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<!--
# VIP @lib/vip/html.l
# 09dec25 Software Lab. Alexander Burger
-->
<!DOCTYPE html>
<html lang="en">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>W</title>
<link rel="stylesheet" href="doc.css" type="text/css">
</head>
<body>
<h1>W</h1>
<dl>
<dt><a id="*Winch"><code>*Winch</code></a></dt>
<dd>Global variable holding a (possibly empty) <code>prg</code> body, which will
be executed when a SIGWINCH signal is sent to the current process. See also
<code><a href="refA.html#alarm">alarm</a></code>, <code><a
href="refS.html#sigio">sigio</a></code>, <code><a
href="refH.html#*Hup">*Hup</a></code>, <code><a
href="refS.html#*Sig1">*Sig[12]</a></code>, <code><a
href="refT.html#*TStp1">*TStp[12]</a></code> and <code><a
href="refT.html#*Term">*Term</a></code>.
<pre>
: (de *Winch (msg 'SIGWINCH))
-> *Winch
</pre></dd>
<dt><a id="wait"><code>(wait 'cnt|NIL . prg) -> any</code></a></dt>
<dt><code>(wait 'cnt|NIL T 'fd) -> fd|NIL</code></dt>
<dd>Waits for a condition. While the result of the execution of <code>prg</code>
is <code>NIL</code> (first form), or no input is available for the file
descriptor in <code>fd</code> (second form), a <code>poll(2)</code> system call
is executed for all file descriptors and timers in the <code>VAL</code> of the
global variable <code><a href="refR.html#*Run">*Run</a></code>. When
<code>cnt</code> is non-<code>NIL</code>, the waiting time is limited to
<code>cnt</code> milliseconds. Returns the result of <code>prg</code>. See also
<code><a href="refK.html#key">key</a></code> and <code><a
href="refS.html#sync">sync</a></code>.
<pre>
: (wait 2000) # Wait 2 seconds
-> NIL
: (prog
(zero *Cnt)
(setq *Run # Install background loop
'((-2000 0 (println (inc '*Cnt)))) ) # Increment '*Cnt' every 2 sec
(wait NIL (> *Cnt 6)) # Wait until > 6
(off *Run) )
1 # Waiting ..
2
3
4
5
6
7
-> NIL
</pre></dd>
<dt><a id="week"><code>(week 'dat) -> num</code></a></dt>
<dd>Returns the number of the week for a given <code><a
href="refD.html#date">date</a></code> <code>dat</code>. See also <code><a
href="refD.html#day">day</a></code>, <code><a
href="refU.html#ultimo">ultimo</a></code>, <code><a
href="refD.html#datStr">datStr</a></code> and <code><a
href="refS.html#strDat">strDat</a></code>.
<pre>
: (datStr (date))
-> "2007-06-01"
: (week (date))
-> 22
</pre></dd>
<dt><a id="when"><code>(when 'any . prg) -> any</code></a></dt>
<dd>Conditional execution: When the condition <code>any</code> evaluates to
non-<code>NIL</code>, <code>prg</code> is executed and the result is returned.
Otherwise <code>NIL</code> is returned. See also <code><a
href="refU.html#unless">unless</a></code>, <code><a
href="refI.html#if">if</a></code>, <code><a href="refA.html#and">and</a></code>
and <code><a href="refC.html#cond">cond</a></code>.
<pre>
: (when (> 4 3) (println 'OK) (println 'Good))
OK
Good
-> Good
</pre></dd>
<dt><a id="while"><code>(while 'any . prg) -> any</code></a></dt>
<dd>Conditional loop: While the condition <code>any</code> evaluates to
non-<code>NIL</code>, <code>prg</code> is repeatedly executed. If
<code>prg</code> is never executed, <code>NIL</code> is returned. Otherwise the
result of <code>prg</code> is returned. See also <code><a
href="refU.html#until">until</a></code>, <code><a
href="refF.html#for">for</a></code>, <code><a
href="refL.html#loop">loop</a></code> and <code><a
href="refD.html#do">do</a></code>.
<pre>
: (while (read)
(println 'got: @) )
abc
got: abc
1234
got: 1234
NIL
-> 1234
</pre></dd>
<dt><a id="what"><code>(what 'sym) -> lst</code></a></dt>
<dd>(Debug mode only) Returns a list of all internal symbols that match the
pattern string <code>sym</code>. See also <code><a
href="refM.html#match">match</a></code>, <code><a
href="refW.html#who">who</a></code>, <code><a
href="refH.html#has">has</a></code> and <code><a
href="refC.html#can">can</a></code>.
<pre>
: (what "cd@dr")
-> (cdaddr cdaadr cddr cddddr cdddr cddadr cdadr)
</pre></dd>
<dt><a id="who"><code>(who 'any) -> lst</code></a></dt>
<dd>(Debug mode only) Returns a list of all functions or method definitions that
contain the atom or pattern <code>any</code>. See also <code><a
href="refM.html#match">match</a></code>, <code><a
href="refW.html#what">what</a></code>, <code><a
href="refH.html#has">has</a></code> and <code><a
href="refC.html#can">can</a></code>.
<pre>
: (who 'caddr) # Who is using 'caddr'?
-> ($dat lint1 expDat datStr $tim tim$ mail _gen dat$ datSym)
: (who "Type error")
-> ((mis> . +Link) *Uni (mis> . +Joint))
: (more (who "Type error") pp) # Pretty print all results
(dm (mis> . +Link) (Val Obj)
(and
Val
(nor (isa (: type) Val) (canQuery Val))
"Type error" ) )
. # Stop
-> T
</pre></dd>
<dt><a id="wipe"><code>(wipe 'sym|lst) -> sym|lst</code></a></dt>
<dd>Clears the <code>VAL</code> and the property list of <code>sym</code>, or of
all symbols in the list <code>lst</code>. When a symbol is an external symbol,
its state is also set to "not loaded". Does nothing when <code>sym</code> is an
external symbol that has been modified or deleted ("dirty").
<pre>
: (setq A (1 2 3 4))
-> (1 2 3 4)
: (put 'A 'a 1)
-> 1
: (put 'A 'b 2)
-> 2
: (show 'A)
A (1 2 3 4)
b 2
a 1
-> A
: (wipe 'A)
-> A
: (show 'A)
A NIL
-> A
</pre></dd>
<dt><a id="with"><code>(with 'any . prg) -> any</code></a></dt>
<dd>Saves the current object <code><a
href="refT.html#This">This</a></code> and sets it to the new value
<code>any</code>. Then <code>prg</code> is executed, and
<code>This</code> is restored to its previous value. The return value is
the result of <code>prg</code>. Used typically to access the local data
of <code>var</code> in the same manner as inside a method body.
<code>prg</code> is not executed (and <code>NIL</code> is returned) when
<code>var</code> is <code>NIL</code>. <code>(with 'X . prg)</code> is
equivalent to <code>(let? This 'X . prg)</code>. See also <code><a
href="refT.html#this">this</a></code>.
<pre>
: (put 'X 'a 1)
-> 1
: (put 'X 'b 2)
-> 2
: (with 'X (list (: a) (: b)))
-> (1 2)
</pre></dd>
<dt><a id="wr"><code>(wr 'cnt ..) -> cnt</code></a></dt>
<dd>Writes all <code>cnt</code> arguments as raw bytes to the current output
channel. See also <code><a href="refR.html#rd">rd</a></code> and <code><a
href="refP.html#pr">pr</a></code>.
<pre>
: (out "x" (wr 1 255 257)) # Write to "x"
-> 257
: (hd "x")
00000000 01 FF 01 ...
-> NIL
</pre></dd>
<dt><a id="wrap"><code>(wrap 'cnt 'lst) -> sym</code></a></dt>
<dt><code>(wrap 'cnt 'sym) -> lst</code></dt>
<dd>The first form returns a transient symbol with all characters in
<code>lst</code> <code><a href="refP.html#pack">pack</a></code>ed in lines with
a maximal length of <code>cnt</code>. The second form converts a symbol to a
list of transient symbols each with a maximal length of <code>cnt</code>. See
also <code><a href="refT.html#tab">tab</a></code>, <code><a
href="refA.html#align">align</a></code> and <code><a
href="refC.html#center">center</a></code>.
<pre>
: (wrap 20 (chop "The quick brown fox jumps over the lazy dog"))
-> "The quick brown fox^Jjumps over the lazy^Jdog"
: (wrap 8 (chop "The quick brown fox jumps over the lazy dog"))
-> "The^Jquick^Jbrown^Jfox^Jjumps^Jover the^Jlazy dog"
: (wrap 8 "The quick brown fox jumps over the lazy dog")
-> ("The" "quick" "brown" "fox" "jumps" "over the" "lazy dog")
</pre></dd>
</dl>
</body>
</html>
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