README

Wrangle data from your terminal using extensible & expressive philo syntax

Requires PHP 7.4+

Install globally

If you're not using cgr for global installs, consider adopting it:

composer global require consolidation/cgr

Then install philo globally via cgr:

cgr --stability dev lmnt/philo-cli

Interactive mode

Use the repl to experiment:

> philo

Predicates & Types

Let's define a few types:

⏂ > $Age = all(is_int, gt(0), lt(150))
⏂ > $Person = ['name' => is_string, 'age' => $Age, 'website' => maybe(is_url)]
⏂ > $Contacts = every($Person)

We can make some assertions now:

⏂ > is($Person, ['name' => 'bob', 'age' => 50])
=> true
⏂ > is($Person, ['name' => 'bob', 'age' => 50, 'extra' => 1])
=> true
⏂ > is(strict($Person), ['name' => 'bob', 'age' => 50, 'extra' => 1])
=> false
⏂ > is($Person, ['name' => 'bob', 'age' => -1])
=> false
⏂ > is($Person, ['name' => 'bob', 'age' => 50, 'website' => 'google.com'])
=> false
⏂ > is($Person, ['name' => 'bob', 'age' => 50, 'website' => 'http://google.com'])
=> true
⏂ > is($Contacts, [['name' => 'bob', 'age' => 50]])
=> true
⏂ > is($Contacts, [['name' => 'bob', 'age' => 50], 'barb'])
=> false

On built-in types as well:

⏂ > $x = new \ArrayObject()
⏂ > is(\ArrayObject::class, $x)
=> true
⏂ > is(\Countable::class, $x)
=> true

Get back to your terminal via ctrl + c or by typing exit.

Loading data

Load data into philo from a local file or a URL.

Let's restart the repl with some json from a public endpoint:

> philo http://data.cdc.gov/data.json

Examine the datasource:

⏂ > $x

What are the keywords for the last 3 entries?

⏂ > pipe(to_array(pluck('keyword')), slice(-3))($x['dataset'])

Non-interactive mode

Pipe data in:

> echo '[{"a":1,"b":3},{"a":2,"b":4}]' | philo 'to_array(pluck(a), true)'
[{"a":1},{"a":2}]

Or send via input redirection:

> curl https://newton.now.sh/factor/x^2-1 > /tmp/math
> cat /tmp/math
{"operation":"factor","expression":"x^2-1","result":"(x - 1) (x + 1)"}
> philo 'pipe(to_array(values), spread(fn($a, $b, $c) => [$c, $b, $a]))' < /tmp/math
["(x - 1) (x + 1)","x^2-1","factor"]

Extending philo

Open ~/philo-lib.php in your editor and define a new type:

<?php
  
namespace philo;

const size = 'philo\size';

function size($x) {
    return is_string($x) ? strlen($x) : (is_countable($x) ? count($x) : null);
}

return [
    'Thing' => ['name' => pipe(size, gte(5))]
];

Save and you're done! Try it out:

> echo '[{"name": "abc"},{"name":"01234"}]' | \
> philo --lib ~/philo-lib.php 'to_array(map(match($Thing, "thing")))'
[null,"thing"]

lmnt / philo-cli

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