dubdiff/server/api/comparison/comparison.controller.js

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'use strict';
var _ = require('lodash');
var Comparison = require('./comparison.model');
var wdiff = require('../../components/wdiff');
var jf = require('jsonfile');
var fs = require('fs');
//return the comparison given an id, if it exsits
exports.showComparison = function showComparison(req, res) {
//generate a filename
var filename = fnComparison(req.params.id);
//check if that file exists
fs.exists(filename, function (exists) {
//if the file does not exist, return a 404
if (!exists) return res.send(404);
//otherwise, read the file as JSON
jf.readFile(filename, function(err, comparison) {
if(err) { return handleError(res, err); }
//and return
return res.json(comparison);
});
});
}
//return a markdown wdiff for the comparison given an id, if it exsits
exports.wdiffMarkdownComparison = function wdiffMarkdownComparison(req, res) {
//generate a filename
var filename = fnComparison(req.params.id);
//check if that file exists
fs.exists(filename, function (exists) {
//if the file does not exist, return a 404
if (!exists) return res.send(404);
//otherwise, read the file as JSON
jf.readFile(filename, function(err, comparison) {
if(err) { return handleError(res, err); }
//now perform a wdiff on the result
wdiff(comparison.a,comparison.b, true, function(err, result) {
if (err)
return handleError(res, err);
_.merge(result, comparison)
return res.json(result);
});
});
});
}
// Creates a new comparison
exports.create = function create(req, res) {
var a = req.body.a;
var b = req.body.b;
//create the comparison
var comparison = new Comparison(a,b);
//look up its filename
var filename = fnComparison(comparison._id);
//and write it to the filesystem
jf.writeFile(filename, comparison, function(err) {
if(err) { return handleError(res, err); }
//if successful, return the comparison object
return res.json(201, comparison);
});
};
function handleError(res, err) {
console.log(err);
return res.send(500, err);
}
// returns a filename for the given comparison
function fnComparison (id) {
return "./data/" + "comp-" + id + ".json";
}