Save output to file in land2geo

bin/land2geo

@@ -1,6 +1,7 @@
 #!/usr/bin/env node
 
 const landxml = require('../bundles/landxml.node.dev');
+const fs = require('fs');
 
 const argv = require('yargs')
   .scriptName("land2geo")
@@ -25,13 +26,23 @@ const argv = require('yargs')
           describe: 'the source coordinates projection to use for the LandXML file',
           type: 'string'
         })
+        .option('o', {
+          alias: 'output',
+          describe: 'the path to the output file. default to stdout',
+          type: 'string'
+        })
       ;
     },
     handler: argv => {
       const converter = new landxml.Converter();
       converter.toGeoJSON(argv.file, { projection: argv.projection })
         .then(geojson => {
-          console.log(JSON.stringify(geojson, null, 2));
+          const data = JSON.stringify(geojson, null, 2);
+          if (argv.output) {
+            fs.writeFileSync(argv.output, data);
+          } else {
+            console.log(data);
+          }
         })
         .catch(err => {
           console.error(err);