From a583d69ae10829faac39fef133186a64208c56d7 Mon Sep 17 00:00:00 2001
From: Henrik Lissner <henrik@lissner.net>
Date: Wed, 29 May 2019 23:44:23 -0400
Subject: [PATCH] Fix #1442: void-function eshell-input-filter-initial-space

eshell-input-filter-initial-space was introduced in Emacs 26. I've
inlined its definition, at least until we drop 25.x support.
---
 modules/term/eshell/config.el | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/modules/term/eshell/config.el b/modules/term/eshell/config.el
index c8a65540b..8739067e5 100644
--- a/modules/term/eshell/config.el
+++ b/modules/term/eshell/config.el
@@ -62,7 +62,8 @@ You should use `det-eshell-alias!' to change this.")
         eshell-kill-processes-on-exit t
         eshell-hist-ignoredups t
         ;; don't record command in history if prefixed with whitespace
-        eshell-input-filter #'eshell-input-filter-initial-space
+        ;; TODO Use `eshell-input-filter-initial-space' when Emacs 25 support is dropped
+        eshell-input-filter (lambda (input) (not (string-match-p "\\`\\s-+" input)))
         ;; em-prompt
         eshell-prompt-regexp "^.* λ "
         eshell-prompt-function #'+eshell-default-prompt