/**
* get the diff as a table of lines
*
* @param string a file name of the original content
* @param string a file for the updated content
* @return an ASCII string
*/
public static function diff($original, $updated)
{
global $context;
// read the original file
$stat = Safe::stat($context['path_to_root'] . $original);
if (!is_array($stat)) {
return sprintf(i18n::s('Impossible to read %s.'), $original);
}
$original_lines = Safe::file($context['path_to_root'] . $original);
// read the updated file
$stat = Safe::stat($context['path_to_root'] . $updated);
if (!is_array($stat)) {
return sprintf(i18n::s('Impossible to read %s.'), $updated);
}
$updated_lines = Safe::file($context['path_to_root'] . $updated);
// compare the two sequences
$sequence = Scripts::compare($original_lines, $updated_lines);
// format the output string
$text = '';
foreach ($sequence as $item) {
list($tag, $left, $right) = $item;
$text .= Scripts::adjust(' ' . $tag, 5) . ' ' . Scripts::adjust($left) . ' ' . Scripts::adjust($right) . "\n";
}
// return the result of the whole comparison
$text = Scripts::adjust(i18n::s('Delta'), 5) . ' ' . Scripts::adjust($original) . ' ' . Scripts::adjust($updated) . "\n" . str_replace("\t", ' ', $text) . "\n";
return $text;
}
