Textmate bundle command to create a variable declaration with the contents of the selection.

var-from-selection.tmCommand

#!/usr/bin/env ruby -wKU

# Save:   Nothing
# Input:  Document
# Output: Replace Input
# Caret Placement: Line Interpolation


COCOA_DIALOG_COMMAND = "#{ENV["TM_SUPPORT_PATH"]}/bin/CocoaDialog.app/Contents/MacOS/CocoaDialog"

def get_var_name
  options = 'standard-inputbox --float --title "Variable Name" --focus-textbox --editable --text foo --informative-text "Enter a name for the variable"'
  dialog_command = "\"#{COCOA_DIALOG_COMMAND}\" #{options}"
  results = `#{dialog_command}`.split
  results[0] == '1' && !results[1].nil? ? results[1].strip : nil
end

lines = STDIN.readlines()
result = lines  # no change by default

if ENV.member?("TM_SELECTED_TEXT")
  var_name = get_var_name
  if (var_name)
    # selection is in format line:col-line:col eg: 5:3-5:15
    # beware that the start of selection may be after the end of selection if the
    # selection was made from right to left (or bottom to top)
    l1, c1, l2, c2 = ENV["TM_SELECTION"].split('-').map {|x| x.split(':') }.flatten.map {|x| x.to_i - 1 }
    if l1 > l2
      l1, l2 = l2, l1
      c1, c2 = c2, c1
    elsif l1 == l2 && c1 > c2
      c1, c2 = c2, c1
    end
  
    # Get the indention of the line at the start of the selection.
    indent = lines[l1].match(/^\s*/).to_s
    var_prefix = "var #{var_name} = "
    indent2 = indent + (" " * var_prefix.length)
    selection = ENV["TM_SELECTED_TEXT"].strip.split("\n")
    var_value = selection.first + "\n" + selection.drop(1).map {|s| indent2 + s.lstrip + "\n"}.join
    var_decl = indent + var_prefix + var_value
    replaced_selection = lines[l1][0...c1] + var_name + lines[l2][c2..-1]
    
    result = lines[0...l1]
    result += [var_decl, replaced_selection]
    result += lines[l2+1..-1]
  end
end  

print result