sx is a command line utility which executes javascript code, mostly to process input and/or generate output.
Pull requests are very welcome!
$ npm install -g sx- Various input modes, including list and JSON input parsing.
- Standard and file I/O supported.
- Many automations: module auto-loading, last value auto-return, auto-escaping for zsh and auto-completion both for zsh and bash.
- Poor man's beautifier (JSON.stringify).
$ sx [options] "commands"--pretty, -p--json, -j--line, -x--list, -l--async, -a--filter, -f--string, -s--infile, -i [file]--outfile, -o [file]--file, -F [file]
### sx --pretty | -p
Pretty prints produced output, in case it's an object or an array.
Examples
$ sx -p "{hello:'world'}"
{
"hello": "world"
}### sx --json | -j
Accepts input as JSON, useful for chaining sx calls.
Examples
$ curl -sL http://freegeoip.net/json | sx -jx x.city
Berlin### sx --line | -x
Starts accepting input trough stdin, and exposes each line as x.
Examples
$ ps | sx -x 'x.match(/\d+/)[0]'
337
345
4118
79235
97048### sx --list | -l
Treats all input passed through stdin as an array of lines, and exposes it as l.
Examples
grep "console.log" * | sx -l l.length
5### sx --async | -a
Expects an asynchronous result, code must pass result to print callback exposed as a.
Examples
$ /dev/urandom | sx -a "process.stdin.on('data', a); process.stdin.resume()"
...### sx --filter | -f
Uses provided code as a predicate to test input.
Examples
$ ls | sx -fx "path.extname(x) === '.js'"
jayscript.js### sx --string | -s
Calls current object's toString method.
Examples
$ sx -s http.createServer
// vim: filetype=javascript
function (requestListener) {
return new Server(requestListener);
}### sx --infile [file] | -i [file]
Uses provided file as input instead of stdin.
Examples
$ sx -xlfi ~/.zshrc x.match\(/export PATH/\)
node_modules/.bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin### sx --outfile [file] | -o [file]
Uses provided file as output instead of stdout.
NOTE: Contents of output file will be wipped out preventively.
Examples
$ tail -f /var/log/system.log | sx -xo local.log "console.log(x); x"
...### sx --file [file] | -F [file]
Uses provided file as input instead of stdin and at the same time as output instead of stdout, could be used to mutate contents of files, writing to them after the contents are on memory.
NOTE: Contents of output file will be wipped out preventively.
Examples
$ sx -bF Makefile "b.replace(/win32/i, 'darwin')"### sx --json --line --list | -jxl
Accepts JSON input, treating it as a list and exposing each item.
Examples
$ sx '_.range(8)' | sx -jxlf x%2==0
0
2
4
6#### Express static server
$ npm install -g express
$ sx 'express.call().use(express.static("./")).listen(3000); "http://localhost:3000"'
http://localhost:3000$ npm install -g request
$ sx -a 'request.call(0, "http://google.com", function(err, resp, body){ a(body) })'
...### Auto-completion
Auto-completion is provided as a script for bash and zsh.
Test in current zsh:
$ source <(sx --completion)Install (bash):
$ echo "source <(sx --completion)" >> ~/.bashrcInstall (zsh):
$ echo "source <(sx --completion)" >> ~/.zshrcUsage (core):
$ sx fs.<tab>
$ sx h<tab>Usage (external module):
$ npm install -g lodash
$ sx _.<tab>### Auto-escaping
Auto-escaping is provided as a function for zsh.
Install:
- First you'll have to find what are your zsh function paths.
$ echo $fpath
/usr/share/zsh/site-functions /usr/share/zsh/5.0.2/functionsThen chose the first of them, and install the script (you may need root permissions):
$ sudo sx --escaping > /usr/share/zsh/site-functions/sx-escape-magicAnd add to your .zshrc an autoload command:
$ echo "autoload -Uz sx-escape-magic" >> ~/.zshrc
$ echo "sx-escape-magic" >> ~/.zshrcNow when you restart your shell you should be able to write javascript code and special characters will be automatically escaped.