Remove nix-mode.el from Nix.

This removes the file nix-mode.el from Nix. The file is now available within the
repository https://github.com/NixOS/nix-mode.

Fixes #662
Fixes #1040
Fixes #1054
Fixes #1055
Closes #1119
Fixes #1419

NOTE: all of the above should be fixed within NixOS/nix-mode. If one of those
hasn’t please reopen within NixOS/nix-mode and not within NixOS/nix.

3 files changed, 0 insertions, 188 deletions

diff --git a/misc/emacs/README b/misc/emacs/README
deleted file mode 100644
index 8c87f67d5718..000000000000
--- a/misc/emacs/README
+++ /dev/null
@@ -1,10 +0,0 @@
-The Nix Emacs mode supports syntax highlighting, somewhat sensible
-indenting, and refilling of comments.
-
-To enable Nix mode in Emacs, add something like this to your ~/.emacs
-file:
-
-  (load "/nix/share/emacs/site-lisp/nix-mode.el")
-
-This automatically causes Nix mode to be activated for all files with
-extension `.nix'.
diff --git a/misc/emacs/local.mk b/misc/emacs/local.mk
deleted file mode 100644
index 8e06b881bcdf..000000000000
--- a/misc/emacs/local.mk
+++ /dev/null
@@ -1 +0,0 @@
-$(eval $(call install-data-in,$(d)/nix-mode.el,$(datadir)/emacs/site-lisp))
diff --git a/misc/emacs/nix-mode.el b/misc/emacs/nix-mode.el
deleted file mode 100644
index e129e9efe1d4..000000000000
--- a/misc/emacs/nix-mode.el
+++ /dev/null
@@ -1,177 +0,0 @@
-;;; nix-mode.el --- Major mode for editing Nix expressions
-
-;; Author: Eelco Dolstra
-;; URL: https://github.com/NixOS/nix/tree/master/misc/emacs
-;; Version: 1.0
-
-;;; Commentary:
-
-;;; Code:
-
-(defun nix-syntax-match-antiquote (limit)
-  (let ((pos (next-single-char-property-change (point) 'nix-syntax-antiquote
-                                               nil limit)))
-    (when (and pos (> pos (point)))
-      (goto-char pos)
-      (let ((char (char-after pos)))
-        (pcase char
-          (`?$
-           (forward-char 2))
-          (`?}
-           (forward-char 1)))
-        (set-match-data (list pos (point)))
-        t))))
-
-(defconst nix-font-lock-keywords
-  '("\\_<if\\_>" "\\_<then\\_>" "\\_<else\\_>" "\\_<assert\\_>" "\\_<with\\_>"
-    "\\_<let\\_>" "\\_<in\\_>" "\\_<rec\\_>" "\\_<inherit\\_>" "\\_<or\\_>"
-    ("\\_<true\\_>" . font-lock-builtin-face)
-    ("\\_<false\\_>" . font-lock-builtin-face)
-    ("\\_<null\\_>" . font-lock-builtin-face)
-    ("\\_<import\\_>" . font-lock-builtin-face)
-    ("\\_<derivation\\_>" . font-lock-builtin-face)
-    ("\\_<baseNameOf\\_>" . font-lock-builtin-face)
-    ("\\_<toString\\_>" . font-lock-builtin-face)
-    ("\\_<isNull\\_>" . font-lock-builtin-face)
-    ("[a-zA-Z][a-zA-Z0-9\\+-\\.]*:[a-zA-Z0-9%/\\?:@&=\\+\\$,_\\.!~\\*'-]+"
-     . font-lock-constant-face)
-    ("\\<\\([a-zA-Z_][a-zA-Z0-9_'\-\.]*\\)[ \t]*="
-     (1 font-lock-variable-name-face nil nil))
-    ("<[a-zA-Z0-9._\\+-]+\\(/[a-zA-Z0-9._\\+-]+\\)*>"
-     . font-lock-constant-face)
-    ("[a-zA-Z0-9._\\+-]*\\(/[a-zA-Z0-9._\\+-]+\\)+"
-     . font-lock-constant-face)
-    (nix-syntax-match-antiquote 0 font-lock-preprocessor-face t))
-  "Font lock keywords for nix.")
-
-(defvar nix-mode-syntax-table
-  (let ((table (make-syntax-table)))
-    (modify-syntax-entry ?/ ". 14" table)
-    (modify-syntax-entry ?* ". 23" table)
-    (modify-syntax-entry ?# "< b" table)
-    (modify-syntax-entry ?\n "> b" table)
-    table)
-  "Syntax table for Nix mode.")
-
-(defun nix-syntax-propertize-escaped-antiquote ()
-  "Set syntax properies for escaped antiquote marks."
-  nil)
-
-(defun nix-syntax-propertize-multiline-string ()
-  "Set syntax properies for multiline string delimiters."
-  (let* ((start (match-beginning 0))
-         (end (match-end 0))
-         (context (save-excursion (save-match-data (syntax-ppss start))))
-         (string-type (nth 3 context)))
-    (pcase string-type
-      (`t
-       ;; inside a multiline string
-       ;; ending multi-line string delimiter
-       (put-text-property (1- end) end
-                          'syntax-table (string-to-syntax "|")))
-      (`nil
-       ;; beginning multi-line string delimiter
-       (put-text-property start (1+ start)
-                          'syntax-table (string-to-syntax "|"))))))
-
-(defun nix-syntax-propertize-antiquote ()
-  "Set syntax properties for antiquote marks."
-  (let* ((start (match-beginning 0)))
-    (put-text-property start (1+ start)
-                       'syntax-table (string-to-syntax "|"))
-    (put-text-property start (+ start 2)
-                       'nix-syntax-antiquote t)))
-
-(defun nix-syntax-propertize-close-brace ()
-  "Set syntax properties for close braces.
-If a close brace `}' ends an antiquote, the next character begins a string."
-  (let* ((start (match-beginning 0))
-         (end (match-end 0))
-         (context (save-excursion (save-match-data (syntax-ppss start))))
-         (open (nth 1 context)))
-    (when open ;; a corresponding open-brace was found
-      (let* ((antiquote (get-text-property open 'nix-syntax-antiquote)))
-        (when antiquote
-          (put-text-property (+ start 1) (+ start 2)
-                             'syntax-table (string-to-syntax "|"))
-          (put-text-property start (1+ start)
-                             'nix-syntax-antiquote t))))))
-
-(defun nix-syntax-propertize (start end)
-  "Special syntax properties for Nix."
-  ;; search for multi-line string delimiters
-  (goto-char start)
-  (remove-text-properties start end '(syntax-table nil nix-syntax-antiquote nil))
-  (funcall
-   (syntax-propertize-rules
-    ("''\\${"
-     (0 (ignore (nix-syntax-propertize-escaped-antiquote))))
-    ("''"
-     (0 (ignore (nix-syntax-propertize-multiline-string))))
-    ("\\${"
-     (0 (ignore (nix-syntax-propertize-antiquote))))
-    ("}"
-     (0 (ignore (nix-syntax-propertize-close-brace)))))
-   start end))
-
-(defun nix-indent-line ()
-  "Indent current line in a Nix expression."
-  (interactive)
-  (indent-relative-maybe))
-
-
-;;;###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
-    non-empty line.
-
-  '\\[fill-paragraph]'
-    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}
-"
-  (set-syntax-table nix-mode-syntax-table)
-
-  ;; Font lock support.
-  (setq-local font-lock-defaults '(nix-font-lock-keywords nil nil nil nil))
-
-  ;; 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)
-
-  ;; Automatic indentation [C-j].
-  (set (make-local-variable 'indent-line-function) 'nix-indent-line)
-
-  ;; Indenting of comments.
-  (set (make-local-variable 'comment-start) "# ")
-  (set (make-local-variable 'comment-end) "")
-  (set (make-local-variable 'comment-start-skip) "\\(^\\|\\s-\\);?#+ *")
-
-  ;; Filling of comments.
-  (set (make-local-variable 'adaptive-fill-mode) t)
-  (set (make-local-variable 'paragraph-start) "[ \t]*\\(#+[ \t]*\\)?$")
-  (set (make-local-variable 'paragraph-separate) paragraph-start))
-
-
-;;;###autoload
-(progn
-  (add-to-list 'auto-mode-alist '("\\.nix\\'" . nix-mode))
-  (add-to-list 'auto-mode-alist '("\\.nix.in\\'" . nix-mode)))
-
-(provide 'nix-mode)
-
-;;; nix-mode.el ends here