Custom eshell prompt

my-prompt.el

(defvar my-eshell-command-count 0
  "Variable to keep track of command count")

;; very important if you have multiple eshell buffers open
(make-variable-buffer-local 'my-eshell-command-count)

(defun my-increment-eshell-command-count ()
  "Increments the eshell command count var."
  (incf my-eshell-command-count))

(defun color-me (text color &optional bg-color)
  "Color TEXT with a foreground of COLOR and background of BG-COLOR if given."
  (propertize text 'face (list :foreground color :background bg-color)))

(defun my-eshell-prompt ()
  "Custom eshell prompt function."
  (concat
   (color-me (abbreviate-file-name (eshell/pwd)) "skyblue")
   " "
   (color-me "[" "gray70")
   (color-me (int-to-string my-eshell-command-count) "orange")
   (color-me ":" "gray70")
   (color-me (int-to-string (if (numberp eshell-last-command-status) eshell-last-command-status 0))
             (if (zerop eshell-last-command-status) "olivedrab" "firebrick"))
   (color-me "]" "gray70")
   " "
   (color-me "->" "magenta")
   "\n "
   (color-me "$" "purple")
   " "))

(defun my-eshell-setup ()
  ;; this shell colors itself, no need to highlight
  (setq eshell-highlight-prompt nil)
  ;; use the custom prompt
  (setq eshell-prompt-function 'my-eshell-prompt)
  ;; make sure we increment the custom count var after each prompt
  (add-hook 'eshell-after-prompt-hook 'my-increment-eshell-command-count))

(my-eshell-setup)
(add-hook 'eshell-mode-hook 'my-eshell-setup)

Thanks. Neat idea to track last command count.

You might also be interested in some improvements from https://emacs.stackexchange.com/a/33408/15023.