From 7ec4dca723d8f217d1a85d7669a1e3c4f9842cd4 Mon Sep 17 00:00:00 2001
From: William Carroll <wpcarro@gmail.com>
Date: Mon, 23 Dec 2019 11:43:27 +0000
Subject: [PATCH] Reduce latency of screen-brightness/{increase,decrease}

As promised in the previous commit, I'm refactoring usages of `shell-command` to
prefer the faster alternative `start-process`. So far, I'm pleased with the
results.
---
 .../shared/.emacs.d/wpc/screen-brightness.el  | 27 +++++++++----------
 1 file changed, 12 insertions(+), 15 deletions(-)

diff --git a/configs/shared/.emacs.d/wpc/screen-brightness.el b/configs/shared/.emacs.d/wpc/screen-brightness.el
index 1b74ea34a..8183196cc 100644
--- a/configs/shared/.emacs.d/wpc/screen-brightness.el
+++ b/configs/shared/.emacs.d/wpc/screen-brightness.el
@@ -8,13 +8,6 @@
 
 ;; TODO: Define some isomorphisms. E.g. int->string, string->int.
 
-;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
-;; Dependencies
-;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
-
-(require 'string)
-(require 'dash)
-
 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 ;; Constants
 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
@@ -32,19 +25,23 @@
 (defun screen-brightness/increase ()
   "Increase the screen brightness."
   (interactive)
-  (->> screen-brightness/step-size
-       int-to-string
-       (string/concat "xbacklight -inc ")
-       shell-command)
+  (start-process
+   "*xbacklight<screen-brightness/increase>*"
+   nil
+   "xbacklight"
+   "-inc"
+   (int-to-string screen-brightness/step-size))
   (message "[screen-brightness.el] Increased screen brightness."))
 
 (defun screen-brightness/decrease ()
   "Decrease the screen brightness."
   (interactive)
-  (->> screen-brightness/step-size
-       int-to-string
-       (string/concat "xbacklight -dec ")
-       shell-command)
+  (start-process
+   "*xbacklight<screen-brightness/decrease>*"
+   nil
+   "xbacklight"
+   "-dec"
+   (int-to-string screen-brightness/step-size))
   (message "[screen-brightness.el] Decreased screen brightness."))
 
 (when screen-brightness/install-kbds?