? x) (eq? (car x) '*char-set*)))
+
+(define (char-set= a b)
+  (and (char-set? a) (char-set? b)
+       (equal? a b)))
+
+(define char-set:whitespace (char-set #\tab #\page #\return #\vtab #\newline #\space))
+(define char-set:digit (apply char-set
+                                   (map integer->char
+                                        (map (lambda (i)
+                                               (+ i (char->integer #\0))) (iota 10)))))
+
+(define char-set:lower-case (apply char-set
+                                   (map integer->char
+                                        (map (lambda (i)
+                                               (+ i (char->integer #\a))) (iota 26)))))
+
+(define char-set:upper-case (apply char-set
+                                   (map integer->char
+                                        (map (lambda (i)
+                                               (+ i (char->integer #\A))) (iota 26)))))
+
+(define (list->char-set lst)
+  (apply char-set lst))
+
+(define (string->char-set x . base)
+  (apply char-set (append (string->list x) (if (null? base) '() (cdar base)))))
+
+(define (string->char-set! x base)
+  (set-cdr! (last-pair base) (string->list x))
+  base)
+
+(define (char-set-adjoin cs . chars)
+  (append cs chars))
+
+(define (char-set-contains? cs x)
+  (and (memq x cs) #t))
+
+(define (char-set-complement cs)
+  (let ((ascii (map integer->char (iota 128))))
+    (list->char-set (filter (lambda (c) (not (char-set-contains? cs c))) ascii))))
+
+(define (char-whitespace? c)
+  (char-set-contains? char-set:whitespace c))
+
+(define (char-set-copy cs)
+  (map identity cs))
+
+(define (char-upcase c)
+  (if (char-set-contains? char-set:lower-case c) (integer->char (- (char->integer c)
+                                                                   (- (char->integer #\a)
+                                                                      (char->integer #\A))))
+      c))
+
+(define (char-downcase c)
+  (if (char-set-contains? char-set:upper-case c) (integer->char (+ (char->integer c)
+                                                                   (- (char->integer #\a)
+                                                                      (char->integer #\A))))
+      c))