Enable automatic co-install of msys

etc/w32-msys-install.el

@@ -0,0 +1,106 @@
+;;; w32-feature.el --- Check Availability of Emacs Features  -*- lexical-binding: t -*-
+
+;; Copyright (C) 2020-2021 Free Software Foundation, Inc.
+
+;; Author: Phillip Lord <phillip.lord@russet.org.uk>
+
+;; This file is part of GNU Emacs.
+
+;; GNU Emacs 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 of the License, or
+;; (at your option) any later version.
+
+;; GNU Emacs 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 GNU Emacs.  If not, see <https://www.gnu.org/licenses/>.
+
+;;; Commentary:
+
+;; This file provides tests for various features of Emacs. It is
+;; designed to check whether bundled binary distributions of Emacs on
+;; windows are fully functional.
+
+;; By default is checks whether the features that we are expect to be
+;; available on Emacs for Windows are reported to be available. It
+;; should be possible to run these tests from a distributed version of
+;; Emacs.
+
+;; In addition, it provides a single command
+;; `w32-feature-load-tests'. If the full source repository of Emacs is
+;; available, this will load selected files from the repository which
+;; test these features.
+
+;;; Code:
+(defvar w32-msys-process-log "*w32-process-log*")
+(defvar w32-msys-buffer "*w32-install*")
+
+(defvar w32-install-queue nil)
+
+(defun w32-msys-run (command)
+  (with-current-buffer
+      (get-buffer-create w32-msys-process-log)
+    (goto-char (point-max))
+    (insert (format "%s\n\n\n"
+             (mapconcat 'identity command " "))))
+  (make-process
+   :name "w32-msys-install"
+   :buffer w32-msys-process-log
+   :sentinel 'w32-msys-install-sentinel
+   :command command))
+
+(defun w32-msys-install-sentinel (p state)
+  (cond
+   ((equal state "finished\n")
+    (if w32-install-queue
+        (w32-msys-install-next-queue)
+      (w32-msys-complete)))
+   (t
+    (message "unexepect state: %s" state))))
+
+(defun w32-msys-install-add-to-site-start ()
+  (write-region
+   "(load-library (expand-file-name \"w32-msys-site-start.el\" data-directory))"
+   nil
+   (expand-file-name "../site-lisp/site-start.el" data-directory)))
+
+(defun w32-msys-install-next-queue ()
+  (let ((c (car w32-install-queue)))
+    (setq w32-install-queue (cdr w32-install-queue))
+    (w32-msys-run c)))
+
+(defun w32-msys-run-queue ()
+  (setq w32-install-queue (reverse w32-install-queue))
+  (w32-msys-install-next-queue))
+
+(defun w32-msys-command (command-line)
+  (setq w32-install-queue (cons (split-string command-line " ")
+                                w32-install-queue)))
+
+(defun w32-msys-install ()
+  (interactive)
+  (w32-msys-install-add-to-site-start)
+  ;; Assume for now that msys has been set up correctly
+  (w32-msys-command "pacman --noconfirm -Su")
+  (w32-msys-command "pacman --noconfirm -S git")
+  (w32-msys-run-queue))
+
+(defun w32-msys-install-dialog ()
+  (interactive)
+  (setq mode-line-format nil)
+  (scroll-bar-mode 0)
+  (menu-bar-mode 0)
+  (tool-bar-mode 0)
+  (w32-msys-install))
+
+(defun w32-msys-complete ()
+  (message "complete"))
+
+;; (setq mode-line-format nil)
+;; (scroll-bar-mode 0)
+
+;;; w32-msys-install.el ends here

etc/w32-msys-site-start.el

@@ -0,0 +1,11 @@
+(defvar w32-msys-site-start-install-dir
+  (expand-file-name (concat data-directory "../../../../")))
+
+(defvar w32-msys-top-level-dir (concat w32-msys-site-start-install-dir "msys64"))
+
+(when (file-exists-p w32-msys-top-level-dir)
+  (setenv "PATH" (concat (getenv "PATH")
+                         (replace-regexp-in-string "/" "\\\\"
+                                                   w32-msys-top-level-dir)
+                         "\\usr\\bin;"))
+  (add-to-list 'exec-path (concat w32-msys-top-level-dir "/usr/bin")))