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+;;; nnmh.el --- mhspool access for Gnus
+;; Copyright (C) 1995,96,97 Free Software Foundation, Inc.
+
+;; Author: Lars Magne Ingebrigtsen <larsi@ifi.uio.no>
+;; 	Masanobu UMEDA <umerin@flab.flab.fujitsu.junet>
+;; Keywords: news, mail
+
+;; This file is part of GNU Emacs.
+
+;; GNU Emacs 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.
+
+;; GNU Emacs 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., 59 Temple Place - Suite 330,
+;; Boston, MA 02111-1307, USA.
+
+;;; Commentary:
+
+;; Based on nnspool.el by Masanobu UMEDA <umerin@flab.flab.fujitsu.junet>.
+;; For an overview of what the interface functions do, please see the
+;; Gnus sources.
+
+;;; Code:
+
+(require 'nnheader)
+(require 'nnmail)
+(require 'gnus-start)
+(require 'nnoo)
+(require 'cl)
+
+(nnoo-declare nnmh)
+
+(defvoo nnmh-directory message-directory
+  "*Mail spool directory.")
+
+(defvoo nnmh-get-new-mail t
+  "*If non-nil, nnmh will check the incoming mail file and split the mail.")
+
+(defvoo nnmh-prepare-save-mail-hook nil
+  "*Hook run narrowed to an article before saving.")
+
+(defvoo nnmh-be-safe nil
+  "*If non-nil, nnmh will check all articles to make sure whether they are new or not.")
+
+
+
+(defconst nnmh-version "nnmh 1.0"
+  "nnmh version.")
+
+(defvoo nnmh-current-directory nil
+  "Current news group directory.")
+
+(defvoo nnmh-status-string "")
+(defvoo nnmh-group-alist nil)
+
+
+
+;;; Interface functions.
+
+(nnoo-define-basics nnmh)
+
+(deffoo nnmh-retrieve-headers (articles &optional newsgroup server fetch-old)
+  (save-excursion
+    (set-buffer nntp-server-buffer)
+    (erase-buffer)
+    (let* ((file nil)
+	   (number (length articles))
+	   (large (and (numberp nnmail-large-newsgroup)
+		       (> number nnmail-large-newsgroup)))
+	   (count 0)
+	   beg article)
+      (nnmh-possibly-change-directory newsgroup server)
+      ;; We don't support fetching by Message-ID.
+      (if (stringp (car articles))
+	  'headers
+	(while articles
+	  (when (and (file-exists-p
+		      (setq file (concat (file-name-as-directory
+					  nnmh-current-directory)
+					 (int-to-string
+					  (setq article (pop articles))))))
+		     (not (file-directory-p file)))
+	    (insert (format "221 %d Article retrieved.\n" article))
+	    (setq beg (point))
+	    (nnheader-insert-head file)
+	    (goto-char beg)
+	    (if (search-forward "\n\n" nil t)
+		(forward-char -1)
+	      (goto-char (point-max))
+	      (insert "\n\n"))
+	    (insert ".\n")
+	    (delete-region (point) (point-max)))
+	  (setq count (1+ count))
+
+	  (and large
+	       (zerop (% count 20))
+	       (message "nnmh: Receiving headers... %d%%"
+			(/ (* count 100) number))))
+
+	(when large
+	  (message "nnmh: Receiving headers...done"))
+
+	(nnheader-fold-continuation-lines)
+	'headers))))
+
+(deffoo nnmh-open-server (server &optional defs)
+  (nnoo-change-server 'nnmh server defs)
+  (when (not (file-exists-p nnmh-directory))
+    (condition-case ()
+	(make-directory nnmh-directory t)
+      (error t)))
+  (cond
+   ((not (file-exists-p nnmh-directory))
+    (nnmh-close-server)
+    (nnheader-report 'nnmh "Couldn't create directory: %s" nnmh-directory))
+   ((not (file-directory-p (file-truename nnmh-directory)))
+    (nnmh-close-server)
+    (nnheader-report 'nnmh "Not a directory: %s" nnmh-directory))
+   (t
+    (nnheader-report 'nnmh "Opened server %s using directory %s"
+		     server nnmh-directory)
+    t)))
+
+(deffoo nnmh-request-article (id &optional newsgroup server buffer)
+  (nnmh-possibly-change-directory newsgroup server)
+  (let ((file (if (stringp id)
+		  nil
+		(concat nnmh-current-directory (int-to-string id))))
+	(nntp-server-buffer (or buffer nntp-server-buffer)))
+    (and (stringp file)
+	 (file-exists-p file)
+	 (not (file-directory-p file))
+	 (save-excursion (nnmail-find-file file))
+	 (string-to-int (file-name-nondirectory file)))))
+
+(deffoo nnmh-request-group (group &optional server dont-check)
+  (let ((pathname (nnmail-group-pathname group nnmh-directory))
+	dir)
+    (cond
+     ((not (file-directory-p pathname))
+      (nnheader-report
+       'nnmh "Can't select group (no such directory): %s" group))
+     (t
+      (setq nnmh-current-directory pathname)
+      (and nnmh-get-new-mail
+	   nnmh-be-safe
+	   (nnmh-update-gnus-unreads group))
+      (cond
+       (dont-check
+	(nnheader-report 'nnmh "Selected group %s" group)
+	t)
+       (t
+	;; Re-scan the directory if it's on a foreign system.
+	(nnheader-re-read-dir pathname)
+	(setq dir
+	      (sort
+	       (mapcar (lambda (name) (string-to-int name))
+		       (directory-files pathname nil "^[0-9]+$" t))
+	       '<))
+	  (cond
+	   (dir
+	    (nnheader-report 'nnmh "Selected group %s" group)
+	    (nnheader-insert
+	     "211 %d %d %d %s\n" (length dir) (car dir)
+	     (progn (while (cdr dir) (setq dir (cdr dir))) (car dir))
+	     group))
+	   (t
+	    (nnheader-report 'nnmh "Empty group %s" group)
+	    (nnheader-insert (format "211 0 1 0 %s\n" group))))))))))
+
+(deffoo nnmh-request-scan (&optional group server)
+  (nnmail-get-new-mail 'nnmh nil nnmh-directory group))
+
+(deffoo nnmh-request-list (&optional server dir)
+  (nnheader-insert "")
+  (let ((nnmh-toplev
+	 (or dir (file-truename (file-name-as-directory nnmh-directory)))))
+    (nnmh-request-list-1 nnmh-toplev))
+  (setq nnmh-group-alist (nnmail-get-active))
+  t)
+
+(defvar nnmh-toplev)
+(defun nnmh-request-list-1 (dir)
+  (setq dir (expand-file-name dir))
+  ;; Recurse down all directories.
+  (let ((dirs (and (file-readable-p dir)
+		   (> (nth 1 (file-attributes (file-chase-links dir))) 2)
+		   (directory-files dir t nil t)))
+	dir)
+    ;; Recurse down directories.
+    (while (setq dir (pop dirs))
+      (when (and (not (member (file-name-nondirectory dir) '("." "..")))
+		 (file-directory-p dir)
+		 (file-readable-p dir))
+	(nnmh-request-list-1 dir))))
+  ;; For each directory, generate an active file line.
+  (unless (string= (expand-file-name nnmh-toplev) dir)
+    (let ((files (mapcar
+		  (lambda (name) (string-to-int name))
+		  (directory-files dir nil "^[0-9]+$" t))))
+      (when files
+	(save-excursion
+	  (set-buffer nntp-server-buffer)
+	  (goto-char (point-max))
+	  (insert
+	   (format
+	    "%s %d %d y\n"
+	    (progn
+	      (string-match
+	       (regexp-quote
+		(file-truename (file-name-as-directory
+				(expand-file-name nnmh-toplev))))
+	       dir)
+	      (nnheader-replace-chars-in-string
+	       (substring dir (match-end 0)) ?/ ?.))
+	    (apply 'max files)
+	    (apply 'min files)))))))
+  t)
+
+(deffoo nnmh-request-newgroups (date &optional server)
+  (nnmh-request-list server))
+
+(deffoo nnmh-request-expire-articles (articles newsgroup
+					       &optional server force)
+  (nnmh-possibly-change-directory newsgroup server)
+  (let* ((active-articles
+	  (mapcar
+	   (function
+	    (lambda (name)
+	      (string-to-int name)))
+	   (directory-files nnmh-current-directory nil "^[0-9]+$" t)))
+	 (is-old t)
+	 article rest mod-time)
+    (nnmail-activate 'nnmh)
+
+    (while (and articles is-old)
+      (setq article (concat nnmh-current-directory
+			    (int-to-string (car articles))))
+      (when (setq mod-time (nth 5 (file-attributes article)))
+	(if (and (nnmh-deletable-article-p newsgroup (car articles))
+		 (setq is-old
+		       (nnmail-expired-article-p newsgroup mod-time force)))
+	    (progn
+	      (nnheader-message 5 "Deleting article %s in %s..."
+				article newsgroup)
+	      (condition-case ()
+		  (funcall nnmail-delete-file-function article)
+		(file-error
+		 (nnheader-message 1 "Couldn't delete article %s in %s"
+				   article newsgroup)
+		 (push (car articles) rest))))
+	  (push (car articles) rest)))
+      (setq articles (cdr articles)))
+    (message "")
+    (nconc rest articles)))
+
+(deffoo nnmh-close-group (group &optional server)
+  t)
+
+(deffoo nnmh-request-move-article
+  (article group server accept-form &optional last)
+  (let ((buf (get-buffer-create " *nnmh move*"))
+	result)
+    (and
+     (nnmh-deletable-article-p group article)
+     (nnmh-request-article article group server)
+     (save-excursion
+       (set-buffer buf)
+       (erase-buffer)
+       (insert-buffer-substring nntp-server-buffer)
+       (setq result (eval accept-form))
+       (kill-buffer (current-buffer))
+       result)
+     (progn
+       (nnmh-possibly-change-directory group server)
+       (condition-case ()
+	   (funcall nnmail-delete-file-function
+		    (concat nnmh-current-directory (int-to-string article)))
+	 (file-error nil))))
+    result))
+
+(deffoo nnmh-request-accept-article (group &optional server last noinsert)
+  (nnmh-possibly-change-directory group server)
+  (nnmail-check-syntax)
+  (when nnmail-cache-accepted-message-ids
+    (nnmail-cache-insert (nnmail-fetch-field "message-id")))
+  (prog1
+      (if (stringp group)
+	  (and
+	   (nnmail-activate 'nnmh)
+	   (car (nnmh-save-mail
+		 (list (cons group (nnmh-active-number group)))
+		 noinsert)))
+	(and
+	 (nnmail-activate 'nnmh)
+	 (let ((res (nnmail-article-group 'nnmh-active-number)))
+	   (if (and (null res)
+		    (yes-or-no-p "Moved to `junk' group; delete article? "))
+	       'junk
+	     (car (nnmh-save-mail res noinsert))))))
+    (when (and last nnmail-cache-accepted-message-ids)
+      (nnmail-cache-close))))
+
+(deffoo nnmh-request-replace-article (article group buffer)
+  (nnmh-possibly-change-directory group)
+  (save-excursion
+    (set-buffer buffer)
+    (nnmh-possibly-create-directory group)
+    (ignore-errors
+      (nnmail-write-region
+       (point-min) (point-max)
+       (concat nnmh-current-directory (int-to-string article))
+       nil (if (nnheader-be-verbose 5) nil 'nomesg))
+      t)))
+
+(deffoo nnmh-request-create-group (group &optional server args)
+  (nnmail-activate 'nnmh)
+  (unless (assoc group nnmh-group-alist)
+    (let (active)
+      (push (list group (setq active (cons 1 0)))
+	    nnmh-group-alist)
+      (nnmh-possibly-create-directory group)
+      (nnmh-possibly-change-directory group server)
+      (let ((articles (mapcar
+		       (lambda (file)
+			 (string-to-int file))
+		       (directory-files
+			nnmh-current-directory nil "^[0-9]+$"))))
+	(when articles
+	  (setcar active (apply 'min articles))
+	  (setcdr active (apply 'max articles))))))
+  t)
+
+(deffoo nnmh-request-delete-group (group &optional force server)
+  (nnmh-possibly-change-directory group server)
+  ;; Delete all articles in GROUP.
+  (if (not force)
+      ()				; Don't delete the articles.
+    (let ((articles (directory-files nnmh-current-directory t "^[0-9]+$")))
+      (while articles
+	(when (file-writable-p (car articles))
+	  (nnheader-message 5 "Deleting article %s in %s..."
+			    (car articles) group)
+	  (funcall nnmail-delete-file-function (car articles)))
+	(setq articles (cdr articles))))
+    ;; Try to delete the directory itself.
+    (ignore-errors
+      (delete-directory nnmh-current-directory)))
+  ;; Remove the group from all structures.
+  (setq nnmh-group-alist
+	(delq (assoc group nnmh-group-alist) nnmh-group-alist)
+	nnmh-current-directory nil)
+  t)
+
+(deffoo nnmh-request-rename-group (group new-name &optional server)
+  (nnmh-possibly-change-directory group server)
+  (let ((new-dir (nnmail-group-pathname new-name nnmh-directory))
+	(old-dir (nnmail-group-pathname group nnmh-directory)))
+    (when (ignore-errors
+	    (make-directory new-dir t)
+	    t)
+      ;; We move the articles file by file instead of renaming
+      ;; the directory -- there may be subgroups in this group.
+      ;; One might be more clever, I guess.
+      (let ((files (nnheader-article-to-file-alist old-dir)))
+	(while files
+	  (rename-file
+	   (concat old-dir (cdar files))
+	   (concat new-dir (cdar files)))
+	  (pop files)))
+      (when (<= (length (directory-files old-dir)) 2)
+	(ignore-errors
+	  (delete-directory old-dir)))
+      ;; That went ok, so we change the internal structures.
+      (let ((entry (assoc group nnmh-group-alist)))
+	(when entry
+	  (setcar entry new-name))
+	(setq nnmh-current-directory nil)
+	t))))
+
+(nnoo-define-skeleton nnmh)
+
+
+;;; Internal functions.
+
+(defun nnmh-possibly-change-directory (newsgroup &optional server)
+  (when (and server
+	     (not (nnmh-server-opened server)))
+    (nnmh-open-server server))
+  (when newsgroup
+    (let ((pathname (nnmail-group-pathname newsgroup nnmh-directory)))
+      (if (file-directory-p pathname)
+	  (setq nnmh-current-directory pathname)
+	(error "No such newsgroup: %s" newsgroup)))))
+
+(defun nnmh-possibly-create-directory (group)
+  (let (dir dirs)
+    (setq dir (nnmail-group-pathname group nnmh-directory))
+    (while (not (file-directory-p dir))
+      (push dir dirs)
+      (setq dir (file-name-directory (directory-file-name dir))))
+    (while dirs
+      (when (make-directory (directory-file-name (car dirs)))
+	(error "Could not create directory %s" (car dirs)))
+      (nnheader-message 5 "Creating mail directory %s" (car dirs))
+      (setq dirs (cdr dirs)))))
+
+(defun nnmh-save-mail (group-art &optional noinsert)
+  "Called narrowed to an article."
+  (unless noinsert
+    (nnmail-insert-lines)
+    (nnmail-insert-xref group-art))
+  (run-hooks 'nnmail-prepare-save-mail-hook)
+  (run-hooks 'nnmh-prepare-save-mail-hook)
+  (goto-char (point-min))
+  (while (looking-at "From ")
+    (replace-match "X-From-Line: ")
+    (forward-line 1))
+  ;; We save the article in all the newsgroups it belongs in.
+  (let ((ga group-art)
+	first)
+    (while ga
+      (nnmh-possibly-create-directory (caar ga))
+      (let ((file (concat (nnmail-group-pathname
+			   (caar ga) nnmh-directory)
+			  (int-to-string (cdar ga)))))
+	(if first
+	    ;; It was already saved, so we just make a hard link.
+	    (funcall nnmail-crosspost-link-function first file t)
+	  ;; Save the article.
+	  (nnmail-write-region (point-min) (point-max) file nil nil)
+	  (setq first file)))
+      (setq ga (cdr ga))))
+  group-art)
+
+(defun nnmh-active-number (group)
+  "Compute the next article number in GROUP."
+  (let ((active (cadr (assoc group nnmh-group-alist)))
+	(dir (nnmail-group-pathname group nnmh-directory)))
+    (unless active
+      ;; The group wasn't known to nnmh, so we just create an active
+      ;; entry for it.
+      (setq active (cons 1 0))
+      (push (list group active) nnmh-group-alist)
+      (unless (file-exists-p dir)
+	(make-directory dir))
+      ;; Find the highest number in the group.
+      (let ((files (sort
+		    (mapcar
+		     (lambda (f)
+		       (string-to-int f))
+		     (directory-files dir nil "^[0-9]+$"))
+		    '>)))
+	(when files
+	  (setcdr active (car files)))))
+    (setcdr active (1+ (cdr active)))
+    (while (file-exists-p
+	    (concat (nnmail-group-pathname group nnmh-directory)
+		    (int-to-string (cdr active))))
+      (setcdr active (1+ (cdr active))))
+    (cdr active)))
+
+(defun nnmh-update-gnus-unreads (group)
+  ;; Go through the .nnmh-articles file and compare with the actual
+  ;; articles in this folder.  The articles that are "new" will be
+  ;; marked as unread by Gnus.
+  (let* ((dir nnmh-current-directory)
+	 (files (sort (mapcar (function (lambda (name) (string-to-int name)))
+			      (directory-files nnmh-current-directory
+					       nil "^[0-9]+$" t))
+		      '<))
+	 (nnmh-file (concat dir ".nnmh-articles"))
+	 new articles)
+    ;; Load the .nnmh-articles file.
+    (when (file-exists-p nnmh-file)
+      (setq articles
+	    (let (nnmh-newsgroup-articles)
+	      (ignore-errors (load nnmh-file nil t t))
+	      nnmh-newsgroup-articles)))
+    ;; Add all new articles to the `new' list.
+    (let ((art files))
+      (while art
+	(unless (assq (car art) articles)
+	  (push (car art) new))
+	(setq art (cdr art))))
+    ;; Remove all deleted articles.
+    (let ((art articles))
+      (while art
+	(unless (memq (caar art) files)
+	  (setq articles (delq (car art) articles)))
+	(setq art (cdr art))))
+    ;; Check whether the articles really are the ones that Gnus thinks
+    ;; they are by looking at the time-stamps.
+    (let ((arts articles)
+	  art)
+      (while (setq art (pop arts))
+	(when (not (equal
+		    (nth 5 (file-attributes
+			    (concat dir (int-to-string (car art)))))
+		    (cdr art)))
+	  (setq articles (delq art articles))
+	  (push (car art) new))))
+    ;; Go through all the new articles and add them, and their
+    ;; time-stamps, to the list.
+    (setq articles
+	  (nconc articles
+		 (mapcar
+		  (lambda (art)
+		    (cons art
+			  (nth 5 (file-attributes
+				  (concat dir (int-to-string art))))))
+		  new)))
+    ;; Make Gnus mark all new articles as unread.
+    (when new
+      (gnus-make-articles-unread
+       (gnus-group-prefixed-name group (list 'nnmh ""))
+       (setq new (sort new '<))))
+    ;; Sort the article list with highest numbers first.
+    (setq articles (sort articles (lambda (art1 art2)
+				    (> (car art1) (car art2)))))
+    ;; Finally write this list back to the .nnmh-articles file.
+    (nnheader-temp-write nnmh-file
+      (insert ";; Gnus article active file for " group "\n\n")
+      (insert "(setq nnmh-newsgroup-articles '")
+      (gnus-prin1 articles)
+      (insert ")\n"))))
+
+(defun nnmh-deletable-article-p (group article)
+  "Say whether ARTICLE in GROUP can be deleted."
+  (let ((path (concat nnmh-current-directory (int-to-string article))))
+    ;; Writable.
+    (and (file-writable-p path)
+	 ;; We can never delete the last article in the group.
+	 (not (eq (cdr (nth 1 (assoc group nnmh-group-alist)))
+		  article)))))
+
+(provide 'nnmh)
+
+;;; nnmh.el ends here