Simple CLI json query tool

If you using CLI REST clients like Resty (https://github.com/micha/resty) sometimes you want to make queries to received json.

This simple ruby script will help you:

#!/usr/bin/env ruby
# Very simple and dirty json CLI query tool

require 'rubygems'
require 'json'

def numeric?(s)
  Float(s) rescue false
end

this = JSON[STDIN.read]
js_path = ARGV[0].split('.')

unless ARGV[0] == "-e"
  query_string = "#{js_path[0]}"
  query_string = query_string + js_path[1..-1].reduce("") do |s, p| 
    if numeric? p
      "#{s}[#{p}]" 
    else
      "#{s}['#{p}']" 
    end
  end
else
query_string = ARGV[1]
end

result = eval(query_string)
begin 
  puts JSON.pretty_generate(result)
rescue Exception => e
  puts result
end

Usage:

~ :λ GET /semka
{
  "id" : "137",
  "type" : "user",
  "name" : "Սեմյոն Նովիկով",
  "login" : "semka",
  "firstName" : "Սեմյոն",
  "lastName" : "Նովիկով",
  "picture" : "pic_d71fb6d4-e7c6-4beb-985b-c2f71d981987",
  "scores" : 27,
  "maxScores" : 49,
  "title" : "pedestrian",
  "followed" : false,
  "privateAccount" : true,
  "qTrainings" : 36,
  "qPhotos" : 110,
  "sex" : "M",
  "mealsPerDay" : 5
}
~ :λ GET /semka | json -e 'this["login"]'
semka
~ :λ GET /semka | json -e 'this["name"]'
Սեմյոն Նովիկով
~ :λ

Or even that way:

~ :λ GET /denbl          
{
  "id" : "120",
  "type" : "user",
  "name" : "Denis Blinov",
  "login" : "denbl",
  "firstName" : "Denis",
  "lastName" : "Blinov",
  "picture" : "pic_f105874c-0ad9-466c-8291-f91cba414aac",
  "scores" : 86,
  "maxScores" : 137,
  "dateOfBirth" : "1987-11-28",
  "title" : "cycler",
  "facebookName" : "denbl",
  "facebookUrl" : "http://www.facebook.com/denbl",
  "followed" : false,
  "privateAccount" : false,
  "qFollowed" : 198,
  "qFollowers" : 581,
  "qTrainings" : 185,
  "qPhotos" : 560,
  "sex" : "M",
  "twitterName" : "denbl",
  "twitterUrl" : "http://twitter.com/denbl",
  "qBadges" : 18,
  "board" : [ {
    "id" : "102953",
    "name" : "Ilya Pavlenkov",
    "login" : "sirjartur",
    "picture" : "pic_cf0e66c4-e01f-4595-bc88-a8a314cd2ae7",
    "scores" : 94,
    "position" : 6,
    "title" : "cycler",
    "followed" : false,
    "qTrainings" : 15,
    "qPhotos" : 1,
    "sex" : "M",
    "mealsPerDay" : 5
  }, {
    "id" : "3819",
    "name" : "Кирилл Чернаков",
    "login" : "kirys",
    "picture" : "pic_01740f92-5d1f-48ee-a628-fb2fa188df35",
    "scores" : 90,
    "position" : 7,
    "comment" : "",
    "title" : "cycler",
    "followed" : false,
    "qTrainings" : 79,
    "qPhotos" : 78,
    "sex" : "M",
    "mealsPerDay" : 5
  }, {
    "id" : "120",
    "name" : "Denis Blinov",
    "login" : "denbl",
    "picture" : "pic_f105874c-0ad9-466c-8291-f91cba414aac",
    "scores" : 86,
    "position" : 8,
    "title" : "cycler",
    "followed" : false,
    "qTrainings" : 185,
    "qPhotos" : 560,
    "sex" : "M",
    "mealsPerDay" : 5
  }, {
    "id" : "7887",
    "name" : "Alexe",
    "login" : "alexe",
    "picture" : "pic_45c6a357-9905-47fa-9504-2363975d1a1c",
    "scores" : 75,
    "position" : 9,
    "comment" : "",
    "title" : "cycler",
    "followed" : false,
    "qTrainings" : 66,
    "qPhotos" : 4,
    "sex" : "M",
    "mealsPerDay" : 5
  }, {
    "id" : "159575",
    "name" : "Igor Stepahin",
    "login" : "stepahin",
    "picture" : "pic_925b58b7-2c7e-4f8a-8edf-853af4eca331",
    "scores" : 70,
    "position" : 10,
    "title" : "cycler",
    "followed" : false,
    "qTrainings" : 41,
    "qPhotos" : 29,
    "sex" : "M",
    "mealsPerDay" : 5
  } ],
  "mealsPerDay" : 5
}
~ :λ GET /denbl | json -e 'this["board"]' 
[
  {
    "mealsPerDay": 5,
    "followed": false,
    "title": "cycler",
    "position": 6,
    "qPhotos": 1,
    "qTrainings": 15,
    "sex": "M",
    "picture": "pic_cf0e66c4-e01f-4595-bc88-a8a314cd2ae7",
    "name": "Ilya Pavlenkov",
    "scores": 94,
    "login": "sirjartur",
    "id": "102953"
  },
  {
    "mealsPerDay": 5,
    "followed": false,
    "title": "cycler",
    "position": 7,
    "qPhotos": 78,
    "qTrainings": 79,
    "sex": "M",
    "picture": "pic_01740f92-5d1f-48ee-a628-fb2fa188df35",
    "name": "Кирилл Чернаков",
    "scores": 90,
    "login": "kirys",
    "comment": "",
    "id": "3819"
  },
  {
    "mealsPerDay": 5,
    "followed": false,
    "title": "cycler",
    "position": 8,
    "qPhotos": 560,
    "qTrainings": 185,
    "sex": "M",
    "picture": "pic_f105874c-0ad9-466c-8291-f91cba414aac",
    "name": "Denis Blinov",
    "scores": 86,
    "login": "denbl",
    "id": "120"
  },
  {
    "mealsPerDay": 5,
    "followed": false,
    "title": "cycler",
    "position": 9,
    "qPhotos": 4,
    "qTrainings": 66,
    "sex": "M",
    "picture": "pic_45c6a357-9905-47fa-9504-2363975d1a1c",
    "name": "Alexe",
    "scores": 75,
    "login": "alexe",
    "comment": "",
    "id": "7887"
  },
  {
    "mealsPerDay": 5,
    "followed": false,
    "title": "cycler",
    "position": 10,
    "qPhotos": 29,
    "qTrainings": 41,
    "sex": "M",
    "picture": "pic_925b58b7-2c7e-4f8a-8edf-853af4eca331",
    "name": "Igor Stepahin",
    "scores": 70,
    "login": "stepahin",
    "id": "159575"
  }
]
~ :λ GET /denbl | json -e 'this["board"][0]'
{
  "sex": "M",
  "followed": false,
  "picture": "pic_cf0e66c4-e01f-4595-bc88-a8a314cd2ae7",
  "qTrainings": 15,
  "scores": 94,
  "qPhotos": 1,
  "title": "cycler",
  "mealsPerDay": 5,
  "name": "Ilya Pavlenkov",
  "login": "sirjartur",
  "position": 6,
  "id": "102953"
}