From 3797f203aff0f28a9d97cbe68d6d43bdbd91b794 Mon Sep 17 00:00:00 2001
From: Iain Bethune <iain.bethune@stfc.ac.uk>
Date: Mon, 27 Jan 2014 09:35:03 +0000
Subject: [PATCH] Added folding/unfolding to emacs edit mode (Lianheng Tong)

svn-origin-rev: 13499
---
 tools/input_editing/emacs/README       | 23 ++++++++++++++++-------
 tools/input_editing/emacs/cp2k-mode.el | 12 +++++++++++-
 2 files changed, 27 insertions(+), 8 deletions(-)

diff --git a/tools/input_editing/emacs/README b/tools/input_editing/emacs/README
index ac683481da..115f203f34 100644
--- a/tools/input_editing/emacs/README
+++ b/tools/input_editing/emacs/README
@@ -4,7 +4,7 @@
 #+author: Lianheng Tong
 #+date: Wednesday, 2014/01/22
 
-cp2k-mode.el is provides a major mode in emacs for editing CP2K input
+cp2k-mode.el provides a major mode in emacs for editing CP2K input
 files. It has been tested on emacs 2.1, 2.3 and 2.4.
 
 * Functionalities
@@ -14,6 +14,13 @@ files. It has been tested on emacs 2.1, 2.3 and 2.4.
     - the keywords
     - the comment lines
   - Indents lines according to the CP2K input syntax using <tab> key
+  - Input sections can be folded or unfolded, using emacs outline
+    minor mode.
+    - outline-toggle-children when called on a unfolded section, folds
+      the section recursively; when called on a folded section,
+      unfolds the top level tree.
+    - show-all when called unfolds all sections recursively.
+    - show-subtree when called unfolds a folded section recursively.
   - New interactive functions:
     - cp2k-indent-line:        indents the line according to CP2K 
                                input syntax.
@@ -22,12 +29,14 @@ files. It has been tested on emacs 2.1, 2.3 and 2.4.
     - cp2k-end-of-block:       goes to the ending of the subsection,
                                marks the current cursor position.
   - Key Bindings:
-    - <tab>   cp2k-indent-line
-    - C-j     newline-and-indent
-    - C-c ;   comment-region
-    - C-M-a   cp2k-beginning-of-block
-    - C-M-e   cp2k-end-of-block
-
+    - <tab>    cp2k-indent-line
+    - C-j      newline-and-indent
+    - C-c ;    comment-region
+    - C-M-a    cp2k-beginning-of-block
+    - C-M-e    cp2k-end-of-block
+    - C-c C-c  outline-toggle-children
+    - C-c C-a  show-all
+    - C-c C-t  show-subtree
 * Installation
   You need to put cp2k-mode.el in one of your local emacs lisp
   directories, which is in the search path of your emacs installation.
diff --git a/tools/input_editing/emacs/cp2k-mode.el b/tools/input_editing/emacs/cp2k-mode.el
index 724792c314..c562726839 100644
--- a/tools/input_editing/emacs/cp2k-mode.el
+++ b/tools/input_editing/emacs/cp2k-mode.el
@@ -1,6 +1,6 @@
 ;;;;; Emacs major mode for cp2k input, written by Lianheng Tong
 ;;;;; Copyright (c) Lianheng Tong
-;;;;; Last modify date: Thursday, 2013/12/05
+;;;;; Last modify date: Saturday, 2014/01/25
 
 ;;;; Syntax highlighting of keywords
 (defconst cp2k-font-lock-keywords
@@ -49,6 +49,9 @@
     (define-key map (kbd "TAB")     'cp2k-indent-line)
     (define-key map (kbd "C-M-a")   'cp2k-beginning-of-block)
     (define-key map (kbd "C-M-e")   'cp2k-end-of-block)
+    (define-key map (kbd "C-c C-c") 'outline-toggle-children)
+    (define-key map (kbd "C-c C-a") 'show-all)
+    (define-key map (kbd "C-c C-t") 'show-subtree)
     map)
   "Keymap for `cp2k-mode'.")
 
@@ -239,5 +242,12 @@
 ;;;; Add to autoload alist
 (add-to-list 'auto-mode-alist '("\\.cp2kin\\'" . cp2k-mode))
 
+;;;; Setup outline mode
+(when (require 'outline nil 'noerror)
+  (add-hook 'cp2k-mode-hook 'outline-minor-mode)
+  ;; in outline mode, the level of header depends on the length of
+  ;; match, which suits our purposes quite well
+  (setq outline-regexp "[ \t]*\\(&\\|@\\(IF\\|EN\\)\\)"))
+
 ;;;; Last line
 (provide 'cp2k-mode)