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Article contents:== Outdated egg! This is an egg for CHICKEN 4, the unsupported old release. You're almost certainly looking for [[/eggref/5/s48-modules|the CHICKEN 5 version of this egg]], if it exists. If it does not exist, there may be equivalent functionality provided by another egg; have a look at the [[https://wiki.call-cc.org/chicken-projects/egg-index-5.html|egg index]]. Otherwise, please consider porting this egg to the current version of CHICKEN. [[tags: egg]] == s48-modules [[toc:]] === Description Chicken wrapper for the Scheme48 module system. === Author Felix === Requirements none === Documentation This egg allows you to compile Scheme48 modules as-is, and use them in your Chicken programs. Most of the module (or "package") syntax is supported. For information on how to use these, see [[http://s48.org/1.8/manual/manual-Z-H-5.html|the Scheme48 manual]]. === Limitations and caveats This module system only generates import statements. Libraries are not loaded by import statements. This means you will have to load the libraries exporting the modules yourself prior to using the s48 modules. The following code actually defines ''two'' modules; {{foo}} and {{_foo}}: <enscript highlight=scheme> (define-structure foo (export bar) (open scheme) (files foo)) </enscript> That's because {{define-structure}} internally expands to {{define-structures}} with only one structure defined. Generating several modules with differing export lists requires one common internal module holding the actual code, which exports all its symbols. If you have several modules defined, the name of the internal module is equal to the first in the list, prefixed by an underscore. If you ask Chicken to generate import libraries while compiling, don't forget to add an extra {{-j}} flag to generate the "hidden" import library, as well. ==== include-relative This module also defines the following macro as a replacement for the regular [[/manual/Non-standard macros and special forms#include|include]] macro: <macro>(include-relative filename)</macro> This includes {{filename}} just like {{include}} would, but if you use {{include-relative}} inside ''that'' file, it will include files relative to the directory in which {{filename}} is located (include would instead just try to find the file relative to the topmost file you're compiling). This macro must be used to include Scheme 48 module/package files which use {{files}} declarations to load external files. For example, this code: <enscript highlight=scheme> ;; file: /rootpath/foo.scm (include "bar/qux.scm") </enscript> <enscript highlight=scheme> ;; file: /rootpath/bar/qux.scm (include "mooh/blah.scm") </enscript> Would fail to load {{/rootpath/bar/mooh/blah.scm}}. Instead, it gives an error because it is trying to load {{/rootpath/mooh/blah.scm}}. Whereas this would work: <enscript highlight=scheme> ;; file: /rootpath/foo.scm (use s48-modules) (include-relative "bar/qux.scm") </enscript> <enscript highlight=scheme> ;; file: /rootpath/bar/qux.scm (include-relative "mooh/blah.scm") </enscript> === Changelog * 0.4.1 Do not implicitly cause "dummy" import modules with leading underscore to get emitted when compiling. Fixes #854. * 0.4 Fix strange module error with include-relative when compiling (#268, thanks to Felix) * 0.3 Add include-relative * 0.2 Tests and minor bugfixes * 0.1 Initial release === License Copyright (c) 2008, Felix L. Winkelmann All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. Neither the name of the author nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. Description of your changes:

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