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Draft bash comparison #50

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18 changes: 17 additions & 1 deletion doc/base.html
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Expand Up @@ -62,6 +62,17 @@
border: 1px solid black;
}

#bash-table td, #bash-table th {
overflow: hidden;
border: 1px solid black;
padding: 1em;
}

#bash-table {
border-collapse: collapse;
border: 1px solid black;
}


nav {
flex-basis: 18rem;
Expand Down Expand Up @@ -96,14 +107,18 @@
}

#content-div {
width: 45em;
<!-- width: 45em; -->
margin-bottom: 10em;
}

code {
font-size: 1.2em;
}

p {
width: 45em;
}

.nav-ul {
list-style-type: none;
margin: 0;
Expand Down Expand Up @@ -210,6 +225,7 @@ <h1>mshell</h1>
<a href="examples.html">Examples</a>
<ul class="nav-ul nav-sub">
<li><a href="examples.html#vs-awk">vs. awk</a></li>
<li><a href="examples.html#vs-bash">vs. bash</a></li>
</ul>
</li>
<li>
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107 changes: 107 additions & 0 deletions doc/examples.inc.html
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Expand Up @@ -285,3 +285,110 @@ <h2 id="vs-awk">Versus Awk</h2>

</tbody>
</table>

<h2 id="vs-bash">Versus Bash</h2>

<p>
Where <code>bash</code> relies on an expansion phase, <code>mshell</code> keeps data on the stack and uses explicit operators.
The snippets below show how to approach familiar shell tasks.
</p>

<!-- <table id="bash-table" style="table-layout: fixed; width: 1200px;"> -->
<table id="bash-table" >
<!-- <colgroup> -->
<!-- <col style="width: 15%;"> -->
<!-- <col style="width: 30%;"> -->
<!-- <col style="width: 35%;"> -->
<!-- <col style="width: 20%;"> -->
<!-- </colgroup> -->
<thead>
<tr> <th>Topic</th> <th>bash</th> <th>mshell</th> <th>Notes</th> </tr>
</thead>
<tbody>
<tr>
<td>Brace expansion</td>
<td>
<pre><code class="language-bash">touch backup_{1..3}.tar.gz</code></pre>
</td>
<td>
<pre><code class="language-mshell">3 seq (
idx!
[ 'touch' $"backup_{@idx 1 + str}.tar.gz" ] ;
) each</code></pre>
</td>
<td>Generate filenames explicitly, then run the command for each item.</td>
</tr>
<tr>
<td>Tilde expansion</td>
<td>
<pre><code class="language-bash">grep -R "TODO" ~/projects</code></pre>
</td>
<td>
<pre><code class="language-mshell">[ 'grep' '-R' 'TODO' ~/projects ] ;</code></pre>
</td>
<td>Tokens that begin with <code>~/</code> resolve to the user's home directory.</td>
</tr>
<tr>
<td>Parameter expansion</td>
<td>
<pre><code class="language-bash">ls "${LOG_DIR:-/var/log}"</code></pre>
</td>
<td>
<pre><code class="language-mshell">$LOG_DIR? ( $LOG_DIR ) ( '/var/log' ) iff logDir!
[ 'ls' ] @logDir append ;</code></pre>
</td>
<td>Use <code>iff</code> (if/else) to choose defaults while keeping values on the stack.</td>
</tr>
<tr>
<td>Command substitution</td>
<td>
<pre><code class="language-bash">files=$(find src -type f -name '*.msh')
printf '%s\n' "$files"</code></pre>
</td>
<td>
<pre><code class="language-mshell">[ 'find' 'src' '-type' 'f' '-name' '*.msh' ] * &gt; ; lines files!
@files len count!
$"Found {@count} source files" wl</code></pre>
</td>
<td><code>* &gt;</code> keeps stdout as a string; <code>lines</code> turns it into a list for further work.</td>
</tr>
<tr>
<td>Arithmetic expansion</td>
<td>
<pre><code class="language-bash">truncate -s $((512 * 1024)) disk.img</code></pre>
</td>
<td>
<pre><code class="language-mshell">512 1024 * size!
@size str sizeStr!
[ 'truncate' '-s' @sizeStr 'disk.img' ] ;</code></pre>
</td>
<td>Apply numeric operators directly, then convert to strings when composing arguments.</td>
</tr>
<tr>
<td>Process substitution</td>
<td>
<pre><code class="language-bash">diff &lt;(sort errors.log) &lt;(sort errors.log.prev)</code></pre>
</td>
<td>
<pre><code class="language-mshell">[ 'sort' 'errors.log' ] * &gt; ; psub left!
[ 'sort' 'errors.log.prev' ] * &gt; ; psub right!
[ 'diff' ] @left append @right append ;</code></pre>
</td>
<td><code>psub</code> writes captured output to a temporary file and returns the path.</td>
</tr>
<tr>
<td>Redirections</td>
<td>
<pre><code class="language-bash">printf 'status\n' &gt; /tmp/report.txt
grep status &lt; /tmp/report.txt</code></pre>
</td>
<td>
<pre><code class="language-mshell">[ 'printf' 'status\n' ] `/tmp/report.txt` &gt; ;
[ 'grep' 'status' ] `/tmp/report.txt` &lt; * &gt; ; lines matches!
@matches len total!
$"Matched {@total} lines" wl</code></pre>
</td>
<td>Use path literals with <code>&gt;</code>/<code>&lt;</code>; combine with <code>* &gt;</code> and <code>lines</code> when you want to reuse the output.</td>
</tr>
</tbody>
</table>