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Install Crystal by following the instructions available in https://crystal-lang.org/install/
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Install Ameba to get Lint suggestions to Crystal code
git clone https://github.com/crystal-ameba/ameba && cd ameba make install
Add Melpa packages repository details to .emacs file if not added already.
(require 'package)
(add-to-list 'package-archives '("melpa" . "https://melpa.org/packages/") t)
;; Comment/uncomment this line to enable MELPA Stable if desired. See `package-archive-priorities`
;; and `package-pinned-packages`. Most users will not need or want to do this.
;;(add-to-list 'package-archives '("melpa-stable" . "https://stable.melpa.org/packages/") t)
(package-initialize)Install the following packages by running M-x list-packages
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crystal-mode - For syntax highlight
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ameba - Linter
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flycheck-crystal - On the fly check errors
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exec-path-from-shell - To load env vars from shell
Add below code to fetch env variables from the shell
;; Set PATH and other env vars
(setq exec-path-from-shell-check-startup-files nil)
(exec-path-from-shell-initialize)Now enable the flycheck and ameba mode by adding the following in ~/.emacs file.
(require 'flycheck-crystal)
(add-hook 'crystal-mode-hook 'flycheck-mode)
(add-hook 'crystal-mode-hook 'ameba-mode)Thats all! now Emacs starts highlighting the syntax errors on the fly. Check ameba errors by running M-x ameba-check-current-file when required.