From de9f2e1a7133430dcafdd73ba4a16bacca371311 Mon Sep 17 00:00:00 2001
From: James Nguyen <ja.nguyen@gmail.com>
Date: Wed, 15 Jun 2016 03:50:02 -0700
Subject: [PATCH] Add support for auto-complete like behavior (#524)

Adding a new frontend, a new command and a new tooltip visibility predicate.
---
 company.el | 58 +++++++++++++++++++++++++++++++++++++++++++++++++++---
 1 file changed, 55 insertions(+), 3 deletions(-)

diff --git a/company.el b/company.el
index 28ed56be3..7ea4b0854 100644
--- a/company.el
+++ b/company.el
@@ -186,9 +186,13 @@ buffer-local wherever it is set."
 (defun company-frontends-set (variable value)
   ;; Uniquify.
   (let ((value (delete-dups (copy-sequence value))))
-    (and (memq 'company-pseudo-tooltip-unless-just-one-frontend value)
-         (memq 'company-pseudo-tooltip-frontend value)
-         (error "Pseudo tooltip frontend cannot be used twice"))
+    (and (or (and (memq 'company-pseudo-tooltip-unless-just-one-frontend value)
+                  (memq 'company-pseudo-tooltip-frontend value))
+             (and (memq 'company-pseudo-tooltip-unless-just-one-frontend-with-delay value)
+                  (memq 'company-pseudo-tooltip-frontend value))
+             (and (memq 'company-pseudo-tooltip-unless-just-one-frontend-with-delay value)
+                  (memq 'company-pseudo-tooltip-unless-just-one-frontend value)))
+         (error "Pseudo tooltip frontend cannot be used more than once"))
     (and (memq 'company-preview-if-just-one-frontend value)
          (memq 'company-preview-frontend value)
          (error "Preview frontend cannot be used twice"))
@@ -233,6 +237,8 @@ The visualized data is stored in `company-prefix', `company-candidates',
                                 company-pseudo-tooltip-frontend)
                          (const :tag "pseudo tooltip, multiple only"
                                 company-pseudo-tooltip-unless-just-one-frontend)
+                         (const :tag "pseudo tooltip, multiple only, delayed"
+                                company-pseudo-tooltip-unless-just-one-frontend-with-delay)
                          (const :tag "preview" company-preview-frontend)
                          (const :tag "preview, unique only"
                                 company-preview-if-just-one-frontend)
@@ -559,6 +565,13 @@ happens.  The value of nil means no idle completion."
                  (const :tag "immediate (0)" 0)
                  (number :tag "seconds")))
 
+(defcustom company-tooltip-idle-delay .5
+  "The idle delay in seconds until tooltip is shown when using
+`company-pseudo-tooltip-unless-just-one-frontend-with-delay'."
+  :type '(choice (const :tag "never (nil)" nil)
+                 (const :tag "immediate (0)" 0)
+                 (number :tag "seconds")))
+
 (defcustom company-begin-commands '(self-insert-command
                                     org-self-insert-command
                                     orgtbl-self-insert-command
@@ -1019,6 +1032,7 @@ Controlled by `company-auto-complete'.")
 (defvar-local company-point nil)
 
 (defvar company-timer nil)
+(defvar company-tooltip-timer nil)
 
 (defsubst company-strip-prefix (str)
   (substring str (length company-prefix)))
@@ -2060,6 +2074,15 @@ With ARG, move by that many elements."
                  (eq old-tick (buffer-chars-modified-tick)))
         (company-complete-common))))))
 
+(defun company-select-next-if-tooltip-visible-or-complete-selection ()
+  "Insert selection if appropriate, or select the next candidate.
+Insert selection if only preview is showing or only one candidate,
+otherwise select the next candidate."
+  (interactive)
+  (if (and (company-tooltip-visible-p) (> company-candidates-length 1))
+      (call-interactively 'company-select-next)
+    (call-interactively 'company-complete-selection)))
+
 ;;;###autoload
 (defun company-complete ()
   "Insert the common part of all candidates or the current selection.
@@ -2830,6 +2853,30 @@ Returns a negative number if the tooltip should be displayed above point."
                (company--show-inline-p))
     (company-pseudo-tooltip-frontend command)))
 
+(defun company-pseudo-tooltip-unless-just-one-frontend-with-delay (command)
+  "`compandy-pseudo-tooltip-frontend', but shown after a delay.
+Delay is determined by `company-tooltip-idle-delay'."
+  (cl-case command
+    (pre-command
+     (company-pseudo-tooltip-unless-just-one-frontend command)
+     (when company-tooltip-timer
+       (cancel-timer company-tooltip-timer)
+       (setq company-tooltip-timer nil)))
+    (post-command
+     (if (or company-tooltip-timer
+             (overlayp company-pseudo-tooltip-overlay))
+         (if (not (memq 'company-preview-frontend company-frontends))
+             (company-pseudo-tooltip-unless-just-one-frontend command)
+           (company-preview-frontend 'pre-command)
+           (company-pseudo-tooltip-unless-just-one-frontend command)
+           (company-preview-frontend 'post-command))
+       (setq company-tooltip-timer
+             (run-with-timer company-tooltip-idle-delay nil
+                             'company-pseudo-tooltip-unless-just-one-frontend-with-delay
+                             'post-command))))
+    (t
+     (company-pseudo-tooltip-unless-just-one-frontend command))))
+
 ;;; overlay ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 
 (defvar-local company-preview-overlay nil)
@@ -2904,6 +2951,11 @@ Returns a negative number if the tooltip should be displayed above point."
        (or (eq (company-call-backend 'ignore-case) 'keep-prefix)
            (string-prefix-p company-prefix company-common))))
 
+(defun company-tooltip-visible-p ()
+  "Returns whether the tooltip is visible."
+  (when (overlayp company-pseudo-tooltip-overlay)
+    (not (overlay-get company-pseudo-tooltip-overlay 'invisible))))
+
 ;;; echo ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 
 (defvar-local company-echo-last-msg nil)
-- 
2.39.2