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DailyJS

The JavaScript blog.


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Vim.js

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Surely the very reason Emscripten was created?

Finally, my worlds have collided! In case you didn't know, I regularly write a Vim blog. It's surprisingly easy to find things to say about this 22 year old text editor, and it's been my main tool for writing code and articles for a long time. Vim.js (GitHub: coolwanglu / vim.js) by Lu Wang is an Emscripten port of Vim, allowing you to use Vim in a browser.

It runs pretty well on my computer -- it seems fast, and the commands I typically use work. It's not like these Vim layers for IDEs and other editors that miss certain motions, registers, and so on: it's basically Vim. Split windows and tabs work, but the help files aren't available (or I can't find them). The way it works in the browser is to use a <span> for each terminal character, which means for the 43x115 example window there are 4945 spans!

From a JavaScript point of view, I found the Sync to Async Transformation document interesting. The author is trying to figure out how to deal with JavaScript's asynchronous nature, given that Vim expects to have a non-busy synchronous sleep() function:

Most works are automatically done by web/transform.js, read the comments inside for more detail. But there are a few left, mainly function pointers, which cannot be automatically identified. Whenever vim.js crashes and you see callback function is not specified! in the browser console, congratulations, you have found one more async function at large.

I wonder if there are any Node developers or ES6 experts that can help with this? If you're interested in the project, there's a TODO which has some Emscripten issues and client-side work that needs doing.

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Node Roundup: 0.11.5, nvi, signobj

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Node 0.11.5

Node 0.11.5 was released this week. This unstable version updates v8 and uv. It also includes fixes for buffer, child_process, dgram, fs, https, openssl, os, tls, and util.

The patch for fs by Trevor Norris is interesting (pull request) -- rather than writing strings to a buffer and then the disk, it changes fs.js and src/node_file.cc to write directly to the disk instead.

nvi

nvi (GitHub: mikesmullin / nvi, License: GPLv3, npm: nvi) by Mike Smullin is a 'very opinionated Vi clone'. I tried installing it with npm install -g nvi, but it wouldn't run; I had to check out the repository manually. It doesn't clone Vi or Vim in a way that I think it's fair to call 'clone' -- I can't seem to get hjkl to move the cursor, and the modes have been changed to include 'COMBO' mode instead of Normal mode which makes using it extremely confusing for a seasoned Vim veteran.

Despite all that, and the fact that the name nvi is a bad choice, I find the project interesting because making complex text user interfaces isn't an easy task. Also, Mike's nvi is focused on collaborative features, which potentially makes Node a great fit.

signobj

Django has a cryptographic API for setting and reading signed cookies, and presumably you can also use this to sign API responses for RESTful JSON APIs. Inspired by this, signobj (GitHub: Submersible / node-signobj, License: MIT, npm: signobj by Ryan Munro allows you to sign JSON data with a SHA-1 HMAC:

signobj() - Signs data with secret, you can also pass in some extra hidden data that is used when hashing. This can be useful if you're creating an access token, and you want it to become invalid when they change their password, and also don't want the password with the public data.

Ryan said he's been using it to sign cookies and localStorage sessions.