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diff --git a/addon-sdk/source/lib/diffpatcher/Readme.md b/addon-sdk/source/lib/diffpatcher/Readme.md new file mode 100644 index 000000000..1520b1c37 --- /dev/null +++ b/addon-sdk/source/lib/diffpatcher/Readme.md @@ -0,0 +1,70 @@ +# diffpatcher + +[](http://travis-ci.org/Gozala/diffpatcher) + +[](http://ci.testling.com/Gozala/diffpatcher) + +Diffpatcher is a small library that lets you treat hashes as if they were +git repositories. + +## diff + +Diff function that takes two hashes and returns delta hash. + +```js +var diff = require("diffpatcher/diff") + +diff({ a: { b: 1 }, c: { d: 2 } }, // hash#1 + { a: { e: 3 }, c: { d: 4 } }) // hash#2 + +// => { // delta +// a: { +// b: null, // - +// e: 3 // + +// }, +// c: { +// d: 4 // ± +// } +// } +``` + +As you can see from the example above `delta` makes no real distinction between +proprety upadate and property addition. Try to think of additions as an update +from `undefined` to whatever it's being updated to. + +## patch + +Patch fuction takes a `hash` and a `delta` and returns a new `hash` which is +just like orginial but with delta applied to it. Let's apply delta from the +previous example to the first hash from the same example + + +```js +var patch = require("diffpatcher/patch") + +patch({ a: { b: 1 }, c: { d: 2 } }, // hash#1 + { // delta + a: { + b: null, // - + e: 3 // + + }, + c: { + d: 4 // ± + } + }) + +// => { a: { e: 3 }, c: { d: 4 } } // hash#2 +``` + +That's about it really, just diffing hashes and applying thes diffs on them. + + +### rebase + +And as Linus mentioned everything in git can be expressed with `rebase`, that +also pretty much the case for `diffpatcher`. `rebase` takes `target` hash, +and rebases `parent` onto it with `diff` applied. + +## Install + + npm install diffpatcher |