141 lines
6.5 KiB
HTML
141 lines
6.5 KiB
HTML
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ASDF Copyright (C) 2001-2019 Daniel Barlow and contributors.
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This manual Copyright (C) 2001-2019 Daniel Barlow and contributors.
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This manual revised (C) 2009-2019 Robert P. Goldman and Francois-Rene Rideau.
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<title>Rejected ideas (ASDF Manual)</title>
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<div class="section" id="Rejected-ideas">
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<div class="header">
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<p>
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Next: <a href="TODO.html" accesskey="n" rel="next">TODO</a>, Previous: <a href="Status.html" accesskey="p" rel="prev">Status</a>, Up: <a href="Controlling-where-ASDF-searches-for-systems.html" accesskey="u" rel="up">Controlling where ASDF searches for systems</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html" title="Index" rel="index">Index</a>]</p>
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</div>
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<hr>
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<span id="Rejected-ideas-1"></span><h3 class="section">8.13 Rejected ideas</h3>
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<p>Alternatives I (FRR) considered and rejected while developing ASDF 2 included:
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</p>
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<ol>
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<li> Keep <code>asdf:*central-registry*</code> as the master with its current semantics,
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and somehow the configuration parser expands the new configuration
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language into a expanded series of directories of subdirectories to
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lookup, pre-recursing through specified hierarchies. This is kludgy,
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and leaves little space of future cleanups and extensions.
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</li><li> Keep <code>asdf:*central-registry*</code> as the master but extend its semantics
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in completely new ways, so that new kinds of entries may be implemented
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as a recursive search, etc. This seems somewhat backwards.
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</li><li> Completely remove <code>asdf:*central-registry*</code>
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and break backwards compatibility.
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Hopefully this will happen in a few years after everyone migrate to
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a better ASDF and/or to XCVB, but it would be very bad to do it now.
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</li><li> Replace <code>asdf:*central-registry*</code> by a symbol-macro with appropriate magic
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when you dereference it or setf it. Only the new variable with new
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semantics is handled by the new search procedure.
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Complex and still introduces subtle semantic issues.
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</li></ol>
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<p>I’ve been suggested the below features, but have rejected them,
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for the sake of keeping ASDF no more complex than strictly necessary.
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</p>
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<ul>
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<li> More syntactic sugar: synonyms for the configuration directives, such as
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<code>(:add-directory X)</code> for <code>(:directory X)</code>, or <code>(:add-directory-hierarchy X)</code>
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or <code>(:add-directory X :recurse t)</code> for <code>(:tree X)</code>.
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</li><li> The possibility to register individual files instead of directories.
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</li><li> Integrate Xach Beane’s tilde expander into the parser,
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or something similar that is shell-friendly or shell-compatible.
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I’d rather keep ASDF minimal. But maybe this precisely keeps it
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minimal by removing the need for evaluated entries that ASDF has?
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i.e. uses of <code>USER-HOMEDIR-PATHNAME</code> and <code>$SBCL_HOME</code>
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Hopefully, these are already superseded by the <code>:default-registry</code>
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</li><li> Using the shell-unfriendly syntax <code>/**</code> instead of TEXINPUTS-like <code>//</code> to specify recursion
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down a filesystem tree in the environment variable.
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It isn’t that Lisp friendly either.
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</li></ul>
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</div>
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<hr>
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<div class="header">
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<p>
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Next: <a href="TODO.html">TODO</a>, Previous: <a href="Status.html">Status</a>, Up: <a href="Controlling-where-ASDF-searches-for-systems.html">Controlling where ASDF searches for systems</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html" title="Index" rel="index">Index</a>]</p>
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