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<h4 class="subsection" id="Leading-Space-Traps-1">5.28.4 Leading Space Traps</h4>
<a class="index-entry-id" id="index-leading-space-traps"></a>
<a class="index-entry-id" id="index-traps_002c-leading-space"></a>
<dl class="first-deffn">
<dt class="deffn" id="index-_002elsm"><span class="category-def">Request: </span><span><strong class="def-name"><code class="t">.lsm</code></strong> <var class="def-var-arguments">[<span class="r"><i class="slanted">name</i></span>]</var><a class="copiable-link" href='#index-_002elsm'> ¶</a></span></dt>
<dd><a class="index-entry-id" id="index-lsm"></a>
</dd><dt class="deffnx def-cmd-deffn" id="index-_005cn_005blsn_005d"><span class="category-def">Register: </span><span><strong class="def-name"><code class="t">\n[lsn]</code></strong><a class="copiable-link" href='#index-_005cn_005blsn_005d'> ¶</a></span></dt>
<dd><a class="index-entry-id" id="index-lsn"></a>
</dd><dt class="deffnx def-cmd-deffn" id="index-_005cn_005blss_005d"><span class="category-def">Register: </span><span><strong class="def-name"><code class="t">\n[lss]</code></strong><a class="copiable-link" href='#index-_005cn_005blss_005d'> ¶</a></span></dt>
<dd><a class="index-entry-id" id="index-lss"></a>
<a class="index-entry-id" id="index-leading-spaces-macro-_0028lsm_0029"></a>
<p>Set a leading space trap, calling the macro <var class="var">name</var> when GNU
<code class="code">troff</code> encounters leading spaces in an input line; the implicit
line break that normally happens in this case is suppressed. If no
argument is supplied, the default leading space behavior is
(re-)established (see <a class="pxref" href="Breaking.html">Breaking</a>).
</p>
<p>The count of leading spaces on an input line is stored in register
<code class="code">lsn</code>, and the amount of corresponding horizontal motion in
register <code class="code">lss</code>, irrespective of whether a leading space trap is
set. When it is, the leading spaces are removed from the input line,
and no motion is produced before calling <var class="var">name</var>.
</p>
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