lisp/cedet/cedet-global.el

   1 ;;; cedet-global.el --- GNU Global support for CEDET.
   2
   3 ;; Copyright (C) 2008, 2009 Free Software Foundation, Inc.
   4
   5 ;; Author: Eric M. Ludlam <eric@siege-engine.com>
   6
   7 ;; This file is part of GNU Emacs.
   8
   9 ;; GNU Emacs is free software: you can redistribute it and/or modify
  10 ;; it under the terms of the GNU General Public License as published by
  11 ;; the Free Software Foundation, either version 3 of the License, or
  12 ;; (at your option) any later version.
  13
  14 ;; GNU Emacs is distributed in the hope that it will be useful,
  15 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  16 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17 ;; GNU General Public License for more details.
  18
  19 ;; You should have received a copy of the GNU General Public License
  20 ;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
  21
  22 ;;; Commentary:
  23 ;;
  24 ;; Basic support for calling GNU Global, and testing version numbers.
  25
  26 (declare-function inversion-check-version "inversion")
  27
  28 (defvar cedet-global-min-version "5.0"
  29   "Minimum version of GNU global required.")
  30
  31 (defcustom cedet-global-command "global"
  32   "Command name for the GNU Global executable."
  33   :type 'string
  34   :group 'cedet)
  35
  36 ;;; Code:
  37 (defun cedet-gnu-global-search (searchtext texttype type scope)
  38   "Perform a search with GNU Global, return the created buffer.
  39 SEARCHTEXT is text to find.
  40 TEXTTYPE is the type of text, such as 'regexp, 'string, 'tagname,
  41 'tagregexp, or 'tagcompletions.
  42 TYPE is the type of search, meaning that SEARCHTEXT is compared to
  43 filename, tagname (tags table), references (uses of a tag) , or
  44 symbol (uses of something not in the tag table.)
  45 SCOPE is the scope of the search, such as 'project or 'subdirs."
  46   (let ((flgs (cond ((eq type 'file)
  47                      "-a")
  48                     (t "-xa")))
  49         (scopeflgs (cond
  50                     ((eq scope 'project)
  51                      ""
  52                      )
  53                     ((eq scope 'target)
  54                      "l")))
  55         (stflag (cond ((or (eq texttype 'tagname)
  56                            (eq texttype 'tagregexp))
  57                        "")
  58                       ((eq texttype 'tagcompletions)
  59                        "c")
  60                       ((eq texttype 'regexp)
  61                        "g")
  62                       (t "r"))))
  63     (cedet-gnu-global-call (list (concat flgs scopeflgs stflag)
  64                                  searchtext))))
  65
  66 (defun cedet-gnu-global-call (flags)
  67   "Call GNU Global with the list of FLAGS."
  68   (let ((b (get-buffer-create "*CEDET Global*"))
  69         (cd default-directory))
  70     (with-current-buffer b
  71       (setq default-directory cd)
  72       (erase-buffer))
  73     (apply 'call-process cedet-global-command
  74            nil b nil
  75            flags)
  76     b))
  77
  78 (defun cedet-gnu-global-expand-filename (filename)
  79   "Expand the FILENAME with GNU Global.
  80 Return a fully qualified filename."
  81   (interactive "sFile: ")
  82   (let ((ans (with-current-buffer (cedet-gnu-global-call (list "-Pa" filename))
  83                (goto-char (point-min))
  84                (if (looking-at "global: ")
  85                    (error "GNU Global not available")
  86                  (split-string (buffer-string) "\n" t)))))
  87     (when (interactive-p)
  88       (if ans
  89           (if (= (length ans) 1)
  90               (message "%s" (car ans))
  91             (message "%s + %d others" (car ans)
  92                      (length (cdr ans))))
  93         (error "No file found")))
  94     ans))
  95
  96 (defun cedet-gnu-global-show-root ()
  97   "Show the root of a GNU Global area under the current buffer."
  98   (interactive)
  99   (message "%s" (cedet-gnu-global-root)))
 100
 101 (defun cedet-gnu-global-root (&optional dir)
 102   "Return the root of any GNU Global scanned project.
 103 If a default starting DIR is not specified, the current buffer's
 104 `default-directory' is used."
 105   (let ((default-directory (or dir default-directory)))
 106     (with-current-buffer (cedet-gnu-global-call (list "-pq"))
 107       (goto-char (point-min))
 108       (when (not (eobp))
 109         (file-name-as-directory
 110          (buffer-substring (point) (point-at-eol)))))))
 111
 112 (defun cedet-gnu-global-version-check (&optional noerror)
 113   "Check the version of the installed GNU Global command.
 114 If optional programatic argument NOERROR is non-nil, then
 115 instead of throwing an error if Global isn't available, then
 116 return nil."
 117   (interactive)
 118   (require 'inversion)
 119   (let ((b (condition-case nil
 120                (cedet-gnu-global-call (list "--version"))
 121              (error nil)))
 122         (rev nil))
 123     (if (not b)
 124         (progn
 125           (when (interactive-p)
 126             (message "GNU Global not found."))
 127           nil)
 128       (with-current-buffer b
 129         (goto-char (point-min))
 130         (re-search-forward "GNU GLOBAL \\([0-9.]+\\)" nil t)
 131         (setq rev (match-string 1))
 132         (if (inversion-check-version rev nil cedet-global-min-version)
 133             (if noerror
 134                 nil
 135               (error "Version of GNU Global is %s.  Need at least %s"
 136                      rev cedet-global-min-version))
 137           ;; Else, return TRUE, as in good enough.
 138           (when (interactive-p)
 139             (message "GNU Global %s  - Good enough for CEDET." rev))
 140           t)))))
 141
 142 (defun cedet-gnu-global-scan-hits (buffer)
 143   "Scan all the hits from the GNU Global output BUFFER."
 144   (let ((hits nil)
 145         (r1 "^\\([^ ]+\\) +\\([0-9]+\\) \\([^ ]+\\) "))
 146     (with-current-buffer buffer
 147       (goto-char (point-min))
 148       (while (re-search-forward r1 nil t)
 149         (setq hits (cons (cons (string-to-number (match-string 2))
 150                                (match-string 3))
 151                          hits)))
 152       ;; Return the results
 153       (nreverse hits))))
 154
 155 (provide 'cedet-global)
 156
 157 ;; arch-tag: 0d0d3ac2-91ef-4820-bb2b-1d59ccf38392
 158 ;;; cedet-global.el ends here