334 lines
11 KiB
EmacsLisp
334 lines
11 KiB
EmacsLisp
;;; gnus-fun.el --- various frivolous extension functions to Gnus -*- lexical-binding: t; -*-
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;; Copyright (C) 2002-2024 Free Software Foundation, Inc.
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;; Author: Lars Magne Ingebrigtsen <larsi@gnus.org>
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;; Keywords: news
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;; This file is part of GNU Emacs.
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;; GNU Emacs is free software: you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation, either version 3 of the License, or
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;; (at your option) any later version.
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;; GNU Emacs is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with GNU Emacs. If not, see <https://www.gnu.org/licenses/>.
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;;; Commentary:
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;;; Code:
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(require 'mm-util)
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(require 'gnus-util)
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(require 'gnus)
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(defvar gnus-face-properties-alist)
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(defcustom gnus-x-face-directory (expand-file-name "x-faces" gnus-directory)
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"Directory where X-Face PBM files are stored."
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:version "22.1"
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:group 'gnus-fun
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:type 'directory)
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(defcustom gnus-x-face-omit-files nil
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"Regexp to match faces in `gnus-x-face-directory' to be omitted."
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:version "25.1"
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:group 'gnus-fun
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:type '(choice (const nil) regexp))
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(defcustom gnus-face-directory (expand-file-name "faces" gnus-directory)
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"Directory where Face PNG files are stored."
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:version "25.1"
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:group 'gnus-fun
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:type 'directory)
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(defcustom gnus-face-omit-files nil
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"Regexp to match faces in `gnus-face-directory' to be omitted."
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:version "25.1"
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:group 'gnus-fun
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:type '(choice (const nil) regexp))
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(defcustom gnus-convert-pbm-to-x-face-command "pbmtoxbm %s | compface"
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"Command for converting a PBM to an X-Face."
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:version "22.1"
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:group 'gnus-fun
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:type 'string)
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(defcustom gnus-convert-image-to-x-face-command
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"convert -scale 48x48! %s xbm:- | xbm2xface.pl"
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"Command for converting an image to an X-Face.
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The command must take an image filename (use \"%s\") as input.
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The output must be the X-Face header data on stdout."
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:version "22.1"
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:group 'gnus-fun
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:type '(choice (const :tag "giftopnm, netpbm (GIF input only)"
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"giftopnm %s | ppmnorm | pnmscale -width 48 -height 48 | ppmtopgm | pgmtopbm | pbmtoxbm | compface")
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(const :tag "convert"
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"convert -scale 48x48! %s xbm:- | xbm2xface.pl")
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(string)))
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(defcustom gnus-convert-image-to-face-command
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"convert -scale 48x48! %s -colors %d png:-"
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"Command for converting an image to a Face.
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The command must take an image filename (first format argument
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\"%s\") and the number of colors (second format argument: \"%d\")
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as input. The output must be the Face header data on stdout in
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PNG format."
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:version "22.1"
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:group 'gnus-fun
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:type '(choice (const :tag "djpeg, netpbm (JPG input only)"
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"djpeg %s | ppmnorm | pnmscale -width 48 -height 48 | ppmquant %d | pnmtopng")
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(const :tag "convert"
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"convert -scale 48x48! %s -colors %d png:-")
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(string)))
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(defun gnus-shell-command-to-string (command)
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"Like `shell-command-to-string' except not mingling ERROR."
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(with-output-to-string
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(call-process shell-file-name nil (list standard-output nil)
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nil shell-command-switch command)))
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;;;###autoload
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(defun gnus--random-face-with-type (dir ext omit fun)
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"Return file from DIR with extension EXT.
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Omit matches of OMIT, and process them by FUN."
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(when (file-exists-p dir)
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(let* ((files
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(remove nil (mapcar
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(lambda (f) (unless (string-match (or omit "^$") f) f))
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(directory-files dir t ext))))
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(file (and files (seq-random-elt files))))
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(when file
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(funcall fun file)))))
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;;;###autoload
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(autoload 'message-goto-eoh "message" nil t)
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(autoload 'message-insert-header "message" nil t)
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(defun gnus--insert-random-face-with-type (fun type)
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"Get a random face using FUN and insert it as a header TYPE.
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For instance, to insert an X-Face use `gnus-random-x-face' as FUN
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and \"X-Face\" as TYPE."
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(let ((data (funcall fun)))
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(save-excursion
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(if data
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(progn (message-goto-eoh)
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(insert type ": " data "\n"))
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(message
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"No face returned by the function %s." (symbol-name fun))))))
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;;;###autoload
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(defun gnus-random-x-face ()
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"Return X-Face header data chosen randomly from `gnus-x-face-directory'.
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Files matching `gnus-x-face-omit-files' are not considered."
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(interactive)
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(gnus--random-face-with-type
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gnus-x-face-directory "\\.pbm$" gnus-x-face-omit-files
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(lambda (file)
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(gnus-shell-command-to-string
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(format gnus-convert-pbm-to-x-face-command
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(shell-quote-argument file))))))
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;;;###autoload
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(defun gnus-insert-random-x-face-header ()
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"Insert a random X-Face header from `gnus-x-face-directory'."
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(interactive)
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(gnus--insert-random-face-with-type 'gnus-random-x-face 'X-Face))
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;;;###autoload
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(defun gnus-x-face-from-file (file)
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"Insert an X-Face header based on an image FILE.
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Depending on `gnus-convert-image-to-x-face-command' it may accept
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different input formats."
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(interactive "fImage file name: ")
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(when (file-exists-p file)
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(gnus-shell-command-to-string
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(format gnus-convert-image-to-x-face-command
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(shell-quote-argument (expand-file-name file))))))
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;;;###autoload
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(defun gnus-face-from-file (file)
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"Return a Face header based on an image FILE.
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Depending on `gnus-convert-image-to-face-command' it may accept
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different input formats."
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(interactive "fImage file name: ")
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(when (file-exists-p file)
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(let ((done nil)
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(attempt "")
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(quant 16))
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(while (and (not done)
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(> quant 1))
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(setq attempt
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(let ((coding-system-for-read 'binary))
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(gnus-shell-command-to-string
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(format gnus-convert-image-to-face-command
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(shell-quote-argument (expand-file-name file))
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quant))))
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(if (> (length attempt) 726)
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(progn
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(setq quant (- quant (if (< quant 10) 1 2)))
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(gnus-message 9 "Length %d; trying quant %d"
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(length attempt) quant))
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(setq done t)))
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(if done
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(mm-with-unibyte-buffer
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(insert attempt)
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(gnus-face-encode))
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nil))))
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(defun gnus-face-encode ()
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(let ((step 72))
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(base64-encode-region (point-min) (point-max))
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(goto-char (point-min))
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(while (search-forward "\n" nil t)
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(replace-match ""))
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(goto-char (point-min))
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(while (> (- (point-max) (point))
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step)
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(forward-char step)
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(insert "\n ")
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(setq step 76))
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(buffer-string)))
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;;;###autoload
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(defun gnus-convert-face-to-png (face)
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"Convert FACE (which is base64-encoded) to a PNG.
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The PNG is returned as a string."
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(mm-with-unibyte-buffer
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(insert face)
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(ignore-errors
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(base64-decode-region (point-min) (point-max)))
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(buffer-string)))
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;;;###autoload
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(defun gnus-convert-png-to-face (file)
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"Convert FILE to a Face.
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FILE should be a PNG file that's 48x48 and smaller than or equal to
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726 bytes."
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(mm-with-unibyte-buffer
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(insert-file-contents file)
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(when (> (buffer-size) 726)
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(error "The file is %d bytes long, which is too long"
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(buffer-size)))
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(gnus-face-encode)))
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;;;###autoload
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(defun gnus-random-face ()
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"Return randomly chosen Face from `gnus-face-directory'.
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Files matching `gnus-face-omit-files' are not considered."
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(interactive)
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(gnus--random-face-with-type gnus-face-directory "\\.png$"
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gnus-face-omit-files
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'gnus-convert-png-to-face))
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;;;###autoload
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(defun gnus-insert-random-face-header ()
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"Insert a random Face header from `gnus-face-directory'."
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(gnus--insert-random-face-with-type 'gnus-random-face 'Face))
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(defface gnus-x-face '((t (:foreground "black" :background "white")))
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"Face to show X-Face.
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The colors from this face are used as the foreground and background
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colors of the displayed X-Faces."
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:group 'gnus-article-headers)
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(declare-function article-narrow-to-head "gnus-art" ())
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(declare-function gnus-article-goto-header "gnus-art" (header))
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(declare-function gnus-add-image "gnus-art" (category image))
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(declare-function gnus-add-wash-type "gnus-art" (type))
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(defun gnus-display-x-face-in-from (data)
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"Display the X-Face DATA in the From header."
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(require 'gnus-art)
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(let (pbm)
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(when (or (gnus-image-type-available-p 'xface)
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(and (gnus-image-type-available-p 'pbm)
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(setq pbm (uncompface data))))
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(save-excursion
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(save-restriction
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(article-narrow-to-head)
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(gnus-article-goto-header "from")
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(when (bobp)
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(insert "From: [no 'from' set]\n")
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(forward-char -17))
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(gnus-add-image
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'xface
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(gnus-put-image
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(if (gnus-image-type-available-p 'xface)
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(apply #'gnus-create-image (concat "X-Face: " data) 'xface t
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(cdr (assq 'xface gnus-face-properties-alist)))
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(apply #'gnus-create-image pbm 'pbm t
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(cdr (assq 'pbm gnus-face-properties-alist))))
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nil 'xface))
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(gnus-add-wash-type 'xface))))))
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(defun gnus-grab-cam-x-face ()
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"Grab a picture off the camera and make it into an X-Face."
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(shell-command "xawtv-remote snap ppm")
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(let ((file nil))
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(while (null (setq file (directory-files "/tftpboot/sparky/tmp"
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t "snap.*ppm")))
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(sleep-for 1))
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(setq file (car file))
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(with-temp-buffer
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(shell-command
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(format "pnmcut -left 110 -top 30 -width 144 -height 144 '%s' | ppmnorm 2>%s | pnmscale -width 48 | ppmtopgm | pgmtopbm -threshold -value 0.92 | pbmtoxbm | compface"
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file null-device)
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(current-buffer))
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(delete-file file)
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(buffer-string))))
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(defun gnus-grab-cam-face ()
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"Grab a picture off the camera and make it into an X-Face."
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(shell-command "xawtv-remote snap ppm")
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(let ((file nil)
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(tempfile (make-temp-file "gnus-face-" nil ".ppm"))
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result)
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(while (null (setq file (directory-files "/tftpboot/sparky/tmp"
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t "snap.*ppm")))
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(sleep-for 1))
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(setq file (car file))
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(shell-command
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(format "pnmcut -left 110 -top 30 -width 144 -height 144 '%s' | pnmscale -width 48 -height 48 | ppmtopgm >> %s"
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file tempfile))
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(let ((gnus-convert-image-to-face-command
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(format "cat '%%s' | ppmquant %%d | ppmchange %s | pnmtopng"
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(gnus-fun-ppm-change-string))))
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(setq result (gnus-face-from-file tempfile)))
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(delete-file file)
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result))
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(defun gnus-fun-ppm-change-string ()
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(let* ((possibilities '("%02x0000" "00%02x00" "0000%02x"
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"%02x%02x00" "00%02x%02x" "%02x00%02x"))
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(format (concat "'#%02x%02x%02x' '#"
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(seq-random-elt possibilities)
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"'"))
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(values nil))
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(dotimes (i 255)
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(push (format format i i i i i i)
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values))
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(mapconcat #'identity values " ")))
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(defun gnus-funcall-no-warning (function &rest args)
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(when (fboundp function)
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(apply function args)))
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(provide 'gnus-fun)
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;;; gnus-fun.el ends here
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