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37 lines
1.1 KiB
37 lines
1.1 KiB
;;; nix-format.el --- Nix formatter -*- lexical-binding: t -*-
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;; This file is NOT part of GNU Emacs.
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;; Version: 1.4.0
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;;; Commentary:
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;;; Code:
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(defcustom nix-nixfmt-bin "nixfmt"
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"Path to nixfmt executable."
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:group 'nix
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:type 'string)
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(defun nix--format-call (buf)
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"Format BUF using nixfmt."
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(with-current-buffer (get-buffer-create "*nixfmt*")
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(erase-buffer)
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(insert-buffer-substring buf)
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(if (zerop (call-process-region (point-min) (point-max) nix-nixfmt-bin t t nil))
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(progn
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(if (not (string= (buffer-string) (with-current-buffer buf (buffer-string))))
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(copy-to-buffer buf (point-min) (point-max)))
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(kill-buffer))
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(error "Nixfmt failed, see *nixfmt* buffer for details"))))
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(defun nix-format-buffer ()
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"Format the current buffer using nixfmt."
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(interactive)
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(unless (executable-find nix-nixfmt-bin)
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(error "Could not locate executable \"%s\"" nix-nixfmt-bin))
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(nix--format-call (current-buffer))
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(message "Formatted buffer with nixfmt."))
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(provide 'nix-format)
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;;; nix-format.el ends here
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