• Syntax Highlighting
• Comment syntax
• Auto-completion (TODO)

• Load the notepad-convert.el file
• Set up your config file as follows

 (setq xml-file <source>)
  (setq base-table <syntax-table>)
  (setq comment-string <comment delimiter>)
  (setq base-mode <mode>)

The base table is the syntax table for the most similar language which emacs supports. The table for a given language is usually named '<language>-mode-syntax-table

For instance if the XML file is for the Groovy language, which is similar to Java, then the file would look like:

(setq xml-file "~/files/groovy,xml")
(setq base-table 'java-mode-syntax-table)
(setq comment-string "//")
(setq base-mode 'java-mode)

(NOTE: The quotes before variable names are important)

• Call the function notepadxml-convert using M-x notepadxml-convert
• When prompted, enter the path of the config file you defined above
• When prompted, choose the path for the resulting mode definition file (make sure it's somewhere in your load-path)
• Note the filename, and require that in your .emacs file. For instance, with the above example you would add (require 'groovy-mode)

In the user config file, you can define a variable called conversion. It takes the form of an associative list where the car is the name of the XML attribute containing those words, and the cdr is the font-lock face to be used. You may redefine them as you choose, based on the language.

The program uses radix-trees to generate arbitrary company backends. The main conversion process notepadxml-convert also outputs a radix file to ~/.emacs.d/notepad/<modename>-radix.el. To have the backend be set up whenever the mode is activated, add the following to your .emacs file.

(require 'auto-gen-backend)
(add-hook '<lang>-mode-hook (auto-gen-backend lang))

Source I ripped most of the functions from: https://justinhj.github.io/2018/10/24/radix-trees-dash-and-company-mode.html