bobinoscope-js/tools/tools-gphoto2.js

var BOB_mod_gm      = require('gm').subClass({ imageMagick: true });
var BOB_mod_gphoto2 = require('gphoto2');
var BOB_var_gphoto  = new BOB_mod_gphoto2.GPhoto2();
var BOB_mod_fs      = require('fs');
var BOB_mod_path    = require('path');
var BOB_mod_mkdirp  = require('mkdirp');

var BOB_cfg_config  = null;

var BOB_var_camera  = null;

var BOB_module = {};

BOB_upCameraReference(function() {});

function BOB_upCameraReference(pCallback) {
  // List cameras / assign list item to variable to use below options 
  if( BOB_var_camera === null ) {
    BOB_var_gphoto.list(function (list) {
      if (list.length === 0) {
        return pCallback();
      } else {
        BOB_var_camera = list[0];
        console.log(BOB_var_camera.model);
        return pCallback();
      }
    })
  } else {
    return pCallback();
  }
}

BOB_module.getConfig = function(pCallback) {
  BOB_var_camera.getConfig(pCallback);
}

BOB_module.takePicture = function(pBoothId, pPictId, pCallback) {
  var destPath = BOB_mod_path.join(BOB_cfg_config.paths.original, pBoothId);
  var pictPath = BOB_mod_path.join(destPath, BOB_cfg_config.pictNames[pPictId]);

  BOB_upCameraReference(function() {
    if( BOB_var_camera === null ) {
      return pCallback("No camera found");
    } else {
      BOB_var_camera.takePicture({download: true}, function (pErr, pData) {
        // If error occurs
        if( pErr ) {
          return pCallback(pErr)
        // Else write file on ddisk
        } else {
          BOB_mod_mkdirp(destPath, function() {
            BOB_mod_fs.writeFile(pictPath, pData, function(pErr) {
              BOB_mod_gm(pictPath)
                .autoOrient()
                .gravity('Center')
                .resize(BOB_cfg_config.cropSize.width, BOB_cfg_config.cropSize.height, "^")
                .crop(BOB_cfg_config.cropSize.width, BOB_cfg_config.cropSize.height)
                // .modulate(100, 0)
                // .contrast(+2)
                .write(dstPict, function(pErr) {
                  return pCallback(pErr, pictPath)
                })
            });
          })
        }
      });
    }
  })
}

module.exports = function(pConfig) {
  BOB_cfg_config = pConfig;
  return  BOB_module;
}