My Emacs configuration.
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.emacs.d/site-lisp/db-eshell.el

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;;; db-eshell --- Configuration for eshell
;;; Commentary:
;;; Code:
;; Setup
(require 'em-prompt)
(require 'em-term)
(require 'em-cmpl)
;; Customization
(setq eshell-cmpl-cycle-completions nil
eshell-scroll-to-bottom-on-input t
eshell-prefer-lisp-functions nil)
(setenv "PAGER" "cat")
(defun eshell-clear-buffer ()
"Clear terminal."
(interactive)
(let ((inhibit-read-only t))
(erase-buffer)
(eshell-send-input)))
;; eshell is a bit strange and sets up its mode map as a local map;
;; because of this we need to put key definitions into a hook
(add-hook 'eshell-mode-hook
(lambda ()
(bind-key "C-a" #'eshell-bol eshell-mode-map)
(bind-key "C-l" #'eshell-clear-buffer eshell-mode-map)))
(add-to-list 'eshell-command-completions-alist
'("gunzip" "gz\\'"))
(add-to-list 'eshell-command-completions-alist
'("tar" "\\(\\.tar|\\.tgz\\|\\.tar\\.gz\\)\\'"))
(setq eshell-prompt-function
(lambda ()
(concat
"[" (user-login-name)
"@" (getenv "HOST")
":" (abbreviate-file-name (eshell/pwd))
"]\n"))
eshell-prompt-regexp
"^→ ")
(add-hook 'eshell-mode-hook
(lambda ()
(add-hook 'eshell-output-filter-functions 'eshell-truncate-buffer)))
;; Git Completion
;; https://tsdh.wordpress.com/2013/05/31/eshell-completion-for-git-bzr-and-hg/
(require 'pcomplete)
(defun pcmpl-git-commands ()
"Return the most common git commands by parsing the git output."
(with-temp-buffer
(call-process "git" nil (current-buffer) nil "help" "--all")
(goto-char 0)
(search-forward "available git commands in")
(let (commands)
(while (re-search-forward
"^[[:blank:]]+\\([[:word:]-.]+\\)[[:blank:]]*\\([[:word:]-.]+\\)?"
nil t)
(push (match-string 1) commands)
(when (match-string 2)
(push (match-string 2) commands)))
(sort commands #'string<))))
(defconst pcmpl-git-commands (pcmpl-git-commands)
"List of `git' commands.")
(defvar pcmpl-git-ref-list-cmd "git for-each-ref refs/ --format='%(refname)'"
"The `git' command to run to get a list of refs.")
(defun pcmpl-git-get-refs (type)
"Return a list of `git' refs filtered by TYPE."
(with-temp-buffer
(insert (shell-command-to-string pcmpl-git-ref-list-cmd))
(goto-char (point-min))
(let (refs)
(while (re-search-forward (concat "^refs/" type "/\\(.+\\)$") nil t)
(push (match-string 1) refs))
(nreverse refs))))
(defun pcmpl-git-remotes ()
"Return a list of remote repositories."
(split-string (shell-command-to-string "git remote")))
(defun pcomplete/git ()
"Completion for `git'."
;; Completion for the command argument.
(pcomplete-here* pcmpl-git-commands)
(cond
((pcomplete-match "help" 1)
(pcomplete-here* pcmpl-git-commands))
((pcomplete-match (regexp-opt '("pull" "push")) 1)
(pcomplete-here (pcmpl-git-remotes)))
;; provide branch completion for the command `checkout'.
((pcomplete-match (regexp-opt '("checkout" "co")) 1)
(pcomplete-here* (append (pcmpl-git-get-refs "heads")
(pcmpl-git-get-refs "tags"))))
(t
(while (pcomplete-here (pcomplete-entries))))))
;; End
(provide 'db-eshell)
;;; db-eshell ends here