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+;;; sisu-spine-mode.el --- Major mode for SiSU (spine parser) markup text
+
+;; Copyright (C) 2011, 2021  Free Software Foundation, Inc.
+
+;; Author: Ralph Amissah & Ambrose Kofi Laing
+;; Maintainer: Ralph Amissah <ralph.amissah@gmail.com>
+;; Keywords: text, syntax, processes, tools
+;; Version:   8.0.0
+;; URL: https://www.sisudoc.org/
+;; originally looked at (based on) doc-mode, with kind permission of the author
+;;   Author: SUN, Tong <suntong001@users.sf.net>, (c)2001-6, all right reserved
+;;   Version: $Date: 2006/01/19 03:13:41 $ $Revision: 1.14 $
+;;   Home URL: https://xpt.sourceforge.net/
+;; with contributions from Kevin Ryde and Stefan Monnier
+
+;; This program is free software; you can redistribute it and/or modify
+;; it under the terms of the GNU General Public License as published by
+;; the Free Software Foundation; either version 3, or (at your option)
+;; any later version.
+;;
+;; This program is distributed in the hope that it will be useful,
+;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;; GNU General Public License for more details.
+;;
+;; You should have received a copy of the GNU General Public License
+;; along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+;; Viva Software Libre!
+;; Support the free software movement!
+;; ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+;;; Commentary:
+
+;; SiSU (https://www.sisudoc.org/) is a document structuring and
+;; publishing framework.  This package provides an Emacs major mode
+;; for SiSU markup, as used by the spine parser (in D) which has a different
+;; header (based on yaml) from the original sisu parser (in Ruby) which has
+;; bespoke headers.
+
+;; When this package is installed, files ending in ".sst" are automatically
+;; associated with sisu-spine-mode.  If a file doesn't have a
+;; .sst extension, add a first line:
+;; # -*- sisuSpine -*-
+
+;; The documentation for the "Structure Of The Hierarchy Text" can be
+;; found in the sisustring for the sisu-spine-mode function.
+
+;;; Code:
+
+;; Variables:
+
+(defgroup sisu-faces nil
+  "AsciiSisu highlighting"
+  :group 'sisus)
+
+;; == Colors
+; color n is more prominent than color n+1
+
+(defface sisu-title-1-face
+  `((((class color)
+      (background dark))
+     (:foreground "brown3" :bold t :height 1.2 :inherit variable-pitch))
+    (((class color)
+      (background light))
+     (:foreground "brown3" :bold t :height 1.2 :inherit variable-pitch))
+    (t (:weight bold :inherit variable-pitch)))
+  "Face for AsciiSisu titles at level 1."
+  :group 'sisu-faces)
+
+(defface sisu-title-2-face
+  `((((class color)
+      (background dark))
+     (:foreground "yellow4" :bold t :height 1.1 :inherit variable-pitch))
+    (((class color)
+      (background light))
+     (:foreground "yellow4" :bold t :height 1.1 :inherit variable-pitch))
+    (t (:weight bold :inherit variable-pitch)))
+  "Face for AsciiSisu titles at level 2."
+  :group 'sisu-faces)
+
+(defface sisu-title-3-face
+  `((((class color)
+      (background dark))
+     (:foreground "sienna3" :bold t))
+    (((class color)
+      (background light))
+     (:foreground "sienna3" :bold t))
+    (t (:weight bold)))
+  "Face for AsciiSisu titles at level 3."
+  :group 'sisu-faces)
+
+(defface sisu-title-4-face
+  `((((class color)
+      (background dark))
+     (:foreground "burlywood3"))
+    (((class color)
+      (background light))
+     (:foreground "burlywood3"))
+    (t ()))
+  "Face for AsciiSisu titles at level 4."
+  :group 'sisu-faces)
+
+(defface info-node
+  '((((class color) (background light)) (:foreground "brown" :bold t :italic t))
+    (((class color) (background dark)) (:foreground "white" :bold t :italic t))
+    (t (:bold t :italic t)))
+  "Face for Info node names."
+  :group 'sisu-faces)
+
+(defvar sisu-title-1 'sisu-title-1-face)
+(defvar sisu-title-2 'sisu-title-2-face)
+(defvar sisu-title-3 'sisu-title-3-face)
+(defvar sisu-title-4 'sisu-title-4-face)
+
+(defvar sisu-general-font-lock-red1 font-lock-warning-face)
+(defvar sisu-general-font-lock-red2 font-lock-comment-face)
+(defvar sisu-general-font-lock-red3 font-lock-string-face)
+
+(defvar sisu-general-font-lock-green1 font-lock-type-face)
+(defvar sisu-general-font-lock-green2 font-lock-constant-face)
+
+(defvar sisu-general-font-lock-blue1 font-lock-keyword-face)
+(defvar sisu-general-font-lock-blue2 font-lock-function-name-face)
+(defvar sisu-general-font-lock-blue3 font-lock-builtin-face)
+
+(defvar sisu-general-font-lock-yellow1 font-lock-variable-name-face)
+(defvar sisu-general-font-lock-yellow2 font-lock-comment-face)
+
+;; == sisu-spine-mode settings
+
+(defvar sisu-spine-mode-hook nil
+  "Normal hook run when entering Sisu Text mode.")
+
+(defvar sisu-spine-mode-abbrev-table nil
+  "Abbrev table in use in Sisu-spine-mode buffers.")
+(define-abbrev-table 'sisu-spine-mode-abbrev-table ())
+
+(defconst sisu-font-lock-keywords
+  (eval-when-compile
+    (list
+      ;;grouped text ---------
+      ;(cons "^```[ ]code\\(.\\|\n\\)+?\n```\n"      'sisu-general-font-lock-red2)
+      (cons "^```[ ]+code.*?$\\|^```$"  'sisu-general-font-lock-red2)
+      (cons "^```[ ]+table.*?$\\|^```$" 'sisu-general-font-lock-red2)
+      (cons "^```[ ]+group$\\|^```$"    'sisu-general-font-lock-red2)
+      (cons "^```[ ]+block$\\|^```$"    'sisu-general-font-lock-red2)
+      (cons "^```[ ]+poem$\\|^```$"     'sisu-general-font-lock-red2)
+      (cons "^```[ ]+alt$\\|^```$"      'sisu-general-font-lock-red2)
+      ;;grouped text ---------
+      (cons "^group{\\|^}group"       'sisu-general-font-lock-red2)
+      (cons "^block{\\|^}block"       'sisu-general-font-lock-red2)
+      (cons "^code{\\|^}code"         'sisu-general-font-lock-red2)
+      (cons "^poem{\\|^}poem"         'sisu-general-font-lock-red2)
+      (cons "^alt{\\|^}alt"           'sisu-general-font-lock-red2)
+      (cons "^table{.+\\|^}table"     'sisu-general-font-lock-red2)
+      (cons "^{table[^}]+}"           'sisu-general-font-lock-red2)
+
+      (list
+        (concat
+          "^\`\\{3\\}[ ]+code.*?$"
+          "\\(.\\|\n\\)+?"
+          "\`\\{3\\}$"
+        )
+        '(1 sisu-general-font-lock-red2 t)
+        '(2 nil t)
+        '(3 sisu-general-font-lock-red2 t)
+      )
+      (list
+        (concat
+          "^\`\\{3\\}[ ]+table.*?$"
+          "\\(.\\|\n\\)+?"
+          "\`\\{3\\}$"
+        )
+        '(1 sisu-general-font-lock-red2 t)
+        '(2 nil t)
+        '(3 sisu-general-font-lock-red2 t)
+      )
+      (list
+        (concat
+          "^\`\\{3\\}[ ]+\\(group\\|block\\|alt\\|poem\\)$"
+          "\\(.\\|\n\\)+?"
+          "^\`\\{3\\}$"
+        )
+        '(1 sisu-general-font-lock-red2 t)
+        '(2 nil t)
+        '(3 sisu-general-font-lock-red2 t)
+      )
+
+      ;; footnote/endnote ----
+      ;(cons "\~{.+?}\~"  'sisu-general-font-lock-green1)
+      (cons "\~{\\*\\*\\|\~{\\*\\|\~{\\|}\~"   'sisu-general-font-lock-red2)
+      (cons "\~\\[\\+\\|\~\\[\\*\\|\~\\[\\|\\]\~"  'sisu-general-font-lock-red2)
+      (cons "\~\\^ \\|^\\^\~ " 'sisu-general-font-lock-red2)
+      (list
+        (concat
+          "\\(\*\~\\)"
+          "\\([^ \r\t\n]+\\)"
+        )
+        '(1 sisu-general-font-lock-red1 t)
+        '(2 sisu-general-font-lock-blue2 t)
+      )
+
+      ;; emphasis (can be program configured to be bold italics or underscore)
+      (list
+        (concat
+          "\\([*]{\\)"
+          "\\([^}]+\\)"
+          "\\(}[*]\\)"
+        )
+        '(1 sisu-general-font-lock-red1 t)
+        '(2 sisu-general-font-lock-red1 t)
+        '(3 sisu-general-font-lock-red1 t)
+      )
+
+      ;; bold ----------------
+      (list
+        (concat
+          "\\([!]{\\)"
+          "\\([^}]+\\)"
+          "\\(}[!]\\)"
+        )
+        '(1 sisu-general-font-lock-red1 t)
+        '(2 sisu-general-font-lock-red1 t)
+        '(3 sisu-general-font-lock-red1 t)
+      )
+      (cons "\\*[^ ]+\\*"               'sisu-general-font-lock-red1)
+      (cons "^!_ .+"                    'sisu-general-font-lock-red1)
+
+      ;; italics -------------
+      (list
+        (concat
+          "\\([/]{\\)"
+          "\\([^}]+\\)"
+          "\\(}[/]\\)"
+        )
+        '(1 sisu-general-font-lock-red1 t)
+        '(2 sisu-general-font-lock-blue1 t)
+        '(3 sisu-general-font-lock-red1 t)
+      )
+
+      ;; underscore ----------
+      (list
+        (concat
+          "\\([_]{\\)"
+          "\\([^}]+\\)"
+          "\\(\}[_]\\)"
+        )
+        '(1 sisu-general-font-lock-red1 t)
+        '(2 sisu-general-font-lock-red1 t)
+        '(3 sisu-general-font-lock-red1 t)
+      )
+
+      ;; monospace -----------
+      (list
+        (concat
+          "\\([#]{\\)"
+          "\\([^}]+\\)"
+          "\\(}[#]\\)"
+        )
+        '(1 sisu-general-font-lock-red1 t)
+        '(2 sisu-general-font-lock-red1 t)
+        '(3 sisu-general-font-lock-red1 t)
+      )
+
+      ;; citation ------------
+      (list
+        (concat
+          "\\([\"]{\\)"
+          "\\([^}]+\\)"
+          "\\(}[\"]\\)"
+        )
+        '(1 sisu-general-font-lock-red1 t)
+        '(2 sisu-general-font-lock-red1 t)
+        '(3 sisu-general-font-lock-red1 t)
+      )
+
+      ;; inserted text -------
+      (list
+        (concat
+          "\\([\+]{\\)"
+          "\\([^}]+\\)"
+          "\\(}[\+]\\)"
+        )
+        '(1 sisu-general-font-lock-red1 t)
+        '(2 sisu-general-font-lock-red1 t)
+        '(3 sisu-general-font-lock-red1 t)
+      )
+
+      ;; strike through ------
+      (list
+        (concat
+          "\\(\\-{\\)"
+          "\\([^}]+\\)"
+          "\\(}\\-\\)"
+        )
+        '(1 sisu-general-font-lock-red1 t)
+        '(2 sisu-general-font-lock-red1 t)
+        '(3 sisu-general-font-lock-red1 t)
+      )
+
+      ;; superscript ---------
+      (list
+        (concat
+          "\\(\\^{\\)"
+          "\\([^}]+\\)"
+          "\\(}\\^\\)"
+        )
+        '(1 sisu-general-font-lock-red1 t)
+        '(2 sisu-general-font-lock-red1 t)
+        '(3 sisu-general-font-lock-red1 t)
+      )
+
+      ;; subscript -----------
+      (list
+        (concat
+          "\\([,]{\\)"
+          "\\([^}]+\\)"
+          "\\(}[,]\\)"
+        )
+        '(1 sisu-general-font-lock-red1 t)
+        '(2 sisu-general-font-lock-red1 t)
+        '(3 sisu-general-font-lock-red1 t)
+      )
+
+      ;; numbered list
+      (cons "^# \\|^_# "                'sisu-general-font-lock-red1)
+
+      ;; bullet text
+      (cons "^_\\*[1-9] \\|^_\\* "      'sisu-general-font-lock-red1)
+
+      ;; indented text
+      (cons "^_[1-9] "                  'sisu-general-font-lock-red1)
+      (cons "^_[1-9]! "                 'sisu-general-font-lock-red1)
+
+      ;; hanging indented text [proposed enable when implemented]
+      (cons "^__[1-9] "                'sisu-general-font-lock-red1)
+      (cons "^_[0-9]_[0-9] "           'sisu-general-font-lock-red1)
+      (cons "^__[1-9]! "               'sisu-general-font-lock-red1)
+      (cons "^_[0-9]_[0-9]! "          'sisu-general-font-lock-red1)
+
+      ;; url
+      (cons "\\(^\\|[ ]\\)https?:[/][/][^ \t\n\r<]+" 'sisu-general-font-lock-blue2)
+
+      ;; Comment Lines
+      (cons "^% .*"                     'sisu-general-font-lock-blue1)
+
+      ;; page break
+      (cons "^\\(-\\\\\\\\-\\|=\\\\\\\\=\\|-\\.\\.-\\)" 'sisu-general-font-lock-red2)
+
+      ;; line break
+      (cons " \\\\\\\\ "                'sisu-general-font-lock-red1)
+
+      ;; line break (depreciated)
+      (cons "<br>"                      'sisu-general-font-lock-red1)
+
+      ;; Section titles
+      (list "^\\(\\([1-4]\\|:?[A-D]\\)\\~\\)\\(.*\\)"
+        '(1 sisu-title-1 t)
+        '(3 sisu-title-2 t)
+      )
+
+      ;; hyper-links
+      (list
+        (concat
+          "\\({~^\\|{\\)"
+          "\\([^}{]+\\)"
+          "\\(}https?:[/][/][^ \r\n\t<]+\\)"
+        )
+        '(1 sisu-general-font-lock-blue2 t)
+        '(2 sisu-general-font-lock-red1 t)
+        '(3 sisu-general-font-lock-blue2 t)
+      )
+
+      ;; book index
+      (list
+        (concat
+          "^\\(\={\\)"
+          "\\([^}{]+\\)"
+          "\\(}\\)$"
+        )
+        '(1 sisu-general-font-lock-green1 t)
+        '(2 nil t)
+        '(3 sisu-general-font-lock-green1 t)
+      )
+
+      ;(cons "^\={.+}"                 'sisu-general-font-lock-green1)
+
+      ;; numbers
+      (cons "\\<[.0-9]+\\>"             'sisu-general-font-lock-green2)
+
+      ;; bullets sisu_normal (nearly copied regexp)
+      (cons "^_\\([1-9*]\\|[1-9]\\*\\) " 'sisu-general-font-lock-blue2)
+
+      ;; image links
+      (list
+        (concat
+          "\\({\\)"
+          "\\([^}{]+\\)"
+          "\\(}image\\)"
+        )
+        '(1 sisu-general-font-lock-blue2 t)
+        '(2 sisu-general-font-lock-red1 t)
+        '(3 sisu-general-font-lock-blue2 t)
+      )
+
+      ;; insert file links
+      (list
+        (concat
+          "\\(<< \\)"
+          "\\([^ \r\t\n]+\\.ss\\)"
+          "\\(i\\|t\\)"
+        )
+        '(1 sisu-general-font-lock-blue2 t)
+        '(2 sisu-general-font-lock-blue2 t)
+        '(3 sisu-general-font-lock-blue2 t)
+      )
+
+      ;; raw keywords
+      (list
+        (concat
+          "^\\(\\("
+          "creator\\|"
+          "title\\|"
+          "date\\|"
+          "rights\\|"
+          "publisher\\|"
+          "classify\\|"
+          "identifier\\|"
+          "original\\|"
+          "notes\\|"
+          "links\\|"
+          "make\\|"
+          "\\):\\)\\(.*\\)"
+        )
+        '(1 sisu-title-2 keep)
+        '(3 sisu-title-3 keep)
+      )
+    )
+  )
+  "Default expressions to highlight in AsciiSisu mode."
+)
+
+;; outline mode evil "folding" if available
+;; (define-key evil-normal-state-map ",0"   'show-all)
+;; (define-key evil-normal-state-map ",-"   'hide-body)
+;; (define-key evil-normal-state-map ",+"   'show-subtree)
+;; (define-key evil-normal-state-map ",="   'show-subtree)
+
+;;
+
+;; Sisu & Autoload:
+
+;;;###autoload
+(define-derived-mode sisu-spine-mode text-mode "SiSU"
+  "Major mode for editing SiSU files.
+SiSU document structuring, publishing in multiple formats and search.
+URL `https://www.sisudoc.org/'"
+  (modify-syntax-entry ?\'  ".")
+  ;;(flyspell-mode nil)
+
+  (make-local-variable 'paragraph-start)
+  (setq paragraph-start (concat "$\\|>" page-delimiter))
+  (make-local-variable 'paragraph-separate)
+  (setq paragraph-separate paragraph-start)
+  (make-local-variable 'paragraph-ignore-fill-prefix)
+  (setq paragraph-ignore-fill-prefix t)
+
+  (set (make-local-variable 'outline-regexp)
+       "^\\(\\([1-4]\\|:?[A-D]\\)\\~\\|\\@[a-z]+:\\( \\|$\\)\\)")
+
+  (make-local-variable 'require-final-newline)
+  (setq require-final-newline t)
+
+  (make-local-variable 'font-lock-defaults)
+  (setq font-lock-defaults
+        '(sisu-font-lock-keywords
+          nil                           ; KEYWORDS-ONLY: no
+          nil                           ; CASE-FOLD: no
+          ((?_ . "w"))                  ; SYNTAX-ALIST
+          ))
+  ;; Enable outlining.
+  ;; TODO with outlining make sure linum (line numbering) is off,
+  ;; else performance penalty, sucks bigtime
+  (outline-minor-mode 1))
+
+;;;###autoload (add-to-list 'auto-mode-alist '("\\.ss[imt]\\'" . sisu-spine-mode))
+
+(provide 'sisu-spine-mode)
+
+;;
+
+;;; sisu-spine-mode.el ends here