assemblyscript/tests/util/diff.js at master · python6460/assemblyscript · GitHub

30 lines (26 loc) · 837 Bytes

var JsDiff = require("diff");

var colors = require("../../cli/util/colors");

module.exports = function diff(filename, expected, actual) {

var diff = JsDiff.structuredPatch(filename, filename, expected, actual, "expected", "actual", { context: 5 });

if (!diff.hunks.length)

return null;

var ret = [];

ret.push('--- ' + diff.oldHeader);

ret.push('+++ ' + diff.newHeader);

for (var i = 0; i < diff.hunks.length; i++) {

var hunk = diff.hunks[i];

ret.push(

'@@ -' + hunk.oldStart + ',' + hunk.oldLines

+ ' +' + hunk.newStart + ',' + hunk.newLines

+ ' @@'

);

ret.push.apply(ret, hunk.lines.map(line =>

line.charAt(0) === "+"

? colors.green(line)

: line.charAt(0) === "-"

? line = colors.red(line)

: line

));

}

return ret.join('\n') + '\n';

};

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