function logDiff(log) {
var changes = diff(startDocs || firstDocs, endDocs || lastDocs);
log.info(options);
log.info(changes);
}
/**
* This function uses the objectdiff library to diff two objects or
* literals and generates a nice-looking diff (inspired by file diffs)
* from the result.
*
* @param a {*} diff operand 1, can be object or literal.
* @param b {*} diff operand 2, can be object or literal.
* @param colors {boolean} whether to colorize the output.
* @returns {Array} empty if equal, otherwise a list of changes.
* @private
*/
function _generateObjectDiff(a, b, colors) {
var result = [];
var numberPat = /^\d+$/;
// Format strings
var changeStr = ['* %s = %s -> %s',
'\x1B[36m* %s\x1B[0m = \x1B[31m%s\x1B[0m -> \x1B[32m%s\x1B[0m'];
var changeStr2 = ['* %s -> %s',
'\x1B[36m*\x1B[0m \x1B[31m%s\x1B[0m -> \x1B[32m%s\x1B[0m'];
var removeStr = ['- %s = %s',
'\x1B[31m- %s\x1B[0m = \x1B[31m%s\x1B[0m'];
var addStr = ['+ %s = %s',
'\x1B[32m+ %s\x1B[0m = \x1B[32m%s\x1B[0m'];
var idx = colors ? 1 : 0;
// Traverse the diff object to find all changes.
function traverse(node, path) {
var keys, i;
if (node.changed === 'object change') {
keys = Object.keys(node.value);
for (i = 0; i < keys.length; i++) {
var newPath;
// If the key is a number, it's probably an array index
if (numberPat.test(keys[i])) {
newPath = '[' + keys[i] + ']';
if (path) {
newPath = path + newPath;
}
} else {
newPath = path ? path + '.' + keys[i] : keys[i];
}
traverse(node.value[keys[i]], newPath);
}
} else if (node.changed === 'primitive change') {
result.push(_lineBreak(util.format(changeStr[idx]
, path
, util.inspect(node.removed)
, util.inspect(node.added))));
} else if (node.changed === 'removed') {
result.push(_lineBreak(util.format(removeStr[idx]
, path
, util.inspect(node.value))));
} else if (node.changed === 'added') {
result.push(_lineBreak(util.format(addStr[idx]
, path
, util.inspect(node.value))));
}
}
// objectdiff only supports comparing two objects.
if (a instanceof Object && b instanceof Object) {
var diff = objectDiff.diff(a, b);
traverse(diff, '');
} else {
if (a !== b) {
result.push(_lineBreak(util.format(changeStr2[idx]
, util.inspect(a)
, util.inspect(b))));
}
}
return result;
}