emacs+qpdf

qpdf
http://qpdf.sourceforge.net/
“QPDF is a command-line program that does structural, content-preserving transformations on PDF files.”

Usare qpdf per editare pdf a volte è molto utile.
Questo è uno banale qpdf-mode
che serve solo per commentare sezioni del pdf
(uso dwim, dovrebbe essere di default).
`
;; qpdf-mode.el
;; the command to comment/uncomment text
(defun qdf-comment-dwim (arg)
“Comment or uncomment current line or region in a smart way.
For detail, see `comment-dwim'.”
(interactive “*P”)
(require 'newcomment)
(let ((deactivate-mark nil) (comment-start “%”) (comment-end “”))
(comment-dwim arg)))

;; keywords for syntax coloring
(setq myKeywords
`(
;; ( ,(regexp-opt '(“Sin” “Cos” “Sum”) 'word) . font-lock-function-name-face)
;; ( ,(regexp-opt '(“Pi” “Infinity”) 'word) . font-lock-constant-face)
)
)

;; define the major mode.
(define-derived-mode qdf-mode fundamental-mode
“qdf-mode is a major mode for editing language qdf.”
(setq font-lock-defaults '(myKeywords))

;; modify the keymap
(define-key qdf-mode-map [remap comment-dwim] 'qdf-comment-dwim)

(modify-syntax-entry ?% “< b" qdf-mode-syntax-table) (modify-syntax-entry ?\n "> b” qdf-mode-syntax-table)
)
`