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View Char histogram
2. Given the file with random chars, draw a histogram of chars count.
For example for file with content
===
123456789012345678909999991234569999
===
Output should be the following:
1 ***
@retgoat
retgoat / 1-uses_tracker.ex
Created Dec 18, 2017 — forked from christhekeele/1-uses_tracker.ex
A way to know what modules a module has used in Elixir.
View 1-uses_tracker.ex
# For more elaborate use cases, see the IndirectUsesTracker instead:
# https://gist.github.com/christhekeele/fc4e058ee7d117016b9b041b83c6546a
###
# A way to know, at runtime, what modules a module has used at compile time.
# In this case, you include `UsesTracker` into a module. When that module gets
# used in some other module, it registers itself with the other module.
##
defmodule UsesTracker do
@retgoat
retgoat / 1-indirect_uses_tracker.ex
Created Dec 18, 2017 — forked from christhekeele/1-indirect_uses_tracker.ex
A way to track when modules are used in Elixir, and an example adapter/plugin architecture built on top.
View 1-indirect_uses_tracker.ex
# For simpler use cases, see the UsesTracker instead:
# https://gist.github.com/christhekeele/e858881d0ca2053295c6e10d8692e6ea
###
# A way to know, at runtime, what modules a module has used at compile time.
# In this case, you include `IndirectUsesTracker` into a module. When that module gets
# used in some other module, it makes that module registerable under a namespace of your choosing.
# When the registerable module is used into a third module, that third module will know at runtime which
# registerables were `use`d in it at compile time, via a function titled after the namespace.
View plain.ex
def get_specific_version(id, version, scope) do
datetime = Timex.parse!(version, "%FT%T.%fZ", :strftime)
|> Timex.shift(seconds: -1)
|> Timex.to_datetime
q = """
SELECT #{version_fields()} FROM #{table()}
WHERE id = $1::integer AND sys_period @> $2::timestamptz AND scope @> $3::ltree
UNION ALL
SELECT #{version_fields()} from #{history_table()}
WHERE id = $1::integer AND sys_period @> $2::timestamptz AND scope @> $3::ltree;
View gist:1af8a46d81614eb089e9718b84c5d86c

Pry Cheat Sheet

Command Line

  • pry -r ./config/app_init_file.rb - load your app into a pry session (look at the file loaded by config.ru)
  • pry -r ./config/environment.rb - load your rails into a pry session

Debugger

View ary_flatten.md

Flat an array without using Array#flatten method

Ruby

ary = [[1, 2, [3], []], 4]

Recursion

ary.flat_map{|element| element.kind_of?(Array) ? element.flat_map{|i| i} : element }
@retgoat
retgoat / time_travel_trigger.sql
Created May 29, 2017 — forked from myitcv/time_travel_trigger.sql
Trigger-based equivalent of old PostgreSQL time travel module - see http://blog.myitcv.org.uk/2014/02/25/row-level-version-control-with-postgresql.html for more details
View time_travel_trigger.sql
/*
Copyright (c) 2015 Paul Jolly <paul@myitcv.org.uk)
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
@retgoat
retgoat / gist:de7fa6601df61993002490fb72a25003
Created Nov 29, 2016 — forked from MrRuru/gist:5598385
Rails : skip all before filters
View gist:de7fa6601df61993002490fb72a25003
skip_filter *_process_action_callbacks.map(&:filter), :only => [:action_goes_here]
@retgoat
retgoat / examples
Last active Apr 27, 2016
OAuth with Koala
View examples
GET http://localhost:3000/fb/fb_code
RESPONSE
{"redirect_url":"https://www.facebook.com/dialog/oauth?client_id=893637180663238\u0026redirect_uri=http%3A%2F%2Flocalhost%3A3000%2Ffb%2Fcallback"}
----
redirect to https://www.facebook.com/dialog/oauth?client_id=893637180663238\u0026redirect_uri=http%3A%2F%2Flocalhost%3A3000%2Ffb%2Fcallback
redirect to callback_url
GET http://localhost:3000/fb/callback?code=FB_AUTH_CODE
RESPONSE
{"access_token":"FB_ACCESS_TOKEN"}
View active_support_logger.rb
# backported from rails 4 to use inside rails 3
# if you're using rails 4, you do not actually need this.
module ActiveSupport
class Logger < ::Logger
# extend ActiveSupport::TaggedLogging
# Broadcasts logs to multiple loggers. Returns a module to be
# `extended`'ed into other logger instances.
def self.broadcast(logger)
Module.new do
define_method(:add) do |*args, &block|
You can’t perform that action at this time.