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index.js
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index.js
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// include some libraries
var _ = require('underscore'),
async = require('async');
// include some processing libraries
var tagReader = require('./includes/tag_reader.js'),
tagExtractor = require('./includes/tag_extractor.js'),
tagGenerator = require('./includes/tag_generator.js'),
tagWriter = require('./includes/tag_writer.js');
// initialise the tag retrieval
var read = function(file, callback) {
new tagReader(file, function(err, tag_buffer) {
if (err) {
return callback(err);
}
var tags = new tagExtractor(tag_buffer);
return callback(null, tags);
})
}
var write = function(params, callback) {
var actions = [];
actions.push(function(cb) {
new tagReader(params.path, function(err, tag_buffer) {
if (err) {
return cb(err);
}
params.original_size = tag_buffer.tags.length;
return cb(null, tag_buffer);
})
})
actions.push(function(tag_buffer, cb) {
var tags = new tagExtractor(tag_buffer);
// add in the new tags to our existing tags
for (var pt in params.tags) {
tags[pt] = params.tags[pt];
}
// swap the tags about
params.tags = tags;
return cb(null);
})
actions.push(function(cb) {
new tagGenerator(params, function(err, data) {
if (!_.isNull(err)) {
return cb(err);
}
params.tag_buffer = data;
return cb(null);
})
})
actions.push(function(cb) {
new tagWriter(params, function(err, data) {
if (!_.isNull(err)) {
return cb(err);
}
return cb(null, data);
})
})
async.waterfall(actions, function(err, data) {
if (!_.isNull(err)) {
return callback(err);
}
return callback(null, data);
})
}
module.exports = {
read: read,
write: write
}