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Known to work with Emacs 24 and later

If you just want to use it, you can get it via MELPA.

A Dockerfile mode for emacs

(add-to-list 'load-path "/your/path/to/dockerfile-mode/")
(require 'dockerfile-mode)
(add-to-list 'auto-mode-alist '("Dockerfile\\'" . dockerfile-mode))

Adds syntax highlighting as well as the ability to build the image directly (C-c C-b) from the buffer.

You can specify the image name in the file itself by adding a line like this at the top of your Dockerfile.

## -*- docker-image-name: "your-image-name-here" -*-

If you don't, you'll be prompted for an image name each time you build. You may want to add the following to your emacs config:

(put 'dockerfile-image-name 'safe-local-variable #'stringp)

You can change the binary to use with

(setq dockerfile-mode-command "docker")
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