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+;;; evil-text-objects-haskell.el --- Text objects for Haskell source code
+;; Package-Version: 20180316.1833
+
+;;; License:
+
+;; Copyright (C) 2018 Off Market Data, Inc. DBA Urbint
+;; Permission is hereby granted, free of charge, to any person obtaining a copy
+;; of this software and associated documentation files (the "Software"), to
+;; deal in the Software without restriction, including without limitation the
+;; rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+;; sell copies of the Software, and to permit persons to whom the Software is
+;; furnished to do so, subject to the following conditions:
+;;
+;; The above copyright notice and this permission notice shall be included in
+;; all copies or substantial portions of the Software.
+;;
+;; THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+;; IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+;; FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+;; AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+;; LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+;; FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+;; IN THE SOFTWARE.
+
+;;; Commentary:
+
+;; evil-text-objects-haskell provides text-object definitions that
+;; should make working with Haskell in Emacs more enjoyable.
+;;
+;; Currently supporting:
+;;   - functions
+;;   - multi-line comments
+;;
+;; See the README.md for installation instructions.
+
+(require 'evil)
+(require 'pcre2el)
+(require 'dash)
+(require 'bind-key)
+
+;;; Code:
+
+;; Helper Functions
+(defun string-symbol-at-point ()
+  "Return a string version of the symbol at point after stripping away
+after all of the text properties."
+  (->
+   (symbol-at-point)
+   symbol-name
+   substring-no-properties))
+
+;; multi-line comments
+(evil-define-text-object
+  evil-inner-haskell-comment-block (count &optional beg end type)
+  "Inner text object for a Haskell comment block."
+  (let ((beg (save-excursion
+               (search-backward "{-")
+               (right-char 2)
+               (point)))
+        (end (save-excursion
+               (search-forward  "-}")
+               (left-char 2)
+               (point))))
+    (evil-range beg end type)))
+
+(evil-define-text-object
+  evil-outer-haskell-comment-block (count &optional beg end type)
+  "Outer text object for a Haskell comment block."
+  (let ((beg (save-excursion
+               (search-backward "{-")
+               (point)))
+        (end (save-excursion
+               (search-forward  "-}")
+               (point))))
+    (evil-range beg end type)))
+
+;; functions
+(evil-define-text-object
+  evil-inner-haskell-function (count &optional beg end type)
+  "Inner text object for a Haskell function."
+  (evil-range 0 0 type))
+
+(evil-define-text-object
+  evil-outer-haskell-function (count &optional beg end type)
+  "Outer text object for a Haskell function."
+  (beginning-of-line)
+  (when (looking-at "--")
+    (while (looking-at "--")
+      (forward-line -1)))
+  (when (looking-at "[[:space:]]")
+    (while (looking-at "[[:space:]]")
+      (forward-line -1)))
+  (let* ((fn-name (save-excursion
+                    (search-backward-regexp "^\\w")
+                    (string-symbol-at-point)))
+         (fn-name-regexp (concat "^" fn-name "\\b"))
+         (end (save-excursion
+                (while (search-forward-regexp fn-name-regexp nil t))
+                (unless (search-forward-regexp "^\\w" nil t)
+                  (goto-char (point-max)))
+                (search-backward-regexp "^[[:space:]]+[^ ]")
+                (end-of-line)
+                (point)))
+         (beg (save-excursion
+                (goto-char end)
+                (while (search-backward-regexp fn-name-regexp nil t))
+                (beginning-of-line)
+                (forward-line -1)
+                (while (looking-at "--")
+                  (forward-line -1))
+                (point))))
+    (evil-range beg end type)))
+
+;; Installation Helper
+(defun evil-text-objects-haskell/install ()
+  "Register keybindings for the text objects defined herein.  It is
+recommended to run this after something like `haskell-mode-hook'.  See
+README.md for additional information."
+  (bind-keys :map evil-operator-state-local-map
+             ("af" . evil-outer-haskell-function)
+             ("if" . evil-inner-haskell-function)
+             ("iC" . evil-inner-haskell-comment-block)
+             ("aC" . evil-outer-haskell-comment-block))
+  (bind-keys :map evil-visual-state-local-map
+             ("af" . evil-outer-haskell-function)
+             ("if" . evil-inner-haskell-function)
+             ("iC" . evil-inner-haskell-comment-block)
+             ("aC" . evil-outer-haskell-comment-block)))
+
+(provide 'evil-text-objects-haskell)
+
+;;; evil-text-objects-haskell.el ends here