stackdot/sketch-preview

const fs             = require('fs')
const exec             = require('child_process').exec
const path             = require('path')

module.exports = function( ops ){

    const gulp         = ops.gulp;
    const config     = ops.config;
    
    const BIN = path.resolve( __dirname, '../../sketchtool/bin/sketchtool' )

    function getParams(){
        if( process.OPS.input ){
            return {
                exportDir:     path.resolve( process.OPS.outputPath, '../_artboards' ),
                jsonDir:     path.resolve( process.OPS.outputPath, './data.json' ),
                sketchFile: process.OPS.inputFile
            }
        }else{
            return {
                exportDir:     path.resolve( config.app, '../_artboards' ),
                jsonDir:     path.resolve( config.app, '../public/data.json' ),
                sketchFile: path.resolve( config.app, '../sketch/social-app-ui-kit.sketch' )
            }
        }
    }

    gulp.task( 'export-images', function( cb ){
        const { exportDir, jsonDir, sketchFile } = getParams()
        exec( `${BIN} export artboards --include-symbols --output=${exportDir} --scales=2.0 --use-id-for-name=YES --format=jpg ${sketchFile}`, cb )
    })

    gulp.task( 'generate-data', [ 'export-images' ], function( cb ){
        const { exportDir, jsonDir, sketchFile } = getParams()
        exec( `${BIN} list artboards ${sketchFile}`, ( err, out ) => {
            let json = JSON.parse( out )
            fs.writeFileSync( jsonDir, out )
            cb(err)
        })

    });

};