pycscope: ability to configure the binary name

By default, cscope uses the "pycscope" command. This new variable
allow one to specify another binary name, e.g: python3-pycscope.

CHANGELOG.develop

@@ -1313,6 +1313,7 @@ Other:
 - Key bindings:
   - Fixed key binding ~g C~ (thanks to dubnde)
   - New ~SPC m g =~ to find assignments to a symbol (thanks to dubnde)
+- Make pycscope binary configurable (thanks to Gonéri Le Bouder)
 **** CSharp
 - Improvements:
   - Enabled =flycheck= by default (thanks to Saulius Menkevičius)

layers/+tags/cscope/config.el

@@ -0,0 +1,10 @@
+;;; config.el --- cscope configuration File
+;;
+;; Copyright (c) 2019 Sylvain Benner & Contributors
+;;
+;; This file is not part of GNU Emacs.
+;;
+;;; License: GPLv3
+
+(defvar pycscope-binary "pycscope"
+"The name of the pycscope binary.")

layers/+tags/cscope/packages.el

@@ -37,7 +37,8 @@
                                                  (cscope//safe-project-root)))))
         (let ((default-directory directory))
           (shell-command
-           (format "pycscope -R -f '%s'"
+           (format "%s -R -f '%s'"
+                   pycscope-binary
                    (expand-file-name "cscope.out" directory))))))))
 
 (defun cscope/init-helm-cscope ()