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<!DOCTYPE html>
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<head>
<title>Monadic Formatting</title>
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<h1>SRFI 166: Monadic Formatting</h1>
<p class="authors">by Alex Shinn</p>
<p class="based-on"></p>
<p class="status">status: <em>final</em> (2020-07-30)</p>
<p class="keywords">keywords: <a href="https://srfi.schemers.org/?keywords=i/o">I/O</a></p><span class="see-also">See also <a href="/srfi-13/">SRFI 13: String Libraries</a>, <a href="/srfi-159/">SRFI 159: Combinator Formatting</a>, and <a href="/srfi-165/">SRFI 165: The Environment Monad</a>.</span>
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<li><a href="srfi-166.html">The SRFI Document</a></li>
<li><a href="https://srfi-email.schemers.org/srfi-166/">Discussion Archive</a></li>
<li><a href="https://github.com/scheme-requests-for-implementation/srfi-166">Git repo (on Github)</a></li>
<li>
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<h2>Abstract</h2><p>
A library of procedures for formatting Scheme objects to text in
various ways, and for easily concatenating, composing and extending
these formatters efficiently without resorting to capturing and
manipulating intermediate strings.</p>
<p>
This SRFI is an updated version of SRFI 159, primarily with the
difference that state variables are hygienic.</p>
<p>
Summary of differences from SRFI 159:
<ul>
<li>State variables are first class and hygienic</li>
<li>Added <code>written-shared</code>, <code>pretty-shared</code></li>
<li>Added <code>as-italic</code>, <code>as-color</code>, <code>as-true-color</code>, <code>on-<i>color</i></code> background variants, and <code>pretty-with-color</code></li>
<li>Added <code>ambiguous-is-wide?</code> state variable and <code>string-terminal-width/wide</code> utility</li>
<li>Added <code>substring/width</code> state var for width-aware substring operations, with <code>substring-terminal-width(/wide)</code> utilities</li>
<li>Added <code>substring/preserve</code> state var used in trimming, with <code>substring-terminal-preserve</code> utility</li>
<li>Added <code>pretty-environment</code> state variable</li>
<li>Renamed <code>as-unicode</code> to <code>terminal-aware</code></li>
<li>Restored non-uniform comma rules as needed in India</li>
<li>Restored <code>upcased</code> and <code>downcased</code></li>
<li>Several clarifications and more examples</li>
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