forked from lix-project/lix
eca29bd72d
Emacs 24.1 introduced the notion of "basic major modes" and among these is prog-mode, see section "23.2.5 Basic Major Modes" in the Emacs manual. The prog-mode basic major mode is recommended as a base for derived major modes that are intended for editing source code.
96 lines
3 KiB
EmacsLisp
96 lines
3 KiB
EmacsLisp
;;; nix-mode.el --- Major mode for editing Nix expressions
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;; Author: Eelco Dolstra
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;; URL: https://github.com/NixOS/nix/tree/master/misc/emacs
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;; Version: 1.0
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;;; Commentary:
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;;; Code:
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(defconst nix-font-lock-keywords
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'("\\<if\\>" "\\<then\\>" "\\<else\\>" "\\<assert\\>" "\\<with\\>"
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"\\<let\\>" "\\<in\\>" "\\<rec\\>" "\\<inherit\\>" "\\<or\\>"
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("\\<true\\>" . font-lock-builtin-face)
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("\\<false\\>" . font-lock-builtin-face)
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("\\<null\\>" . font-lock-builtin-face)
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("\\<import\\>" . font-lock-builtin-face)
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("\\<derivation\\>" . font-lock-builtin-face)
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("\\<baseNameOf\\>" . font-lock-builtin-face)
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("\\<toString\\>" . font-lock-builtin-face)
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("\\<isNull\\>" . font-lock-builtin-face)
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("[a-zA-Z][a-zA-Z0-9\\+-\\.]*:[a-zA-Z0-9%/\\?:@&=\\+\\$,_\\.!~\\*'-]+"
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. font-lock-constant-face)
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("\\<\\([a-zA-Z_][a-zA-Z0-9_'\-\.]*\\)[ \t]*="
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(1 font-lock-variable-name-face nil nil))
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("<[a-zA-Z0-9._\\+-]+\\(/[a-zA-Z0-9._\\+-]+\\)*>"
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. font-lock-constant-face)
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("[a-zA-Z0-9._\\+-]*\\(/[a-zA-Z0-9._\\+-]+\\)+"
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. font-lock-constant-face))
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"Font lock keywords for nix.")
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(defvar nix-mode-syntax-table
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(let ((table (make-syntax-table)))
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(modify-syntax-entry ?/ ". 14" table)
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(modify-syntax-entry ?* ". 23" table)
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(modify-syntax-entry ?# "< b" table)
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(modify-syntax-entry ?\n "> b" table)
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table)
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"Syntax table for Nix mode.")
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(defun nix-indent-line ()
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"Indent current line in a Nix expression."
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(interactive)
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(indent-relative-maybe))
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;;;###autoload
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(define-derived-mode nix-mode prog-mode "Nix"
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"Major mode for editing Nix expressions.
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The following commands may be useful:
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'\\[newline-and-indent]'
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Insert a newline and move the cursor to align with the previous
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non-empty line.
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'\\[fill-paragraph]'
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Refill a paragraph so that all lines are at most `fill-column'
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lines long. This should do the right thing for comments beginning
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with `#'. However, this command doesn't work properly yet if the
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comment is adjacent to code (i.e., no intervening empty lines).
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In that case, select the text to be refilled and use
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`\\[fill-region]' instead.
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The hook `nix-mode-hook' is run when Nix mode is started.
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\\{nix-mode-map}
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"
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(set-syntax-table nix-mode-syntax-table)
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;; Font lock support.
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(setq font-lock-defaults '(nix-font-lock-keywords nil nil nil nil))
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;; Automatic indentation [C-j].
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(set (make-local-variable 'indent-line-function) 'nix-indent-line)
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;; Indenting of comments.
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(set (make-local-variable 'comment-start) "# ")
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(set (make-local-variable 'comment-end) "")
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(set (make-local-variable 'comment-start-skip) "\\(^\\|\\s-\\);?#+ *")
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;; Filling of comments.
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(set (make-local-variable 'adaptive-fill-mode) t)
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(set (make-local-variable 'paragraph-start) "[ \t]*\\(#+[ \t]*\\)?$")
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(set (make-local-variable 'paragraph-separate) paragraph-start))
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;;;###autoload
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(progn
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(add-to-list 'auto-mode-alist '("\\.nix\\'" . nix-mode))
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(add-to-list 'auto-mode-alist '("\\.nix.in\\'" . nix-mode)))
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(provide 'nix-mode)
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;;; nix-mode.el ends here
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