emacs-27 478638e: Revert "Fix eshell-mode-map initialization"

[Noam Postavsky]

branch: emacs-27
commit 478638e4706716b74de5b1aa3e85c8fd943f17ba
Author: Noam Postavsky <address@hidden>
Commit: Noam Postavsky <address@hidden>

    Revert "Fix eshell-mode-map initialization"
    
    It makes eshell-return-exits-minibuffer permanently affect the
    eshell-mode-map (Bug#41370).
    
    Do not merge to master, we will fix it properly there.
---
 etc/NEWS                 |  6 -----
 lisp/eshell/em-cmpl.el   | 35 +++++++++++----------------
 lisp/eshell/em-hist.el   | 62 ++++++++++++++++++++++--------------------------
 lisp/eshell/em-pred.el   | 15 ++----------
 lisp/eshell/em-prompt.el | 16 +++----------
 lisp/eshell/em-rebind.el | 13 +---------
 lisp/eshell/esh-arg.el   | 16 ++++---------
 lisp/eshell/esh-mode.el  | 58 ++++++++++++++++++++++++--------------------
 lisp/eshell/esh-proc.el  | 28 +++++++++-------------
 lisp/eshell/esh-var.el   | 16 ++++---------
 10 files changed, 100 insertions(+), 165 deletions(-)

diff --git a/etc/NEWS b/etc/NEWS
index bb275b7..58bd491 100644
--- a/etc/NEWS
+++ b/etc/NEWS
@@ -2054,12 +2054,6 @@ default, and not just the opening element.
 behave similarly, e.g. Pcomplete's default cycling can be obtained
 with '(setq completion-cycle-threshold 5)'.
 
----
-*** Eshell no longer re-initializes its keymap every call.
-This allows users to use (define-key eshell-mode-map ...) as usual.
-Some modules have their own minor mode now to account for these
-changes.
-
 +++
 *** Expansion of history event designators is disabled by default.
 To restore the old behavior, use
diff --git a/lisp/eshell/em-cmpl.el b/lisp/eshell/em-cmpl.el
index dcf56af..48c99ac 100644
--- a/lisp/eshell/em-cmpl.el
+++ b/lisp/eshell/em-cmpl.el
@@ -244,26 +244,6 @@ to writing a completion function."
   (let ((completion-at-point-functions '(elisp-completion-at-point)))
     (completion-at-point)))
 
-(defvar eshell-cmpl-mode-map
-  (let ((map (make-sparse-keymap)))
-    (define-key map [(control ?i)] #'completion-at-point)
-    ;; jww (1999-10-19): Will this work on anything but X?
-    (define-key map [backtab] #'pcomplete-reverse)
-    (define-key map [(meta ??)] #'completion-help-at-point)
-    (define-key map [(meta control ?i)] #'eshell-complete-lisp-symbol)
-    ;; C-c prefix:
-    (define-key map (kbd "C-c M-h") #'eshell-completion-help)
-    (define-key map (kbd "C-c TAB") #'pcomplete-expand-and-complete)
-    (define-key map (kbd "C-c C-i") #'pcomplete-expand-and-complete)
-    (define-key map (kbd "C-c SPC") #'pcomplete-expand)
-    map))
-
-(define-minor-mode eshell-cmpl-mode
-  "Minor mode that provides a keymap when `eshell-cmpl' active.
-
-\\{eshell-cmpl-mode-map}"
-  :keymap eshell-cmpl-mode-map)
-
 (defun eshell-cmpl-initialize ()    ;Called from `eshell-mode' via intern-soft!
   "Initialize the completions module."
   (set (make-local-variable 'pcomplete-command-completion-function)
@@ -311,9 +291,22 @@ to writing a completion function."
                    eshell-special-chars-outside-quoting)))
             nil t)
   (add-hook 'pcomplete-quote-arg-hook #'eshell-quote-backslash nil t)
+  ;;(define-key eshell-mode-map [(meta tab)] 'eshell-complete-lisp-symbol) ; 
Redundant
+  (define-key eshell-mode-map [(meta control ?i)] 'eshell-complete-lisp-symbol)
+  (define-key eshell-command-map [(meta ?h)] 'eshell-completion-help)
+  (define-key eshell-command-map [tab] 'pcomplete-expand-and-complete)
+  (define-key eshell-command-map [(control ?i)]
+    'pcomplete-expand-and-complete)
+  (define-key eshell-command-map [space] 'pcomplete-expand)
+  (define-key eshell-command-map [? ] 'pcomplete-expand)
+  ;;(define-key eshell-mode-map [tab] 'completion-at-point) ;Redundant!
+  (define-key eshell-mode-map [(control ?i)] 'completion-at-point)
   (add-hook 'completion-at-point-functions
             #'pcomplete-completions-at-point nil t)
-  (eshell-cmpl-mode))
+  ;; jww (1999-10-19): Will this work on anything but X?
+  (define-key eshell-mode-map
+    (if (featurep 'xemacs) [iso-left-tab] [backtab]) 'pcomplete-reverse)
+  (define-key eshell-mode-map [(meta ??)] 'completion-help-at-point))
 
 (defun eshell-completion-command-name ()
   "Return the command name, possibly sans globbing."
diff --git a/lisp/eshell/em-hist.el b/lisp/eshell/em-hist.el
index 2679365..73742a3 100644
--- a/lisp/eshell/em-hist.el
+++ b/lisp/eshell/em-hist.el
@@ -202,32 +202,6 @@ element, regardless of any text on the command line.  In 
that case,
     map)
   "Keymap used in isearch in Eshell.")
 
-(defvar eshell-hist-mode-map
-  (let ((map (make-sparse-keymap)))
-    (define-key map [up] #'eshell-previous-matching-input-from-input)
-    (define-key map [down] #'eshell-next-matching-input-from-input)
-    (define-key map [(control up)] #'eshell-previous-input)
-    (define-key map [(control down)] #'eshell-next-input)
-    (define-key map [(meta ?r)] #'eshell-previous-matching-input)
-    (define-key map [(meta ?s)] #'eshell-next-matching-input)
-    (define-key map (kbd "C-c M-r") 
#'eshell-previous-matching-input-from-input)
-    (define-key map (kbd "C-c M-s") #'eshell-next-matching-input-from-input)
-    ;; FIXME: Relies on `eshell-hist-match-partial' being set _before_
-    ;; em-hist is loaded and won't respect changes.
-    (if eshell-hist-match-partial
-       (progn
-         (define-key map [(meta ?p)] 
'eshell-previous-matching-input-from-input)
-         (define-key map [(meta ?n)] 'eshell-next-matching-input-from-input)
-         (define-key map (kbd "C-c M-p") #'eshell-previous-input)
-         (define-key map (kbd "C-c M-n") #'eshell-next-input))
-      (define-key map [(meta ?p)] #'eshell-previous-input)
-      (define-key map [(meta ?n)] #'eshell-next-input)
-      (define-key map (kbd "C-c M-p") 
#'eshell-previous-matching-input-from-input)
-      (define-key map (kbd "C-c M-n") #'eshell-next-matching-input-from-input))
-    (define-key map (kbd "C-c C-l") #'eshell-list-history)
-    (define-key map (kbd "C-c C-x") #'eshell-get-next-from-history)
-    map))
-
 (defvar eshell-rebind-keys-alist)
 
 ;;; Functions:
@@ -242,12 +216,6 @@ Returns non-nil if INPUT is blank."
 Returns nil if INPUT is prepended by blank space, otherwise non-nil."
   (not (string-match-p "\\`\\s-+" input)))
 
-(define-minor-mode eshell-hist-mode
-  "Minor mode for the eshell-hist module.
-
-\\{eshell-hist-mode-map}"
-  :keymap eshell-hist-mode-map)
-
 (defun eshell-hist-initialize ()    ;Called from `eshell-mode' via intern-soft!
   "Initialize the history management code for one Eshell buffer."
   (when (eshell-using-module 'eshell-cmpl)
@@ -274,7 +242,30 @@ Returns nil if INPUT is prepended by blank space, 
otherwise non-nil."
                   (lambda ()
                     (setq overriding-terminal-local-map nil)))
                   nil t))
-    (eshell-hist-mode))
+    (define-key eshell-mode-map [up] 
'eshell-previous-matching-input-from-input)
+    (define-key eshell-mode-map [down] 'eshell-next-matching-input-from-input)
+    (define-key eshell-mode-map [(control up)] 'eshell-previous-input)
+    (define-key eshell-mode-map [(control down)] 'eshell-next-input)
+    (define-key eshell-mode-map [(meta ?r)] 'eshell-previous-matching-input)
+    (define-key eshell-mode-map [(meta ?s)] 'eshell-next-matching-input)
+    (define-key eshell-command-map [(meta ?r)]
+      'eshell-previous-matching-input-from-input)
+    (define-key eshell-command-map [(meta ?s)]
+      'eshell-next-matching-input-from-input)
+    (if eshell-hist-match-partial
+       (progn
+         (define-key eshell-mode-map [(meta ?p)]
+           'eshell-previous-matching-input-from-input)
+         (define-key eshell-mode-map [(meta ?n)]
+           'eshell-next-matching-input-from-input)
+         (define-key eshell-command-map [(meta ?p)] 'eshell-previous-input)
+         (define-key eshell-command-map [(meta ?n)] 'eshell-next-input))
+      (define-key eshell-mode-map [(meta ?p)] 'eshell-previous-input)
+      (define-key eshell-mode-map [(meta ?n)] 'eshell-next-input)
+      (define-key eshell-command-map [(meta ?p)]
+       'eshell-previous-matching-input-from-input)
+      (define-key eshell-command-map [(meta ?n)]
+       'eshell-next-matching-input-from-input)))
 
   (make-local-variable 'eshell-history-size)
   (or eshell-history-size
@@ -309,7 +300,10 @@ Returns nil if INPUT is prepended by blank space, 
otherwise non-nil."
   (add-hook 'kill-emacs-hook #'eshell-save-some-history)
 
   (make-local-variable 'eshell-input-filter-functions)
-  (add-hook 'eshell-input-filter-functions #'eshell-add-to-history nil t))
+  (add-hook 'eshell-input-filter-functions #'eshell-add-to-history nil t)
+
+  (define-key eshell-command-map [(control ?l)] 'eshell-list-history)
+  (define-key eshell-command-map [(control ?x)] 'eshell-get-next-from-history))
 
 (defun eshell-save-some-history ()
   "Save the history for any open Eshell buffers."
diff --git a/lisp/eshell/em-pred.el b/lisp/eshell/em-pred.el
index 04bf3ff..ee4b28f 100644
--- a/lisp/eshell/em-pred.el
+++ b/lisp/eshell/em-pred.el
@@ -229,12 +229,6 @@ FOR LISTS OF ARGUMENTS:
 EXAMPLES:
   *.c(:o)  sorted list of .c files")
 
-(defvar eshell-pred-mode-map
-  (let ((map (make-sparse-keymap)))
-    (define-key map (kbd "C-c M-q") #'eshell-display-predicate-help)
-    (define-key map (kbd "C-c M-m") #'eshell-display-modifier-help)
-    map))
-
 ;;; Functions:
 
 (defun eshell-display-predicate-help ()
@@ -251,17 +245,12 @@ EXAMPLES:
     (lambda ()
       (insert eshell-modifier-help-string)))))
 
-(define-minor-mode eshell-pred-mode
-  "Minor mode for the eshell-pred module.
-
-\\{eshell-pred-mode-map}"
-  :keymap eshell-pred-mode-map)
-
 (defun eshell-pred-initialize ()    ;Called from `eshell-mode' via intern-soft!
   "Initialize the predicate/modifier code."
   (add-hook 'eshell-parse-argument-hook
            #'eshell-parse-arg-modifier t t)
-  (eshell-pred-mode))
+  (define-key eshell-command-map [(meta ?q)] 'eshell-display-predicate-help)
+  (define-key eshell-command-map [(meta ?m)] 'eshell-display-modifier-help))
 
 (defun eshell-apply-modifiers (lst predicates modifiers)
   "Apply to LIST a series of PREDICATES and MODIFIERS."
diff --git a/lisp/eshell/em-prompt.el b/lisp/eshell/em-prompt.el
index 9ae5ae1..bbf3b94 100644
--- a/lisp/eshell/em-prompt.el
+++ b/lisp/eshell/em-prompt.el
@@ -97,20 +97,8 @@ arriving, or after."
   :options '(eshell-show-maximum-output)
   :group 'eshell-prompt)
 
-(defvar eshell-prompt-mode-map
-  (let ((map (make-sparse-keymap)))
-    (define-key map (kbd "C-c C-n") #'eshell-next-prompt)
-    (define-key map (kbd "C-c C-p") #'eshell-previous-prompt)
-    map))
-
 ;;; Functions:
 
-(define-minor-mode eshell-prompt-mode
-  "Minor mode for eshell-prompt module.
-
-\\{eshell-prompt-mode-map}"
-  :keymap eshell-prompt-mode-map)
-
 (defun eshell-prompt-initialize ()  ;Called from `eshell-mode' via intern-soft!
   "Initialize the prompting code."
   (unless eshell-non-interactive-p
@@ -122,7 +110,9 @@ arriving, or after."
 
     (set (make-local-variable 'eshell-skip-prompt-function)
         'eshell-skip-prompt)
-    (eshell-prompt-mode)))
+
+    (define-key eshell-command-map [(control ?n)] 'eshell-next-prompt)
+    (define-key eshell-command-map [(control ?p)] 'eshell-previous-prompt)))
 
 (defun eshell-emit-prompt ()
   "Emit a prompt if eshell is being used interactively."
diff --git a/lisp/eshell/em-rebind.el b/lisp/eshell/em-rebind.el
index bf5a4bf..85593e4 100644
--- a/lisp/eshell/em-rebind.el
+++ b/lisp/eshell/em-rebind.el
@@ -137,11 +137,6 @@ This is default behavior of shells like bash."
   :type '(repeat function)
   :group 'eshell-rebind)
 
-(defvar eshell-rebind-mode-map
-  (let ((map (make-sparse-keymap)))
-    (define-key map (kbd "C-c M-l") #'eshell-lock-local-map)
-    map))
-
 ;; Internal Variables:
 
 (defvar eshell-input-keymap)
@@ -150,12 +145,6 @@ This is default behavior of shells like bash."
 
 ;;; Functions:
 
-(define-minor-mode eshell-rebind-mode
-  "Minor mode for the eshell-rebind module.
-
-\\{eshell-rebind-mode-map}"
-  :keymap eshell-rebind-mode-map)
-
 (defun eshell-rebind-initialize ()  ;Called from `eshell-mode' via intern-soft!
   "Initialize the inputting code."
   (unless eshell-non-interactive-p
@@ -165,7 +154,7 @@ This is default behavior of shells like bash."
     (make-local-variable 'overriding-local-map)
     (add-hook 'post-command-hook 'eshell-rebind-input-map nil t)
     (set (make-local-variable 'eshell-lock-keymap) nil)
-    (eshell-rebind-mode)))
+    (define-key eshell-command-map [(meta ?l)] 'eshell-lock-local-map)))
 
 (defun eshell-lock-local-map (&optional arg)
   "Lock or unlock the current local keymap.
diff --git a/lisp/eshell/esh-arg.el b/lisp/eshell/esh-arg.el
index e7b07b4..86ceb41 100644
--- a/lisp/eshell/esh-arg.el
+++ b/lisp/eshell/esh-arg.el
@@ -155,22 +155,14 @@ treated as a literal character."
   :type 'hook
   :group 'eshell-arg)
 
-(defvar eshell-arg-mode-map
-  (let ((map (make-sparse-keymap)))
-    (define-key map (kbd "C-c M-b") #'eshell-insert-buffer-name)
-    map))
-
 ;;; Functions:
 
-(define-minor-mode eshell-arg-mode
-  "Minor mode for the arg eshell module.
-
-\\{eshell-arg-mode-map}"
-  :keymap eshell-arg-mode-map)
-
 (defun eshell-arg-initialize ()     ;Called from `eshell-mode' via intern-soft!
   "Initialize the argument parsing code."
-  (eshell-arg-mode)
+  ;; This is supposedly run after enabling esh-mode, when eshell-mode-map
+  ;; already exists.
+  (defvar eshell-command-map)
+  (define-key eshell-command-map [(meta ?b)] 'eshell-insert-buffer-name)
   (set (make-local-variable 'eshell-inside-quote-regexp) nil)
   (set (make-local-variable 'eshell-outside-quote-regexp) nil))
 
diff --git a/lisp/eshell/esh-mode.el b/lisp/eshell/esh-mode.el
index d0147b3..db5fddb 100644
--- a/lisp/eshell/esh-mode.el
+++ b/lisp/eshell/esh-mode.el
@@ -213,7 +213,10 @@ This is used by `eshell-watch-for-password-prompt'."
 ;; these are only set to nil initially for the sake of the
 ;; byte-compiler, when compiling other files which `require' this one
 (defvar eshell-mode nil)
+(defvar eshell-mode-map nil)
 (defvar eshell-command-running-string "--")
+(defvar eshell-command-map nil)
+(defvar eshell-command-prefix nil)
 (defvar eshell-last-input-start nil)
 (defvar eshell-last-input-end nil)
 (defvar eshell-last-output-start nil)
@@ -277,32 +280,6 @@ This is used by `eshell-watch-for-password-prompt'."
      (standard-syntax-table))
     st))
 
-(defvar eshell-mode-map
-  (let ((map (make-sparse-keymap)))
-    (define-key map [(control ?c)] 'eshell-command-map)
-    (define-key map "\r" #'eshell-send-input)
-    (define-key map "\M-\r" #'eshell-queue-input)
-    (define-key map [(meta control ?l)] #'eshell-show-output)
-    (define-key map [(control ?a)] #'eshell-bol)
-    map))
-
-(defvar eshell-command-map
-  (let ((map (define-prefix-command 'eshell-command-map)))
-    (define-key map [(meta ?o)] #'eshell-mark-output)
-    (define-key map [(meta ?d)] #'eshell-toggle-direct-send)
-    (define-key map [(control ?a)] #'eshell-bol)
-    (define-key map [(control ?b)] #'eshell-backward-argument)
-    (define-key map [(control ?e)] #'eshell-show-maximum-output)
-    (define-key map [(control ?f)] #'eshell-forward-argument)
-    (define-key map [(control ?m)] #'eshell-copy-old-input)
-    (define-key map [(control ?o)] #'eshell-kill-output)
-    (define-key map [(control ?r)] #'eshell-show-output)
-    (define-key map [(control ?t)] #'eshell-truncate-buffer)
-    (define-key map [(control ?u)] #'eshell-kill-input)
-    (define-key map [(control ?w)] #'backward-kill-word)
-    (define-key map [(control ?y)] #'eshell-repeat-argument)
-    map))
-
 ;;; User Functions:
 
 (defun eshell-kill-buffer-function ()
@@ -321,6 +298,10 @@ and the hook `eshell-exit-hook'."
   "Emacs shell interactive mode."
   (setq-local eshell-mode t)
 
+  ;; FIXME: What the hell!?
+  (setq-local eshell-mode-map (make-sparse-keymap))
+  (use-local-map eshell-mode-map)
+
   (when eshell-status-in-mode-line
     (make-local-variable 'eshell-command-running-string)
     (let ((fmt (copy-sequence mode-line-format)))
@@ -329,6 +310,31 @@ and the hook `eshell-exit-hook'."
       (if mode-line-elt
          (setcar mode-line-elt 'eshell-command-running-string))))
 
+  (define-key eshell-mode-map "\r" 'eshell-send-input)
+  (define-key eshell-mode-map "\M-\r" 'eshell-queue-input)
+  (define-key eshell-mode-map [(meta control ?l)] 'eshell-show-output)
+  (define-key eshell-mode-map [(control ?a)] 'eshell-bol)
+
+  (setq-local eshell-command-prefix (make-symbol "eshell-command-prefix"))
+  (fset eshell-command-prefix (make-sparse-keymap))
+  (setq-local eshell-command-map (symbol-function eshell-command-prefix))
+  (define-key eshell-mode-map [(control ?c)] eshell-command-prefix)
+
+  (define-key eshell-command-map [(meta ?o)] 'eshell-mark-output)
+  (define-key eshell-command-map [(meta ?d)] 'eshell-toggle-direct-send)
+
+  (define-key eshell-command-map [(control ?a)] 'eshell-bol)
+  (define-key eshell-command-map [(control ?b)] 'eshell-backward-argument)
+  (define-key eshell-command-map [(control ?e)] 'eshell-show-maximum-output)
+  (define-key eshell-command-map [(control ?f)] 'eshell-forward-argument)
+  (define-key eshell-command-map [(control ?m)] 'eshell-copy-old-input)
+  (define-key eshell-command-map [(control ?o)] 'eshell-kill-output)
+  (define-key eshell-command-map [(control ?r)] 'eshell-show-output)
+  (define-key eshell-command-map [(control ?t)] 'eshell-truncate-buffer)
+  (define-key eshell-command-map [(control ?u)] 'eshell-kill-input)
+  (define-key eshell-command-map [(control ?w)] 'backward-kill-word)
+  (define-key eshell-command-map [(control ?y)] 'eshell-repeat-argument)
+
   (setq local-abbrev-table eshell-mode-abbrev-table)
 
   (set (make-local-variable 'list-buffers-directory)
diff --git a/lisp/eshell/esh-proc.el b/lisp/eshell/esh-proc.el
index d2c17fe..c3ac3a5 100644
--- a/lisp/eshell/esh-proc.el
+++ b/lisp/eshell/esh-proc.el
@@ -109,16 +109,6 @@ information, for example."
 (defvar eshell-process-list nil
   "A list of the current status of subprocesses.")
 
-(defvar eshell-proc-mode-map
-  (let ((map (make-sparse-keymap)))
-    (define-key map (kbd "C-c M-i") #'eshell-insert-process)
-    (define-key map (kbd "C-c C-c") #'eshell-interrupt-process)
-    (define-key map (kbd "C-c C-k") #'eshell-kill-process)
-    (define-key map (kbd "C-c C-d") #'eshell-send-eof-to-process)
-    (define-key map (kbd "C-c C-s") #'list-processes)
-    (define-key map (kbd "C-c C-\\") #'eshell-quit-process)
-    map))
-
 ;;; Functions:
 
 (defun eshell-kill-process-function (proc status)
@@ -131,16 +121,20 @@ PROC and STATUS to functions on the latter."
   (eshell-reset-after-proc status)
   (run-hook-with-args 'eshell-kill-hook proc status))
 
-(define-minor-mode eshell-proc-mode
-  "Minor mode for the proc eshell module.
-
-\\{eshell-proc-mode-map}"
-  :keymap eshell-proc-mode-map)
-
 (defun eshell-proc-initialize ()    ;Called from `eshell-mode' via intern-soft!
   "Initialize the process handling code."
   (make-local-variable 'eshell-process-list)
-  (eshell-proc-mode))
+  ;; This is supposedly run after enabling esh-mode, when eshell-command-map
+  ;; already exists.
+  (defvar eshell-command-map)
+  (define-key eshell-command-map [(meta ?i)] 'eshell-insert-process)
+  (define-key eshell-command-map [(control ?c)]  'eshell-interrupt-process)
+  (define-key eshell-command-map [(control ?k)]  'eshell-kill-process)
+  (define-key eshell-command-map [(control ?d)]  'eshell-send-eof-to-process)
+; (define-key eshell-command-map [(control ?q)]  'eshell-continue-process)
+  (define-key eshell-command-map [(control ?s)]  'list-processes)
+; (define-key eshell-command-map [(control ?z)]  'eshell-stop-process)
+  (define-key eshell-command-map [(control ?\\)] 'eshell-quit-process))
 
 (defun eshell-reset-after-proc (status)
   "Reset the command input location after a process terminates.
diff --git a/lisp/eshell/esh-var.el b/lisp/eshell/esh-var.el
index 327a1de..75ccf5b 100644
--- a/lisp/eshell/esh-var.el
+++ b/lisp/eshell/esh-var.el
@@ -197,19 +197,8 @@ function), and the arguments passed to this function would 
be the list
 
 (put 'eshell-variable-aliases-list 'risky-local-variable t)
 
-(defvar eshell-var-mode-map
-  (let ((map (make-sparse-keymap)))
-    (define-key map (kbd "C-c M-v") #'eshell-insert-envvar)
-    map))
-
 ;;; Functions:
 
-(define-minor-mode eshell-var-mode
-  "Minor mode for the esh-var module.
-
-\\{eshell-var-mode-map}"
-  :keymap eshell-var-mode-map)
-
 (defun eshell-var-initialize ()     ;Called from `eshell-mode' via intern-soft!
   "Initialize the variable handle code."
   ;; Break the association with our parent's environment.  Otherwise,
@@ -218,6 +207,11 @@ function), and the arguments passed to this function would 
be the list
     (set (make-local-variable 'process-environment)
         (eshell-copy-environment)))
 
+  ;; This is supposedly run after enabling esh-mode, when eshell-command-map
+  ;; already exists.
+  (defvar eshell-command-map)
+  (define-key eshell-command-map [(meta ?v)] 'eshell-insert-envvar)
+
   (set (make-local-variable 'eshell-special-chars-inside-quoting)
        (append eshell-special-chars-inside-quoting '(?$)))
   (set (make-local-variable 'eshell-special-chars-outside-quoting)