Add gph major-mode file for emacs. - geomyidae - A small C-based gopherd.

git clone git://bitreich.org/geomyidae/ git://enlrupgkhuxnvlhsf6lc3fziv5h2hhfrinws65d7roiv6bfj7d652fid.onion/geomyidae/

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commit 9f6992fbf205ebf60a0674c9ec29a86c73cb4fa9

parent b8f2f9e71128445ed61141bb7eec1d241790fb43

Author: Christoph Lohmann <20h@r-36.net>

Date:   Wed,  3 Aug 2022 18:24:55 +0200

Add gph major-mode file for emacs.

Thanks Athas!

Diffstat:
  M gph/README.md                       |       6 ++++++
  A gph/emacs/gph-mode.el               |      61 +++++++++++++++++++++++++++++++

2 files changed, 67 insertions(+), 0 deletions(-)
---

diff --git a/gph/README.md b/gph/README.md

@@ -9,3 +9,9 @@
         cp vim/ftdetect/gph.vim ~/.vim/ftdetect
         cp vim/syntax/gph.vim ~/.vim/syntax
 
+## emacs
+
+Please read this on how emacs finds its major mode files:
+
+        https://www.gnu.org/software/emacs/manual/html_node/elisp/Auto-Major-Mode.html
+

diff --git a/gph/emacs/gph-mode.el b/gph/emacs/gph-mode.el

@@ -0,0 +1,61 @@
+;;; gph-mode.el --- major mode for gph files  -*- lexical-binding: t; -*-
+
+;; Copyright (C) Troels Henriksen (athas@sigkill.dk) 2022
+;;
+;; URL: https://github.com/diku-dk/futhark-mode
+;; Keywords: gopher
+;; Version: 1.0
+;; Package-Requires: ((emacs "25.1"))
+
+;; This file is not part of GNU Emacs.
+
+;;; License:
+;; GPL-3+
+
+;;; Commentary:
+;; .gph is the map file format used by the geomyidae Gopher daemon.
+;; This Emacs mode provides basic understanding of the link syntax,
+;; such that highlighting and folding works properly.
+;;
+;; Files with the ".gph" extension are automatically handled by this mode.
+;;
+;; For extensions: Define local keybindings in `gph-mode-map'.  Add
+;; startup functions to `gph-mode-hook'.
+
+;;; Code:
+
+(eval-when-compile
+  (require 'rx))
+
+(defvar gph--font-lock-defaults
+  (let* ((type-rx '(or "0" "1" "3" "7" "8" "9" "g" "I" "h" "i"))
+         (desc-rx '(* (not "|")))
+         (path-rx '(* (not "|")))
+         (host-rx '(* (not "|")))
+         (port-rx '(+ digit))
+         (link-rx `(: line-start "[" ,type-rx "|" ,desc-rx "|" ,path-rx "|" ,host-rx "|" ,port-rx "]"))
+         (badlink-rx `(: line-start "[" (* anything))))
+    `((,(rx-to-string link-rx) 0 font-lock-doc-markup-face)
+      (,(rx-to-string badlink-rx) 0 font-lock-warning-face))))
+
+(defvar gph-mode-hook nil
+  "Hook for `gph-mode'.  Is run whenever the mode is entered.")
+
+(defvar gph-mode-map
+  (let ((map (make-keymap)))
+    map)
+  "Keymap for `gph-mode'.")
+
+;;;###autoload
+(add-to-list 'auto-mode-alist '("\\.gph" . gph-mode))
+
+;;;###autoload
+(define-derived-mode gph-mode text-mode "gph"
+  "Major mode for .gph files as used by geomyidae."
+  (setq-local paragraph-start (concat "^\\[|\\|[ \t]*$\\|" page-delimiter))
+  (setq-local paragraph-separate (concat "^\\[\\|[ \t]*$\\|" page-delimiter))
+  (setq-local font-lock-defaults '(gph--font-lock-defaults)))
+
+(provide 'gph-mode)
+
+;;; gph-mode.el ends here