UnifiedDiffFormatter.php

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<?php
class UnifiedDiffFormatter extends DiffFormatter {

    protected $leadingContextLines = 2;

    protected $trailingContextLines = 2;

    protected function added( $lines ) {
        $this->lines( $lines, '+' );
    }

    protected function deleted( $lines ) {
        $this->lines( $lines, '-' );
    }

    protected function changed( $orig, $closing ) {
        $this->deleted( $orig );
        $this->added( $closing );
    }

    protected function blockHeader( $xbeg, $xlen, $ybeg, $ylen ) {
        return "@@ -$xbeg,$xlen +$ybeg,$ylen @@";
    }

}