Add display-only version of git-rebase-show-commit

Bind this version to SPC.  This is more consistent with behavior in the
log buffer, where RET shows the commit and switches to that buffer and
SPC just displays the commit.

However, the SPC variants still differ in their scrolling behavior.  In
the log buffer, SPC (magit-diff-show-or-scroll-up) will scroll if the
buffer is already displayed, but km/git-rebase-show-commit doesn't
support this.  While it'd be nice to use magit-diff-show-or-scroll-up
directly, this isn't easy to do because magit-diff-show-or-scroll-up
doesn't take a revision argument (it pulls it directly from the magit
section).

1 files changed, 14 insertions, 0 deletions

diff --git a/lisp/init-git.el b/lisp/init-git.el
index 5f1ab82..861d839 100644
--- a/lisp/init-git.el
+++ b/lisp/init-git.el
@@ -151,6 +151,20 @@ START-POINT set to the current branch.
 (after 'git-commit
   (add-hook 'git-commit-setup-hook 'git-commit-turn-on-flyspell))
 
+(defun km/git-rebase-show-commit ()
+  "Show the commit on the current line if any.
+Unlike `git-rebase-show-commit', display (but don't switch to)
+the commit buffer. And no dinging."
+  (interactive)
+  (save-excursion
+    (goto-char (line-beginning-position))
+    (--if-let (and (looking-at git-rebase-line)
+                   (match-string 2))
+        (magit-show-commit it t))))
+
+(after 'git-rebase
+  (define-key git-rebase-mode-map "\s" 'km/git-rebase-show-commit))
+
 (after 'magit
   (magit-backup-mode -1)
   (add-hook 'magit-find-file-hook 'view-mode)