Support Vim, Tmux, Emacs with Stow

After moving off of Meta, Dotfiles has a greater responsibility to
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1 files changed, 1178 insertions, 0 deletions

diff --git a/configs/shared/emacs/.emacs.d/elpa/haskell-mode-20180601.143/haskell-cabal.el b/configs/shared/emacs/.emacs.d/elpa/haskell-mode-20180601.143/haskell-cabal.el
new file mode 100644
index 000000000000..35dcca6c597a
--- /dev/null
+++ b/configs/shared/emacs/.emacs.d/elpa/haskell-mode-20180601.143/haskell-cabal.el
@@ -0,0 +1,1178 @@
+;;; haskell-cabal.el --- Support for Cabal packages -*- lexical-binding: t -*-
+
+;; Copyright © 2007, 2008  Stefan Monnier
+;;             2016 Arthur Fayzrakhmanov
+
+;; Author: Stefan Monnier <monnier@iro.umontreal.ca>
+
+;; 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
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;; 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)
+;;   (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 (cl-remove-if-not 'consp (cl-cddar xml)))
+;;          (syms (mapcar (lambda (entry) (cl-caddr (assq 'literal (assq 'term entry))))
+;;                        varlist))
+;;          (fields (mapcar (lambda (sym) (substring-no-properties sym 0 -1)) syms)))
+;;     fields))
+
+(require 'cl-lib)
+(require 'haskell-utils)
+
+(defcustom haskell-hasktags-path "hasktags"
+  "Path to `hasktags' executable."
+  :group 'haskell
+  :type 'string)
+
+(defcustom haskell-hasktags-arguments '("-e" "-x")
+  "Additional arguments for `hasktags' executable.
+By default these are:
+
+-e - generate ETAGS file
+-x - generate additional information in CTAGS file."
+  :group 'haskell
+  :type '(list string))
+
+(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")
+  '("exposed-modules"))
+
+(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)
+    (modify-syntax-entry ?- "w" st)
+    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]*\\({\\|$\\)" (1 font-lock-keyword-face))
+    ("^\\(Executable\\|Test-Suite\\|Benchmark\\)[ \t]+\\([^\n \t]*\\)"
+     (1 font-lock-keyword-face) (2 font-lock-function-name-face))
+    ("^\\(Flag\\)[ \t]+\\([^\n \t]*\\)"
+     (1 font-lock-keyword-face) (2 font-lock-constant-face))
+    ("^\\(Source-Repository\\)[ \t]+\\(head\\|this\\)"
+     (1 font-lock-keyword-face) (2 font-lock-constant-face))
+    ("^ *\\(if\\)[ \t]+.*\\({\\|$\\)" (1 font-lock-keyword-face))
+    ("^ *\\(}[ \t]*\\)?\\(else\\)[ \t]*\\({\\|$\\)"
+     (2 font-lock-keyword-face))
+    ("\\<\\(?:True\\|False\\)\\>"
+     (0 font-lock-constant-face))))
+
+(defvar haskell-cabal-buffers nil
+  "List of Cabal buffers.")
+
+(defun haskell-cabal-buffers-clean (&optional buffer)
+  "Refresh list of known cabal buffers.
+
+Check each buffer in variable `haskell-cabal-buffers' and remove
+it from list if one of the following conditions are hold:
++ buffer is killed;
++ buffer's mode is not derived from `haskell-cabal-mode';
++ buffer is a BUFFER (if given)."
+  (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 ()
+  "Exclude current buffer from global list of known cabal buffers."
+  (haskell-cabal-buffers-clean (current-buffer)))
+
+;;;###autoload
+(add-to-list 'auto-mode-alist '("\\.cabal\\'" . haskell-cabal-mode))
+
+(defvar haskell-cabal-mode-map
+  (let ((map (make-sparse-keymap)))
+    (define-key map (kbd "C-c C-s") 'haskell-cabal-subsection-arrange-lines)
+    (define-key map (kbd "C-M-n") 'haskell-cabal-next-section)
+    (define-key map (kbd "C-M-p") 'haskell-cabal-previous-section)
+    (define-key map (kbd "M-n") 'haskell-cabal-next-subsection)
+    (define-key map (kbd "M-p") 'haskell-cabal-previous-subsection)
+    (define-key map (kbd "C-<down>") 'haskell-cabal-next-subsection)
+    (define-key map (kbd "C-<up>") 'haskell-cabal-previous-subsection)
+    (define-key map (kbd "C-c C-f") 'haskell-cabal-find-or-create-source-file)
+    (define-key map (kbd "M-g l") 'haskell-cabal-goto-library-section)
+    (define-key map (kbd "M-g e") 'haskell-cabal-goto-executable-section)
+    (define-key map (kbd "M-g b") 'haskell-cabal-goto-benchmark-section)
+    (define-key map (kbd "M-g t") 'haskell-cabal-goto-test-suite-section)
+    map))
+
+;;;###autoload
+(define-derived-mode haskell-cabal-mode fundamental-mode "Haskell-Cabal"
+  "Major mode for Cabal package description files."
+  (setq-local 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)
+  (setq-local comment-start "-- ")
+  (setq-local comment-start-skip "\\(^[ \t]*\\)--[ \t]*")
+  (setq-local comment-end "")
+  (setq-local comment-end-skip "[ \t]*\\(\\s>\\|\n\\)")
+  (setq-local indent-line-function 'haskell-cabal-indent-line)
+  (setq indent-tabs-mode nil)
+  )
+
+(make-obsolete 'haskell-cabal-get-setting
+               'haskell-cabal--get-field
+               "March 14, 2016")
+(defalias 'haskell-cabal-get-setting 'haskell-cabal--get-field
+  "Try to read value of field with NAME from current buffer.
+Obsolete function.  Defined for backward compatibility.  Use
+`haskell-cabal--get-field' instead.")
+
+(defun haskell-cabal--get-field (name)
+  "Try to read value of field with NAME from current buffer."
+  (save-excursion
+    (let ((case-fold-search t))
+      (goto-char (point-min))
+      (when (re-search-forward
+             (concat "^[ \t]*" (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))))
+          val)))))
+
+
+(make-obsolete 'haskell-cabal-guess-setting
+               'haskell-cabal-get-field
+               "March 14, 2016")
+(defalias 'haskell-cabal-guess-setting 'haskell-cabal-get-field
+  "Read the value of field with NAME from project's cabal file.
+Obsolete function.  Defined for backward compatibility.  Use
+`haskell-cabal-get-field' instead.")
+
+;;;###autoload
+(defun haskell-cabal-get-field (name)
+  "Read the value of field with NAME from project's cabal file.
+If there is no valid .cabal file to get the setting from (or
+there is no corresponding setting with that name in the .cabal
+file), then this function returns nil."
+  (interactive)
+  (when (and name buffer-file-name)
+    (let ((cabal-file (haskell-cabal-find-file)))
+      (when (and cabal-file (file-readable-p cabal-file))
+        (with-temp-buffer
+          (insert-file-contents cabal-file)
+          (haskell-cabal--get-field name))))))
+
+;;;###autoload
+(defun haskell-cabal-get-dir (&optional use-defaults)
+  "Get the Cabal dir for a new project. Various ways of figuring this out,
+   and indeed just prompting the user. Do them all."
+  (let* ((file (haskell-cabal-find-file))
+         (dir (if file (file-name-directory file) default-directory)))
+    (if use-defaults
+        dir
+        (haskell-utils-read-directory-name
+         (format "Cabal dir%s: " (if file (format " (guessed from %s)" (file-relative-name file)) ""))
+         dir))))
+
+(defun haskell-cabal-compute-checksum (dir)
+  "Compute MD5 checksum of package description file in DIR.
+Return nil if no Cabal description file could be located via
+`haskell-cabal-find-pkg-desc'."
+  (let ((cabal-file (haskell-cabal-find-pkg-desc dir)))
+    (when cabal-file
+      (with-temp-buffer
+        (insert-file-contents cabal-file)
+        (md5 (buffer-string))))))
+
+(defun haskell-cabal-find-file (&optional dir)
+  "Search for package description file upwards starting from DIR.
+If DIR is nil, `default-directory' is used as starting point for
+directory traversal.  Upward traversal is aborted if file owner
+changes.  Uses `haskell-cabal-find-pkg-desc' internally."
+  (let ((use-dir (or dir default-directory)))
+    (while (and use-dir (not (file-directory-p use-dir)))
+      (setq use-dir (file-name-directory (directory-file-name use-dir))))
+    (when use-dir
+      (catch 'found
+        (let ((user (nth 2 (file-attributes use-dir)))
+              ;; Abbreviate, so as to stop when we cross ~/.
+              (root (abbreviate-file-name use-dir)))
+          ;; traverse current dir up to root as long as file owner doesn't change
+          (while (and root (equal user (nth 2 (file-attributes root))))
+            (let ((cabal-file (haskell-cabal-find-pkg-desc root)))
+              (when cabal-file
+                (throw 'found cabal-file)))
+
+            (let ((proot (file-name-directory (directory-file-name root))))
+              (if (equal proot root) ;; fix-point reached?
+                  (throw 'found nil)
+                (setq root proot))))
+          nil)))))
+
+(defun haskell-cabal-find-pkg-desc (dir &optional allow-multiple)
+  "Find a package description file in the directory DIR.
+Returns nil if none or multiple \".cabal\" files were found.  If
+ALLOW-MULTIPLE is non nil, in case of multiple \".cabal\" files,
+a list is returned instead of failing with a nil result."
+  ;; This is basically a port of Cabal's
+  ;; Distribution.Simple.Utils.findPackageDesc function
+  ;;  http://hackage.haskell.org/packages/archive/Cabal/1.16.0.3/doc/html/Distribution-Simple-Utils.html
+  ;; but without the exception throwing.
+  (let* ((cabal-files
+          (cl-remove-if 'file-directory-p
+                        (cl-remove-if-not 'file-exists-p
+                                          (directory-files dir t ".\\.cabal\\'")))))
+    (cond
+     ((= (length cabal-files) 1) (car cabal-files)) ;; exactly one candidate found
+     (allow-multiple cabal-files) ;; pass-thru multiple candidates
+     (t nil))))
+
+(defun haskell-cabal-find-dir (&optional dir)
+  "Like `haskell-cabal-find-file' but returns directory instead.
+See `haskell-cabal-find-file' for meaning of DIR argument."
+  (let ((cabal-file (haskell-cabal-find-file dir)))
+    (when cabal-file
+      (file-name-directory cabal-file))))
+
+;;;###autoload
+(defun haskell-cabal-visit-file (other-window)
+  "Locate and visit package description file for file visited by current buffer.
+This uses `haskell-cabal-find-file' to locate the closest
+\".cabal\" file and open it.  This command assumes a common Cabal
+project structure where the \".cabal\" file is in the top-folder
+of the project, and all files related to the project are in or
+below the top-folder.  If called with non-nil prefix argument
+OTHER-WINDOW use `find-file-other-window'."
+  (interactive "P")
+  ;; Note: We aren't allowed to rely on haskell-session here (which,
+  ;; in pathological cases, can have a different .cabal file
+  ;; associated with the current buffer)
+  (if buffer-file-name
+      (let ((cabal-file (haskell-cabal-find-file (file-name-directory buffer-file-name))))
+        (if cabal-file
+            (if other-window
+                (find-file-other-window cabal-file)
+              (find-file cabal-file))
+          (error "Could not locate \".cabal\" file for %S" buffer-file-name)))
+    (error "Cannot locate \".cabal\" file for buffers not visiting any file")))
+
+(defvar haskell-cabal-commands
+  '("install"
+    "update"
+    "list"
+    "info"
+    "upgrade"
+    "fetch"
+    "unpack"
+    "check"
+    "sdist"
+    "upload"
+    "report"
+    "init"
+    "configure"
+    "build"
+    "copy"
+    "haddock"
+    "clean"
+    "hscolour"
+    "register"
+    "test"
+    "help"
+    "run"))
+
+;;;###autoload
+(defgroup haskell-cabal nil
+  "Haskell cabal files"
+  :group 'haskell
+)
+
+(defconst haskell-cabal-section-header-regexp "^[[:alnum:]]" )
+(defconst haskell-cabal-subsection-header-regexp "^[ \t]*[[:alnum:]]\\w*:")
+(defconst haskell-cabal-comment-regexp "^[ \t]*--")
+(defconst haskell-cabal-empty-regexp "^[ \t]*$")
+(defconst haskell-cabal-conditional-regexp "^[ \t]*\\(\\if\\|else\\|}\\)")
+
+(defun haskell-cabal-classify-line ()
+  "Classify the current line into 'section-header 'subsection-header 'section-data 'comment and 'empty '"
+  (save-excursion
+    (beginning-of-line)
+    (cond
+     ((looking-at haskell-cabal-subsection-header-regexp ) 'subsection-header)
+     ((looking-at haskell-cabal-section-header-regexp) 'section-header)
+     ((looking-at haskell-cabal-comment-regexp) 'comment)
+     ((looking-at haskell-cabal-empty-regexp ) 'empty)
+     ((looking-at haskell-cabal-conditional-regexp ) 'conditional)
+     (t 'section-data))))
+
+(defun haskell-cabal-header-p ()
+  "Is the current line a section or subsection header?"
+  (cl-case (haskell-cabal-classify-line)
+    ((section-header subsection-header) t)))
+
+(defun haskell-cabal-section-header-p ()
+  "Is the current line a section or subsection header?"
+  (cl-case (haskell-cabal-classify-line)
+    ((section-header) t)))
+
+
+(defun haskell-cabal-section-beginning ()
+  "Find the beginning of the current section"
+  (save-excursion
+    (while (not (or (bobp) (haskell-cabal-section-header-p)))
+      (forward-line -1))
+    (point)))
+
+(defun haskell-cabal-beginning-of-section ()
+  "go to the beginning of the section"
+  (interactive)
+  (goto-char (haskell-cabal-section-beginning))
+)
+
+(defun haskell-cabal-section-end ()
+  "Find the end of the current section"
+  (interactive)
+  (save-excursion
+    (if (re-search-forward "\n\\([ \t]*\n\\)*[[:alnum:]]" nil t)
+        (match-beginning 0)
+        (point-max))))
+
+(defun haskell-cabal-end-of-section ()
+  "go to the end of the section"
+  (interactive)
+  (goto-char (haskell-cabal-section-end)))
+
+(defun haskell-cabal-next-section ()
+  "Go to the next section"
+  (interactive)
+  (when (haskell-cabal-section-header-p) (forward-line))
+  (while (not (or (eobp) (haskell-cabal-section-header-p)))
+    (forward-line)))
+
+(defun haskell-cabal-previous-section ()
+  "Go to the next section"
+  (interactive)
+  (when (haskell-cabal-section-header-p) (forward-line -1))
+  (while (not (or (bobp) (haskell-cabal-section-header-p)))
+    (forward-line -1)))
+
+(defun haskell-cabal-subsection-end ()
+  "find the end of the current subsection"
+  (save-excursion
+    (haskell-cabal-beginning-of-subsection)
+    (forward-line)
+    (while (and (not (eobp))
+                (member (haskell-cabal-classify-line) '(empty section-data)))
+      (forward-line))
+    (unless (eobp) (forward-line -1))
+    (while (and (equal (haskell-cabal-classify-line) 'empty)
+                (not (bobp)))
+      (forward-line -1))
+    (end-of-line)
+    (point)))
+
+(defun haskell-cabal-end-of-subsection ()
+  "go to the end of the current subsection"
+  (interactive)
+  (goto-char (haskell-cabal-subsection-end)))
+
+(defun haskell-cabal-section ()
+  "Get the name and data of the associated section"
+  (save-excursion
+    (haskell-cabal-beginning-of-section)
+    (when (and (haskell-cabal-section-header-p)
+               (looking-at "^\\(\\w+\\)[ \t]*\\(.*\\)$"))
+      (list :name (match-string-no-properties 1)
+            :value (match-string-no-properties 2)
+            :beginning (match-beginning 0)
+            :end (haskell-cabal-section-end)))))
+
+
+(defun haskell-cabal-subsection ()
+  "Get the name and bounds of of the current subsection"
+  (save-excursion
+    (haskell-cabal-beginning-of-subsection)
+    (when (looking-at "\\([ \t]*\\(\\w*\\):\\)[ \t]*")
+      (list :name (match-string-no-properties 2)
+            :beginning (match-end 0)
+            :end (save-match-data (haskell-cabal-subsection-end))
+            :data-start-column (save-excursion (goto-char (match-end 0))
+                                               (current-column)
+                                               )))))
+
+
+(defun haskell-cabal-section-name (section)
+  (plist-get section :name))
+
+(defun haskell-cabal-section-value (section)
+  (plist-get section :value))
+
+(defun haskell-cabal-section-start (section)
+  (plist-get section :beginning))
+
+(defun haskell-cabal-section-data-start-column (section)
+  (plist-get section :data-start-column))
+
+(defun haskell-cabal-map-component-type (component-type)
+  "Map from cabal file COMPONENT-TYPE to build command component-type."
+  (let ((component-type (downcase component-type)))
+    (cond ((equal component-type "executable") "exe")
+          ((equal component-type "test-suite") "test")
+          ((equal component-type "benchmark")  "bench"))))
+
+(defun haskell-cabal-enum-targets (&optional process-type)
+  "Enumerate .cabal targets. PROCESS-TYPE determines the format of the returned target."
+  (let ((cabal-file (haskell-cabal-find-file))
+        (process-type (if process-type process-type 'ghci)))
+    (when (and cabal-file (file-readable-p cabal-file))
+      (with-temp-buffer
+        (insert-file-contents cabal-file)
+        (haskell-cabal-mode)
+        (goto-char (point-min))
+        (let ((matches)
+              (package-name (haskell-cabal--get-field "name")))
+          (haskell-cabal-next-section)
+          (while (not (eobp))
+            (if (haskell-cabal-source-section-p (haskell-cabal-section))
+                (let* ((section (haskell-cabal-section))
+                       (component-type (haskell-cabal-section-name section))
+                       (val (car (split-string
+                                  (haskell-cabal-section-value section)))))
+                  (if (equal (downcase component-type) "library")
+                      (let ((lib-target (if (eq 'stack-ghci process-type)
+                                            (concat package-name ":lib")
+                                          (concat "lib:" package-name))))
+                        (push lib-target matches))
+                    (push (concat  (when (eq 'stack-ghci process-type)
+                                     (concat package-name ":"))
+                                   (haskell-cabal-map-component-type component-type)
+                                   ":"
+                                   val)
+                          matches))))
+            (haskell-cabal-next-section))
+          (reverse matches))))))
+
+(defmacro haskell-cabal-with-subsection (subsection replace &rest funs)
+  "Copy subsection data into a temporary buffer, save indentation
+and execute FORMS
+
+If REPLACE is non-nil the subsection data is replaced with the
+resulting buffer-content"
+  (let ((section (make-symbol "section"))
+        (beg (make-symbol "beg"))
+        (end (make-symbol "end"))
+        (start-col (make-symbol "start-col"))
+        (section-data (make-symbol "section-data")))
+    `(let* ((,section ,subsection)
+            (,beg (plist-get ,section :beginning))
+            (,end (plist-get ,section :end))
+            (,start-col (plist-get ,section :data-start-column))
+            (,section-data (buffer-substring ,beg ,end)))
+       (save-excursion
+         (prog1
+             (with-temp-buffer
+               (setq indent-tabs-mode nil)
+               (indent-to ,start-col)
+               (insert ,section-data)
+               (goto-char (point-min))
+               (prog1
+                   (progn (haskell-cabal-save-indentation ,@funs))
+                 (goto-char (point-min))
+                 (when (looking-at (format "[ ]\\{0,%d\\}" (1+ ,start-col)))
+                     (replace-match ""))
+
+                 (setq ,section-data (buffer-substring (point-min) (point-max)))))
+           ,@(when replace
+               `((delete-region ,beg ,end)
+                 (goto-char ,beg)
+                 (insert ,section-data))))))))
+
+(defmacro haskell-cabal-each-line (&rest fun)
+  "Execute FORMS on each line"
+  `(save-excursion
+     (while (< (point) (point-max))
+       ,@fun
+       (forward-line))))
+
+(defun haskell-cabal-chomp-line ()
+  "Remove leading and trailing whitespaces from current line"
+  (beginning-of-line)
+  (when (looking-at "^[ \t]*\\([^ \t]\\|\\(?:[^ \t].*[^ \t]\\)\\)[ \t]*$")
+    (replace-match (match-string 1) nil t)
+    t))
+
+
+(defun haskell-cabal-min-indentation (&optional beg end)
+  "Compute largest common whitespace prefix of each line in between BEG and END"
+  (save-excursion
+    (goto-char (or beg (point-min)))
+    (let ((min-indent nil))
+      (while (< (point) (or end (point-max)))
+        (let ((indent (current-indentation)))
+          (if (and (not (haskell-cabal-ignore-line-p))
+                   (or (not min-indent)
+                       (< indent min-indent)))
+              (setq min-indent indent)))
+        (forward-line))
+      min-indent)))
+
+(defun haskell-cabal-ignore-line-p ()
+  "Does line only contain whitespaces and comments?"
+  (save-excursion
+    (beginning-of-line)
+    (looking-at "^[ \t]*\\(?:--.*\\)?$")))
+
+(defun haskell-cabal-kill-indentation ()
+  "Remove longest common whitespace prefix from each line"
+  (goto-char (point-min))
+  (let ((indent (haskell-cabal-min-indentation)))
+    (haskell-cabal-each-line (unless (haskell-cabal-ignore-line-p)
+                               (delete-char indent)) )
+    indent))
+
+(defun haskell-cabal-add-indentation (indent)
+  (goto-char (point-min))
+  (haskell-cabal-each-line
+   (unless (haskell-cabal-ignore-line-p)
+     (indent-to indent))))
+
+
+(defmacro haskell-cabal-save-indentation (&rest funs)
+  "Strip indentation from each line, execute FORMS and reinstate indentation
+   so that the indentation of the FIRST LINE matches"
+  (let ((old-l1-indent (make-symbol "new-l1-indent"))
+        (new-l1-indent (make-symbol "old-l1-indent")))
+    `(let ( (,old-l1-indent (save-excursion
+                              (goto-char (point-min))
+                              (current-indentation))))
+       (unwind-protect
+           (progn
+             (haskell-cabal-kill-indentation)
+             ,@funs)
+         (progn
+           (goto-char (point-min))
+           (let ((,new-l1-indent (current-indentation)))
+             (haskell-cabal-add-indentation (- ,old-l1-indent
+                                           ,new-l1-indent))))))))
+
+(defun haskell-cabal-comma-separatorp (pos)
+  "Return non-nil when the char at POS is a comma separator.
+Characters that are not a comma, or commas inside a commment or
+string, are not comma separators."
+  (when (eq (char-after pos) ?,)
+    (let ((ss (syntax-ppss pos)))
+      (not
+       (or
+        ;; inside a string
+        (nth 3 ss)
+        ;; inside a comment
+        (nth 4 ss))))))
+
+(defun haskell-cabal-strip-list-and-detect-style ()
+  "Strip commas from a comma-separated list.
+Detect and return the comma style.  The possible options are:
+
+before: a comma at the start of each line (except the first), e.g.
+    Foo
+  , Bar
+
+after: a comma at the end of each line (except the last), e.g.
+    Foo,
+    Bar
+
+single: everything on a single line, but comma-separated, e.g.
+    Foo, Bar
+
+nil: no commas, e.g.
+    Foo Bar
+
+If the styles are mixed, the position of the first comma
+determines the style. If there is only one element then `after'
+style is assumed."
+  (let (comma-style)
+    ;; split list items on single line
+    (goto-char (point-min))
+    (while (re-search-forward
+            "\\([^ \t,\n]\\)[ \t]*\\(,\\)[ \t]*\\([^ \t,\n]\\)" nil t)
+      (when (haskell-cabal-comma-separatorp (match-beginning 2))
+        (setq comma-style 'single)
+        (replace-match "\\1\n\\3" nil nil)))
+    ;; remove commas before
+    (goto-char (point-min))
+    (while (re-search-forward "^\\([ \t]*\\),\\([ \t]*\\)" nil t)
+      (setq comma-style 'before)
+      (replace-match "" nil nil))
+    ;; remove trailing commas
+    (goto-char (point-min))
+    (while (re-search-forward ",[ \t]*$" nil t)
+      (unless (eq comma-style 'before)
+        (setq comma-style 'after))
+      (replace-match "" nil nil))
+
+    ;; if there is just one line then set default as 'after
+    (unless comma-style
+      (goto-char (point-min))
+      (forward-line)
+      (when (eobp)
+        (setq comma-style 'after)))
+    (goto-char (point-min))
+
+    (haskell-cabal-each-line (haskell-cabal-chomp-line))
+    comma-style))
+
+(defun haskell-cabal-listify (comma-style)
+  "Add commas so that the buffer contains a comma-separated list.
+Respect the COMMA-STYLE, see
+`haskell-cabal-strip-list-and-detect-style' for the possible
+styles."
+  (cl-case comma-style
+    ('before
+     (goto-char (point-min))
+     (while (haskell-cabal-ignore-line-p) (forward-line))
+     (indent-to 2)
+     (forward-line)
+     (haskell-cabal-each-line
+      (unless (haskell-cabal-ignore-line-p)
+        (insert ", "))))
+    ('after
+     (goto-char (point-max))
+     (while (equal 0 (forward-line -1))
+       (unless (haskell-cabal-ignore-line-p)
+         (end-of-line)
+         (insert ",")
+         (beginning-of-line))))
+    ('single
+     (goto-char (point-min))
+     (while (not (eobp))
+       (end-of-line)
+       (unless (eobp)
+         (insert ", ")
+         (delete-char 1)
+         (just-one-space))))))
+
+(defmacro haskell-cabal-with-cs-list (&rest funs)
+  "Format the buffer so that each line contains a list element.
+Respect the comma style."
+  (let ((comma-style (make-symbol "comma-style")))
+    `(let ((,comma-style
+            (save-excursion
+              (haskell-cabal-strip-list-and-detect-style))))
+       (unwind-protect (progn ,@funs)
+         (haskell-cabal-listify ,comma-style)))))
+
+
+(defun haskell-cabal-sort-lines-key-fun ()
+  (when (looking-at "[ \t]*--[ \t,]*")
+    (goto-char (match-end 0)))
+  nil)
+
+(defmacro haskell-cabal-save-position (&rest forms)
+  "Save position as mark, execute FORMs and go back to mark"
+  `(prog2
+       (haskell-cabal-mark)
+       (progn ,@forms)
+     (haskell-cabal-goto-mark)
+     (haskell-cabal-remove-mark)))
+
+(defun haskell-cabal-sort-lines-depends-compare (key1 key2)
+  (let* ((key1str (buffer-substring (car key1) (cdr key1)))
+         (key2str (buffer-substring (car key2) (cdr key2)))
+         (base-regex "^[ \t]*base\\($\\|[^[:alnum:]-]\\)"))
+    (cond
+     ((string-match base-regex key1str) t)
+     ((string-match base-regex key2str) nil)
+     (t (string< key1str key2str)))))
+
+(defun haskell-cabal-subsection-arrange-lines ()
+  "Sort lines of current subsection"
+  (interactive)
+  (haskell-cabal-save-position
+   (let* ((subsection (haskell-cabal-section-name (haskell-cabal-subsection)))
+          (compare-lines (if (string= (downcase subsection) "build-depends")
+                            'haskell-cabal-sort-lines-depends-compare
+                          nil)))
+     (haskell-cabal-with-subsection
+      (haskell-cabal-subsection) t
+      (haskell-cabal-with-cs-list
+       (sort-subr nil 'forward-line 'end-of-line
+                  'haskell-cabal-sort-lines-key-fun
+                  'end-of-line
+                  compare-lines
+                  ))))))
+
+(defun haskell-cabal-subsection-beginning ()
+  "find the beginning of the current subsection"
+  (save-excursion
+    (while (and (not (bobp))
+                (not (haskell-cabal-header-p)))
+      (forward-line -1))
+    (back-to-indentation)
+    (point)))
+
+(defun haskell-cabal-beginning-of-subsection ()
+  "go to the beginning of the current subsection"
+  (interactive)
+  (goto-char (haskell-cabal-subsection-beginning)))
+
+(defun haskell-cabal-next-subsection ()
+  "go to the next subsection"
+  (interactive)
+  (if (haskell-cabal-header-p) (forward-line))
+  (while (and (not (eobp))
+              (not (haskell-cabal-header-p)))
+    (forward-line))
+  (haskell-cabal-forward-to-line-entry))
+
+(defun haskell-cabal-previous-subsection ()
+  "go to the previous subsection"
+  (interactive)
+  (if (haskell-cabal-header-p) (forward-line -1))
+  (while (and (not (bobp))
+              (not (haskell-cabal-header-p)))
+    (forward-line -1))
+  (haskell-cabal-forward-to-line-entry)
+  )
+
+
+(defun haskell-cabal-find-subsection-by (section pred)
+  "Find subsection with name NAME"
+  (save-excursion
+    (when section (goto-char (haskell-cabal-section-start section)))
+    (let* ((end (if section (haskell-cabal-section-end) (point-max)))
+           (found nil))
+      (while (and (< (point) end)
+                  (not found))
+        (let ((subsection (haskell-cabal-subsection)))
+          (when (and subsection (funcall pred subsection))
+            (setq found subsection)))
+        (haskell-cabal-next-subsection))
+      found)))
+
+(defun haskell-cabal-find-subsection (section name)
+  "Find subsection with name NAME"
+  (let ((downcase-name (downcase name)))
+    (haskell-cabal-find-subsection-by
+     section
+     `(lambda (subsection)
+        (string= (downcase (haskell-cabal-section-name subsection))
+                 ,downcase-name)))))
+
+(defun haskell-cabal-goto-subsection (name)
+  (let ((subsection (haskell-cabal-find-subsection (haskell-cabal-section) name)))
+    (when subsection
+      (goto-char (haskell-cabal-section-start subsection)))))
+
+(defun haskell-cabal-goto-exposed-modules ()
+  (interactive)
+  (haskell-cabal-goto-subsection "exposed-modules"))
+
+(defun haskell-cabal-subsection-entry-list (section name)
+  "Get the data of a subsection as a list"
+  (let ((subsection (haskell-cabal-find-subsection section name)))
+    (when subsection
+      (haskell-cabal-with-subsection
+       subsection nil
+       (haskell-cabal-with-cs-list
+        (delete-matching-lines
+         (format "\\(?:%s\\)\\|\\(?:%s\\)"
+                 haskell-cabal-comment-regexp
+                 haskell-cabal-empty-regexp)
+         (point-min) (point-max))
+        (split-string (buffer-substring-no-properties (point-min) (point-max))
+                      "\n" t))))))
+
+(defun haskell-cabal-remove-mark ()
+  (remove-list-of-text-properties (point-min) (point-max)
+                                  '(haskell-cabal-marker)))
+
+
+(defun haskell-cabal-mark ()
+  "Mark the current position with the text property haskell-cabal-marker"
+  (haskell-cabal-remove-mark)
+  (put-text-property (line-beginning-position) (line-end-position)
+                     'haskell-cabal-marker 'marked-line)
+  (put-text-property (point) (1+ (point))
+                     'haskell-cabal-marker 'marked))
+
+
+(defun haskell-cabal-goto-mark ()
+  "Go to marked line"
+  (let ((marked-pos (text-property-any (point-min) (point-max)
+                                       'haskell-cabal-marker
+                                       'marked))
+        (marked-line (text-property-any (point-min) (point-max)
+                                       'haskell-cabal-marker
+                                       'marked-line) )
+        )
+    (cond (marked-pos (goto-char marked-pos))
+          (marked-line (goto-char marked-line)))))
+
+(defmacro haskell-cabal-with-subsection-line (replace &rest forms)
+  "Mark line, copy subsection data into a temporary buffer, save indentation
+and execute FORMS at the marked line.
+
+If REPLACE is non-nil the subsection data is replaced with the
+resulting buffer-content.  Unmark line at the end."
+  `(progn
+     (haskell-cabal-mark)
+     (unwind-protect
+         (haskell-cabal-with-subsection (haskell-cabal-subsection) ,replace
+          (haskell-cabal-goto-mark)
+          ,@forms)
+       (haskell-cabal-remove-mark))))
+
+
+(defun haskell-cabal-get-line-content ()
+  (haskell-cabal-with-subsection-line
+   nil
+   (haskell-cabal-with-cs-list
+    (haskell-cabal-goto-mark)
+    (buffer-substring-no-properties (line-beginning-position)
+                                    (line-end-position)))))
+
+(defun haskell-cabal-module-to-filename (module)
+  (concat (replace-regexp-in-string "[.]" "/" module ) ".hs"))
+
+(defconst haskell-cabal-module-sections '("exposed-modules" "other-modules")
+  "List of sections that contain module names"
+)
+
+(defconst haskell-cabal-file-sections
+  '("main-is" "c-sources" "data-files" "extra-source-files"
+    "extra-doc-files" "extra-tmp-files" )
+  "List of subsections that contain filenames"
+  )
+
+(defconst haskell-cabal-source-bearing-sections
+  '("library" "executable" "test-suite" "benchmark"))
+
+(defun haskell-cabal-source-section-p (section)
+  (not (not (member (downcase (haskell-cabal-section-name section))
+                    haskell-cabal-source-bearing-sections))))
+
+(defun haskell-cabal-line-filename ()
+  "Expand filename in current line according to the subsection type
+
+Module names in exposed-modules and other-modules are expanded by replacing each dot (.) in the module name with a foward slash (/) and appending \".hs\"
+
+Example: Foo.Bar.Quux ==> Foo/Bar/Quux.hs
+
+Source names from main-is and c-sources sections are left untouched
+
+"
+  (let ((entry (haskell-cabal-get-line-content))
+        (subsection (downcase (haskell-cabal-section-name
+                               (haskell-cabal-subsection)))))
+    (cond ((member subsection haskell-cabal-module-sections)
+           (haskell-cabal-module-to-filename entry))
+          ((member subsection haskell-cabal-file-sections) entry))))
+
+(defun haskell-cabal-join-paths (&rest args)
+  "Crude hack to replace f-join"
+  (mapconcat 'identity args "/")
+)
+
+(defun haskell-cabal-find-or-create-source-file ()
+  "Open the source file this line refers to."
+  (interactive)
+  (let* ((src-dirs (append (haskell-cabal-subsection-entry-list
+                            (haskell-cabal-section) "hs-source-dirs")
+                           '("")))
+         (base-dir (file-name-directory (buffer-file-name)))
+         (filename (haskell-cabal-line-filename)))
+    (when filename
+      (let ((candidates
+             (delq nil (mapcar
+                        (lambda (dir)
+                          (let ((file (haskell-cabal-join-paths base-dir
+                                                                dir
+                                                                filename)))
+                            (when (and (file-readable-p file)
+                                       (not (file-directory-p file)))
+                              file)))
+                        src-dirs))))
+        (if (null candidates)
+            (unwind-protect
+                (progn
+                  (haskell-mode-toggle-interactive-prompt-state)
+                  (let* ((src-dir
+                          (haskell-cabal-join-paths base-dir
+                                                    (or (car src-dirs) "")))
+                         (newfile (haskell-cabal-join-paths src-dir filename))
+                         (do-create-p (y-or-n-p (format "Create file %s ?" newfile))))
+                    (when do-create-p
+                      (find-file-other-window newfile ))))
+              (haskell-mode-toggle-interactive-prompt-state t))
+          (find-file-other-window (car candidates)))))))
+
+
+(defun haskell-cabal-find-section-type (type &optional wrap)
+  (save-excursion
+    (haskell-cabal-next-section)
+    (while
+        (not
+         (or
+          (eobp)
+          (string=
+           (downcase type)
+           (downcase (haskell-cabal-section-name (haskell-cabal-section))))))
+      (haskell-cabal-next-section))
+    (if (eobp)
+      (if wrap (progn
+                 (goto-char (point-min))
+                 (haskell-cabal-find-section-type type nil) )
+        nil)
+      (point))))
+
+(defun haskell-cabal-goto-section-type (type)
+  (let ((section (haskell-cabal-find-section-type type t)))
+    (if section (goto-char section)
+      (message "No %s section found" type))))
+
+(defun haskell-cabal-goto-library-section ()
+  (interactive)
+  (haskell-cabal-goto-section-type "library"))
+
+(defun haskell-cabal-goto-test-suite-section ()
+  (interactive)
+  (haskell-cabal-goto-section-type "test-suite"))
+
+(defun haskell-cabal-goto-executable-section ()
+  (interactive)
+  (haskell-cabal-goto-section-type "executable"))
+
+(defun haskell-cabal-goto-benchmark-section ()
+  (interactive)
+  (haskell-cabal-goto-section-type "benchmark"))
+
+
+
+(defun haskell-cabal-line-entry-column ()
+  "Column at which the line entry starts"
+  (save-excursion
+    (cl-case (haskell-cabal-classify-line)
+      (section-data (beginning-of-line)
+                    (when (looking-at "[ ]*\\(?:,[ ]*\\)?")
+                      (goto-char (match-end 0))
+                      (current-column)))
+      (subsection-header
+       (haskell-cabal-section-data-start-column (haskell-cabal-subsection))))))
+
+(defun haskell-cabal-forward-to-line-entry ()
+  "go forward to the beginning of the line entry (but never move backwards)"
+  (let ((col (haskell-cabal-line-entry-column)))
+    (when (and col (< (current-column) col))
+      (beginning-of-line)
+      (forward-char col))))
+
+(defun haskell-cabal-indent-line ()
+  "Indent current line according to subsection"
+  (interactive)
+  (cl-case (haskell-cabal-classify-line)
+    (section-data
+     (save-excursion
+       (let ((indent (haskell-cabal-section-data-start-column
+                      (haskell-cabal-subsection))))
+         (indent-line-to indent)
+         (beginning-of-line)
+         (when (looking-at "[ ]*\\([ ]\\{2\\},[ ]*\\)")
+           (replace-match ", " t t nil 1)))))
+    (empty
+     (indent-relative)))
+  (haskell-cabal-forward-to-line-entry))
+
+(defun haskell-cabal-map-sections (fun)
+  "Execute fun over each section, collecting the result"
+  (save-excursion
+    (goto-char (point-min))
+    (let ((results nil))
+        (while (not (eobp))
+          (let* ((section (haskell-cabal-section))
+                 (result (and section (funcall fun (haskell-cabal-section)))))
+            (when section (setq results (cons result results))))
+          (haskell-cabal-next-section))
+        (nreverse results))))
+
+(defun haskell-cabal-section-add-build-dependency (dependency &optional sort sec)
+  "Add a build dependency to the build-depends section"
+  (let* ((section (or sec (haskell-cabal-section)))
+         (subsection (and section
+                          (haskell-cabal-find-subsection section "build-depends"))))
+    (when subsection
+      (haskell-cabal-with-subsection
+       subsection t
+       (haskell-cabal-with-cs-list
+        (insert dependency)
+        (insert "\n")
+        (when sort
+          (goto-char (point-min))
+          (sort-subr nil 'forward-line 'end-of-line
+                     'haskell-cabal-sort-lines-key-fun)))))))
+
+(defun haskell-cabal-add-build-dependency (dependency &optional sort silent)
+  "Add the given DEPENDENCY to every section in cabal file.
+If SORT argument is given sort dependencies in section after update.
+Pass SILENT argument to update all sections without asking user."
+  (haskell-cabal-map-sections
+   (lambda (section)
+     (when (haskell-cabal-source-section-p section)
+       (unwind-protect
+           (progn
+             (when
+                 (or silent
+                     (y-or-n-p (format "Add dependency %s to %s section %s?"
+                                       dependency
+                                       (haskell-cabal-section-name section)
+                                       (haskell-cabal-section-value section))))
+               (haskell-cabal-section-add-build-dependency dependency
+                                                           sort
+                                                           section))
+             nil)
+         (haskell-mode-toggle-interactive-prompt-state t))))))
+
+(defun haskell-cabal-add-dependency
+    (package &optional version no-prompt sort silent)
+  "Add PACKAGE to the cabal file.
+If VERSION is non-nil it will be appended as a minimum version.
+If NO-PROMPT is nil the minimum package version is read from the
+minibuffer.  When SORT is non-nil the package entries are sorted
+afterwards.  If SILENT is non-nil the user is prompted for each
+source-section."
+  (interactive
+   (list (read-from-minibuffer "Package entry: ") nil t t nil))
+  (haskell-mode-toggle-interactive-prompt-state)
+  (unwind-protect
+      (save-window-excursion
+        (find-file-other-window (haskell-cabal-find-file))
+        (let ((entry (if no-prompt package
+                       (read-from-minibuffer
+                        "Package entry: "
+                        (concat package
+                                (if version (concat " >= " version) ""))))))
+          (haskell-cabal-add-build-dependency entry sort silent)
+          (when (or silent (y-or-n-p "Save cabal file? "))
+            (save-buffer))))
+    ;; unwind
+    (haskell-mode-toggle-interactive-prompt-state t)))
+
+
+(defun haskell-cabal--find-tags-dir ()
+  "Return a directory where TAGS file will be generated.
+Tries to find cabal file first and if succeeds uses its location.
+If cabal file not found uses current file directory.  If current
+buffer not visiting a file returns nil."
+  (or (haskell-cabal-find-dir)
+      (when buffer-file-name
+        (file-name-directory buffer-file-name))))
+
+(defun haskell-cabal--compose-hasktags-command (dir)
+  "Prepare command to execute `hasktags` command in DIR folder.
+
+To customise the command executed, see `haskell-hasktags-path'
+and `haskell-hasktags-arguments'.
+
+This function takes into account the user's operating system: in case
+of Windows it generates a simple command, relying on Hasktags
+itself to find source files:
+
+hasktags --output=DIR\TAGS -x -e DIR
+
+In other cases it uses `find` command to find all source files
+recursively avoiding visiting unnecessary heavy directories like
+.git, .svn, _darcs and build directories created by
+cabal-install, stack, etc and passes list of found files to Hasktags."
+  (if (eq system-type 'windows-nt)
+      (format "%s --output=%s %s %s"
+              haskell-hasktags-path
+              (shell-quote-argument (expand-file-name "TAGS" dir))
+              (mapconcat #'identity haskell-hasktags-arguments " ")
+              (shell-quote-argument dir))
+    (format "cd %s && %s | %s"
+            (shell-quote-argument dir)
+            (concat "find . "
+                    "-type d \\( "
+                    "-path ./.git "
+                    "-o -path ./.svn "
+                    "-o -path ./_darcs "
+                    "-o -path ./.stack-work "
+                    "-o -path ./dist "
+                    "-o -path ./.cabal-sandbox "
+                    "\\) -prune "
+                    "-o -type f \\( "
+                    "-name '*.hs' "
+                    "-or -name '*.lhs' "
+                    "-or -name '*.hsc' "
+                    "\\) -not \\( "
+                    "-name '#*' "
+                    "-or -name '.*' "
+                    "\\) -print0")
+            (format "xargs -0 %s %s"
+                    (shell-quote-argument haskell-hasktags-path)
+                    (mapconcat #'identity haskell-hasktags-arguments " ")))))
+
+(provide 'haskell-cabal)
+;;; haskell-cabal.el ends here