emacs: Improved printing support.

[notmuch] / emacs / notmuch-print.el

diff --git a/emacs/notmuch-print.el b/emacs/notmuch-print.el
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+++ b/emacs/notmuch-print.el
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+;; notmuch-print.el --- printing messages from notmuch.
+;;
+;; Copyright © David Edmondson
+;;
+;; This file is part of Notmuch.
+;;
+;; Notmuch 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.
+;;
+;; Notmuch 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 Notmuch.  If not, see <http://www.gnu.org/licenses/>.
+;;
+;; Authors: David Edmondson <dme@dme.org>
+
+(defcustom notmuch-print-mechanism 'notmuch-print-lpr
+  "How should printing be done?"
+  :group 'notmuch
+  :type '(choice
+         (function :tag "Use lpr" notmuch-print-lpr)
+         (function :tag "Use ps-print" notmuch-print-ps-print)
+         (function :tag "Use ps-print then evince" notmuch-print-ps-print/evince)
+         (function :tag "Use muttprint" notmuch-print-muttprint)
+         (function :tag "Use muttprint then evince" notmuch-print-muttprint/evince)
+         (function :tag "Using a custom function")))
+
+;; Utility functions:
+
+(defun notmuch-print-run-evince (file)
+  "View FILE using 'evince'."
+  (start-process "evince" nil "evince" file))
+
+(defun notmuch-print-run-muttprint (&optional output)
+  "Pass the contents of the current buffer to 'muttprint'.
+
+Optional OUTPUT allows passing a list of flags to muttprint."
+  (apply #'call-process-region (point-min) (point-max)
+        ;; Reads from stdin.
+        "muttprint"
+        nil nil nil
+        ;; Show the tags.
+        "--printed-headers" "Date_To_From_CC_Newsgroups_*Subject*_/Tags/"
+        output))
+
+;; User-visible functions:
+
+(defun notmuch-print-lpr (msg)
+  "Print a message buffer using lpr."
+  (lpr-buffer))
+
+(defun notmuch-print-ps-print (msg)
+  "Print a message buffer using the ps-print package."
+  (let ((subject (plist-get (notmuch-show-get-prop :headers msg) :Subject)))
+    (rename-buffer subject t)
+    (ps-print-buffer)))
+
+(defun notmuch-print-ps-print/evince (msg)
+  "Preview a message buffer using ps-print and evince."
+  (let ((ps-file (make-temp-file "notmuch"))
+       (subject (plist-get (notmuch-show-get-prop :headers msg) :Subject)))
+    (rename-buffer subject t)
+    (ps-print-buffer ps-file)
+    (notmuch-print-run-evince ps-file)))
+
+(defun notmuch-print-muttprint (msg)
+  "Print a message using muttprint."
+  (notmuch-print-run-muttprint))
+
+(defun notmuch-print-muttprint/evince (msg)
+  "Preview a message buffer using muttprint and evince."
+  (let ((ps-file (make-temp-file "notmuch")))
+    (notmuch-print-run-muttprint (list "--printer" (concat "TO_FILE:" ps-file)))
+    (notmuch-print-run-evince ps-file)))
+
+(defun notmuch-print-message (msg)
+  "Print a message using the user-selected mechanism."
+  (funcall notmuch-print-mechanism msg))
+
+(provide 'notmuch-print)