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<h1>The International Obfuscated C Code Contest</h1>
<h2>prog.html for 2024/howe</h2>
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<h1 id="eh1">eh(1)</h1>
<h2 id="name">NAME</h2>
<p>eh - Edit Here - vi(1) the good parts version</p>
<h2 id="synopsis">SYNOPSIS</h2>
<p>eh filename</p>
<h2 id="description">DESCRIPTION</h2>
<p>A minimalist version of <code>vi(1)</code>. It is an example of the “Buffer Gap” method outlined in the <a href="http://www.finseth.com/craft/">The Craft Of Text Editing</a> used by many Emacs style editors. (Yep I mixed <code>vi</code> and <code>emacs</code> in the same paragraph; I’m going to hell for that one.)</p>
<p>Create or read a text file to edit. Text files consists of lines of printable UTF-8 text, tabs, or newline characters. A physical line can be of arbitrary length and is delimited by either a newline or the end of file. Tab stops are every eight columns. The behaviour of non-printable characters may vary depending on the implementation of the Curses library, <code>stty(1)</code> settings, or terminal emulator.</p>
<h2 id="commands">COMMANDS</h2>
<p>The commands are similar, but not the same as <code>vi(1)</code>. Most commands can be prefixed by a repeat count, eg. <code>5w</code>, <code>123G</code>, <code>2dw</code> (<code>d2w</code>), or <code>2d3w</code> (<code>d6w</code>). Motion commands, optionally prefixed by a count, are those that move the cursor without modifying the buffer. Some edit commands can be followed by a motion.</p>
<p>h j k l Left, down, up, right cursor movement.
H J K L Page top, page down, page up, page bottom.
b w Word left, word right.
| Goto column (count) of physical line.
/ERE Find first occurrence of ERE pattern after the cursor.
n Find next occurrence of ERE.
G Goto line (count) number; <strong>1G</strong> top of file, <strong>G</strong> bottom.
  Toggle text selection.
d motion Delete text selection or region given by motion.
y motion Yank (copy) text selection or region given by motion.
P Paste last deleted or yanked text region before the cursor.
i Insert text mode before the cursor, <strong>ESC</strong> or <strong>CTRL+C</strong> ends insert.
u Toggle undo of last edit.
x Delete character after the cursor, i.e., <strong>dl</strong>
W Write buffer to file.
Q Quit.
CTRL+C Quit.</p>
<p>Any other key will redraw the screen.</p>
<h2 id="environment">ENVIRONMENT</h2>
<ul>
<li><p><code>TERM</code> : The user’s terminal type. If the environmental variable <code>TERM</code> is not set or insufficient then terminate with non-zero exit status.</p></li>
<li><p><code>TERMINFO</code> : The absolute file path of a <code>terminfo</code> database. See <code>terminfo(5)</code>.</p></li>
</ul>
<h2 id="exit-status">EXIT STATUS</h2>
<ul>
<li>0 Success</li>
<li>1 Insufficient capabilities for <code>TERM</code>.</li>
<li>2 Read file error</li>
</ul>
<h2 id="see-also">SEE ALSO</h2>
<p><code>ed(1)</code>, <code>ex(1)</code>, <code>vi(1)</code></p>
<h2 id="notes">NOTES</h2>
<ul>
<li><p>Has UTF-8 support.</p>
<ul>
<li>Loads UTF-8 files as-is and internally remains UTF-8 (not converted to <code>wchar_t</code>).</li>
<li>UTF-8 input will likely require an intl. keyboard or enabling <a href="https://en.wikipedia.org/wiki/QWERTY#US-International">US Intl. dead-key keyboard</a> support. See also <a href="https://en.wikipedia.org/wiki/Unicode_input">Unicode Input</a>.</li>
</ul></li>
<li><p>The display of long physical lines that are larger than the terminal screen is untested, so considered undefined.</p></li>
<li><p>CRLF newlines (DOS, Windows) and other non-spacing control characters are not visible. Consider converting newlines using SUS tools like <code>awk(1)</code> or <code>sed(1)</code>:</p>
<p>$ sed -e’s/<sup>V</sup>M$//’ dos.txt &gt; unix.txt
$ sed -e’s/$/<sup>V</sup>M/’ unix.txt &gt; dos.txt</p>
<p><code>^V</code> is the default <code>stty(1)</code> insert literal prefix key.</p></li>
</ul>
<h2 id="references">REFERENCES</h2>
<ul>
<li><p>Craig A. Finseth, “Craft Of Text Editing”, 1999
<a href="http://www.finseth.com/craft/" class="uri">http://www.finseth.com/craft/</a></p></li>
<li><p>Single Unix Specification, Curses issue 7
<a href="https://pubs.opengroup.org/onlinepubs/9699909599/toc.pdf" class="uri">https://pubs.opengroup.org/onlinepubs/9699909599/toc.pdf</a></p></li>
<li><p>Single Unix Specification, Base Specification 2018, vi(1)
<a href="https://pubs.opengroup.org/onlinepubs/9699919799/utilities/vi.html" class="uri">https://pubs.opengroup.org/onlinepubs/9699919799/utilities/vi.html</a>
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