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rennex
/ gist:1379171
Created
November 19, 2011 18:20
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| $ type rvm | head -n1 | |
| rvm is a function | |
| $ screen | |
| (now inside a fresh screen) | |
| $ type rvm | head -n1 | |
| rvm is /usr/local/rvm/bin/rvm |
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| require "sinatra" | |
| class Foo < Sinatra::Base | |
| end | |
| Foo.inline_templates=nil | |
| p Foo.templates[:thing] |
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| require "sinatra" | |
| get "/" do | |
| content_type "text/plain" | |
| txt = "" | |
| env.each {|k,v| txt += "\n%30s: %s" % [k,v]} | |
| txt | |
| end |
rennex
/ fractionator.rb
Created
June 25, 2013 00:56
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| # converts an arbitrary decimal number into a fraction | |
| # returns [input, result, check] where "check" is eval(result) with floats | |
| def frac(str); raise ArgumentError unless str =~ /\A(\d*)\.(\d+)\z/; x=($1+$2).to_i; y=10**($2.size); gcd=x.gcd(y); r="#{x/gcd}/#{y/gcd}"; return [str, r, eval(r+".0")]; end | |
| # testing it with some random examples: | |
| p frac("#{rand 100}.#{rand 10000}") | |
| # => ["39.3575", "15743/400", 39.3575] | |
| # => ["34.7117", "347117/10000", 34.7117] | |
| # => ["41.8720", "5234/125", 41.872] |
rennex
/ floatbits.rb
Last active
December 20, 2015 18:09
Get the bit representation of a double in Ruby. (pack it as "G" = big-endian double-precision float, unpack as "Q>" = big-endian 64-bit int)
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| def bits(x) "%064b" % ([x].pack("G").unpack("Q>")[0]) end | |
| bits(0.1) | |
| #=> "0011111110111001100110011001100110011001100110011001100110011010" | |
| bits(-0.1) | |
| #=> "1011111110111001100110011001100110011001100110011001100110011010" |
rennex
/ emailtemplate.rb
Created
August 11, 2013 03:44
Email template system for constructing plaintext emails (the example shows usage in a Sinatra route, with the mail gem)
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| class EmailTemplate | |
| def initialize | |
| @io = StringIO.new | |
| end | |
| def puts(*args) | |
| @io.puts *args | |
| end | |
| def print(*args) | |
| @io.print *args | |
| end |
rennex
/ simpletabs.html
Last active
December 25, 2015 13:39
HTML tabs using a simple piece of standalone JS and some CSS
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| <html> | |
| <head> | |
| <style type="text/css"> | |
| #tabnav { | |
| list-style-type: none; | |
| padding: 0; | |
| } | |
| #tabnav li { | |
| display: inline; | |
| padding: 0.5em; |
rennex
/ secure_compare.rb
Created
October 29, 2013 02:17
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| # constant-time comparison algorithm to prevent timing attacks | |
| # (borrowed from devise) | |
| def secure_compare(a, b) | |
| return false if a.bytesize != b.bytesize | |
| l = a.unpack "C#{a.bytesize}" | |
| res = 0 | |
| b.each_byte { |byte| res |= byte ^ l.shift } | |
| res == 0 | |
| end |
rennex
/ sinatra trailing slash.rb
Last active
December 29, 2015 01:39
If a request to my Sinatra app would return 404 just because of a trailing slash, redirect to the correct path.
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| not_found do | |
| # redirect GET and HEAD requests to "/foo/" to "/foo" | |
| if (request.get? || request.head?) && request.path_info[-1] == "/" | |
| newpath = request.path_info.chop | |
| if Sinatra::Application.routes["GET"].find {|re,*other| newpath =~ re } | |
| redirect to(newpath) | |
| end | |
| end | |
| haml :x404 | |
| end |
rennex
/ sinatra_once_on_startup.rb
Last active
August 29, 2015 14:02
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| require "sinatra" | |
| DATA = File.read("data.txt") | |
| get "/" do | |
| "I have some data for you: #{DATA}" | |
| end |
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