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;;; eproject-tags.el --- visit project-specific tags table and keep it up to date
;; Copyright (C) 2011 Jonathan Rockway
;; Author: Jonathan Rockway <jon@jrock.us>
;; Keywords: convenience, programming, tags
;; 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 3 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, see <http://www.gnu.org/licenses/>.
;;; Commentary:
;;
;;; Code:
(eval-when-compile
(require 'cl))
(require 'eproject)
(require 'etags)
(defvar eproject-tags-etags "etags"
"The command you want to run to generate the tags file.
It must accept a list of relative filenames and send its output
to a file named TAGS.")
(defvar eproject-tags-verbose t
"Set to T if you want the verbose output of etags to stick around.
Only works with exuberant-ctags; this will cause standard etags to blow up in a giant ball of fire.")
(defvar eproject-tags-callback nil)
(defvar eproject-tags-state nil)
(make-variable-buffer-local 'eproject-tags-callback)
(make-variable-buffer-local 'eproject-tags-state)
(defun eproject-tags--buffer (root)
(let* ((name (concat (eproject-attribute :name root) "-TAGS"))
(buf (get-buffer-create (format "*%s*" name))))
buf))
(defun eproject-tags--debug-message (root format &rest rest)
(when eproject-tags-verbose
(with-current-buffer (eproject-tags--buffer root)
(goto-char (point-max))
(insert (apply #'format (concat "** " format) rest))
(insert "\n"))))
(defun eproject-tags--generate (cb &optional state root)
"Generate a tags table for this project (or the project in ROOT), calling CB with the project root and STATE upon completion.
All project-relevant files are considered and output goes to root/TAGS. The tags table is not visited after generation."
(let* ((root (or root (eproject-root)))
(default-directory root)
(files (eproject-list-project-files-relative root))
(name (concat (eproject-attribute :name root) "-TAGS"))
(buf (eproject-tags--buffer root))
(args (append '("-o" ".TAGS-tmp")))
(proc (apply #'start-process name buf eproject-tags-etags
(append args files))))
(with-current-buffer buf
(setq eproject-tags-callback cb)
(setq eproject-tags-state state)
(setq eproject-root root))
(set-process-sentinel proc #'eproject-tags--sentinel))
nil)
(defun eproject-tags--sentinel (process event)
(with-current-buffer (process-buffer process)
(let ((default-directory eproject-root))
(when (and eproject-tags-callback (equal event "finished\n"))
(rename-file ".TAGS-tmp" "TAGS" t)
(apply eproject-tags-callback eproject-tags-state)
(delete-process process)
(when (not eproject-tags-verbose)
(kill-buffer))))))
;;; TODO: un-visit this table when all project buffers go away?
;;; TODO: make the tags table "project-local"
(defun eproject-tags (&optional root)
"Update (or generate) and visit a tags table for the project in ROOT."
(interactive)
(let ((root (or root (eproject-root))))
(eproject-tags--generate
#'eproject-tags--visit-table (list root) root)))
(defun eproject-tags--visit-table (root &rest state)
"Callback called by eproject-tags after tags table has been created."
(let ((table (concat (file-name-as-directory root) "TAGS"))
(tags-revert-without-query t))
(add-to-list 'tags-table-list table t #'equal)
(tags-verify-table table)))
(defun eproject-tags--from-hook ()
(let ((root (ignore-errors (eproject-root)))
(file (ignore-errors (buffer-file-name))))
(when (and root file
(eproject-classify-file file root)
(not (eproject-attribute :suppress-tags root)))
(eproject-tags--debug-message
root "Regenerating tags table for %s because %s changed" root file)
(eproject-tags root))))
(add-hook 'eproject-first-buffer-hook #'eproject-tags--from-hook)
(add-hook 'eproject-project-change-hook #'eproject-tags--from-hook)
(provide 'eproject-tags)
;;; eproject-tags.el ends here
|
