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Commit 2de6fe0b authored by friendica's avatar friendica

add chord generator addon

parent b059b2de
File added
Chord Generator
===============
Before enabling the plugin compile the chord generator binary.
g++ chord-generator.cpp -o chord
The example is for Linux. Compilation instructions may vary on Windows or other platforms.
File added
This diff is collapsed.
<?php
/**
* Name: Chord Generator
* Description: Guitar Chord Generator Application
* Version: 1.0
* Author: Mike Macgirvin <mike@zothub.com>
*/
function chords_load() {
register_hook('app_menu', 'addon/chords/chords.php', 'chords_app_menu');
}
function chords_unload() {
unregister_hook('app_menu', 'addon/chords/chords.php', 'chords_app_menu');
}
function chords_app_menu($a,&$b) {
$b['app_menu'][] = '<div class="app-title"><a href="chords">Guitar Chords</a></div>';
}
function chords_module() {}
function chords_content($a) {
$o .= '<h3>Guitar Chords</h3>';
$o .= 'The complete online guitar chord dictionary<br />';
$args = '';
$l = '';
if($_SERVER['REQUEST_METHOD'] == 'POST') {
if(isset($_POST['chord']) && strlen($_POST['chord']))
$args .= escapeshellarg(ucfirst(trim($_POST['chord'])));
if((strlen($args)) && (isset($_POST['tuning'])) && (strlen($_POST['tuning'])))
$args .= ' '.escapeshellarg($_POST['tuning']);
if((strlen($args)) && (isset($_POST['lefty'])))
$args .= ' lefty';
}
if((! strlen($args)) && (! stristr(basename($_SERVER['QUERY_STRING']),'chords')) && strlen(basename($_SERVER['QUERY_STRING'])))
$args = escapeshellarg(ucfirst(basename($_SERVER['QUERY_STRING'])));
$tunings = array("","openg", "opene", "dadgad");
$tnames = array("Em11 [Standard] (EADGBE)",
"G/D [Drop D] (DGDGBD)","Open E (EBEG#BE)","Dsus4 (DADGAD)");
$t = ((isset($_POST['tuning'])) ? $_POST['tuning'] : '');
if(isset($_POST['lefty']) && $_POST['lefty'] == '1')
$l = 'checked="checked"';
$ch = ((isset($_POST['chord'])) ? $_POST['chord'] : '');
$o .= <<< EOT
<form action="chords" method="post">
Chord name: (ex: Em7) <input type="text" name="chord" value="$ch" onfocus="this.select();" size="16" />
&nbsp;&nbsp;Tuning: <select name="tuning" size="5">
EOT;
for($x = 0; $x < count($tunings); $x ++) {
$o .= '<option value="'.$tunings[$x].'"'.
(($tunings[$x] == $t) ? 'selected="selected"' : '').
'>'.$tnames[$x].'</option>';
}
$o .= <<< EOT
</select>
Left-Handed: <input type="checkbox" name="lefty" value="1" $l />
<br />
<input type="submit" name="submit" value="Submit" />
</form>
<br /><br />
EOT;
if(strlen($args)) {
$o .= '<pre>';
$o .= shell_exec("addon/chords/chord ".$args);
$o .= '</pre>';
}
else {
$o .= <<< EOT
<p>
This is a fairly comprehensive and complete guitar chord dictionary which will list most of the available ways to play a certain chord, starting from the base of the fingerboard up to a few frets beyond the twelfth fret (beyond which everything repeats). A couple of non-standard tunings are provided for the benefit of slide players, etc.
<p />
<p>
Chord names start with a root note (A-G) and may include sharps (#) and flats (b). This software will parse most of the standard naming conventions such as maj, min, dim, sus(2 or 4), aug, with optional repeating elements.
</p>
<p>
Valid examples include A, A7, Am7, Amaj7, Amaj9, Ammaj7, Aadd4, Asus2Add4, E7b13b11 ...
</p>
Quick Reference:<br />
EOT;
$keys = array('A','Bb','B', 'C','Db','D','Eb','E','F','Gb','G','Ab');
$o .= '<table border="1">';
$o .= "<tr>";
foreach($keys as $k)
$o .= "<td><a href=\"chords/$k\"> $k </a></td>";
$o .= "</tr><tr>";
foreach($keys as $k)
$o .= "<td><a href=\"chords/{$k}m\"> {$k}m </a></td>";
$o .= "</tr><tr>";
foreach($keys as $k)
$o .= "<td><a href=\"chords/{$k}7\"> {$k}7 </a></td>";
$o .= "</tr>";
$o .= "</table>";
}
return $o;
}
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