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

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

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

skanev

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

World(WaitForAjaxToComplete)

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

command! CloseHiddenBuffers call s:CloseHiddenBuffers()
function! s:CloseHiddenBuffers()
  let open_buffers = []

  for i in range(tabpagenr('$'))
    call extend(open_buffers, tabpagebuflist(i + 1))
  endfor

  for num in range(1, bufnr("$") + 1)
    if buflisted(num) && index(open_buffers, num) == -1

AndrewRadev

command! CloseHiddenBuffers call s:CloseHiddenBuffers()
function! s:CloseHiddenBuffers()
  " Get the output of :ls as a string
  redir => ls_output
  silent ls
  redir END

  " Go through all buffer entries
  for line in split(ls_output, "\n")
    if line =~ '\d\+\s*\S\+\s*".*"' " then the listing contains flags

sjl

" folding for Markdown headers, both styles (atx- and setex-)
" http://daringfireball.net/projects/markdown/syntax#header
"
" this code can be placed in file
"   $HOME/.vim/after/ftplugin/markdown.vim

func! Foldexpr_markdown(lnum)
    let l1 = getline(a:lnum)

    if l1 =~ '^\s*$'

dimitarvp

# Alternative way of getting all Gem details using the official Rubygems REST API (thanks @qrush)

require 'open-uri'
require 'active_support/json'
require 'awesome_print'

ap ActiveSupport::JSON.decode(open("http://rubygems.org/api/v1/gems/#{ARGV[0]}.json"))

drnic

#!/usr/bin/env bash

"$@"