--    This program is free software; you can redistribute it and/or modify
--    it under the terms of the GNU General Public License as published by
--    the Free Software Foundation; either version 2 of the License, or
--    (at your option) any later version.

--    This program is distributed in the hope that it will be useful,
--    but WITHOUT ANY WARRANTY; without even the implied warranty of
--    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
--    GNU General Public License for more details.

--    You should have received a copy of the GNU General Public License
--    along with this program; if not, write to the Free Software
--    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

-- Copyright Olivier Croquette 2007 ocroquette at free dot fr

on keywordToURL(theKeyword, theParameters)
  set p to theParameters as text
  if theKeyword is equal to "gg" then
    return "http://www.google.com/search?q=" & p
  else if theKeyword is equal to "yt" then
    return "http://youtube.com/results?search=Search&search_query=" & p
  else if theKeyword is equal to "img" then
    return "http://images.google.com/images?btnG=Recherche+d%27images=2=" & p
  end if
  return ""
end keywordToURL

on openTab(theURL)
  tell application "Safari"
    -- Open a new window if none available
    if (count of every window) is equal to 0 then
      make new document
    end if
    
    set isUrlEmpty to true
    try
      if URL of document 1 is not equal to "" then
        set isUrlEmpty to false
      end if
    end try
    
    if not isUrlEmpty then
      tell window 1
        -- Open a new tab in the existing window
        set theTab to make new tab
        set current tab to theTab
      end tell
    else
      set theTab to current tab of window 1
    end if
    set URL of theTab to theURL
  end tell
end openTab

on run
  set AppleScript's text item delimiters to " "
  set theURL to ""
  set theQuery to "gg " -- set your default keyword here
  set theErrorText to ""
  set theDialogText to "Enter your query:"
  set theDialogText to "Enter your query:"
  repeat while theURL is equal to ""
    tell application "Safari"
      activate
      set theQuery to text returned of (display dialog theErrorText & theDialogText default answer theQuery)
      set theErrorText to "Bad keyword. Try again.
"
    end tell
    set theQueryList to text items of theQuery
    try
      set theKeyword to item 1 of theQueryList
      set theParameters to (items 2 thru -1 of theQueryList)
      set theParametersString to theParameters as text
      set theURL to my keywordToURL(theKeyword, theParameters)
    end try
  end repeat
  openTab(theURL)
end run