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1008 rader
35 KiB
;;; nix-mode.el --- Major mode for editing .nix files -*- lexical-binding: t -*-
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;; Maintainer: Matthew Bauer <mjbauer95@gmail.com>
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;; Homepage: https://github.com/NixOS/nix-mode
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;; Version: 1.4.1
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;; Keywords: nix, languages, tools, unix
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;; Package-Requires: ((emacs "25"))
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;; This file is NOT part of GNU Emacs.
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;;; Commentary:
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;; A major mode for editing Nix expressions (.nix files). See the Nix manual
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;; for more information available at https://nixos.org/nix/manual/.
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;;; Code:
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(require 'nix)
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(require 'nix-format)
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(require 'nix-shebang)
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(require 'nix-shell)
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(require 'nix-repl)
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(require 'smie)
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(require 'ffap)
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(eval-when-compile (require 'subr-x))
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(defgroup nix-mode nil
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"Nix mode customizations"
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:group 'nix)
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(defcustom nix-indent-function 'smie-indent-line
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"The function to use to indent.
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Valid functions for this are:
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- ‘indent-relative’
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- ‘nix-indent-line' (buggy)
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- `smie-indent-line' (‘nix-mode-use-smie’ must be enabled)"
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:group 'nix-mode
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:type 'function)
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(defcustom nix-mode-use-smie t
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"Whether to use SMIE when editing Nix files.
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This is enabled by default, but can take a while to load with
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very large Nix files (all-packages.nix)."
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:group 'nix-mode
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:type 'boolean)
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(defgroup nix-faces nil
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"Nix faces."
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:group 'nix-mode
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:group 'faces)
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(defface nix-keyword-face
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'((t :inherit font-lock-keyword-face))
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"Face used to highlight Nix keywords."
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:group 'nix-faces)
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(defface nix-keyword-warning-face
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'((t :inherit font-lock-warning-face))
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"Face used to highlight Nix warning keywords."
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:group 'nix-faces)
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(defface nix-builtin-face
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'((t :inherit font-lock-builtin-face))
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"Face used to highlight Nix builtins."
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:group 'nix-faces)
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(defface nix-constant-face
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'((t :inherit font-lock-constant-face))
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"Face used to highlight Nix constants."
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:group 'nix-faces)
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(defface nix-attribute-face
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'((t :inherit font-lock-variable-name-face))
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"Face used to highlight Nix attributes."
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:group 'nix-faces)
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(defface nix-antiquote-face
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'((t :inherit font-lock-preprocessor-face))
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"Face used to highlight Nix antiquotes."
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:group 'nix-faces)
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;;; Constants
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(defconst nix-system-types
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'("x86_64-linux" "i686-linux" "aarch64-linux" "x86_64-darwin")
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"List of supported systems.")
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(defconst nix-keywords
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'("if" "then"
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"else" "with"
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"let" "in"
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"rec" "inherit"
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"or"))
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(defconst nix-builtins
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'("builtins" "baseNameOf"
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"derivation" "dirOf"
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"true" "false" "null"
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"isNull" "toString"
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"fetchTarball" "import"
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"map" "removeAttrs"))
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(defconst nix-warning-keywords
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'("assert" "abort" "throw"))
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;;; Regexps
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(defconst nix-re-file-path
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"[a-zA-Z0-9._\\+-]*\\(/[a-zA-Z0-9._\\+-]+\\)+")
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(defconst nix-re-url
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"[a-zA-Z][a-zA-Z0-9\\+-\\.]*:[a-zA-Z0-9%/\\?:@&=\\+\\$,_\\.!~\\*'-]+")
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(defconst nix-re-bracket-path
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"<[a-zA-Z0-9._\\+-]+\\(/[a-zA-Z0-9._\\+-]+\\)*>")
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(defconst nix-re-variable-assign
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"\\<\\([a-zA-Z_][a-zA-Z0-9_'\-\.]*\\)[ \t]*=[^=]")
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(defconst nix-re-caps
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" =[ \n]\\|\(\\|\{\\|\\[\\|\\bwith\\b\\|\\blet\\b\\|\\binherit\\b")
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(defconst nix-re-ends ";\\|\)\\|\\]\\|\}\\|\\bin\\b")
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(defconst nix-re-quotes "''\\|\"")
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(defconst nix-re-comments "#\\|/*\\|*/")
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(defun nix-re-keywords (keywords)
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"Produce a regexp matching some keywords of Nix.
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KEYWORDS a list of strings to match as Nix keywords."
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(concat
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"\\(?:[[:space:];:{}()]\\|^\\)"
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(regexp-opt keywords t)
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"\\(?:[[:space:];:{}()]\\|$\\)"
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))
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(defconst nix-font-lock-keywords
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`((,(nix-re-keywords nix-keywords) 1 'nix-keyword-face)
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(,(nix-re-keywords nix-warning-keywords) 1 'nix-keyword-warning-face)
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(,(nix-re-keywords nix-builtins) 1 'nix-builtin-face)
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(,nix-re-url 0 'nix-constant-face)
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(,nix-re-file-path 0 'nix-constant-face)
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(,nix-re-variable-assign 1 'nix-attribute-face)
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(,nix-re-bracket-path 0 'nix-constant-face)
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(nix--syntax-match-antiquote 0 'nix-antiquote-face t))
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"Font lock keywords for nix.")
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(defconst nix--variable-char "[a-zA-Z0-9_'\-]")
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(defvar nix-mode-abbrev-table
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(make-abbrev-table)
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"Abbrev table for Nix mode.")
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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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(modify-syntax-entry ?_ "_" table)
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(modify-syntax-entry ?. "'" table)
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(modify-syntax-entry ?- "_" table)
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(modify-syntax-entry ?' "'" table)
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(modify-syntax-entry ?= "." table)
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(modify-syntax-entry ?< "." table)
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(modify-syntax-entry ?> "." table)
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;; We handle strings
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(modify-syntax-entry ?\" "." table)
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;; We handle escapes
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(modify-syntax-entry ?\\ "." table)
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table)
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"Syntax table for Nix mode.")
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(defun nix--syntax-match-antiquote (limit)
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"Find antiquote within a Nix expression up to LIMIT."
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(unless (> (point) limit)
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(if (get-text-property (point) 'nix-syntax-antiquote)
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(progn
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(set-match-data (list (point) (1+ (point))))
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(forward-char 1)
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t)
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(let ((pos (next-single-char-property-change (point) 'nix-syntax-antiquote
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nil limit)))
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(when (and pos (not (> pos limit)))
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(goto-char pos)
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(let ((char (char-after pos)))
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(pcase char
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(`?{
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(forward-char 1)
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(set-match-data (list (1- pos) (point)))
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t)
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(`?}
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(forward-char 1)
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(set-match-data (list pos (point)))
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t))))))))
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(defun nix--mark-string (pos string-type)
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"Mark string as a Nix string.
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POS position of start of string
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STRING-TYPE type of string based off of Emacs syntax table types"
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(put-text-property pos (1+ pos)
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'syntax-table (string-to-syntax "|"))
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(put-text-property pos (1+ pos)
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'nix-string-type string-type))
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(defun nix--get-parse-state (pos)
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"Get the result of `syntax-ppss' at POS."
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(save-excursion (save-match-data (syntax-ppss pos))))
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(defun nix--get-string-type (parse-state)
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"Get the type of string based on PARSE-STATE."
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(let ((string-start (nth 8 parse-state)))
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(and string-start (get-text-property string-start 'nix-string-type))))
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(defun nix--open-brace-string-type (parse-state)
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"Determine if this is an open brace string type based on PARSE-STATE."
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(let ((open-brace (nth 1 parse-state)))
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(and open-brace (get-text-property open-brace 'nix-string-type))))
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(defun nix--open-brace-antiquote-p (parse-state)
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"Determine if this is an open brace antiquote based on PARSE-STATE."
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(let ((open-brace (nth 1 parse-state)))
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(and open-brace (get-text-property open-brace 'nix-syntax-antiquote))))
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(defun nix--single-quotes ()
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"Handle Nix single quotes."
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(let* ((start (match-beginning 0))
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(end (match-end 0))
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(context (nix--get-parse-state start))
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(string-type (nix--get-string-type context)))
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(unless (or (equal string-type ?\")
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(and (equal string-type nil)
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(< 1 start)
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(string-match-p nix--variable-char
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(buffer-substring (1- start) start))))
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(when (equal string-type nil)
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(nix--mark-string start ?\')
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(setq start (+ 2 start)))
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(when (equal (mod (- end start) 3) 2)
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(let ((str-peek (buffer-substring end (min (point-max) (+ 2 end)))))
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(if (member str-peek '("${" "\\n" "\\r" "\\t"))
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(goto-char (+ 2 end))
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(nix--mark-string (1- end) ?\')))))))
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(defun nix--escaped-antiquote-dq-style ()
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"Handle Nix escaped antiquote dq style."
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(let* ((start (match-beginning 0))
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(ps (nix--get-parse-state start))
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(string-type (nix--get-string-type ps)))
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(when (equal string-type ?\')
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(nix--antiquote-open-at (1+ start) ?\'))))
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(defun nix--double-quotes ()
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"Handle Nix double quotes."
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(let* ((pos (match-beginning 0))
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(ps (nix--get-parse-state pos))
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(string-type (nix--get-string-type ps)))
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(unless (equal string-type ?\')
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(nix--mark-string pos ?\"))))
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(defun nix--antiquote-open-at (pos string-type)
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"Handle Nix antiquote open at based on POS and STRING-TYPE."
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(put-text-property pos (1+ pos)
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'syntax-table (string-to-syntax "|"))
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(put-text-property pos (+ 2 pos)
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'nix-string-type string-type)
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(put-text-property (1+ pos) (+ 2 pos)
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'nix-syntax-antiquote t))
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(defun nix--antiquote-open ()
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"Handle Nix antiquote open."
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(let* ((start (match-beginning 0))
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(ps (nix--get-parse-state start))
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(string-type (nix--get-string-type ps)))
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(when string-type
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(nix--antiquote-open-at start string-type))))
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(defun nix--antiquote-close-open ()
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"Handle Nix antiquote close then open."
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(let* ((start (match-beginning 0))
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(ps (nix--get-parse-state start))
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(string-type (nix--get-string-type ps)))
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(if string-type
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(nix--antiquote-open-at (1+ start) string-type)
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(when (nix--open-brace-antiquote-p ps)
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(let ((string-type (nix--open-brace-string-type ps)))
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(put-text-property start (+ 3 start)
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'nix-string-type string-type)
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(put-text-property start (1+ start)
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'nix-syntax-antiquote t)
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(put-text-property (+ 2 start) (+ 3 start)
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'nix-syntax-antiquote t))))))
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(defun nix--antiquote-close ()
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"Handle Nix antiquote close."
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(let* ((start (match-beginning 0))
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(ps (nix--get-parse-state start)))
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(unless (nix--get-string-type ps)
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(let ((string-type (nix--open-brace-string-type ps)))
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(when string-type
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(put-text-property start (1+ start)
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'nix-string-type string-type)
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(put-text-property start (1+ start)
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'nix-syntax-antiquote t)
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(let ((ahead (buffer-substring (1+ start)
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(min (point-max) (+ 5 start)))))
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(pcase string-type
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(`?\" (cond
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((or (string-match "^\\\\\"" ahead)
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(string-match "^\\\\\\${" ahead))
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(nix--mark-string (1+ start) string-type)
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(goto-char (+ start (match-end 0) 1)))
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((string-match-p "^\"" ahead)
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(goto-char (+ 2 start)))
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((< (1+ start) (point-max))
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(nix--mark-string (1+ start) string-type)
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(goto-char (+ 2 start)))))
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(`?\' (cond
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((or (string-match "^'''" ahead)
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(string-match "^''\\${" ahead)
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(string-match "^''\\\\[nrt]" ahead))
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(nix--mark-string (1+ start) string-type)
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(goto-char (+ start (match-end 0) 1)))
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((string-match-p "^''" ahead)
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(goto-char (+ 3 start)))
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((< (1+ start) (point-max))
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(nix--mark-string (1+ start) string-type)
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(goto-char (+ 2 start))))))))))))
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(defun nix-syntax-propertize (start end)
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"Special syntax properties for Nix from START to END."
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(goto-char start)
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(remove-text-properties start end
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'(nix-string-type nil nix-syntax-antiquote nil))
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(funcall
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(syntax-propertize-rules
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("\\\\\\\\"
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(0 nil))
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("\\\\\""
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(0 nil))
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("\\\\\\${"
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(0 (ignore (nix--escaped-antiquote-dq-style))))
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("'\\{2,\\}"
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(0 (ignore (nix--single-quotes))))
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("}\\${"
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(0 (ignore (nix--antiquote-close-open))))
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("\\${"
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(0 (ignore (nix--antiquote-open))))
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("}"
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(0 (ignore (nix--antiquote-close))))
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("\""
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(0 (ignore (nix--double-quotes)))))
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start end))
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;; Indentation using SMIE
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(defconst nix-smie-grammar
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(smie-prec2->grammar
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(smie-merge-prec2s
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(smie-bnf->prec2
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'((id)
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(expr (arg ":" expr)
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("if" expr "then" expr "else" expr)
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("let" decls "in" expr)
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("with" expr "nonsep-;" expr)
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("assert" expr "nonsep-;" expr)
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(attrset)
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(id))
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(attrset ("{" decls "}"))
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(decls (decls ";" decls)
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(id "=" expr))
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(arg (id) ("{" args "}"))
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(args (args "," args) (id "arg-?" expr)))
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'((assoc ";"))
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'((assoc ","))
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;; resolve "(with foo; a) <op> b" vs "with foo; (a <op> b)"
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;; in favor of the latter.
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'((nonassoc "nonsep-;") (nonassoc " -dummy- "))
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;; resolve "(if ... then ... else a) <op> b"
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;; vs "if ... then ... else (a <op> b)" in favor of the latter.
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'((nonassoc "in") (nonassoc " -dummy- ")))
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(smie-precs->prec2
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'((nonassoc " -dummy- ")
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(nonassoc "=")
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;; " -bexpskip- " and " -fexpskip- " are handy tokens for skipping over
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;; whole expressions.
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;; For instance, suppose we have a line looking like this:
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;; "{ foo.bar // { x = y }"
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;; and point is at the end of the line. We can skip the whole
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;; expression (i.e. so the point is just before "foo") using
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;; `(smie-backward-sexp " -bexpskip- ")'. `(backward-sexp)' would
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;; skip over "{ x = y }", not over the whole expression.
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(right " -bexpskip- ")
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(left " -fexpskip- ")
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(nonassoc "else")
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(right ":")
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(right "->")
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(assoc "||")
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(assoc "&&")
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(nonassoc "==" "!=")
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(nonassoc "<" "<=" ">" ">=")
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(left "//")
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(nonassoc "!")
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(assoc "-" "+")
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(assoc "*" "/")
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(assoc "++")
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(left "?")
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;; Tokens for skipping sequences of sexps
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;; (i.e. identifiers or balanced parens).
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;; For instance, suppose we have a line looking like this:
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;; "{ foo.bar // f x "
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;; and point is at the end of the line. We can skip the "f x"
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;; part by doing `(smie-backward-sexp " -bseqskip- ")'.
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(right " -bseqskip- ")
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(left " -fseqskip- "))))))
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(defconst nix-smie--symbol-chars ":->|&=!</-+*?,;!")
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(defconst nix-smie--infix-symbols-re
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(regexp-opt '(":" "->" "||" "&&" "==" "!=" "<" "<=" ">" ">="
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"//" "-" "+" "*" "/" "++" "?")))
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(defconst nix-smie-indent-tokens-re
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(regexp-opt '("{" "(" "[" "=" "let" "if" "then" "else")))
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;; The core indentation algorithm is very simple:
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;; - If the last token on the previous line matches `nix-smie-indent-tokens-re',
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;; then the current line is indented by `tab-width' relative to the
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;; previous line's 'anchor'.
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;; - Otherwise, let SMIE handle it.
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;; The 'anchor' of a line is defined as follows:
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;; - If the line contains an assignment, it is the beginning of the
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;; left-hand side of the first assignment on that line.
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;; - Otherwise, it is the position of the first token on that line.
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(defun nix-smie-rules (kind token)
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"Core smie rules."
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(pcase (cons kind token)
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(`(:after . ,(guard (string-match-p nix-smie-indent-tokens-re
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token)))
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(nix-smie--indent-anchor))
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(`(,_ . "in")
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(let ((bol (line-beginning-position)))
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(forward-word)
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;; Go back to the corresponding "let".
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(smie-backward-sexp t)
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(pcase kind
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(:before
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(if (smie-rule-hanging-p)
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(nix-smie--indent-anchor 0)
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`(column . ,(current-column))))
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(:after
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|
(cond
|
|
((bolp) '(column . 0))
|
|
((<= bol (point))
|
|
`(column . ,(current-column))))))))
|
|
(`(:after . "nonsep-;")
|
|
(forward-char)
|
|
(backward-sexp)
|
|
(if (smie-rule-bolp)
|
|
`(column . ,(current-column))
|
|
(nix-smie--indent-anchor)))
|
|
(`(:after . ":")
|
|
(or (nix-smie--indent-args-line)
|
|
(nix-smie--indent-anchor)))
|
|
(`(:after . ",")
|
|
(smie-rule-parent tab-width))
|
|
(`(:before . ",")
|
|
;; The parent is either the enclosing "{" or some previous ",".
|
|
;; In both cases this is what we want to align to.
|
|
(smie-rule-parent))
|
|
(`(:before . "if")
|
|
(let ((bol (line-beginning-position)))
|
|
(save-excursion
|
|
(and
|
|
(equal (nix-smie--backward-token) "else")
|
|
(<= bol (point))
|
|
`(column . ,(current-column))))))
|
|
(`(:before . ,(guard (string-match-p nix-smie--infix-symbols-re token)))
|
|
(forward-comment (- (point)))
|
|
(let ((bol (line-beginning-position)))
|
|
(smie-backward-sexp token)
|
|
(if (< (point) bol)
|
|
(nix-smie--indent-anchor 0))))))
|
|
|
|
(defun nix-smie--anchor ()
|
|
"Return the anchor's offset from the beginning of the current line."
|
|
(save-excursion
|
|
(beginning-of-line)
|
|
(let ((eol (line-end-position))
|
|
anchor
|
|
tok)
|
|
(forward-comment (point-max))
|
|
(unless (or (eobp) (< eol (point)))
|
|
(setq anchor (current-column))
|
|
(catch 'break
|
|
(while (and (not (eobp))
|
|
(progn
|
|
(setq tok (car (smie-indent-forward-token)))
|
|
(<= (point) eol)))
|
|
(when (equal "=" tok)
|
|
(backward-char)
|
|
(smie-backward-sexp " -bseqskip- ")
|
|
(setq anchor (current-column))
|
|
(throw 'break nil))))
|
|
anchor))))
|
|
|
|
(defun nix-smie--indent-anchor (&optional indent)
|
|
"Intended for use only in the rules function."
|
|
(let ((indent (or indent tab-width)))
|
|
`(column . ,(+ indent (nix-smie--anchor)))))
|
|
|
|
(defun nix-smie--indent-args-line ()
|
|
"Indent the body of a lambda whose argument(s) are on a line of their own."
|
|
(save-excursion
|
|
;; Assume that point is right before ':', skip it
|
|
(forward-char)
|
|
(let ((tok ":"))
|
|
(catch 'break
|
|
(while (equal tok ":")
|
|
(setq tok (nth 2 (smie-backward-sexp t)))
|
|
(when (smie-rule-bolp)
|
|
(throw 'break `(column . ,(current-column)))))))))
|
|
|
|
(defconst nix-smie--path-chars "a-zA-Z0-9-+_.:/~")
|
|
|
|
(defun nix-smie--skip-angle-path-forward ()
|
|
"Skip forward a path enclosed in angle brackets, e.g <nixpkgs>"
|
|
(let ((start (point)))
|
|
(when (eq (char-after) ?<)
|
|
(forward-char)
|
|
(if (and (nix-smie--skip-path 'forward t)
|
|
(eq (char-after) ?>))
|
|
(progn
|
|
(forward-char)
|
|
(buffer-substring-no-properties start (point)))
|
|
(ignore (goto-char start))))))
|
|
|
|
(defun nix-smie--skip-angle-path-backward ()
|
|
"Skip backward a path enclosed in angle brackets, e.g <nixpkgs>"
|
|
(let ((start (point)))
|
|
(when (eq (char-before) ?>)
|
|
(backward-char)
|
|
(if (and (nix-smie--skip-path 'backward t)
|
|
(eq (char-before) ?<))
|
|
(progn
|
|
(backward-char)
|
|
(buffer-substring-no-properties start (point)))
|
|
(ignore (goto-char start))))))
|
|
|
|
(defun nix-smie--skip-path (how &optional no-sep-check)
|
|
"Skip path related characters."
|
|
(let ((start (point)))
|
|
(pcase-exhaustive how
|
|
('forward (skip-chars-forward nix-smie--path-chars))
|
|
('backward (skip-chars-backward nix-smie--path-chars)))
|
|
(let ((sub (buffer-substring-no-properties start (point))))
|
|
(if (or (and no-sep-check
|
|
(< 0 (length sub)))
|
|
(string-match-p "/" sub))
|
|
sub
|
|
(ignore (goto-char start))))))
|
|
|
|
(defun nix-smie--forward-token-1 ()
|
|
"Move forward one token."
|
|
(forward-comment (point-max))
|
|
(or (nix-smie--skip-angle-path-forward)
|
|
(nix-smie--skip-path 'forward)
|
|
(buffer-substring-no-properties
|
|
(point)
|
|
(progn
|
|
(or (/= 0 (skip-syntax-forward "'w_"))
|
|
(/= 0 (skip-chars-forward nix-smie--symbol-chars))
|
|
(skip-syntax-forward ".'"))
|
|
(point)))))
|
|
|
|
(defun nix-smie--forward-token ()
|
|
"Move forward one token, skipping certain characters."
|
|
(let ((sym (nix-smie--forward-token-1)))
|
|
(if (member sym '(";" "?"))
|
|
;; The important lexer for indentation's performance is the backward
|
|
;; lexer, so for the forward lexer we delegate to the backward one.
|
|
(save-excursion (nix-smie--backward-token))
|
|
sym)))
|
|
|
|
(defun nix-smie--backward-token-1 ()
|
|
"Move backward one token."
|
|
(forward-comment (- (point)))
|
|
(or (nix-smie--skip-angle-path-backward)
|
|
(nix-smie--skip-path 'backward)
|
|
(buffer-substring-no-properties
|
|
(point)
|
|
(progn
|
|
(or (/= 0 (skip-syntax-backward "'w_"))
|
|
(/= 0 (skip-chars-backward nix-smie--symbol-chars))
|
|
(skip-syntax-backward ".'"))
|
|
(point)))))
|
|
|
|
(defun nix-smie--backward-token ()
|
|
"Move backward one token, skipping certain characters."
|
|
(let ((sym (nix-smie--backward-token-1)))
|
|
(unless (zerop (length sym))
|
|
(pcase sym
|
|
(";" (if (nix-smie--nonsep-semicolon-p) "nonsep-;" ";"))
|
|
("?" (if (nix-smie--arg-?-p) "arg-?" "?"))
|
|
(_ sym)))))
|
|
|
|
(defun nix-smie--nonsep-semicolon-p ()
|
|
"Whether the semicolon at point terminates a `with' or `assert'."
|
|
(save-excursion
|
|
(member (nth 2 (smie-backward-sexp " -bexpskip- ")) '("with" "assert"))))
|
|
|
|
(defun nix-smie--arg-?-p ()
|
|
"Whether the question mark at point is part of an argument declaration."
|
|
(member
|
|
(nth 2 (progn
|
|
(smie-backward-sexp)
|
|
(smie-backward-sexp)))
|
|
'("{" ",")))
|
|
|
|
(defun nix-smie--eol-p ()
|
|
"Whether there are no tokens after point on the current line."
|
|
(let ((eol (line-end-position)))
|
|
(save-excursion
|
|
(forward-comment (point-max))
|
|
(or (eobp)
|
|
(< eol (point))))))
|
|
|
|
(defun nix-smie--indent-close ()
|
|
"Align close paren with opening paren."
|
|
(save-excursion
|
|
(when (looking-at "\\s)")
|
|
(forward-char 1)
|
|
(condition-case nil
|
|
(progn
|
|
(backward-sexp 1)
|
|
;; If the opening paren is not the last token on its line,
|
|
;; and it's either '[' or '{', align to the opening paren's
|
|
;; position. Otherwise, align its line's anchor.
|
|
(if (and (memq (char-after) '(?\[ ?{))
|
|
(not (save-excursion (forward-char) (nix-smie--eol-p))))
|
|
(current-column)
|
|
(nix-smie--anchor)))
|
|
(scan-error nil)))))
|
|
|
|
(defun nix-smie--indent-exps ()
|
|
"This function replaces and is based on `smie-indent-exps'.
|
|
An argument to a function is indented relative to the function,
|
|
not to any other arguments."
|
|
(save-excursion
|
|
(let (parent ;; token enclosing the expression list
|
|
skipped) ;; whether we skipped at least one expression
|
|
(let ((start (point)))
|
|
(setq parent (nth 2 (smie-backward-sexp " -bseqskip- ")))
|
|
(setq skipped (not (eq start (point))))
|
|
(cond
|
|
((not skipped)
|
|
;; We're the first expression of the list. In that case, the
|
|
;; indentation should be (have been) determined by its context.
|
|
nil)
|
|
((equal parent "[")
|
|
;; It's a list, align with the first expression.
|
|
(current-column))
|
|
;; We're an argument.
|
|
(t
|
|
;; We can use (current-column) or (current-indentation) here.
|
|
;; (current-column) will indent relative to the first expression
|
|
;; in the sequence, and (current-indentation) will indent relative
|
|
;; to the indentation of the line on which the first expression
|
|
;; begins. I'm not sure which one is better.
|
|
(+ tab-width (current-indentation))))))))
|
|
|
|
;;; Indentation not using SMIE
|
|
|
|
(defun nix-find-backward-matching-token ()
|
|
"Find the previous Nix token."
|
|
(cond
|
|
((looking-at "in\\b")
|
|
(let ((counter 1))
|
|
(while (and (> counter 0)
|
|
(re-search-backward "\\b\\(let\\|in\\)\\b" nil t))
|
|
(unless (or (nix--get-string-type (nix--get-parse-state (point)))
|
|
(nix-is-comment-p))
|
|
(setq counter (cond ((looking-at "let") (- counter 1))
|
|
((looking-at "in") (+ counter 1))))))
|
|
counter ))
|
|
((looking-at "}")
|
|
(backward-up-list) t)
|
|
((looking-at "]")
|
|
(backward-up-list) t)
|
|
((looking-at ")")
|
|
(backward-up-list) t)))
|
|
|
|
(defun nix-indent-to-backward-match ()
|
|
"Match the previous line’s indentation."
|
|
(let ((matching-indentation (save-excursion
|
|
(beginning-of-line)
|
|
(skip-chars-forward "[:space:]")
|
|
(if (nix-find-backward-matching-token)
|
|
(current-indentation)))))
|
|
(when matching-indentation (indent-line-to matching-indentation) t)))
|
|
|
|
(defun nix-indent-first-line-in-block ()
|
|
"Indent the first line in a block."
|
|
|
|
(let ((matching-indentation (save-excursion
|
|
;; Go back to previous line that contain anything useful to check the
|
|
;; contents of that line.
|
|
(beginning-of-line)
|
|
(skip-chars-backward "\n[:space:]")
|
|
|
|
;; Grab the full string of the line before the one we're indenting
|
|
(let ((line (buffer-substring-no-properties (line-beginning-position) (line-end-position))))
|
|
;; Then regex-match strings at the end of the line to detect if we need to indent the line after.
|
|
;; We could probably add more things to look for here in the future.
|
|
(if (or (string-match "let$" line)
|
|
(string-match "import$" line)
|
|
(string-match "\\[$" line)
|
|
(string-match "=$" line)
|
|
(string-match "\($" line)
|
|
(string-match "\{$" line))
|
|
|
|
;; If it matches any of the regexes above, grab the indent level
|
|
;; of the line and add 2 to ident the line below this one.
|
|
(+ 2 (current-indentation)))))))
|
|
(when matching-indentation (indent-line-to matching-indentation) t)))
|
|
|
|
(defun nix-mode-search-backward ()
|
|
"Search backward for items of interest regarding indentation."
|
|
(re-search-backward nix-re-ends nil t)
|
|
(re-search-backward nix-re-quotes nil t)
|
|
(re-search-backward nix-re-caps nil t))
|
|
|
|
(defun nix-indent-expression-start ()
|
|
"Indent the start of a nix expression."
|
|
(let* ((ends 0)
|
|
(once nil)
|
|
(done nil)
|
|
(indent (current-indentation)))
|
|
(save-excursion
|
|
;; we want to indent this line, so we don't care what it
|
|
;; contains skip to the beginning so reverse searching doesn't
|
|
;; find any matches within
|
|
(beginning-of-line)
|
|
;; search backward until an unbalanced cap is found or no cap or
|
|
;; end is found
|
|
(while (and (not done) (nix-mode-search-backward))
|
|
(cond
|
|
((looking-at nix-re-quotes)
|
|
;; skip over strings entirely
|
|
(re-search-backward nix-re-quotes nil t))
|
|
((looking-at nix-re-comments)
|
|
;; skip over comments entirely
|
|
(re-search-backward nix-re-comments nil t))
|
|
((looking-at nix-re-ends)
|
|
;; count the matched end
|
|
;; this means we expect to find at least one more cap
|
|
(setq ends (+ ends 1)))
|
|
((looking-at nix-re-caps)
|
|
;; we found at least one cap
|
|
;; this means our function will return true
|
|
;; this signals to the caller we handled the indentation
|
|
(setq once t)
|
|
(if (> ends 0)
|
|
;; this cap corresponds to a previously matched end
|
|
;; reduce the number of unbalanced ends
|
|
(setq ends (- ends 1))
|
|
;; no unbalanced ends correspond to this cap
|
|
;; this means we have found the expression that contains our line
|
|
;; we want to indent relative to this line
|
|
(setq indent (current-indentation))
|
|
;; signal that the search loop should exit
|
|
(setq done t))))))
|
|
;; done is t when we found an unbalanced expression cap
|
|
(when done
|
|
;; indent relative to the indentation of the expression
|
|
;; containing our line
|
|
(indent-line-to (+ tab-width indent)))
|
|
;; return t to the caller if we found at least one cap
|
|
;; this signals that we handled the indentation
|
|
once))
|
|
|
|
(defun nix-indent-prev-level ()
|
|
"Get the indent level of the previous line."
|
|
(save-excursion
|
|
(beginning-of-line)
|
|
(skip-chars-backward "\n[:space:]")
|
|
(current-indentation)))
|
|
|
|
;;;###autoload
|
|
(defun nix-mode-format ()
|
|
"Format the entire `nix-mode' buffer."
|
|
(interactive)
|
|
(when (eq major-mode 'nix-mode)
|
|
(save-excursion
|
|
(goto-char (point-min))
|
|
(while (not (equal (point) (point-max)))
|
|
(if (equal (string-match-p "^[\s-]*$" (thing-at-point 'line)) 0)
|
|
(delete-horizontal-space)
|
|
(nix-indent-line))
|
|
(forward-line)))))
|
|
|
|
;;;###autoload
|
|
(defun nix-indent-line ()
|
|
"Indent current line in a Nix expression."
|
|
(interactive)
|
|
(let ((end-of-indentation
|
|
(save-excursion
|
|
(cond
|
|
;; Indent first line of file to 0
|
|
((= (line-number-at-pos) 1)
|
|
(indent-line-to 0))
|
|
|
|
;; comment
|
|
((save-excursion
|
|
(beginning-of-line)
|
|
(nix-is-comment-p))
|
|
(indent-line-to (nix-indent-prev-level)))
|
|
|
|
;; string
|
|
((save-excursion
|
|
(beginning-of-line)
|
|
(nth 3 (syntax-ppss)))
|
|
(indent-line-to (+ (nix-indent-prev-level)
|
|
(* tab-width
|
|
(+ (if (save-excursion
|
|
(forward-line -1)
|
|
(end-of-line)
|
|
(skip-chars-backward "[:space:]")
|
|
(looking-back "''" 0)) 1 0)
|
|
(if (save-excursion
|
|
(beginning-of-line)
|
|
(skip-chars-forward
|
|
"[:space:]")
|
|
(looking-at "''")
|
|
) -1 0)
|
|
)))))
|
|
|
|
;; dedent '}', ']', ')' 'in'
|
|
((nix-indent-to-backward-match))
|
|
|
|
;; indent line after 'let', 'import', '[', '=', '(', '{'
|
|
((nix-indent-first-line-in-block))
|
|
|
|
;; indent between = and ; + 2, or to 2
|
|
((nix-indent-expression-start))
|
|
|
|
;; else
|
|
(t
|
|
(indent-line-to (nix-indent-prev-level))))
|
|
(point))))
|
|
(when (> end-of-indentation (point)) (goto-char end-of-indentation))))
|
|
|
|
(defun nix-is-comment-p ()
|
|
"Whether we are in a comment."
|
|
(nth 4 (syntax-ppss)))
|
|
|
|
(defun nix-is-string-p ()
|
|
"Whether we are in a string."
|
|
(or (looking-at nix-re-quotes)
|
|
(nix--get-string-type (nix--get-parse-state (point)))))
|
|
|
|
;;;###autoload
|
|
(defun nix-indent-region (start end)
|
|
"Indent on a whole region. Enabled by default.
|
|
START where to start in region.
|
|
END where to end the region."
|
|
(interactive (list (region-beginning) (region-end)))
|
|
(save-excursion
|
|
(goto-char start)
|
|
(while (< (point) end)
|
|
(or (and (bolp) (eolp))
|
|
(when (and
|
|
;; Skip if previous line is empty or a comment.
|
|
(save-excursion
|
|
(let ((line-is-comment-p (nix-is-comment-p)))
|
|
(forward-line -1)
|
|
(not
|
|
(or (and (nix-is-comment-p)
|
|
;; Unless this line is a comment too.
|
|
(not line-is-comment-p))
|
|
(nix-is-comment-p)))))
|
|
;; Don't mess with strings.
|
|
(nix-is-string-p))
|
|
(funcall nix-indent-function)))
|
|
(forward-line 1))))
|
|
|
|
;;;###autoload
|
|
(defun nix-mode-ffap-nixpkgs-path (str)
|
|
"Support `ffap' for <nixpkgs> declarations.
|
|
If STR contains brackets, call `nix-instantiate' to find the
|
|
location of STR. If `nix-instantiate' has a nonzero exit code,
|
|
don’t do anything"
|
|
(when (and (string-match nix-re-bracket-path str)
|
|
(executable-find nix-instantiate-executable))
|
|
(with-temp-buffer
|
|
(when (eq (call-process nix-instantiate-executable nil (current-buffer)
|
|
nil "--eval" "-E" str) 0)
|
|
;; Remove trailing newline
|
|
(substring (buffer-string) 0 (- (buffer-size) 1))))))
|
|
|
|
;; Key maps
|
|
|
|
(defvar nix-mode-menu (make-sparse-keymap "Nix")
|
|
"Menu for Nix mode.")
|
|
|
|
(defvar nix-mode-map (make-sparse-keymap)
|
|
"Local keymap used for Nix mode.")
|
|
|
|
(defun nix-create-keymap ()
|
|
"Create the keymap associated with the Nix mode."
|
|
)
|
|
|
|
(defun nix-create-menu ()
|
|
"Create the Nix menu as shown in the menu bar."
|
|
(let ((m '("Nix"
|
|
["Format buffer" nix-format-buffer t])))
|
|
(easy-menu-define nix-mode-menu nix-mode-map "Menu keymap for Nix mode" m)))
|
|
|
|
(nix-create-keymap)
|
|
(nix-create-menu)
|
|
|
|
;;;###autoload
|
|
(define-derived-mode nix-mode prog-mode "Nix"
|
|
"Major mode for editing Nix expressions.
|
|
|
|
The following commands may be useful:
|
|
|
|
'\\[newline-and-indent]'
|
|
Insert a newline and move the cursor to align with the previous
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|
non-empty line.
|
|
|
|
'\\[fill-paragraph]'
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|
Refill a paragraph so that all lines are at most `fill-column'
|
|
lines long. This should do the right thing for comments beginning
|
|
with `#'. However, this command doesn't work properly yet if the
|
|
comment is adjacent to code (i.e., no intervening empty lines).
|
|
In that case, select the text to be refilled and use
|
|
`\\[fill-region]' instead.
|
|
|
|
The hook `nix-mode-hook' is run when Nix mode is started.
|
|
|
|
\\{nix-mode-map}
|
|
"
|
|
:group 'nix-mode
|
|
:syntax-table nix-mode-syntax-table
|
|
:abbrev-table nix-mode-abbrev-table
|
|
|
|
;; Disable hard tabs and set tab to 2 spaces
|
|
;; Recommended by nixpkgs manual: https://nixos.org/nixpkgs/manual/#sec-syntax
|
|
(setq-local indent-tabs-mode nil)
|
|
(setq-local tab-width 2)
|
|
(setq-local electric-indent-chars '(?\n ?{ ?} ?\[ ?\] ?\( ?\)))
|
|
|
|
;; Font lock support.
|
|
(setq-local font-lock-defaults '(nix-font-lock-keywords))
|
|
|
|
;; Special syntax properties for Nix
|
|
(setq-local syntax-propertize-function 'nix-syntax-propertize)
|
|
|
|
;; Look at text properties when parsing
|
|
(setq-local parse-sexp-lookup-properties t)
|
|
|
|
;; Setup SMIE integration
|
|
(when nix-mode-use-smie
|
|
(smie-setup nix-smie-grammar 'nix-smie-rules
|
|
:forward-token 'nix-smie--forward-token
|
|
:backward-token 'nix-smie--backward-token)
|
|
(setq-local smie-indent-basic 2)
|
|
(fset (make-local-variable 'smie-indent-exps)
|
|
(symbol-function 'nix-smie--indent-exps))
|
|
(fset (make-local-variable 'smie-indent-close)
|
|
(symbol-function 'nix-smie--indent-close)))
|
|
|
|
;; Automatic indentation [C-j]
|
|
(setq-local indent-line-function (lambda ()
|
|
(if (and (not nix-mode-use-smie)
|
|
(eq nix-indent-function 'smie-indent-line))
|
|
(indent-relative)
|
|
(funcall nix-indent-function))))
|
|
|
|
;; Indenting of comments
|
|
(setq-local comment-start "# ")
|
|
(setq-local comment-end "")
|
|
(setq-local comment-start-skip "\\(^\\|\\s-\\);?#+ *")
|
|
(setq-local comment-multi-line t)
|
|
|
|
;; Filling of comments
|
|
(setq-local adaptive-fill-mode t)
|
|
(setq-local paragraph-start "[ \t]*\\(#+[ \t]*\\)?$")
|
|
(setq-local paragraph-separate paragraph-start)
|
|
|
|
;; Menu
|
|
(easy-menu-add nix-mode-menu nix-mode-map)
|
|
|
|
;; Find file at point
|
|
(push '(nix-mode . nix-mode-ffap-nixpkgs-path) ffap-alist)
|
|
(push '(nix-mode "--:\\\\${}<>+@-Z_[:alpha:]~*?" "@" "@;.,!:")
|
|
ffap-string-at-point-mode-alist))
|
|
|
|
;;;###autoload
|
|
(add-to-list 'auto-mode-alist '("\\.nix\\'" . nix-mode))
|
|
|
|
(provide 'nix-mode)
|
|
;;; nix-mode.el ends here
|