Shell script formatting and linting with shfmt

Install shfmt per instructions.

shfmt.el is not (yet) on MELPA so install it locally however you like. You will have to install reformatter and flycheck separately.

Manual formatting requires no configuration; just call shfmt-buffer or shfmt-region. Enable shfmt-on-save-mode to auto-format on save. Add this to the sh-mode-hook to enable automatically in new buffers.

Call flycheck-shfmt-setup to enable the Flycheck checker.

Using use-package, assuming installed locally to lisp/shfmt:

(use-package shfmt
  :ensure nil
  :load-path "lisp/shfmt"
  :ensure-system-package shfmt
  :hook (sh-mode . shfmt-on-save-mode))

(use-package flycheck-shfmt
  :ensure nil
  :after flycheck
  :load-path "lisp/shfmt"
  :config
  (flycheck-shfmt-setup))

GPL-3