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edit.html
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<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>Edit blocks in place</title>
<link rel="stylesheet" type="text/css" href="slides/slides.css"></head>
<body>
<h1>Edit blocks in place</h1>
<div class="slides">
<div class="page">
<div class="slide slide-header"><div class="slide-nr">1</div><div class="headers">
<h1>Edit blocks in place</h1>
</div></div>
<ul><li>
using a terminal editor to edit blocks
</li></ul>
</div>
<div class="page"><div class="slide"><div class="slide-nr">2</div>
<code>
<span class="macro">@Add(<span class="name">global elements</span>)</span><br/>
<span class="in1"></span><span class="type">void</span> <span class="fn">insert_before</span>(<span class="type">const</span> <span class="type">std</span>::<span class="type">string</span> &<span class="var">prefix</span>,<br/>
<span class="in2"></span><span class="type">std</span>::<span class="type">vector</span><<span class="type">std</span>::<span class="type">string</span>> &<span class="var">c</span><br/>
<span class="in1"></span>) {<br/>
<span class="in2"></span><span class="macro">@put(<span class="name">insert before</span>)</span>;<br/>
<span class="in1"></span>}<br/>
<span class="macro">@End(<span class="name">global elements</span>)</span><br/>
</code></div>
<ul><li>
function to interactively insert lines at the end of the container
</li><li>
the <code><span class="var">prefix</span></code> is the prompt that is printed
</li></ul>
</div>
<div class="page"><div class="slide"><div class="slide-nr">3</div>
<code>
<span class="macro">@Add(<span class="name">run loop</span>)</span><br/>
<span class="in1"></span><span class="keyword">if</span> (<span class="var">cmd</span> == <span class="str">"l"</span> || <span class="var">cmd</span> == <span class="str">"list"</span>) {<br/>
<span class="in2"></span><span class="fn">insert_before</span>(<span class="str">"l"</span>, <span class="var">curBlock</span>-><span class="var">notes</span>);<br/>
<span class="in2"></span><span class="keyword">continue</span>;<br/>
<span class="in1"></span>}<br/>
<span class="macro">@End(<span class="name">run loop</span>)</span><br/>
</code></div>
<ul><li>
the <code><span class="type">list</span></code> or <code><span class="var">l</span></code> command adds notes
</li></ul>
</div>
<div class="page"><div class="slide"><div class="slide-nr">4</div>
<code>
<span class="macro">@Add(<span class="name">run loop</span>)</span><br/>
<span class="in1"></span><span class="keyword">if</span> (<span class="var">cmd</span> == <span class="str">"a"</span> || <span class="var">cmd</span> == <span class="str">"add"</span>) {<br/>
<span class="in2"></span><span class="type">std</span>::<span class="type">string</span> <span class="var">prefix</span>;<br/>
<span class="in2"></span><span class="macro">@put(<span class="name">find add prefix</span>)</span>;<br/>
<span class="in2"></span><span class="fn">insert_before</span>(<span class="var">prefix</span>, <span class="var">curBlock</span>-><span class="var">value</span>);<br/>
<span class="in2"></span><span class="keyword">continue</span>;<br/>
<span class="in1"></span>}<br/>
<span class="macro">@End(<span class="name">run loop</span>)</span><br/>
</code></div>
<ul><li>
the <code><span class="var">add</span></code> or <code><span class="var">a</span></code> command adds value lines
</li></ul>
</div>
<div class="page"><div class="slide"><div class="slide-nr">5</div>
<code>
<span class="macro">@def(<span class="name">find add prefix</span>)</span><br/>
<span class="in1"></span><span class="keyword">switch</span> (<span class="var">curBlock</span>-><span class="var">state</span>) {<br/>
<span class="in2"></span><span class="keyword">case</span> <span class="var">RS</span>::<span class="var">header</span>:<br/>
<span class="in3"></span><span class="var">prefix</span> = <span class="str">"h"</span>; <span class="keyword">break</span>;<br/>
<span class="in2"></span><span class="keyword">case</span> <span class="var">RS</span>::<span class="var">code</span>:<br/>
<span class="in3"></span><span class="var">prefix</span> = <span class="str">"c"</span>; <span class="keyword">break</span>;<br/>
<span class="in2"></span><span class="keyword">case</span> <span class="var">RS</span>::<span class="var">para</span>:<br/>
<span class="in3"></span><span class="var">prefix</span> = <span class="str">"p"</span>; <span class="keyword">break</span>;<br/>
<span class="in2"></span><span class="keyword">default</span>:<br/>
<span class="in3"></span><span class="var">prefix</span> = <span class="str">"?"</span>; <span class="keyword">break</span>;<br/>
<span class="in1"></span>}<br/>
<span class="macro">@end(<span class="name">find add prefix</span>)</span><br/>
</code></div>
<ul><li>
one character prefix for the different block types
</li></ul>
</div>
<div class="page"><div class="slide"><div class="slide-nr">6</div>
<code>
<span class="macro">@def(<span class="name">insert before</span>)</span><br/>
<span class="in1"></span><span class="type">int</span> <span class="var">next</span> = <span class="var">c</span>.<span class="fn">size</span>();<br/>
<span class="in1"></span><span class="macro">@Put(<span class="name">do str range</span>)</span>;<br/>
<span class="in1"></span><span class="type">std</span>::<span class="type">string</span> <span class="var">l</span>;<br/>
<span class="in1"></span><span class="keyword">for</span> (;;) {<br/>
<span class="in2"></span><span class="macro">@put(<span class="name">insert next line</span>)</span>;<br/>
<span class="in2"></span><span class="keyword">break</span>;<br/>
<span class="in1"></span>}<br/>
<span class="in1"></span><span class="fn">draw_block</span>();<br/>
<span class="macro">@end(<span class="name">insert before</span>)</span><br/>
</code></div>
<ul><li>
insert strings at the end of the container
</li></ul>
</div>
<div class="page"><div class="slide"><div class="slide-nr">7</div>
<code>
<span class="macro">@def(<span class="name">insert next line</span>)</span><br/>
<span class="in1"></span><span class="type">std</span>::<span class="var">cout</span> << <span class="var">prefix</span> << <span class="str">' '</span> << (<span class="var">next</span> + <span class="num">1</span>) << <span class="str">"? "</span>;<br/>
<span class="in1"></span><span class="type">std</span>::<span class="fn">getline</span>(<span class="type">std</span>::<span class="var">cin</span>, <span class="var">l</span>);<br/>
<span class="in1"></span><span class="type">auto</span> <span class="var">b</span> = <span class="var">l</span>.<span class="fn">begin</span>();<br/>
<span class="in1"></span><span class="type">auto</span> <span class="var">e</span> = <span class="var">l</span>.<span class="fn">end</span>();<br/>
<span class="in1"></span><span class="keyword">while</span> (<span class="var">b</span> != <span class="var">e</span> && *<span class="var">b</span> <= <span class="str">' '</span>) { ++<span class="var">b</span>; }<br/>
<span class="in1"></span><span class="type">std</span>::<span class="type">string</span> <span class="var">t</span> { <span class="var">b</span>, <span class="var">e</span> };<br/>
<span class="in1"></span><span class="keyword">if</span> (<span class="var">t</span>.<span class="fn">empty</span>()) { <span class="keyword">continue</span>; }<br/>
<span class="in1"></span><span class="keyword">if</span> (<span class="var">t</span> == <span class="str">"."</span>) { <span class="keyword">break</span>; }<br/>
<span class="in1"></span><span class="var">c</span>.<span class="fn">insert</span>(<span class="var">c</span>.<span class="fn">begin</span>() + <span class="var">next</span>, <span class="var">l</span>);<br/>
<span class="in1"></span>++<span class="var">next</span>;<br/>
<span class="in1"></span><span class="keyword">continue</span>;<br/>
<span class="macro">@end(<span class="name">insert next line</span>)</span><br/>
</code></div>
<ul><li>
read lines until a single <code>.</code> is read
</li><li>
spaces at the beginning of the line are stripped
</li></ul>
</div>
<div class="page"><div class="slide"><div class="slide-nr">8</div>
<code>
<span class="macro">@Add(<span class="name">run loop</span>)</span><br/>
<span class="in1"></span><span class="keyword">if</span> (<span class="var">cmd</span> == <span class="str">">>"</span>) {<br/>
<span class="in2"></span><span class="keyword">if</span> (<span class="var">curBlock</span>-><span class="var">state</span> == <span class="var">RS</span>::<span class="var">header</span>) {<br/>
<span class="in3"></span>++<span class="var">curBlock</span>-><span class="var">level</span>;<br/>
<span class="in3"></span><span class="fn">draw_block</span>();<br/>
<span class="in3"></span><span class="keyword">continue</span>;<br/>
<span class="in2"></span>}<br/>
<span class="in1"></span>}<br/>
<span class="macro">@End(<span class="name">run loop</span>)</span><br/>
</code></div>
<ul><li>
<code>>></code> increases the level of a header
</li></ul>
</div>
<div class="page"><div class="slide"><div class="slide-nr">9</div>
<code>
<span class="macro">@Add(<span class="name">run loop</span>)</span><br/>
<span class="in1"></span><span class="keyword">if</span> (<span class="var">cmd</span> == <span class="str">"<<"</span>) {<br/>
<span class="in2"></span><span class="keyword">if</span> (<span class="var">curBlock</span>-><span class="var">level</span> > <span class="num">1</span>) {<br/>
<span class="in3"></span>--<span class="var">curBlock</span>-><span class="var">level</span>;<br/>
<span class="in3"></span><span class="fn">draw_block</span>();<br/>
<span class="in3"></span><span class="keyword">continue</span>;<br/>
<span class="in2"></span>}<br/>
<span class="in1"></span>}<br/>
<span class="macro">@End(<span class="name">run loop</span>)</span><br/>
</code></div>
<ul><li>
<code><<</code> decreases the level of a header
</li></ul>
</div>
</body>
</html>