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110 lines
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<span class="hidden">CLiki - cy</span>
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<div id="content"><div id="content-area"><div id="article-title">cy</div><div id="article">Cy is a <a href="Person.html" class="category">Person</a> though perhaps to a questionable degree, who likes programming to be simple and easy. Cy is not a very happy <a href="Person.html" class="category">Person</a> as a consequence.<p>Cy is for cymbolic cyxpressions<p>Cy likes when fundamental parts of the language nobody talks about are made clear, for instance:
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<ul>
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<li>Here is how function cells work:
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</li>
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</ul><div class="code"><span class="nonparen"><span class="comment">;; make a dummy function that prints something
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</span><span class="paren1">(<span class="nonparen"><a href="https://www.cliki.net/site/HyperSpec/Body/mac_defmacro.html" class="symbol"><i><span class="symbol">defmacro</span></i></a> p <span class="paren2">(<span class="nonparen">s</span>)</span>
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<span class="paren2">(<span class="nonparen"><a href="https://www.cliki.net/site/HyperSpec/Body/any_lambda.html" class="symbol"><i><span class="symbol">lambda</span></i></a> <span class="paren3">(<span class="nonparen"></span>)</span>
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<span class="paren3">(<span class="nonparen"><a href="https://www.cliki.net/site/HyperSpec/Body/fun_writecm_p_rintcm_princ.html" class="symbol">print</a> s</span>)</span>
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<span class="paren3">(<span class="nonparen"><a href="https://www.cliki.net/site/HyperSpec/Body/fun_terpricm_fresh-line.html" class="symbol">terpri</a></span>)</span></span>)</span></span>)</span>
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<span class="paren1">(<span class="nonparen"><a href="https://www.cliki.net/site/HyperSpec/Body/fun_funcall.html" class="symbol">funcall</a> <span class="paren2">(<span class="nonparen">p <span class="string">"here goes"</span></span>)</span></span>)</span>
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<span class="paren1">(<span class="nonparen"><a href="https://www.cliki.net/site/HyperSpec/Body/any_setf.html" class="symbol">setf</a> <span class="paren2">(<span class="nonparen"><a href="https://www.cliki.net/site/HyperSpec/Body/acc_symbol-function.html" class="symbol">symbol-function</a> 'foo</span>)</span> <span class="paren2">(<span class="nonparen">p <span class="string">"in the function cell"</span></span>)</span></span>)</span>
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<span class="paren1">(<span class="nonparen">foo</span>)</span>
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<span class="paren1">(<span class="nonparen"><a href="https://www.cliki.net/site/HyperSpec/Body/any_setf.html" class="symbol">setf</a> <span class="paren2">(<span class="nonparen"><a href="https://www.cliki.net/site/HyperSpec/Body/acc_symbol-function.html" class="symbol">symbol-function</a> 'foo</span>)</span> <span class="paren2">(<span class="nonparen">p <span class="string">"re-assigned the function cell"</span></span>)</span></span>)</span>
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<span class="paren1">(<span class="nonparen">foo</span>)</span>
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<span class="paren1">(<span class="nonparen"><a href="https://www.cliki.net/site/HyperSpec/Body/any_setf.html" class="symbol">setf</a> <span class="paren2">(<span class="nonparen"><a href="https://www.cliki.net/site/HyperSpec/Body/acc_symbol-function.html" class="symbol">symbol-function</a> 'foo</span>)</span> <span class="paren2">(<span class="nonparen">p <span class="string">"the global function cell for foo"</span></span>)</span></span>)</span>
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<span class="paren1">(<span class="nonparen"><a href="https://www.cliki.net/site/HyperSpec/Body/speope_fletcm_scm_macrolet.html" class="symbol"><i><span class="symbol">flet</span></i></a> <span class="paren2">(<span class="nonparen"><span class="paren3">(<span class="nonparen">foo <span class="paren4">(<span class="nonparen"></span>)</span> <span class="paren4">(<span class="nonparen">p <span class="string">"local function cell"</span></span>)</span></span>)</span></span>)</span>
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<span class="paren2">(<span class="nonparen">foo</span>)</span>
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<span class="paren2">(<span class="nonparen"><a href="https://www.cliki.net/site/HyperSpec/Body/any_setf.html" class="symbol">setf</a> <span class="paren3">(<span class="nonparen"><a href="https://www.cliki.net/site/HyperSpec/Body/acc_symbol-function.html" class="symbol">symbol-function</a> 'foo</span>)</span> <span class="paren3">(<span class="nonparen">p <span class="string">"oops! assigned the global function cell"</span></span>)</span></span>)</span>
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<span class="paren2">(<span class="nonparen">foo</span>)</span></span>)</span>
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<span class="paren1">(<span class="nonparen"><a href="https://www.cliki.net/site/HyperSpec/Body/fun_writecm_p_rintcm_princ.html" class="symbol">print</a> <span class="string">"back in the global context"</span></span>)</span>
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<span class="paren1">(<span class="nonparen"><a href="https://www.cliki.net/site/HyperSpec/Body/fun_terpricm_fresh-line.html" class="symbol">terpri</a></span>)</span>
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<span class="paren1">(<span class="nonparen">foo</span>)</span>
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<span class="comment">;; still no idea how to catch COMPILE time warnings
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</span><span class="comment">;; such as sbcl which detects setting a function cell to a number type
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</span><span class="paren1">(<span class="nonparen"><a href="https://www.cliki.net/site/HyperSpec/Body/speope_catch.html" class="symbol"><i><span class="symbol">catch</span></i></a> 'noprob
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<span class="paren2">(<span class="nonparen"><a href="https://www.cliki.net/site/HyperSpec/Body/mac_handler-bind.html" class="symbol">handler-bind</a>
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<span class="paren3">(<span class="nonparen"><span class="paren4">(<span class="nonparen"><a href="https://www.cliki.net/site/HyperSpec/Body/contyp_simple-type-error.html" class="symbol">simple-type-error</a> #'<span class="paren5">(<span class="nonparen"><a href="https://www.cliki.net/site/HyperSpec/Body/any_lambda.html" class="symbol"><i><span class="symbol">lambda</span></i></a> <span class="paren6">(<span class="nonparen">c</span>)</span>
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<span class="paren6">(<span class="nonparen"><a href="https://www.cliki.net/site/HyperSpec/Body/sym_declare.html" class="symbol">declare</a> <span class="paren1">(<span class="nonparen"><a href="https://www.cliki.net/site/HyperSpec/Body/dec_ignorecm_ignorable.html" class="symbol">ignore</a> c</span>)</span></span>)</span>
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<span class="paren6">(<span class="nonparen"><a href="https://www.cliki.net/site/HyperSpec/Body/fun_writecm_p_rintcm_princ.html" class="symbol">print</a> 'yay</span>)</span>
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<span class="paren6">(<span class="nonparen"><a href="https://www.cliki.net/site/HyperSpec/Body/speope_throw.html" class="symbol"><i><span class="symbol">throw</span></i></a> 'noprob <a href="https://www.cliki.net/site/HyperSpec/Body/any_nil.html" class="symbol">nil</a></span>)</span></span>)</span></span>)</span></span>)</span>
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<span class="paren3">(<span class="nonparen"><a href="https://www.cliki.net/site/HyperSpec/Body/any_setf.html" class="symbol">setf</a> <span class="paren4">(<span class="nonparen"><a href="https://www.cliki.net/site/HyperSpec/Body/acc_symbol-function.html" class="symbol">symbol-function</a> 'foo</span>)</span> 23</span>)</span></span>)</span></span>)</span>
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<span class="paren1">(<span class="nonparen"><a href="https://www.cliki.net/site/HyperSpec/Body/fun_terpricm_fresh-line.html" class="symbol">terpri</a></span>)</span>
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</span></div>
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<li>
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asdf stores compiled .fasl files in ~/.cache/common-lisp/ by default
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</li><li>
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You can make a .fasl from a .lisp file, by (compile-file "name.lisp")
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</li><li>
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This is the difference between let and symbol-macrolet:
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</li><div class="code"><span class="nonparen"><span class="paren1">(<span class="nonparen"><a href="https://www.cliki.net/site/HyperSpec/Body/mac_defun.html" class="symbol"><i><span class="symbol">defun</span></i></a> make-side-effect <span class="paren2">(<span class="nonparen"></span>)</span>
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<span class="paren2">(<span class="nonparen"><a href="https://www.cliki.net/site/HyperSpec/Body/speope_letcm_letst.html" class="symbol"><i><span class="symbol">let</span></i></a> <span class="paren3">(<span class="nonparen"><span class="paren4">(<span class="nonparen">i 0</span>)</span></span>)</span>
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<span class="paren3">(<span class="nonparen"><a href="https://www.cliki.net/site/HyperSpec/Body/any_lambda.html" class="symbol"><i><span class="symbol">lambda</span></i></a> <span class="paren4">(<span class="nonparen"></span>)</span>
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<span class="paren4">(<span class="nonparen"><a href="https://www.cliki.net/site/HyperSpec/Body/spefor_setq.html" class="symbol"><i><span class="symbol">setq</span></i></a> i <span class="paren5">(<span class="nonparen"><a href="https://www.cliki.net/site/HyperSpec/Body/any_pl.html" class="symbol">+</a> i 1</span>)</span></span>)</span></span>)</span></span>)</span></span>)</span>
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<span class="paren1">(<span class="nonparen"><a href="https://www.cliki.net/site/HyperSpec/Body/any_setf.html" class="symbol">setf</a> <span class="paren2">(<span class="nonparen"><a href="https://www.cliki.net/site/HyperSpec/Body/acc_symbol-function.html" class="symbol">symbol-function</a> 'i</span>)</span> <span class="paren2">(<span class="nonparen">make-side-effect</span>)</span></span>)</span>
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<span class="paren1">(<span class="nonparen"><a href="https://www.cliki.net/site/HyperSpec/Body/fun_writecm_p_rintcm_princ.html" class="symbol">print</a> <span class="paren2">(<span class="nonparen"><a href="https://www.cliki.net/site/HyperSpec/Body/any_list.html" class="symbol">list</a> <span class="paren3">(<span class="nonparen">i</span>)</span> <span class="paren3">(<span class="nonparen">i</span>)</span> <span class="paren3">(<span class="nonparen">i</span>)</span></span>)</span></span>)</span>
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<span class="paren1">(<span class="nonparen"><a href="https://www.cliki.net/site/HyperSpec/Body/speope_letcm_letst.html" class="symbol"><i><span class="symbol">let</span></i></a> <span class="paren2">(<span class="nonparen"><span class="paren3">(<span class="nonparen">ii <span class="paren4">(<span class="nonparen">i</span>)</span></span>)</span></span>)</span>
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<span class="paren2">(<span class="nonparen"><a href="https://www.cliki.net/site/HyperSpec/Body/fun_writecm_p_rintcm_princ.html" class="symbol">print</a> <span class="paren3">(<span class="nonparen"><a href="https://www.cliki.net/site/HyperSpec/Body/any_list.html" class="symbol">list</a> ii ii ii</span>)</span></span>)</span></span>)</span>
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<span class="paren1">(<span class="nonparen"><a href="https://www.cliki.net/site/HyperSpec/Body/speope_symbol-macrolet.html" class="symbol"><i><span class="symbol">symbol-macrolet</span></i></a> <span class="paren2">(<span class="nonparen"><span class="paren3">(<span class="nonparen">ii <span class="paren4">(<span class="nonparen">i</span>)</span></span>)</span></span>)</span>
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<span class="paren2">(<span class="nonparen"><a href="https://www.cliki.net/site/HyperSpec/Body/fun_writecm_p_rintcm_princ.html" class="symbol">print</a> <span class="paren3">(<span class="nonparen"><a href="https://www.cliki.net/site/HyperSpec/Body/any_list.html" class="symbol">list</a> ii ii ii</span>)</span></span>)</span></span>)</span>
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<span class="paren1">(<span class="nonparen"><a href="https://www.cliki.net/site/HyperSpec/Body/fun_writecm_p_rintcm_princ.html" class="symbol">print</a> '<span class="paren2">(<span class="nonparen">Q E D</span>)</span></span>)</span>
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