/usr/share/doc/elpa-deferred/deferred-samples.el is in elpa-deferred 0.5.0-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 | ;; deferred.el samples -*- lexical-binding: t; -*-
(require 'cl-lib)
(require 'deferred)
;;; Basic Chain
(deferred:$
(deferred:next
(lambda () (message "deferred start")))
(deferred:nextc it
(lambda ()
(message "chain 1")
1))
(deferred:nextc it
(lambda (x)
(message "chain 2 : %s" x)))
(deferred:nextc it
(lambda ()
(read-minibuffer "Input a number: ")))
(deferred:nextc it
(lambda (x)
(message "Got the number : %i" x)))
(deferred:error it
(lambda (err)
(message "Wrong input : %s" err))))
;;; Timer
(deferred:$
(deferred:wait 1000) ; 1000msec
(deferred:nextc it
(lambda (x)
(message "Timer sample! : %s msec" x))))
;;; Command process
(deferred:$
(deferred:process "ls" "-la")
(deferred:nextc it
(lambda (x) (insert x))))
;;; Web Access
;; Simple web access
(require 'url)
(deferred:$
(deferred:url-retrieve "http://www.gnu.org")
(deferred:nextc it
(lambda (buf)
(insert (with-current-buffer buf (buffer-string)))
(kill-buffer buf))))
;; Get an image
(deferred:$
(deferred:url-retrieve "http://www.google.co.jp/intl/en_com/images/srpr/logo1w.png")
(deferred:nextc it
(lambda (buf)
(insert-image
(create-image
(let ((data (with-current-buffer buf (buffer-string))))
(substring data (+ (string-match "\n\n" data) 2)))
'png t))
(kill-buffer buf))))
;; HTTP POST
(deferred:$
(deferred:url-post
"http://127.0.0.1:8080/post-test.cgi"
'(('a . "test") ('param . "OK")))
(deferred:nextc it
(lambda (buf)
(insert (with-current-buffer buf (buffer-string)))
(kill-buffer buf))))
;; Parallel deferred
(deferred:$
(deferred:parallel
(lambda ()
(deferred:url-retrieve "http://www.google.co.jp/intl/en_com/images/srpr/logo1w.png"))
(lambda ()
(deferred:url-retrieve "http://www.google.co.jp/images/srpr/nav_logo14.png")))
(deferred:nextc it
(lambda (buffers)
(cl-loop for i in buffers
do
(insert
(format
"size: %s\n"
(with-current-buffer i (length (buffer-string)))))
(kill-buffer i)))))
;; Get an image by wget and resize by ImageMagick
(deferred:$
;; try
(deferred:$
(deferred:process "wget" "-O" "a.jpg" "http://www.gnu.org/software/emacs/tour/images/splash.png")
(deferred:nextc it
(lambda () (deferred:process "convert" "a.jpg" "-resize" "100x100" "jpg:b.jpg")))
(deferred:nextc it
(lambda ()
(clear-image-cache)
(insert-image (create-image (expand-file-name "b.jpg") 'jpeg nil)))))
;; catch
(deferred:error it ;
(lambda (err)
(insert "Can not get a image! : " err)))
;; finally
(deferred:nextc it
(lambda ()
(deferred:parallel
(lambda () (delete-file "a.jpg"))
(lambda () (delete-file "b.jpg")))))
(deferred:nextc it
(lambda (x) (message ">> %s" x))))
;; Timeout Process
(deferred:$
(deferred:earlier
(deferred:process "sh" "-c" "sleep 3 | echo 'hello!'")
(deferred:$
(deferred:wait 1000) ; timeout msec
(deferred:nextc it (lambda () "canceled!"))))
(deferred:nextc it
(lambda (x) (insert x))))
;; Loop and animation
(let ((count 0) (anm "-/|\\-")
(end 50) (pos (point))
(wait-time 50))
(deferred:$
(deferred:next
(lambda (_) (message "Animation started.")))
(deferred:nextc it
(deferred:lambda (_)
(save-excursion
(when (< 0 count)
(goto-char pos) (delete-char 1))
(insert (char-to-string
(aref anm (% count (length anm))))))
(if (> end (cl-incf count))
(deferred:nextc (deferred:wait wait-time) self))))
(deferred:nextc it
(lambda (_)
(save-excursion
(goto-char pos) (delete-char 1))
(message "Animation finished.")))))
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