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var spawn = require('child_process').spawn;
module.exports = function compare(actual, expected, diff, t, callback) {
var compare = spawn('compare', ['-metric', 'MAE', actual, expected, diff]);
var error = '';
compare.stderr.on('data', function(data) {
error += data.toString();
});
compare.on('error', function(err) {
t.error(err);
});
compare.on('exit', function(code) {
// The compare program returns 2 on error otherwise 0 if the images are similar or 1 if they are dissimilar.
if (code === 2) {
callback(error.trim(), Infinity);
} else {
var match = error.match(/^\d+(?:\.\d+)?\s+\(([^\)]+)\)\s*$/);
var difference = match ? parseFloat(match[1]) : Infinity;
callback(match ? '' : error, difference);
}
});
compare.stdin.end();
};
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