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;; -*- lexical-binding: t -*-
(require 'image)
(require 'seq)
(defcustom ennum-image-convert-path
"convert"
"Path to imagemagick convert executable."
:type 'string
:group 'ennum)
(defcustom ennum-image-identify-path
"identify"
"Path to imagemagick identify executable."
:type 'string
:group 'ennum)
(defcustom ennum-image-jpegtran-path
"jpegtran"
"Path to jpegtran executable."
:type 'string
:group 'ennum)
(defcustom ennum-image-optipng-path
"optipng"
"Path to optipng executable."
:type 'string
:group 'ennum)
;; Check if all necessary image types are supported
(seq-do (lambda (image-type)
(unless (image-type-available-p image-type)
(lwarn '(ennum) :error "`%s' image type not supported" image-type)))
'(jpeg png svg))
;; Check for existence of external image processing utilities
(seq-do (lambda (external-program)
(unless (executable-find external-program)
(lwarn '(ennum) :error "`%s' not found" external-program)))
(list ennum-image-convert-path
ennum-image-identify-path
ennum-image-jpegtran-path
ennum-image-optipng-path))
(defun ennum-image-resize-image (infile-path outfile-path width)
"A simple shell wrapper around ImageMagick's convert"
(ennum-image--assert-file-exists infile-path)
(cl-case (image-type infile-path)
(svg
(copy-file infile-path outfile-path t))
(otherwise
(call-process ennum-image-convert-path nil nil nil
infile-path "-resize" (format "%d>" width) outfile-path)))
outfile-path)
(defun ennum-image-optimize-image (image-path)
"A simple shell wrapper around jpegtran and optipng"
(ennum-image--assert-file-exists image-path)
(cl-case (image-type image-path)
(jpeg
(call-process ennum-image-jpegtran-path
nil nil nil "-optimize"
"-progressive" "-copy" "none"
"-outfile" image-path image-path))
(png
(call-process ennum-image-optipng-path
nil nil nil image-path)))
image-path)
(defun ennum-image-get-width (image-path)
(ennum-image--assert-file-exists image-path)
(cl-case (image-type image-path)
(svg 1e+INF)
(otherwise
(with-temp-buffer
(call-process ennum-image-identify-path nil t nil
"-format" "%w" image-path)
(string-to-number (buffer-string))))))
(defun ennum-image--assert-file-exists (path)
(unless (file-exists-p path)
(error "File %s does not exist" path)))
(provide 'ennum-image)
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