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;;; haskell-cabal.el --- Support for Cabal packages
;; Copyright (C) 2007, 2008 Stefan Monnier
;; Author: Stefan Monnier <>
;; 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:
;; Todo:
;; - distinguish continued lines from indented lines.
;; - indent-line-function.
;; - outline-minor-mode.
;;; Code:
;; (defun haskell-cabal-extract-fields-from-doc ()
;; (require 'xml)
;; (require 'cl)
;; (let ((section (completing-read
;; "Section: "
;; '("general-fields" "library" "executable" "buildinfo"))))
;; (goto-char (point-min))
;; (search-forward (concat "<sect3 id=\"" section "\">")))
;; (let* ((xml (xml-parse-region
;; (progn (search-forward "<variablelist>") (match-beginning 0))
;; (progn (search-forward "</variablelist>") (point))))
;; (varlist (remove-if-not 'consp (cddar xml)))
;; (syms (mapcar (lambda (entry) (caddr (assq 'literal (assq 'term entry))))
;; varlist))
;; (fields (mapcar (lambda (sym) (substring-no-properties sym 0 -1)) syms)))
;; fields))
(eval-when-compile (require 'cl))
(defconst haskell-cabal-general-fields
;; Extracted with (haskell-cabal-extract-fields-from-doc "general-fields")
'("name" "version" "cabal-version" "license" "license-file" "copyright"
"author" "maintainer" "stability" "homepage" "package-url" "synopsis"
"description" "category" "tested-with" "build-depends" "data-files"
"extra-source-files" "extra-tmp-files"))
(defconst haskell-cabal-library-fields
;; Extracted with (haskell-cabal-extract-fields-from-doc "library")
(defconst haskell-cabal-executable-fields
;; Extracted with (haskell-cabal-extract-fields-from-doc "executable")
'("executable" "main-is"))
(defconst haskell-cabal-buildinfo-fields
;; Extracted with (haskell-cabal-extract-fields-from-doc "buildinfo")
'("buildable" "other-modules" "hs-source-dirs" "extensions" "ghc-options"
"ghc-prof-options" "hugs-options" "nhc-options" "includes"
"install-includes" "include-dirs" "c-sources" "extra-libraries"
"extra-lib-dirs" "cc-options" "ld-options" "frameworks"))
(defvar haskell-cabal-mode-syntax-table
(let ((st (make-syntax-table)))
;; The comment syntax can't be described simply in syntax-table.
;; We could use font-lock-syntactic-keywords, but is it worth it?
;; (modify-syntax-entry ?- ". 12" st)
(modify-syntax-entry ?\n ">" st)
(defvar haskell-cabal-font-lock-keywords
;; The comment syntax can't be described simply in syntax-table.
;; We could use font-lock-syntactic-keywords, but is it worth it?
'(("^[ \t]*--.*" . font-lock-comment-face)
("^ *\\([^ \t:]+\\):" (1 font-lock-keyword-face))
("^\\(Library\\)[ \t]*\\({\\|$\\)" (1 font-lock-keyword-face))
("^\\(Executable\\)[ \t]+\\([^\n \t]*\\)"
(1 font-lock-keyword-face) (2 font-lock-function-name-face))
("^\\(Flag\\)[ \t]+\\([^\n \t]*\\)"
(1 font-lock-keyword-face) (2 font-lock-constant-face))
("^ *\\(if\\)[ \t]+.*\\({\\|$\\)" (1 font-lock-keyword-face))
("^ *\\(}[ \t]*\\)?\\(else\\)[ \t]*\\({\\|$\\)"
(2 font-lock-keyword-face))))
(defvar haskell-cabal-buffers nil
"List of Cabal buffers.")
;; (defsubst* inferior-haskell-string-prefix-p (str1 str2)
;; "Return non-nil if STR1 is a prefix of STR2"
;; (eq t (compare-strings str2 nil (length str1) str1 nil nil)))
(defun haskell-cabal-find-file ()
"Return a buffer visiting the cabal file of the current directory, or nil."
(catch 'found
;; ;; First look for it in haskell-cabal-buffers.
;; (dolist (buf haskell-cabal-buffers)
;; (if (inferior-haskell-string-prefix-p
;; (with-current-buffer buf default-directory) default-directory)
;; (throw 'found buf)))
;; Then look up the directory hierarchy.
(let ((user (nth 2 (file-attributes default-directory)))
;; Abbreviate, so as to stop when we cross ~/.
(root (abbreviate-file-name default-directory))
(while (and root (equal user (nth 2 (file-attributes root))))
(if (setq files (directory-files root 'full "\\.cabal\\'"))
;; Avoid the .cabal directory.
(dolist (file files (throw 'found nil))
(unless (file-directory-p file)
(throw 'found (find-file-noselect file))))
(if (equal root
(setq root (file-name-directory
(directory-file-name root))))
(setq root nil))))
(defun haskell-cabal-buffers-clean (&optional buffer)
(let ((bufs ()))
(dolist (buf haskell-cabal-buffers)
(if (and (buffer-live-p buf) (not (eq buf buffer))
(with-current-buffer buf (derived-mode-p 'haskell-cabal-mode)))
(push buf bufs)))
(setq haskell-cabal-buffers bufs)))
(defun haskell-cabal-unregister-buffer ()
(haskell-cabal-buffers-clean (current-buffer)))
(add-to-list 'auto-mode-alist '("\\.cabal\\'" . haskell-cabal-mode))
(define-derived-mode haskell-cabal-mode fundamental-mode "Haskell-Cabal"
"Major mode for Cabal package description files."
(set (make-local-variable 'font-lock-defaults)
'(haskell-cabal-font-lock-keywords t t nil nil))
(add-to-list 'haskell-cabal-buffers (current-buffer))
(add-hook 'change-major-mode-hook 'haskell-cabal-unregister-buffer nil 'local)
(add-hook 'kill-buffer-hook 'haskell-cabal-unregister-buffer nil 'local)
(set (make-local-variable 'comment-start) "-- ")
(set (make-local-variable 'comment-start-skip) "\\(^[ \t]*\\)--[ \t]*")
(set (make-local-variable 'comment-end) "")
(set (make-local-variable 'comment-end-skip) "[ ]*\\(\\s>\\|\n\\)")
(defun haskell-cabal-get-setting (name)
(let ((case-fold-search t))
(goto-char (point-min))
(when (re-search-forward
(concat "^" (regexp-quote name)
":[ \t]*\\(.*\\(\n[ \t]+[ \t\n].*\\)*\\)")
nil t)
(let ((val (match-string 1))
(start 1))
(when (match-end 2) ;Multiple lines.
;; The documentation is not very precise about what to do about
;; the \n and the indentation: are they part of the value or
;; the encoding? I take the point of view that \n is part of
;; the value (so that values can span multiple lines as well),
;; and that only the first char in the indentation is part of
;; the encoding, the rest is part of the value (otherwise, lines
;; in the value cannot start with spaces or tabs).
(while (string-match "^[ \t]\\(?:\\.$\\)?" val start)
(setq start (1+ (match-beginning 0)))
(setq val (replace-match "" t t val))))
(provide 'haskell-cabal)
;; arch-tag: d455f920-5e4d-42b6-a2c7-4a7e84a05c29
;;; haskell-cabal.el ends here
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