Add json-path-following feature

Make pjr releaseable as a gem

History.txt

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+=== 1.0 / ??
+
+* Major Enhancement
+  * Birthday!
+

Manifest.txt

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+History.txt
+Manifest.txt
+README.txt
+Rakefile
+bin/pjr

README.txt

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+= pjr (print_json_response)
+
+* http://github.com/jdunphy/print_json_response
+
+== DESCRIPTION
+
+A simple script to grab JSON from a URI and view it in a readable manner.
+
+== SYNOPSIS:
+
+  $ pjr "http://someplace.com/someurl.json"
+  Retrieving http://someplace.com/someurl.json:
+  {
+    "what":"oh hey look some pretty-printed json"
+  }
+
+You can also drop the hostname nonsense when hitting localhost
+
+  $ pjr "/someurl.json"
+  Retrieving http://127.0.0.1:3000/someurl.json:
+  {
+    "what":"oh hey look some pretty-printed json"
+  }
+
+Override the base default host of localhost:3000 with a .pjr file.
+
+  $ cat /Users/jdunphy/.pjr 
+  default_host:http://localhost:7000
+
+pjr can jump into irb, instead of printing json
+
+  $ pjr -i someurl.json
+  Retrieving http://127.0.0.1:3000/someurl.json:
+  Loading IRB.
+  JSON response is in @response
+  irb(main):001:0> @response['what']
+  => "oh hey look some pretty-printed json"
+
+== INSTALL:
+
+* gem install print_json_response
+

Rakefile

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+# -*- ruby -*-
+
+require 'rubygems'
+require 'hoe'
+
+Hoe.plugin :git
+
+Hoe.spec 'print_json_response' do
+  developer 'Jacob Dunphy', ''
+end
+
+# vim: syntax=Ruby

bin/pjr

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+#!/usr/bin/env ruby
+
+require 'print_json_response'
+
+PrintJsonResponse.run
+

lib/print_json_response.rb

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+require 'net/http'
+require 'optparse'
+require 'uri'
+
+require 'json'
+
+class PrintJsonResponse
+
+  VERSION = '1.0'
+
+  DEFAULT_HOST = 'http://127.0.0.1:3000'
+
+  CONFIG_PATH = File.expand_path '~/.pjr'
+
+  def self.process_args argv
+    options = {}
+
+    op = OptionParser.new do |opts|
+      opts.program_name = 'pjr'
+      opts.version = VERSION
+      opts.banner = <<-BANNER
+Usage: pjr [options] URL [PATH ...]
+
+PATH is a path of keys in the JSON document you wish to descend.  Given a JSON
+document like:
+
+  { "a": { "b": ["c", "d"] } }
+
+`pjr http://example/json a b` will print ["c", "d"]
+
+      BANNER
+
+      opts.on '--[no-]irb', 'Dump the results into @response in IRB' do |value|
+        options[:irb] = value
+      end
+    end
+
+    op.parse! argv
+
+    abort op.to_s if argv.empty?
+
+    url = argv.shift
+
+    options[:path] = argv
+
+    return url, options
+  end
+
+  def self.run argv = ARGV
+    url, options = process_args argv
+
+    pjr = new url, options
+
+    pjr.run
+  end
+
+  def initialize url, options
+    unless url =~ /\Ahttp/i then
+      url = '/' + url unless url.start_with? '/'
+      url = default_host + url
+    end
+
+    @url = URI.parse url
+
+    @irb  = options[:irb]
+    @path = options[:path]
+  end
+
+  def default_host
+    if File.exist? CONFIG_PATH and
+       File.read(CONFIG_PATH) =~ /default_host:(.+)/i then
+      $1.strip
+    else
+      DEFAULT_HOST
+    end
+  end
+
+  def run
+    $stderr.puts "Retrieving #{@url}:" if $stdout.tty?
+
+    resp = Net::HTTP.get_response @url
+    json = JSON.parse resp.body
+
+    json = @path.inject json do |data, item| data[item] end
+
+    if @irb then
+      require 'irb'
+      @response = json
+      puts "Loading IRB."
+      puts "JSON response is in @response"
+      IRB.start
+    else
+      require 'pp'
+      puts json.pretty_inspect
+    end
+  end
+
+end
+