stephanwehner

#!/usr/bin/ruby

# Instead of rails dbconsole. This loads a lot quicker, since it doesn't load all of rails.
        
# Place user/password in ~/.my.cnf as
# [client]                                                                                                                                     
# user=whathaveyou                                                                                                                                    
# password=whathaveyoupwd

require 'erb'                                                                                                                                

stephanwehner

# This is for Rails apps
# Place this in app/controllers/shutdown_controller.rb
#
# When you want to start up a new Rails server, but some other one is already running
# simply run this command: "curl http://localhost:3000/shutdown/exit" -- it will go away.
#
# This will work without any other changes if your routes include something like  
# match '/:controller(/:action(/:id))', via: [:all]
#
# Also, add app/controllers/shutdown_controller.rb to your global .gitignore file and noone will ever know!

stephanwehner

# Simple Key-Value store in Ruby
# Stephan Wehner, May 2017
#
# 2 sample sessions illustrate usage:
# In one terminal:
# $ ruby simple-key-value-store.rb
# In another terminal session:
#
# $ telnet localhost 3333
# Trying ::1...

stephanwehner

# See the Aug. 2014 paper Tackling the Minimal Superpermutation Problem by Robin Houston at http://arxiv.org/abs/1408.5108
# It announces a superpermutation for 6 symbols with length 872
# This Ruby script verifies it is a superpermutation and finds that all permutations only occur once.
# Kind of complements http://arxiv.org/src/1408.5108v1/anc/splitsuperperm.py ("Take a superpermutation, and print it as a sequence of permutations.")
# Invocation:
# ruby check_super_permutation_6.rb
# (Runs in 0.05 secs on a standard laptop, no optimizations necessary)

# Could also read this from http://arxiv.org/src/1408.5108v1/anc/superperm-6-866.txt
SUPER_PERMUTATION =<<END_PERM.gsub("\n",'')

stephanwehner

# JSON hashes of course allow multiple values for the same key.
# Only one is kept
# E.g.
# > h = JSON.parse '{"a":1, "a":2}'
# => {"a"=>2}
#
# If you don't like that, you can use this :

require 'json'
class DuplicateEntryCatchingHash < Hash

stephanwehner

#
# Suppose the file mainsurvey_sqldump.txt (available from colorsurvey.tar.gz, link at http://blog.xkcd.com/2010/05/03/color-survey-results/) has been loaded into file mainsurvey_sqldump.sqlite3, possibly with the command
#
# sqlite3 mainsurvey_sqldump.sqlite3 < mainsurvey_sqldump.txt
#
# Invocation of this Ruby script (UNIX command line)
#
# echo 'select r,g,b,colorname from answers;' | mainsurvey_sqldump.sqlite3  | ruby THIS-FILE > result.html

omit_colors = %w( grey gray yellow red green blue purple brown pink black  violet white orange cyan gray ).sort.uniq

stephanwehner

# Avoiding heredoc.chomp as in 
# assert_select "div#order p", <<-STR.chomp
# Test ABC
# Test DEF
# STR

def assert_select(a,b)
  puts "assert_select: #{a.inspect}, #{b.inspect}"
end

stephanwehner

# Add two numbers in Ruby.
# Strategy: make a list of known sums, and look up the one in question.

# What's the point? The point is: nowadays computing machinery is so powerful that 
# implementation in many cases doesn't matter. The most ridiculous approach can still be
# useful, and improving it, a waste of time.

# So here's a very silly way how to add numbers.

def add_by_grep(a,b)

stephanwehner

Searched Google for "if i wasn't on bittorrent relevant" (don't ask ...)

Got this at end of result listing:

"In response to a complaint we received under the US Digital Millennium Copyright Act, we have removed 1 result(s) from this page. If you wish, you may read the DMCA complaint that caused the removal(s) at ChillingEffects.org."

The chillingeffects.org page, http://www.chillingeffects.org/notice.cgi?sID=234923 says,

Quote: