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Help with delimiters and math mode

These customizations are mostly for faster insertion of special characters (and math mode).

;;; Useful AUCTeX setup for ConTeXt (for your .emacs)
;;; Sanjoy Mahajan (, 2006-04-20.  No copyright.
;;; With recent AUCTeX (11.50 or later), editing ConTeXt files should
;;; just work, but I use the following elisp as well.

; the AUCTeX manual recommends these settings
(setq TeX-parse-self t)			; Enable parse on load.
(setq TeX-auto-save t)			; Enable parse on save.

; for outline views (hide/show sections, chapters, etc.)
(add-hook 'TeX-mode-hook '(lambda () (TeX-fold-mode 1)))
(add-hook 'TeX-mode-hook '(lambda () (outline-minor-mode 1)))
; make PDF by default (can toggle with C-c C-t C-p
(add-hook 'TeX-mode-hook '(lambda () (TeX-PDF-mode 1)))
; these math abbrevs (` as prefix char) are also useful in TeX/ConTeXt files
(require 'latex)			; defines LaTeX-math-mode
(add-hook 'TeX-mode-hook 'LaTeX-math-mode)
; Emacs help for \label, \ref, \cite.  Normally used only with
; LaTeX-mode but also useful with plain TeX + eplain and with ConTeXt, so:
(setq reftex-plug-into-AUCTeX t)
(add-hook 'TeX-mode-hook 'reftex-mode)

(defun insert-balanced (left right)
  "Insert a left, right delmiter pair and be poised to type inside them."
  (insert left)
    (insert right)))

; When start-context-math() is bound to $:
; Typing one $ gets you $$ with the insertion point between them.
; Typing a second $ turns the $$ into ConTeXt's form for displayed math:
;   \placeformula\startformula
;   [blank line with insertion point at beginning]
;   \stopformula
; Delete the \placeformula if you don't want equations numbered automatically.

(defun start-context-math ()
  (let* ((start (max (point-min) (- (point) 1)))
	 (stop  (min (point-max) (+ (point) 1))))
    ; if in the middle of a $$, turn inline math into context display math
    (if (equal "$$" (buffer-substring-no-properties start stop))
	  (delete-region start stop)	;get rid of the $$
	  ; delete preceding spaces, if any
	  (while (and (< (point-min) (point))
		      (equal (buffer-substring-no-properties (- (point) 1)
			     " "))
	    (backward-delete-char 1))
	  ; delete a preceding newline, if any
	  (if (equal (buffer-substring-no-properties (- (point) 1)
	    (backward-delete-char 1))
	  ; ConTeXt's display math with automatic equation numbering
	  (insert "\n\\placeformula\\startformula\n")
	  (save-excursion (insert "\n\\stopformula")))
      ; else: just doing inline math
      (insert-balanced ?\$ ?\$))))

; automatically insert right delimiter for $, {, [, and ( and be
; poised to type inside them.
(add-hook 'TeX-mode-hook
	  '(lambda ()
	     (local-set-key "$" 
			    '(lambda ()
			       (insert-balanced ?\$ ?\$)))
	     (local-set-key "{"
			    '(lambda ()
			       (insert-balanced ?\{ ?\})))
	     (local-set-key "["
			    '(lambda ()
			       (insert-balanced ?\[ ?\])))
	     (local-set-key "("
			    '(lambda ()
			       (insert-balanced ?\( ?\))))))

; For ConTeXt mode, inserting two $ signs needs to behave specially
(add-hook 'ConTeXt-mode-hook
	  '(lambda ()
	     (local-set-key "$" 'start-context-math)))

; The TeX-format-list from AUCTeX's tex.el (v11.82) with a few more
; ConTeXt-specific patterns.  I've submitted it to the AUCTeX lists,
; so later versions should have them automatically and you won't need
; this regexp mess in your .emacs
(setq TeX-format-list
  '(("JLATEX" japanese-latex-mode
    ("JTEX" japanese-plain-tex-mode
     "-- string likely in Japanese TeX --")
    ("AMSTEX" ams-tex-mode
    ("CONTEXT" context-mode
    ("LATEX" latex-mode
    ("TEX" plain-tex-mode ".")))

Help with natural tables

These customizations, by Johan Sandblom, make entering natural tables easy.

(defun context-insert-nattab (rows columns)
  ;; Johan Sandblom 2006-01-28
  "Insert a TABLE skeleton"
  (interactive "nNumber of rows: \nnNumber of columns: \n")
  (insert "\\bTABLE\n\\setupTABLE\[\]\n")
  ;; First a TABLE header
  (insert "\\bTABLEhead\n\\bTR\\bTH \\eTH\n")
  (let ((column 1))
    (while (< column (- columns 1))
      (insert "    \\bTH \\eTH\n")
      (setq column (1+ column))))
  (insert "    \\bTH \\eTH\\eTR\n\\eTABLEhead\n\\bTABLEbody\n")
  ;; The rows and columns
  (let ((row 1))
    (while (<= row rows)
      (insert "\\bTR\\bTD \\eTD\n")
      ;; The let expression makes sure that each loop starts at the
      ;; right place
      (let ((column 1))
	(while (< column (- columns 1))
	  (insert "    \\bTD \\eTD\n")
	  (setq column (1+ column)))
	(insert "    \\bTD \\eTD\\eTR\n")
	(setq row (1+ row))))
    (insert "\\eTABLEbody\n\\eTABLE\n")))

(defun context-insert-nattab-row (columns)
 "Insert a row in a TABLE"
 (interactive "nNumber of columns: \n")
 (insert "\\bTR\\bTD \\eTD\n")
 (let ((column 1))
   (while (< column (- columns 1))
     (insert "    \\bTD \\eTD\n")
     (setq column (1+ column)))
   (insert "    \\bTD \\eTD\\eTR\n")))

(defun context-insert-nattab-column (&optional arg)
 "Insert a column in a TABLE"
 (interactive "P")
 (insert "\\bTD \\eTD")
 (backward-char 5))

(add-hook 'ConTeXt-mode-hook
         '(lambda ()
	    (local-set-key "\C-cnr" 'context-insert-nattab-row)
	    (local-set-key "\C-cnc" 'context-insert-nattab-column)
	    (local-set-key "\C-cnn" 'context-insert-nattab)))

Help with FLOW charts (from m-chart.tex)

;; Johan Sandblom. No copyright.
(defun context-FLOW-shift-cells (x y beg end)
  "Shifts FLOW cells in region right and down"
  (interactive "nRight: \nnDown: \nr")
    (goto-char beg)
      (while (search-forward-regexp
	      "{\\([0-9]+\\),\\([0-9]+\\)}" end t)
	  (concat "{" (number-to-string 
		       (+ (string-to-number (match-string 1)) x))
		  ","  (number-to-string 
		       (+ (string-to-number (match-string 2)) y)) "}")
	  nil nil))))

(defun context-FLOW-insert-cells (%optional n)
 "Insert a FLOWchart cell"
 (interactive "P")
 (if (not (bolp)) (newline))
 (let ((x 1))
   (while (<= x (if n n 1))
     (insert "\\startFLOWcell\n")
     (insert "  \\name          {}\n")
     (insert "  \\location      {}\n")
     (insert "  \\shape         {action}\n")
     (insert "  \\text          {}\n")
     (insert "  \\connection[rl]{}\n")
     (insert "\\stopFLOWcell\n")
     (setq x (1+ x)))))
(add-hook 'ConTeXt-mode-hook
         '(lambda ()
	    (define-key (current-local-map) "\C-cnF" 'context-FLOW-insert-cells)
            (define-key (current-local-map) "\C-cnS" 'context-FLOW-shift-cells)))

Metapost-mode and r-mode (from ESS, in context-mode with mmm-mode

;; Johan Sandblom. No copyright.
(require 'mmm-mode)
(setq mmm-global-mode 'maybe)
(setq mmm-submode-decoration-level 2)
(mmm-add-group 'context-plus
                  :submode r-mode
                  :face mmm-comment-submode-face
                  :front ".*\\\\startR\\w*\\({\\w*}\\|\\[\\w*\\]\\|\\)\\W*"
                  :back  ".*\\\\stopR")
                  :submode metapost-mode
                  :face mmm-code-submode-face
                  :front ".*\\\\start\\w*MP\\w*\\({\\w*}\\|\\[\\w*\\]\\|\\)\\W*"
                  :back  ".*\\\\stop\\w*MP")
(add-to-list 'mmm-mode-ext-classes-alist '(context-mode nil context-plus))


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