94 lines
2.5 KiB
JavaScript
94 lines
2.5 KiB
JavaScript
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'use strict';
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var _ = require('lodash'),
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temp = require('temp'),
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fs = require('fs'),
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exec = require('child_process').exec;
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// Automatically track and cleanup files at exit
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temp.track();
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exports.compare = function(req, res) {
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doCompare(req, res, false);
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};
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exports.compareMarkdown = function(req, res) {
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doCompare(req, res, true);
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};
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// Perform a comparison
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// The request should be a json object with two string fields: 'a' and 'b'
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function doCompare(req, res, isMarkdown) {
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//check for properly formatted request
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if (req.headers["content-type"].toLowerCase() != "application/json")
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return handleError(res, {error: "Content-type must be 'application/json'"});
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if (!req.body.a || !req.body.b)
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return handleError(res, {error: "Request data should be of the form {a:'text a', b:'text b'}"});
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var a = req.body.a;
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var b = req.body.b;
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//!!! this nested file-open is not a good pattern
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// better would be to use promises and write the two files asynchronously
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// open the first file
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temp.open('wdiffa-', function(err, filea) {
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//handle errors
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if (err)
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return handleError(res, err);
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//write the string to the file
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fs.write(filea.fd, a);
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//close the file
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fs.close(filea.fd, function(err) {
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if (err)
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return handleError(res, err);
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//open the second file
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temp.open('wdiffa-', function(err, fileb) {
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if (err)
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return handleError(res, err);
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//write the string to the file
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fs.write(fileb.fd, b);
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//close the file
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fs.close(fileb.fd, function(err) {
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if (err)
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return handleError(res, err);
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var cmd = "./bin/wdiff " + filea.path + " " +fileb.path;
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exec(cmd, function(err, stdout) {
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if (err && err.code!=1 && err.code!=0) {
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return handleError(res,err);
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}
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//if no difference was found by wdiff, err.code will be 0
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var wdiffSame;
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wdiffSame = (err && err.code == 0) ? true:false;
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//sub del and ins
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var markdown = stdout;
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markdown = markdown.replace(/\[-/g, '<del>');
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markdown = markdown.replace(/-\]/g, '</del>');
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markdown = markdown.replace(/{\+/g, '<ins>');
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markdown = markdown.replace(/\+}/g, '</ins>');
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var resData = {wdiff:stdout, same: wdiffSame, markdown: markdown};
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});
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});
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});
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});
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});
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}
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function handleError(res, err) {
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return res.send(500, err);
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} |