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+;;; haskell-utils.el --- General utility functions used by haskell-mode modules -*- lexical-binding: t -*-
+
+;; Copyright © 2013 Herbert Valerio Riedel
+;;             2016 Arthur Fayzrakhmanov
+
+;; Author: Herbert Valerio Riedel <hvr@gnu.org>
+
+;; 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 of the License, 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 this program.  If not, see <http://www.gnu.org/licenses/>.
+
+;;; Commentary:
+
+;; This module's purpose is to provide a place for helper functions
+;; which are general enough to be usable by multiple modules and/or
+;; to alleviate circular module dependency problems.
+;;
+;; When possible, functions in this module shall be accompanied by
+;; ERT-based unit tests.
+;;
+;; See also `haskell-str.el' for string utility functions.
+;;
+;; All symbols in this module have a `haskell-utils-' prefix.
+
+;;; Code:
+
+;; =============================================================================
+;;                                     NOTE:
+;; THIS MODULE IS SUPPOSED TO BE A LEAF-MODULE AND SHALL NOT REQUIRE/DEPEND-ON
+;; ANY OTHER HASKELL-MODE MODULES IN ORDER TO STAY AT THE BOTTOM OF THE MODULE
+;; DEPENDENCY GRAPH.
+;; =============================================================================
+
+(eval-when-compile (require 'cl-lib))
+
+(defvar-local haskell-utils-async-post-command-flag nil
+  "Non-nil means some commands were triggered during async function execution.")
+
+(defvar haskell-mode-interactive-prompt-state nil
+  "Special variable indicating a state of user input waiting.")
+
+(defun haskell-utils-read-directory-name (prompt default)
+  "Read directory name and normalize to true absolute path.
+Refer to `read-directory-name' for the meaning of PROMPT and
+DEFAULT.  If `haskell-process-load-or-reload-prompt' is nil,
+accept `default'."
+  (let ((filename (file-truename (read-directory-name prompt default default))))
+    (concat (replace-regexp-in-string "/$" "" filename) "/")))
+
+(defun haskell-utils-parse-import-statement-at-point ()
+  "Return imported module name if on import statement or nil otherwise.
+This currently assumes that the \"import\" keyword and the module
+name are on the same line.
+
+This function supports the SafeHaskell and PackageImports syntax extensions.
+
+Note: doesn't detect if in {--}-style comment."
+  (save-excursion
+    (goto-char (line-beginning-position))
+    (if (looking-at (concat "[\t ]*import[\t ]+"
+                            "\\(?:safe[\t ]+\\)?" ;; SafeHaskell
+                            "\\(?:qualified[\t ]+\\)?"
+                            "\\(?:\"[^\"]*\"[\t ]+\\)?" ;; PackageImports
+                            "\\([[:digit:][:upper:][:lower:]_.]+\\)"))
+        (match-string-no-properties 1))))
+
+(defun haskell-utils-async-update-post-command-flag ()
+  "A special hook which collects triggered commands during async execution.
+This hook pushes value of variable `this-command' to flag variable
+`haskell-utils-async-post-command-flag'."
+  (let* ((cmd this-command)
+         (updated-flag (cons cmd haskell-utils-async-post-command-flag)))
+    (setq haskell-utils-async-post-command-flag updated-flag)))
+
+(defun haskell-utils-async-watch-changes ()
+  "Watch for triggered commands during async operation execution.
+Resets flag variable
+`haskell-utils-async-update-post-command-flag' to NIL.  By changes it is
+assumed that nothing happened, e.g. nothing was inserted in
+buffer, point was not moved, etc.  To collect data `post-command-hook' is used."
+  (setq haskell-utils-async-post-command-flag nil)
+  (add-hook
+   'post-command-hook #'haskell-utils-async-update-post-command-flag nil t))
+
+(defun haskell-utils-async-stop-watching-changes (buffer)
+  "Clean up after async operation finished.
+This function takes care about cleaning up things made by
+`haskell-utils-async-watch-changes'.  The BUFFER argument is a buffer where
+`post-command-hook' should be disabled.  This is neccessary, because
+it is possible that user will change buffer during async function
+execusion."
+  (with-current-buffer buffer
+    (setq haskell-utils-async-post-command-flag nil)
+    (remove-hook
+     'post-command-hook #'haskell-utils-async-update-post-command-flag t)))
+
+(defun haskell-utils-reduce-string (str)
+  "Remove newlines and extra whitespace from string STR.
+If line starts with a sequence of whitespaces, substitutes this
+sequence with a single whitespace.  Removes all newline
+characters."
+  (let ((s (replace-regexp-in-string "^\s+" " " str)))
+    (replace-regexp-in-string "\r?\n" "" s)))
+
+(defun haskell-utils-repl-response-error-status (response)
+  "Parse response REPL's RESPONSE for errors.
+Returns one of the following symbols:
+
++ unknown-command
++ option-missing
++ interactive-error
++ no-error
+
+*Warning*: this funciton covers only three kind of responses:
+
+* \"unknown command …\"
+  REPL missing requested command
+* \"<interactive>:3:5: …\"
+  interactive REPL error
+* \"Couldn't guess that module name. Does it exist?\"
+  (:type-at and maybe some other commands error)
+* *all other reposnses* are treated as success reposneses and
+  'no-error is returned."
+  (if response
+      (let ((first-line (car (split-string response "\n" t))))
+        (cond
+         ((null first-line) 'no-error)
+         ((string-match-p "^unknown command" first-line)
+          'unknown-command)
+         ((string-match-p
+           "^Couldn't guess that module name. Does it exist?"
+           first-line)
+          'option-missing)
+         ((string-match-p "^<interactive>:" first-line)
+          'interactive-error)
+         (t 'no-error)))
+    ;; in case of nil-ish reponse it's not clear is it error response or not
+    'no-error))
+
+(defun haskell-utils-compose-type-at-command (pos)
+  "Prepare :type-at command to be send to haskell process.
+POS is a cons cell containing min and max positions, i.e. target
+expression bounds."
+  (save-excursion
+    (let ((start-p (car pos))
+          (end-p (cdr pos))
+          start-l
+          start-c
+          end-l
+          end-c
+          value)
+      (goto-char start-p)
+      (setq start-l (line-number-at-pos))
+      (setq start-c (1+ (current-column)))
+      (goto-char end-p)
+      (setq end-l (line-number-at-pos))
+      (setq end-c (1+ (current-column)))
+      (setq value (buffer-substring-no-properties start-p end-p))
+      ;; supress multiline expressions
+      (let ((lines (split-string value "\n" t)))
+        (when (and (cdr lines)
+                   (stringp (car lines)))
+          (setq value (format "[ %s … ]" (car lines)))))
+      (replace-regexp-in-string
+       "\n$"
+       ""
+       (format ":type-at %s %d %d %d %d %s"
+               (buffer-file-name)
+               start-l
+               start-c
+               end-l
+               end-c
+               value)))))
+
+
+(defun haskell-mode-toggle-interactive-prompt-state (&optional disabled)
+  "Set `haskell-mode-interactive-prompt-state' to t.
+If given DISABLED argument sets variable value to nil, otherwise to t."
+  (setq haskell-mode-interactive-prompt-state (not disabled)))
+
+(provide 'haskell-utils)
+;;; haskell-utils.el ends here