lobar

A thin shell wrapper for lodash.chain().

install

> npm install -g lobar

usage

> lbr -h

Usage: lbr <JSON> <method> <arg> [method arg, ...] [options]

Options:
  -d, --data         <required> input json  [string]
  -f, --filename     <required> input json file  [string]
  -v, --verbose      verbosity level  [count]
  -p, --prettyPrint  pretty print output  [boolean]
  -i, --interactive  interactive mode  [boolean]
  -h, --help         Show help  [boolean]
  -V, --version      Show version number  [boolean]

Examples:
  lbr -d '["foo"]' map upperCase       ["FOO"]
  echo '{"foo": "bar"}' | lbr get foo  "bar"
  echo '{"foo": "bar"}' | lbr .foo     "bar"

pipe

$ echo '[{"foo":"bar"}, {"foo":"baz"}]' | lbr map foo
> ["bar","baz"]

You also have access to lodash methods inside of the method calls:

$ echo '[{"foo":"bar"}, {"foo": 3}]' | lbr filter 'x => isString(x.foo)'
> [{"foo":"bar"}]

shorthands

A leading . on an argument is shorthand for get:

$ echo '{"foo": {"bar": "baz"}}' | lbr .foo.bar
> "baz"

is equivalent to:

$ echo '{"foo": {"bar": "baz"}}' | lbr get foo.bar
> "baz"

interactive mode

$ curl https://registry.npmjs.com/lobar | lbr -i

vi keybindings

Interactive mode has basic vi keybindings. It starts in insert mode.

autocompletion

In insert mode, lobar will try to infer methods or argument from method/arg position and evaluated JSON at the current cursor position. <Tab>/<S-Tab> or <C-n>/<C-p> to navigate the completion list.

normal mode

Hitting esc will drop you into normal mode, where you can move horizontally with h, l, b, w, e, t, f, T, F, 0, and $. You can also use c and d with those movements in addition to i and a with a character or one of {}[]{}'". Vertical movement ('j', 'k', <C-d>, <C-u>), will scroll the json output.

u to undo and <C-r> to redo.

y will copy your current prompt input to your clipboard.

<C-c> to exit or enter to exit and print the currently evaluated json to stdout.

caveats

If you want to use a string argument for a method that collides with a lodash method name, you'll have to quote it twice:

echo '[{"isString": true}]' | lbr filter "'isString'"
[{"isString":true}]

This is because lbr tries to eval the argument with lodash as the context.

echo '[{"isString": true}]' | lbr filter isString
[]

environment variables

You can set options using environment variables:

$ LOBAR_PRETTY_PRINT=true lbr -d '{"foo": "bar"}' .foo
> "bar"

why?

I really like jq, but I have to look up the syntax all the time. As a javascript developer, I already know lodash, and it's generally enough for what I want to do at the command line.