minify.php

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<?php
require_once __DIR__ . '/Maintenance.php';

class MinifyScript extends Maintenance {
    public $outDir;

    public function __construct() {
        parent::__construct();
        $this->addOption( 'outfile',
            'File for output. Only a single file may be specified for input.',
            false, true );
        $this->addOption( 'outdir',
            "Directory for output. If this is not specified, and neither is --outfile, then the\n" .
            "output files will be sent to the same directories as the input files.",
            false, true );
        $this->addDescription( "Minify a file or set of files.\n\n" .
            "If --outfile is not specified, then the output file names will have a .min extension\n" .
            "added, e.g. jquery.js -> jquery.min.js."
        );
    }

    public function execute() {
        if ( !count( $this->mArgs ) ) {
            $this->error( "minify.php: At least one input file must be specified." );
            exit( 1 );
        }

        if ( $this->hasOption( 'outfile' ) ) {
            if ( count( $this->mArgs ) > 1 ) {
                $this->error( '--outfile may only be used with a single input file.' );
                exit( 1 );
            }

            // Minify one file
            $this->minify( $this->getArg( 0 ), $this->getOption( 'outfile' ) );

            return;
        }

        $outDir = $this->getOption( 'outdir', false );

        foreach ( $this->mArgs as $arg ) {
            $inPath = realpath( $arg );
            $inName = basename( $inPath );
            $inDir = dirname( $inPath );

            if ( strpos( $inName, '.min.' ) !== false ) {
                $this->error( "Skipping $inName\n" );
                continue;
            }

            if ( !file_exists( $inPath ) ) {
                $this->error( "File does not exist: $arg", true );
            }

            $extension = $this->getExtension( $inName );
            $outName = substr( $inName, 0, -strlen( $extension ) ) . 'min.' . $extension;
            if ( $outDir === false ) {
                $outPath = $inDir . '/' . $outName;
            } else {
                $outPath = $outDir . '/' . $outName;
            }

            $this->minify( $inPath, $outPath );
        }
    }

    public function getExtension( $fileName ) {
        $dotPos = strrpos( $fileName, '.' );
        if ( $dotPos === false ) {
            $this->error( "No file extension, cannot determine type: $fileName" );
            exit( 1 );
        }

        return substr( $fileName, $dotPos + 1 );
    }

    public function minify( $inPath, $outPath ) {
        $extension = $this->getExtension( $inPath );
        $this->output( basename( $inPath ) . ' -> ' . basename( $outPath ) . '...' );

        $inText = file_get_contents( $inPath );
        if ( $inText === false ) {
            $this->error( "Unable to open file $inPath for reading." );
            exit( 1 );
        }
        $outFile = fopen( $outPath, 'w' );
        if ( !$outFile ) {
            $this->error( "Unable to open file $outPath for writing." );
            exit( 1 );
        }

        switch ( $extension ) {
            case 'js':
                $outText = JavaScriptMinifier::minify( $inText );
                break;
            case 'css':
                $outText = CSSMin::minify( $inText );
                break;
            default:
                $this->error( "No minifier defined for extension \"$extension\"" );
        }

        fwrite( $outFile, $outText );
        fclose( $outFile );
        $this->output( " ok\n" );
    }
}

$maintClass = 'MinifyScript';
require_once RUN_MAINTENANCE_IF_MAIN;