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;;; google.el --- Emacs interface to the Google API
;; Copyright (C) 2002, 2008 Edward O'Connor <>
;; Author: Edward O'Connor <>
;; Keywords: comm, processes, tools
;; This file 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, or (at your option)
;; any later version.
;; This file is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; GNU General Public License for more details.
;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs; see the file COPYING. If not, write to
;; the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
;; Boston, MA 02111-1307, USA.
;;; Commentary:
;; You should always be able to find the latest version here:
;; <URL:>
;; A really bare-bones first hack at Google API support for Emacs.
;; Note that you need a Google license key to use this; you can
;; get one by following the instructions here:
;; <URL:>
;; Usage:
;; (require 'google)
;; (setq google-license-key "my license key" ; optional
;; google-referer "my url") ; required!
;; (google-search-video "rickroll")
;;; History:
;; 2002 or thereabouts: Initial version, which used the SOAP API.
;; 2008-04-24: Use the AJAX Search API instead of the SOAP API.
;; N.B., incompatible API changes galore!
;; 2008-05-01: Some convenience functions for parsing search result
;; blobs. Passes checkdoc now.
;;; Code:
(require 'json)
(require 'url)
(defvar url-http-end-of-headers)
(defgroup google nil
"Emacs interface to Google's AJAX Search API."
:group 'tools)
(defcustom google-license-key nil
"*Your Google license key.
This is optional. However, if you do specify it, it should correspond to
your `google-referer'."
:type '(string)
:group 'google)
(defcustom google-referer nil
"*The referer to send when performing Google searches.
Note that this is required by Google's terms of service."
:type '(string)
:group 'google)
(defun google-response (buf)
"Extract the JSON response from BUF."
(with-current-buffer buf
(setq case-fold-search nil)
(goto-char (point-min))
(when (re-search-forward "charset=utf-8" nil t)
(set-buffer-multibyte t)))
(goto-char url-http-end-of-headers)
(prog1 (json-read)
(kill-buffer buf))))
(defun google-search (terms &optional start search-domain)
"Search for TERMS.
START, if non-null, is the search result number to start at.
SEARCH-DOMAIN can be one of \"web\", \"local\", \"video\",
\"blogs\", \"news\", \"books\", or \"images\"."
(let ((url-package-name "google.el")
`(("Accept" . "application/json")
("Referer" . ,google-referer)))
(args `(("q" . ,terms)
("v" . "1.0"))))
(unless search-domain
(setq search-domain "web"))
(when google-license-key
(add-to-list 'args (cons "key" google-license-key)))
(when start
(add-to-list 'args (cons "start" start)))
(mapconcat (lambda (cons)
(format "%s=%s"
(url-hexify-string (car cons))
(url-hexify-string (cdr cons))))
(defmacro define-google-search-domain (domain)
"Define a google search function for DOMAIN, a keyword."
(setq domain (substring (symbol-name domain) 1))
(let ((func (intern (concat "google-search-" domain))))
`(defun ,func (terms &optional start)
,(format "Search %s with Google!
Results look like so:
\((responseStatus . N)
(moreResultsUrl . URL)
(currentPageIndex . N)
(estimatedResultCount . N)
(pages .
[((label . N)
(start . N))
(results .
[((content . STR)
(titleNoFormatting . STR)
(title . STR)
(cacheUrl . URL)
(visibleUrl . URL)
(url . URL)
(unescapedUrl . URL)
(GsearchResultClass . STR))
There are several utilities for extracting data from this structure; see
`google-result-field', `google-result-urls', and
(if (string= domain "web") "the web" domain))
(google-search terms start ,domain))))
(define-google-search-domain :web)
(define-google-search-domain :local)
(define-google-search-domain :video)
(define-google-search-domain :blogs)
(define-google-search-domain :news)
(define-google-search-domain :books)
(define-google-search-domain :images)
;;; Parsing google search results
(defsubst google-result-field (key json)
"Fetch KEY's value from JSON, a parsed JSON structure."
(cdr (assoc key json)))
(defun google-result-urls (results)
"Extract a list of search result URLs from RESULTS."
(let* ((responseData (google-result-field 'responseData results))
(records (google-result-field 'results responseData)))
(mapcar (lambda (record)
(google-result-field 'url record))
(defun google-result-more-results-url (results)
"Extract the URL for more search RESULTS."
(let* ((responseData (google-result-field 'responseData results))
(cursor (google-result-field 'cursor responseData)))
(google-result-field 'moreResultsUrl cursor)))
(provide 'google)
;;; google.el ends here