avdi

require 'rubygems'
require 'mechanize'

MAX_PAGES = 6

def each_google_result_page(query, max_pages=MAX_PAGES)
  i = 0
  a = Mechanize.new do |a|
    a.get('http://google.com/') do |page|
      search_result = page.form_with(:name => 'f') do |search|

skanev

module WaitForAjaxToComplete
  def wait_for_ajax_to_complete
    wait_until { page.evaluate_script('$.active') == 0 }
  end
end

World(WaitForAjaxToComplete)

jcasimir

Transactions

As your business logic gets complex you may need to implement transactions. The classic example is a bank funds transfer from account A to account B. If the withdrawal from account A fails then the deposit to account B should either never take place or be rolled back.

Basics

All the complexity is handled by ActiveRecord::Transactions. Any model class or instance has a method named .transaction. When called and passed a block, that block will be executed inside a database transaction. If there's an exception raised, the transaction will automatically be rolled back.

Example

AndrewRadev

nnoremap << :call <SID>KeepCursorAfterShift('<<', -1)<cr>
nnoremap >> :call <SID>KeepCursorAfterShift('>>',  1)<cr>
function! s:KeepCursorAfterShift(cmd, modifier)
  let column = col('.')
  exe "normal! ".a:cmd
  call cursor(line('.'), column + a:modifier * &shiftwidth)
endfunction

kbaribeau

Ok, so I'm trying to replace a ' character with \' in a ruby string. I have working code, but it was 
*way* too painful getting there for my taste.

Take a look:

ree-1.8.7-2010.02 :001 > single_quote = "\'"
 => "'" 
ree-1.8.7-2010.02 :003 > single_quote.gsub(/'/, "\\\'")
 => "" 
ree-1.8.7-2010.02 :004 > single_quote.gsub(/'/) {|c| "\\'"}

AndrewRadev

autocmd! InsertLeave,WinEnter * call s:Highlight()
autocmd! InsertEnter *          call s:Unhighlight()

hi link HighlightSpace Search

function! s:Highlight()
  match HighlightSpace /\s\+$/
endfunction
function! s:Unhighlight()
  match none

skanev

If you have a select with option groups:

<select data-nested-select="Select country">
  <option>Select city</option>
  <optgroup label="Bulgaria">
    <option value="sofia">Sofia</option>
    <option value="plovdiv">Plovdiv</option>
  </optgroup>
  <optgroup label="Sweden">

Stockholm

AndrewRadev

MIT License

Copyright (c) 2017 Andrew Radev

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:

AndrewRadev

" Tabularize mappings
"
"   sa= -- align by equals
"   sa> -- align by "=>"
"
" and so on. Note that any character can be entered and the mappings will
" attempt to align by that, in the simplest way possible.
"
"   sa| -- equivalent to ":Tab/|"
"

mxcl

#!/bin/sh
# Just copy and paste the lines below (all at once, it won't work line by line!)
# MAKE SURE YOU ARE HAPPY WITH WHAT IT DOES FIRST! THERE IS NO WARRANTY!

function abort {
  echo "$1"
  exit 1
}

set -e