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codesearch.el 1.0 --- Search for code via Google Code Search


From: Jürgen Hötzel
Subject: codesearch.el 1.0 --- Search for code via Google Code Search
Date: Thu, 28 Jun 2007 00:28:01 +0200
User-agent: Mutt/1.5.14 (2007-02-12)

;;; codesearch.el --- allowing users to search for open-source code on
;;; the Internet from within Emacs via Google Code Search

;; Copyright (C) 2007  Juergen Hoetzel

;; Author: Juergen Hoetzel <address@hidden>
;; Keywords: languages, tools, comm, docs
;; Version: 1.0

;; 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
;; 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 GNU Emacs; see the file COPYING.  If not, write to
;; the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
;; Boston, MA 02110-1301, USA.

;;; Commentary:

;; codesearch.el is tested with GNU Emacs 22.1 on GNU/Linux and
;; Windows

;; The latest version of this package should be available from
;; <URL:http://www.hoetzel.info/Hacking/emacs/codesearch.el>.

;; To use this mode, put codesearch.el somewhere on your load-path.
;; Then add this to your .emacs:
;;
;;    (require 'codesearch)
;; 

;;; Code:

(provide 'codesearch)

(defvar codesearch-history nil "Google Code Search history.")

(defvar codesearch-special-chars (string-to-list "$^\\\[\](){}*+")
  "Escape these character in querystring, because the have
  special meaning as regular expression")

(defvar codesearch-url-format-string 
  "http://www.google.com/codesearch?as_q=%s&as_lang=%s";
  "Format string for codesearch URL.")

(defun codesearch-mode-to-lang (mode)
  "map emacs mode to variable in Code Search querystring (list is
far from complete)."
  (cond ((or (eq mode 'lisp-mode)
             (eq mode 'emacs-lisp-mode)
             (eq mode 'scheme-mode)
             (eq mode 'lisp-interaction-mode)) 
         "lisp")
        ((eq mode 'ada-mode)
         "ada")
        ((eq mode 'c-mode)
         "c")
        ((eq mode 'c++-mode)
         "c++")
        ((eq mode 'fortran-mode)
         "fortran")
        ((eq mode 'java-mode)
         "java")
        ((eq mode 'lua-mode)
         "lua")
        ((eq mode 'objc-mode)
        "objectivec")
        ((eq mode 'pascal-mode)
         "pascal")
        ((eq mode 'perl-mode)
         "perl")
        ((eq mode 'php-mode)
         "php")
        ((eq mode 'prolog-mode)
         "prolog")
        ((eq mode 'python-mode)
         "python")
        ((eq mode 'scheme-mode)
         "scheme")
        ((or (eq mode 'sh-mode)
             (eq mode 'shell-mode))
         "shell")
        ((eq mode 'sql-mode)
         "sql")
        ((eq mode 'tcl-mode)
         "tcl")
        ((eq mode 'vhdl-mode)
         "vhdl")
        (t
         "")))

(defun codesearch-re-escape (re)
  "Looks for Code Search special characters and escape them, i.e. \\"
  (replace-regexp-in-string
   (regexp-opt-charset codesearch-special-chars) "\\\\\\&" re))

(defun codesearch(searchstring)
  "Code Search current word, or with optional prefix arg, on
current region"
  (interactive 
   (let* ((default-entry
            (codesearch-re-escape
             (if current-prefix-arg 
                 (buffer-substring (region-beginning) (region-end))
               (current-word))))
          (input 
           (read-string 
            "Code Search: " default-entry 'codesearch-history default-entry)))
     (if (string= input "")
         (error "No search string specified"))
     (list input)))
  
  ;; identification of lang
  (let* ((lang (codesearch-mode-to-lang major-mode))
         (url (format codesearch-url-format-string searchstring lang)))
    (require 'browse-url)
    (browse-url url)))

;;; codesearch.el ends here




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