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+;;; ivy-overlay.el --- Overlay display functions for Ivy  -*- lexical-binding: t -*-
+
+;; Copyright (C) 2016-2018  Free Software Foundation, Inc.
+
+;; Author: Oleh Krehel <ohwoeowho@gmail.com>
+;; Keywords: convenience
+
+;; 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
+;; 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 package allows to setup Ivy's completion at point to actually
+;; show the candidates and the input at point, instead of in the
+;; minibuffer.
+
+;;; Code:
+
+(defface ivy-cursor
+  '((t (:background "black"
+        :foreground "white")))
+  "Cursor face for inline completion."
+  :group 'ivy-faces)
+
+(defvar ivy--old-cursor-type t)
+
+(defvar ivy-overlay-at nil
+  "Overlay variable for `ivy-display-function-overlay'.")
+
+(declare-function ivy--truncate-string "ivy")
+
+(defun ivy-left-pad (str width)
+  "Return STR, but with each line indented by WIDTH spaces.
+Lines are truncated to the window width."
+  (let ((padding (make-string width ?\s)))
+    (mapconcat (lambda (x)
+                 (ivy--truncate-string (concat padding x)
+                                       (1- (+ (window-width)
+                                              (window-hscroll)))))
+               (split-string str "\n")
+               "\n")))
+
+(defun ivy-overlay-cleanup ()
+  "Clean up after `ivy-display-function-overlay'."
+  (when (overlayp ivy-overlay-at)
+    (delete-overlay ivy-overlay-at)
+    (setq ivy-overlay-at nil))
+  (unless cursor-type
+    (setq cursor-type ivy--old-cursor-type))
+  (when (fboundp 'company-abort)
+    (company-abort)))
+
+(defun ivy-overlay-show-after (str)
+  "Display STR in an overlay at point.
+
+First, fill each line of STR with spaces to the current column.
+Then attach the overlay the character before point."
+  (if ivy-overlay-at
+      (progn
+        (move-overlay ivy-overlay-at (1- (point)) (line-end-position))
+        (overlay-put ivy-overlay-at 'invisible nil))
+    (setq ivy-overlay-at (make-overlay (1- (point)) (line-end-position)))
+    (overlay-put ivy-overlay-at 'priority 9999))
+  (overlay-put ivy-overlay-at 'display str)
+  (overlay-put ivy-overlay-at 'after-string ""))
+
+(declare-function org-current-level "org")
+(defvar org-indent-indentation-per-level)
+(defvar ivy-height)
+(defvar ivy-last)
+(defvar ivy-text)
+(defvar ivy-completion-beg)
+(declare-function ivy-add-face-text-property "ivy")
+(declare-function ivy--get-window "ivy")
+(declare-function ivy-state-current "ivy")
+(declare-function ivy-state-window "ivy")
+
+(defun ivy-overlay-impossible-p (str)
+  (or
+   (<= (window-height) (+ ivy-height 3))
+   (= (point) (point-min))
+   (< (- (+ (window-width) (window-hscroll)) (current-column))
+      (apply #'max
+             (mapcar #'length
+                     (split-string str "\n"))))))
+
+(defun ivy-display-function-overlay (str)
+  "Called from the minibuffer, display STR in an overlay in Ivy window.
+Hide the minibuffer contents and cursor."
+  (if (save-selected-window
+        (select-window (ivy-state-window ivy-last))
+        (ivy-overlay-impossible-p str))
+      (let ((buffer-undo-list t))
+        (save-excursion
+          (forward-line 1)
+          (insert str)))
+    (ivy-add-face-text-property (minibuffer-prompt-end) (point-max)
+                                '(:foreground "white"))
+    (let ((cursor-pos (1+ (- (point) (minibuffer-prompt-end))))
+          (ivy-window (ivy--get-window ivy-last)))
+      (setq cursor-type nil)
+      (with-selected-window ivy-window
+        (when cursor-type
+          (setq ivy--old-cursor-type cursor-type))
+        (setq cursor-type nil)
+        (let ((overlay-str
+               (concat
+                (buffer-substring (max 1 (1- (point))) (point))
+                ivy-text
+                (if (eolp)
+                    " "
+                  "")
+                (buffer-substring (point) (line-end-position))
+                (ivy-left-pad
+                 str
+                 (+ (if (and (eq major-mode 'org-mode)
+                             (bound-and-true-p org-indent-mode))
+                        (* org-indent-indentation-per-level (org-current-level))
+                      0)
+                    (save-excursion
+                      (goto-char ivy-completion-beg)
+                      (current-column)))))))
+          (ivy-add-face-text-property cursor-pos (1+ cursor-pos)
+                                      'ivy-cursor overlay-str t)
+          (ivy-overlay-show-after overlay-str))))))
+
+(provide 'ivy-overlay)
+
+;;; ivy-overlay.el ends here