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;;; hs-mode.el — Haskell editing mode.
;; Copyright (C) 2011 Chris Done
;; For parts taken from haskell-mode:
;; Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008 Free Software Foundation, Inc
;; Copyright (C) 1992, 1997-1998 Simon Marlow, Graeme E Moss, and Tommy Thorn
;; This program 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 of the
;; License, or (at your option) any later version.
;; This program is distributed in the hope that it will be useful, but
;; WITHOUT ANY WARRANTY; without even the implied warranty of
;; General Public License for more details.
;; You should have received a copy of the GNU General Public License
;; along with this program. If not, see
;; <>.
;;; Commentary:
;;; Code:
(require 'hs-types)
(define-derived-mode hs-mode nil "Haskell" ""
(make-local-variable 'hs-mode)
(setq hs-mode t)
(use-local-map hs-mode-map)
(setq major-mode 'hs-mode)
(setq mode-name "Haskell")
(set (make-local-variable 'font-lock-defaults)
'(hs-mode-font-lock-keywords t nil nil nil))
(set (make-local-variable 'comment-start) "-- ")
(set (make-local-variable 'comment-padding) 0)
(set (make-local-variable 'comment-start-skip) "[-{]-[ \t]*")
(set (make-local-variable 'comment-end) "")
(set (make-local-variable 'comment-end-skip) "[ \t]*\\(-}\\|\\s>\\)")
(setq hs-imenu-generic-expression
'(("Functions" "^\\([a-z].+\\) ::" 1)
("Types" "^\\(data \\|newtype \\|type \\)\\([^=]*[^:]\\)=" 2)
("Instances" "^instance[ ]+\\(.+?\\)[ ]+\\($\\|where$\\)" 1)))
(setq imenu-generic-expression hs-imenu-generic-expression))
(defvar hs-mode-font-lock-keywords
`(;; Comments
("[ ]+-- .*" . font-lock-comment-face)
("^-- | .*" . font-lock-doc-face)
("^--.*" . font-lock-comment-face)
("{- | [[:unibyte:]]+? -}" . font-lock-doc-face)
("{- [[:unibyte:]]+? -}" . font-lock-comment-face)
("{-# [[:unibyte:]]+? #-}" . font-lock-doc-face)
;; Strings
(,(concat "\\(\\(\"\\|\n[ \t]*\\\\\\)\\([^\"\\\\\n]\\|\\\\.\\)"
"*\\(\"\\|\\\\[ \t]*$\\)\\|'\\([^'\\\\\n]\\|\\\\.[^'\n]*\\)'\\)")
. font-lock-string-face)
;; Keywords
(regexp-opt '("case" "class" "data" "default" "deriving" "do" "else"
"if" "import" "in" "infix" "infixl" "infixr" "instance"
"let" "module" "newtype" "of" "then" "type" "where" "as"
"qualified" "hiding")))
. font-lock-keyword-face)
;; Constructors and types
("\\(\\<[A-Z][A-Za-z0-9_']*\\>\\|\\[\\]\\|()\\)" . font-lock-type-face)
;; Function declarations
("^[_a-z][A-Za-z0-9_']*" . font-lock-function-name-face)
;; Numbers
("[0-9]+\\.?[0-9]*" . font-lock-constant-face)
;; Operators
("[-!#$%&\\*\\+\\./<=>\\?@\\\\^\\|~]+" . font-lock-constant-face)
;; Reserved symbols
(,(regexp-opt '(".." "::" "=" "\\" "|" "<-" "->"
"@" "~" "=>") t)
. font-lock-keyword-face)))
(defvar hs-mode-map
(let ((map (make-sparse-keymap)))
"Haskell mode map.")
(defun hs-mode-newline-same-col ()
"Make a newline and go to the same column as the current line."
(let ((point (point)))
(let ((start-end
(let* ((start (line-beginning-position))
(end (progn (goto-char start)
"[^ ]" (line-end-position) t 1))))
(when end (cons start (1- end)))))))
(if start-end
(progn (newline)
(insert (buffer-substring-no-properties
(car start-end) (cdr start-end))))
(defun hs-mode-newline-indent ()
"Make a newline on the current column and indent on step."
(insert " "))
;; Taken from haskell-mode.
(defun hs-ident-at-point ()
"Return the identifier under point, or nil if none found.
May return a qualified name."
(let ((case-fold-search nil))
(multiple-value-bind (start end)
(if (looking-at "\\s_")
(values (progn (skip-syntax-backward "_") (point))
(progn (skip-syntax-forward "_") (point)))
(progn (skip-syntax-backward "w'")
(skip-syntax-forward "'") (point))
(progn (skip-syntax-forward "w'") (point))))
;; If we're looking at a module ID that qualifies further IDs, add
;; those IDs.
(goto-char start)
(while (and (looking-at "[[:upper:]]") (eq (char-after end) ?.)
;; It's a module ID that qualifies further IDs.
(goto-char (1+ end))
(when (not (zerop (skip-syntax-forward
(if (looking-at "\\s_") "_" "w'"))))
(setq end (point))))))
;; If we're looking at an ID that's itself qualified by previous
;; module IDs, add those too.
(goto-char start)
(if (eq (char-after) ?.) (forward-char 1)) ;Special case for "."
(while (and (eq (char-before) ?.)
(progn (forward-char -1)
(not (zerop (skip-syntax-backward "w'"))))
(skip-syntax-forward "'")
(looking-at "[[:upper:]]"))
(setq start (point)))
;; This is it.
(buffer-substring-no-properties start end)))))
(defun hs-mode-space-info ()
(insert " ")
(let ((ident (hs-ident-at-point)))
(when (and (stringp ident) (not (string= "" ident)))
(hs-process-info-of-passive-interactive ident))))
(defun hs-mode-insert-at-top (s)
"Insert some string at the top of the line."
(goto-char (point-min))
(insert (format "%s\n" s)))
(defun hs-mode-insert-language-extension ()
"Choose a language extension and insert it at the top of the file."
(format "{-# LANGUAGE %s #-}"
(ido-completing-read "Extension: " hs-completion-ghc-extensions))))
(defun hs-mode-bring-interactive-mode ()
"Bring up the interactive mode for this project."
(let ((project (hs-project)))
(hs-interactive-mode-buffer project))
(other-window 1)))
(provide 'hs-mode)
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