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+;;; lsp-ui-util.el --- Utility module for Lsp-Ui -*- lexical-binding: t -*-
+
+;; Copyright (C) 2020 Shen, Jen-Chieh
+
+;; Author: Jen-Chieh Shen <jcs090218@gmail.com>
+;; URL: https://github.com/emacs-lsp/lsp-ui
+;; Keywords: languages, tools
+;; Version: 6.2
+
+;;; License
+;;
+;; 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, 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; see the file COPYING. If not, write to
+;; the Free Software Foundation, Inc., 51 Franklin Street, Fifth
+;; Floor, Boston, MA 02110-1301, USA.
+
+;;; Commentary:
+
+;;
+;; Utility module for Lsp-Ui.
+;;
+
+;;; Code:
+
+(require 'face-remap)
+
+(defun lsp-ui-util-safe-kill-timer (timer)
+ "Safely kill the TIMER."
+ (when (timerp timer) (cancel-timer timer)))
+
+(defun lsp-ui-util-safe-delete-overlay (overlay)
+ "Safely delete the OVERLAY."
+ (when (overlayp overlay) (delete-overlay overlay)))
+
+(defun lsp-ui-util-line-number-display-width ()
+ "Safe way to get value from function `line-number-display-width'."
+ (if (bound-and-true-p display-line-numbers-mode)
+ ;; For some reason, function `line-number-display-width' gave
+ ;; us error `args-out-of-range' even we do not pass anything towards
+ ;; to it function. See the following links,
+ ;;
+ ;; - https://github.com/emacs-lsp/lsp-ui/issues/294
+ ;; - https://github.com/emacs-lsp/lsp-ui/issues/533 (duplicate)
+ (+ (or (ignore-errors (line-number-display-width)) 0) 2)
+ 0))
+
+(defun lsp-ui-util-line-string (pos)
+ "Return string at POS."
+ (when (integerp pos) (save-excursion (goto-char pos) (thing-at-point 'line))))
+
+(defun lsp-ui-util-column (&optional pos)
+ "Return column at POS."
+ (setq pos (or pos (point)))
+ (save-excursion (goto-char pos) (current-column)))
+
+(defun lsp-ui-util-text-scale-factor ()
+ "Return the factor effect by `text-scale-mode'."
+ (or (plist-get (cdr text-scale-mode-remapping) :height) 1))
+
+(provide 'lsp-ui-util)
+;;; lsp-ui-util.el ends here