From 6d0fecb89385c58cf4dd83237a4ca9e9afe9babe Mon Sep 17 00:00:00 2001
From: Stefan Monnier <monnier@iro.umontreal.ca>
Date: Thu, 25 Feb 2016 23:13:16 -0500
Subject: [PATCH] * sed-mode: New package

---
 packages/sed-mode/sed-mode.el | 139 ++++++++++++++++++++++++++++++++++
 1 file changed, 139 insertions(+)
 create mode 100644 packages/sed-mode/sed-mode.el

diff --git a/packages/sed-mode/sed-mode.el b/packages/sed-mode/sed-mode.el
new file mode 100644
index 000000000..ba29bc53f
--- /dev/null
+++ b/packages/sed-mode/sed-mode.el
@@ -0,0 +1,139 @@
+;;; sed-mode.el --- Major mode to edit sed scripts  -*- lexical-binding: t; -*-
+
+;; Copyright (C) 2016  Free Software Foundation, Inc.
+
+;; Author: Stefan Monnier <monnier@iro.umontreal.ca>
+;; Version: 0
+;; Keywords:
+
+;; 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 of the License, 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 <http://www.gnu.org/licenses/>.
+
+;;; Commentary:
+
+;; If you need this major mode, you might also want to
+;; consider spending some time with `M-x doctor'.
+
+;;; Code:
+
+(require 'cl-lib)
+(require 'smie)
+
+(defgroup sed-mode nil
+  "Major mode to edit sed code."
+  :group 'programming)
+
+
+(defvar sed-mode-syntax-table
+  (let ((st (make-syntax-table)))
+    (modify-syntax-entry ?# "<" st)
+    (modify-syntax-entry ?\n ">" st)
+    (modify-syntax-entry ?\\ "." st)
+    st))
+
+(defconst sed-commands ":=aiqQrRbcdDhHgGlnNpPstTwWxy")
+
+(eval-and-compile
+  (defconst sed-command-prefix-regexp "\\(?:^\\|[$/0-9;]\\)[ \t]*")
+  (defconst sed-address-prefix-regexp "\\(?:^\\|[,;]\\)[ \t]*"))
+
+(defconst sed-label-regexp "[[:alnum:]]+")
+
+(defun sed-syntax-propertize (beg end)
+  (goto-char beg)
+  (sed-syntax-propertize-string end)
+  (funcall
+   (syntax-propertize-rules
+    ("\\\\$"
+     (0 (unless (nth 8 (save-excursion (syntax-ppss (match-beginning 0))))
+          (put-text-property (match-beginning 0) (match-end 0)
+                             'syntax-table (string-to-syntax "|"))
+          (sed-syntax-propertize-string end)
+          nil)))
+    ((concat "\\(?:" sed-address-prefix-regexp
+             "\\(?:\\(?1:/\\)\\|\\\\\\(?1:.\\)\\)"
+             "\\|" sed-command-prefix-regexp "[sy]\\(?1:.\\)"
+             "\\)")
+     (0 (unless (nth 8 (save-excursion (syntax-ppss (match-beginning 0))))
+          (put-text-property (match-beginning 1) (match-end 1)
+                             'syntax-table (string-to-syntax "\""))
+          (sed-syntax-propertize-string end)
+          nil))))
+   (point) end))
+
+(defun sed-syntax-propertize-string (end)
+  (let* ((ppss (syntax-ppss))
+         (c (nth 3 ppss)))
+    (when c
+      (let ((count (cond
+                    ((or (eq c t)
+                         (not (memq (char-before (nth 8 ppss)) '(?s ?y))))
+                     1)
+                    (t 2))))
+        (goto-char (1+ (nth 8 ppss)))
+        (when (re-search-forward
+               (if (eq c t) "[^\\]\n" (regexp-quote (string c)))
+               end 'move count)
+          (put-text-property (1- (match-end 0)) (match-end 0)
+                             'syntax-table
+                             (if (eq c t) (string-to-syntax "|")
+                               (string-to-syntax "\""))))))))
+
+(defun sed--font-lock-command (cmd)
+  (unless (nth 8 (syntax-ppss))
+    (pcase cmd
+      (?: (if (looking-at (concat "[ 	]*\\(" sed-label-regexp "\\)"))
+              (put-text-property (match-beginning 1) (match-end 1) 'face
+                                 font-lock-function-name-face)))
+      ((or ?b ?t ?T)
+       (if (looking-at (concat "[ 	]*\\(" sed-label-regexp "\\)"))
+           (put-text-property (match-beginning 1) (match-end 1) 'face
+                              font-lock-constant-face))))
+    font-lock-keyword-face))
+
+(defconst sed-font-lock-keywords
+  `((,(concat sed-command-prefix-regexp "\\([" sed-commands "]\\)")
+     (1 (sed--font-lock-command (char-after (match-beginning 1)))))))
+
+(defconst sed-smie-grammar nil)
+
+(defun sed-smie-rules (kind token)
+  (pcase (cons kind token)
+    (`(:list-intro . ,_) t)
+    ))
+
+;;;###autoload (add-to-list 'auto-mode-alist '("\\.sed\\'" . sed-mode))
+
+;;;###autoload
+(define-derived-mode sed-mode prog-mode "Sed"
+  "Sed editing mode."
+  ;; (setq-local font-lock-support-mode nil) ;; To help debugging.
+  (setq-local comment-start "# ")
+  (setq-local comment-end "")
+  (setq-local parse-sexp-lookup-properties t)
+  (setq-local open-paren-in-column-0-is-defun-start nil)
+  (setq-local syntax-propertize-function #'sed-syntax-propertize)
+  (setq-local font-lock-defaults '(sed-font-lock-keywords))
+  (smie-setup sed-smie-grammar #'sed-smie-rules
+              ;; :backward-token #'sm-c-smie-backward-token
+              ;; :forward-token #'sm-c-smie-forward-token
+              )
+  ;; Backslash auto-realign.
+  ;; (add-hook 'after-change-functions #'sm-c--bs-after-change nil t)
+  ;; (add-hook 'post-command-hook #'sm-c--bs-realign nil t)
+  ;; (setq-local add-log-current-defun-header-regexp sm-c--def-regexp)
+  ;; (setq-local imenu-generic-expression `((nil ,sm-c--def-regexp 1)))
+  )
+
+(provide 'sed-mode)
+;;; sed-mode.el ends here
-- 
2.39.2