Add automatic pull support

README.org

@@ -3,7 +3,7 @@
 
 * NAME
 
-  git-auto-commit-mode - Emacs minor mode to automatically commit (and
+  git-auto-commit-mode - Emacs minor mode to automatically commit (and pull and
   push) a git repository.
 
   [[http://melpa.org/#/git-auto-commit-mode][file:http://melpa.org/packages/git-auto-commit-mode-badge.svg]]
@@ -26,6 +26,8 @@
   When enabled, git-auto-commit-mode uses the =after-save-hook= to
   commit changes to git each time. If =gac-automatically-push-p= is
   non-nil it also tries to push the ~HEAD~ to the current upstream.
+  If =gac-automatically-pull-p= is
+  non-nil it also tries to pull the ~HEAD~ to the current upstream.
   Making sure that upstream is properly set is the responsibility of
   the user.
 
@@ -82,6 +84,11 @@
     push the git repository's ~HEAD~ to its default upstream. Setting up the
     upstream is the user's responsibility.
 
+  - =gac-automatically-pull-p= ::
+    A boolean value indicating whether or not git-auto-commit-mode should try to
+    pull the git repository's ~HEAD~ from its default upstream. Setting up the
+    upstream is the user's responsibility.    
+
   - =gac-automatically-add-new-files-p= ::
     A boolean value indicating whether or not git-auto-commit-mode should add
     new (untracked) files to the repository.

git-auto-commit-mode.el

@@ -8,6 +8,9 @@
 ;; Keywords: vc
 ;; URL: https://github.com/ryuslash/git-auto-commit-mode
 
+;; Updates by: Kyle Harrington <[email protected]>
+;; Updated: Sept 22, 2021
+
 ;; This file 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
@@ -29,6 +32,9 @@
 ;; When `gac-automatically-push-p' is non-nil, it also tries to push
 ;; to the current upstream.
 
+;; When `gac-automatically-pull-p' is non-nil, it also tries to pull
+;; from the current upstream.
+
 ;; When `gac-debounce-interval' is non-nil and set to a number
 ;; representing seconds, it will only perform Git actions at that
 ;; interval. That way, repeatedly saving a file will not hammer the
@@ -52,6 +58,16 @@ If non-nil a git push will be executed after each commit."
   :risky t)
 (make-variable-buffer-local 'gac-automatically-push-p)
 
+(defcustom gac-automatically-pull-p nil
+  "Automatically pull before each commit.
+
+If non-nil a git pull will be executed before each commit."
+  :tag "Automatically pull"
+  :group 'git-auto-commit-mode
+  :type 'boolean
+  :risky t)
+(make-variable-buffer-local 'gac-automatically-pull-p)
+
 (defcustom gac-automatically-add-new-files-p t
   "Should new (untracked) files automatically be committed to the repo?"
   :tag "Automatically add new files"
@@ -193,9 +209,21 @@ should already have been set up."
   ;; default-directory. The explicit binding here is defensive, in case gac-push
   ;; starts being used elsewhere.
   (let ((default-directory (file-name-directory (buffer-file-name buffer))))
-    (let ((proc (start-process "git" "*git-auto-push*" "git" "push")))
-      (set-process-sentinel proc 'gac-process-sentinel)
-      (set-process-filter proc 'gac-process-filter))))
+    (call-process "git" nil "*git-auto-push*" nil "push")))
+
+(defun gac-pull (buffer)
+  "Pull commits from the current upstream.
+This doesn't check or ask for a remote, so the correct remote
+should already have been set up."
+  ;; gac-pull is currently only called from gac--after-save, where it is wrapped
+  ;; in with-current-buffer, which should already take care of
+  ;; default-directory. The explicit binding here is defensive, in case gac-pull
+  ;; starts being used elsewhere.
+  (let ((default-directory (file-name-directory (buffer-file-name buffer))))
+    (call-process "git" nil "*git-auto-pull*"  nil "merge" "--squash")
+    (call-process "git" nil "*git-auto-pull*" nil "commit" "--no-edit")
+    (call-process "git" nil "*git-auto-pull*" nil "pull" "--rebase")))
+
 
 (defvar gac--debounce-timers (make-hash-table :test #'equal))
 
@@ -234,11 +262,17 @@ should already have been set up."
                           (not (gac--buffer-is-tracked buffer)))
                      (gac--buffer-has-changes buffer)))
         (gac-commit buffer)
-        (with-current-buffer buffer
-          ;; with-current-buffer required here because gac-automatically-push-p
-          ;; is buffer-local
-          (when gac-automatically-push-p
-            (gac-push buffer))))
+        (make-thread
+         (lambda ()
+           (with-current-buffer buffer
+             ;; with-current-buffer required here because gac-automatically-pull-p
+             ;; is buffer-local
+             (when gac-automatically-pull-p
+               (gac-pull buffer))
+             ;; with-current-buffer required here because gac-automatically-push-p
+             ;; is buffer-local
+             (when gac-automatically-push-p
+               (gac-push buffer))))))
     (remhash buffer gac--debounce-timers)))
 
 (defun gac-kill-buffer-hook ()
@@ -260,7 +294,7 @@ When `gac-automatically-push-p' is non-nil also push."
 ;;;###autoload
 (define-minor-mode git-auto-commit-mode
   "Automatically commit any changes made when saving with this
-mode turned on and optionally push them too."
+mode turned on, optionally pull and push them too."
   :lighter " ga"
   (if git-auto-commit-mode
       (add-hook 'after-save-hook 'gac-after-save-func t t)