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;;; ghc-core.el --- Syntax highlighting module for GHC Core
;; Copyright (C) 2010 Johan Tibell
;; Author: Johan Tibell <>
;; This file is not part of GNU Emacs.
;; This file is free software; you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation; either version 3, or (at your option)
;; any later version.
;; This file is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; GNU General Public License for more details.
;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs; see the file COPYING. If not, write to
;; the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
;; Boston, MA 02110-1301, USA.
;;; Commentary:
;; Purpose:
;; To make it easier to read GHC Core output by providing highlighting
;; and removal of commonly ignored annotations.
;;; Code:
(require 'haskell-mode)
(require 'haskell-font-lock)
(defgroup ghc-core nil
"Major mode for viewing pretty printed GHC Core output."
:link '(custom-manual "(haskell-mode)")
:group 'haskell
:prefix "ghc-core-")
(defcustom ghc-core-program
"Name of the GHC executable (excluding any arguments)."
:type 'string
:group 'ghc-core)
(defcustom ghc-core-program-args
"Additional options to be passed to GHC when generating core output.
GHC (see variable `ghc-core-program') is invoked with the basic
command line options \"-ddump-simpl -c <source-file>\"
followed by the additional options defined here.
The following `-ddump-simpl` options might be of interest:
- `-dsuppress-all'
- `-dsuppress-uniques'
- `-dsuppress-idinfo'
- `-dsuppress-module-prefixes'
- `-dsuppress-type-signatures'
- `-dsuppress-type-applications'
- `-dsuppress-coercions'
See `M-x manual-entry RET ghc' for more details."
:type '(repeat (string :tag "Argument"))
:group 'ghc-core)
(define-obsolete-variable-alias 'ghc-core-create-options 'ghc-core-program-args
"haskell-mode 13.7")
(defun ghc-core-clean-region (start end)
"Remove commonly ignored annotations and namespace prefixes
in the region between START and END."
(interactive "r")
(narrow-to-region start end)
(goto-char (point-min))
(while (search-forward-regexp "GHC\.[^\.]*\." nil t)
(replace-match "" nil t))
(goto-char (point-min))
(while (flush-lines "^ *GblId *$" nil))
(goto-char (point-min))
(while (flush-lines "^ *LclId *$" nil))
(goto-char (point-min))
(while (flush-lines (concat "^ *\\[\\(?:Arity [0-9]+\\|NoCafRefs\\|"
"Str: DmdType\\|Worker \\)"
"\\([^]]*\\n?\\).*\\] *$") nil))
(goto-char (point-min))
(while (search-forward "Main." nil t) (replace-match "" nil t))))
(defun ghc-core-clean-buffer ()
"Remove commonly ignored annotations and namespace prefixes
in the current buffer."
(ghc-core-clean-region (point-min) (point-max)))
(defun ghc-core-create-core ()
"Compile and load the current buffer as tidy core."
(let* ((core-buffer (generate-new-buffer "ghc-core"))
(neh (lambda () (kill-buffer core-buffer))))
(add-hook 'next-error-hook neh)
(apply #'call-process ghc-core-program nil core-buffer nil
"-ddump-simpl" "-c" (buffer-file-name) ghc-core-program-args)
(display-buffer core-buffer)
(with-current-buffer core-buffer
(remove-hook 'next-error-hook neh)))
(add-to-list 'auto-mode-alist '("\\.hcr\\'" . ghc-core-mode))
(add-to-list 'auto-mode-alist '("\\.dump-simpl\\'" . ghc-core-mode))
(define-derived-mode ghc-core-mode haskell-mode "GHC-Core"
"Major mode for GHC Core files.")
(provide 'ghc-core)
;;; ghc-core.el ends here