+1 for all your work. It's always good to have people thinking about new ways
of developing and improving code. Even if it's not widely adopted, it's good to
have different paths to choose :)
--
Diogo Resende
On Thursday, June 13, 2013 at 20:54 , Tim Caswell wrote:
> As some of you know, and many of you do not, I've been spending the last few
> months working on implementing git in javascript.
>
> I started out with a small, but successful [kickstarter] that enabled me to
> quit my day job and work full time on JS-Git. Since then I've worked with
> others like Chris Dickinson on the project. At this time, there is a node
> CLI tool in npm called "js-git-node" (I'll probably rename to just "js-git"
> or "js-git-cli") that supports full clone. I also have a chrome app that
> shows one way the code can run in a non-node'js environment with minimal
> changes.
>
> The goal of the project is to give git to all JavaScript environments as a
> set of modular packages. I will target chrome apps, websites, node client
> and servers, and anything else that makes sense.
>
> While working on this project, I've developed many new interfaces for things
> like streams and callbacks. I didn't want to port the node APIs directly to
> other platforms and instead took this opportunity to redesign from scratch
> what I would have done for node in hindsight.
>
> I'm now at the point where I'm very happy with the resulting API primitives.
>
> The new stream interface is called [min-stream] because is the minimal API
> surface for streams (data or objects) with backpressure and protocol filters.
> It's a lot simpler than node streams and can interop with node streams using
> the [min-stream-node] library.
>
> The stream interface is designed in such a way that creating a stream is
> nothing more than creating a function with a certain behavior and signature.
> Piping a stream source to a stream sink is just a normal function call.
> There is no need for an 82 line [pipe] function to connect min-streams.
>
> // The body of a TCP echo server in min-streams is simple
> socket.sink(socket.source);
>
> Another primitive that replaces callback-last-style in node is called
> [continuables]. It's much closer to node callbacks than promises (in fact
> all it takes to convert a node style function to a continuable is to use bind
> to partially apply the non-callback arguments).
>
> To convert setTimeout to continuable format is simply:
>
> function sleep(ms) {
> return function (callback) {
> setTimeout(callback, ms);
> };
> }
>
> Also of interest is integrating generators into continuables. The next
> v0.11.3 release of node should finally have full support for ES6 generators
> (behind a flag for now) and chrome dev channel already has it (also behind a
> flag). By using a tiny 40 line helper library, it's trivial to write sync
> style code that consumes native callback or continuable code with no build
> step as I've done in the [gen-run] library.
>
> Then using the sleep function above is as simple as:
>
> function* () {
> console.log("Waiting 1 second");
> yield sleep(1000);
> console.log("Done waiting")
> }
>
> I'm still working on js-git and am starting to make progress much faster now
> that I've decided what APIs I want to build from and implemented most the
> primitives. Any of these sub-projects can be used standalone and probably
> deserve their own announcement mail, but I'd rather not spam the list with
> every project I release. Follow me on twitter @creationix if you want that
> level of traffic.
>
> I do need your help. In order to finish [js-git] in a timely manner, I need
> to continue working on it full-time. If you find this project worthwhile
> and/or need it in your project, please show support by backing the fundraiser
> on [bountysource]. (or better, getting your employer to sponsor)
>
> There are so many awesome project ideas that have git in javascript as a
> dependency. I'm running out of money from the kickstarter (it's been months)
> and will have to stop working on js-git and get a new job if I don't get more
> funds soon.
>
> This is an experiment to see if a person can live off making 100% open source
> software that doesn't cater to any particular business.
>
> All software I've released in the open and is licensed MIT for anyone to use.
> I have open discussion on IRC (#js-git) and twitter and the jsgit google
> group every day looking for community feedback on the APIs.
>
> Let me know what you think.
>
> -Tim Caswell
>
> [bountysource]: https://www.bountysource.com/#fundraisers/325-js-git
> [js-git]: https://github.com/creationix/js-git
> [kickstarter]: http://www.kickstarter.com/projects/creationix/js-git
> [js-git-node]: https://github.com/creationix/js-git-node
> [min-stream]:
> https://github.com/creationix/js-git/blob/master/specs/min-stream.md
> [min-stream-node]: https://github.com/creationix/min-stream-node
> [continuable]:
> https://github.com/creationix/js-git/blob/master/specs/continuable.md
> [gen-run]: https://github.com/creationix/gen-run
>
> [pipe]: https://github.com/joyent/node/blob/master/lib/stream.js#L46-L127
>
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