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+;;; lsp-ui.el --- UI modules for lsp-mode            -*- lexical-binding: t; -*-
+
+;; Copyright (C) 2017 Tobias Pisani
+
+;; Author:  Tobias Pisani <topisani@hamsterpoison.com>
+;; Keywords: lsp
+;; URL: https://github.com/emacs-lsp/lsp-ui
+;; Package-Requires: ((emacs "25.1") (dash "2.13") (dash-functional "1.2.0") (flycheck "31") (lsp-mode "4.0") (markdown-mode "2.3"))
+;; Version: 0.0.1
+
+;; 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:
+
+;; lsp-ui contains a series of useful UI integrations for lsp-mode, like
+;; flycheck support and code lenses.
+
+;;; Code:
+
+(defgroup lsp-ui nil
+  "‘lsp-ui’ contains a series of useful UI integrations for ‘lsp-mode’."
+  :group 'tools
+  :group 'convenience
+  :link '(custom-manual "(lsp-ui) Top")
+  :link '(info-link "(lsp-ui) Customizing"))
+
+(require 'lsp-ui-sideline)
+(require 'lsp-ui-peek)
+(require 'lsp-ui-flycheck)
+(require 'lsp-ui-imenu)
+(require 'lsp-ui-doc)
+
+(defun lsp-ui-peek--render (major string)
+  (with-temp-buffer
+    (insert string)
+    (delay-mode-hooks
+      (let ((inhibit-message t))
+        (funcall major))
+      (ignore-errors
+        (font-lock-ensure)))
+    (buffer-string))
+  )
+
+
+(defun lsp-ui--workspace-path (path)
+  "Return the PATH relative to the workspace.
+If the PATH is not in the workspace, it returns the original PATH."
+  (let* ((path (file-truename path))
+         (root (lsp--workspace-root lsp--cur-workspace))
+         (in-workspace (string-prefix-p root path)))
+    (if in-workspace
+        (substring path (length root))
+      path)))
+
+(defun lsp-ui--toggle (enable)
+  (dolist (feature '(lsp-ui-flycheck lsp-ui-peek lsp-ui-sideline lsp-ui-doc lsp-ui-imenu))
+    (let* ((sym (intern-soft (concat (symbol-name feature) "-enable")))
+           (value (symbol-value sym))
+           (fn (symbol-function sym)))
+      (when (and (or value (not enable))
+                 (functionp fn))
+        (funcall fn enable)))))
+
+(defvar lsp-ui-mode-map (make-sparse-keymap))
+
+;;;###autoload
+(define-minor-mode lsp-ui-mode
+  "Toggle language server UI mode on or off.
+‘lsp-ui-mode’ is a minor mode that contains a series of useful UI
+integrations for ‘lsp-mode’.  With a prefix argument ARG, enable
+language server UI mode if ARG is positive, and disable it
+otherwise.  If called from Lisp, enable the mode if ARG is
+omitted or nil, and toggle it if ARG is ‘toggle’."
+  :init-value nil
+  :group lsp-ui
+  :keymap lsp-ui-mode-map
+  (lsp-ui--toggle lsp-ui-mode))
+
+;; The request is delegated to xref-backend-apropos defined in lsp-mode.
+;; xref-find-apropos does similar job but is less appealing because it splits and
+;; regex quotes the pattern. The language server likely knows more about how
+;; to do fuzzy matching.
+(defun lsp-ui-find-workspace-symbol (pattern)
+  "List project-wide symbols matching the query string PATTERN."
+  (interactive (list (read-string
+                      "workspace/symbol: "
+                      nil 'xref--read-pattern-history)))
+  (xref--find-xrefs pattern 'apropos pattern nil))
+
+(defun lsp-ui--location< (x y)
+  "Compares two triples X and Y.
+Both should have the form (FILENAME LINE COLUMN)."
+  (if (not (string= (car x) (car y)))
+      (string< (car x) (car y))
+    (if (not (= (cadr x) (cadr y)))
+        (< (cadr x) (cadr y))
+      (< (caddr x) (caddr y)))))
+
+(defun lsp-ui--reference-triples (filter-fn)
+  "Return references as a list of (FILENAME LINE COLUMN) triples."
+  (let ((refs (lsp--send-request (lsp--make-request
+                                  "textDocument/references"
+                                  (lsp--make-reference-params)))))
+    (sort
+     (mapcar
+      (lambda (ref)
+        (-let* (((&hash "uri" uri "range" range) ref)
+                ((&hash "line" line "character" col) (gethash "start" range)))
+          (list (lsp--uri-to-path uri) line col)))
+      (if filter-fn (--filter (funcall filter-fn it) refs) refs))
+     #'lsp-ui--location<)))
+
+;; TODO Make it efficient
+(defun lsp-ui-find-next-reference (&optional filter-fn)
+  "Find next reference of the symbol at point."
+  (interactive)
+  (let* ((cur (list buffer-file-name (lsp--cur-line) (lsp--cur-column)))
+         (refs (lsp-ui--reference-triples filter-fn))
+         (idx -1)
+         (res (-first (lambda (ref) (cl-incf idx) (lsp-ui--location< cur ref)) refs)))
+    (if res
+        (progn
+         (find-file (car res))
+         (goto-char 1)
+         (forward-line (cadr res))
+         (forward-char (caddr res))
+         (cons idx (length refs)))
+      (cons 0 0))))
+
+;; TODO Make it efficient
+(defun lsp-ui-find-prev-reference (&optional filter-fn)
+  "Find previous reference of the symbol at point."
+  (interactive)
+  (let* ((cur (list buffer-file-name (lsp--cur-line) (lsp--cur-column)))
+         (refs (lsp-ui--reference-triples filter-fn))
+         (idx -1)
+         (res (-last (lambda (ref) (and (lsp-ui--location< ref cur) (cl-incf idx))) refs)))
+    (if res
+        (progn
+          (find-file (car res))
+          (goto-char 1)
+          (forward-line (cadr res))
+          (forward-char (caddr res))
+          (cons idx (length refs)))
+      (cons 0 0))))
+
+
+(provide 'lsp-ui)
+;;; lsp-ui.el ends here