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;;; eshell-prompt.el --- Generating a good prompt for Eshell -*- lexical-binding: t; -*-
;; Copyright (C) 2024 Aryadev Chavali
;; Author: Aryadev Chavali <aryadev@aryadevchavali.com>
;; Keywords:
;; This program is free software; you can redistribute it and/or
;; modify it under the terms of the GNU General Public License Version
;; 2 as published by the Free Software Foundation.
;; This program is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;; GNU General Public License for more details.
;; You should have received a copy of the GNU General Public License
;; along with this program. If not, see <https://www.gnu.org/licenses/>.
;;; Commentary:
;; We provide a function ep which generates a prompt on
;; demand.
;;; Code:
(defvar ep/user-prompt " λ "
"Prompt for user to input.")
(defvar ep/dir-colour "deepskyblue")
(defvar ep/success-colour "forestgreen")
(defvar ep/failure-colour "red")
(defvar ep/branch-name-colour "LightSalmon")
(defvar ep/pipe-colour "green2")
(defvar ep/ahead-colour "dodger blue")
(defvar ep/remote-colour "DarkGoldenrod")
(defun ep/--colour-on-last-command ()
"Returns an Emacs colour based on ESHELL-LAST-COMMAND-STATUS."
(if (zerop eshell-last-command-status)
ep/success-colour
ep/failure-colour))
(defun ep/--git-remote-status ()
"Returns a propertized string for the status of a repository
in comparison to its remote. 3 differing strings are returned
dependent on:
- Is it equivalent to the remote?
- Is it ahead of the remote?
- Is it behind the remote?
The latter 2 also have a number for exactly how many commits
behind or ahead the local repository is."
(let* ((git-cmd "git status | grep 'Your branch is'")
(branch-status (split-string (shell-command-to-string git-cmd)))
(status (nth 3 branch-status))
(diff (cl-position "by" branch-status :test #'string=)))
(if (null diff)
(propertize "=" 'font-lock-face `(:foreground ,ep/success-colour))
(let ((n (nth (+ 1 diff) branch-status)))
(concat
(cond
((string= status "ahead")
(propertize "→" 'font-lock-face `(:foreground ,ep/ahead-colour)))
((string= status "behind")
(propertize "←" 'font-lock-face `(:foreground ,ep/failure-colour))))
n)))))
(defun ep/--git-change-status ()
"Returns a propertized string for the condition of the worktree in
a repository. If there are no changes i.e. the worktree is clean
then a green tick is returned, but if there are changes then the
number of files affected are returned in red."
(let* ((git-cmd "git status -s")
(command-output (split-string (shell-command-to-string git-cmd) "\n"))
(changed-files (- (length command-output) 1)))
(if (= changed-files 0)
(propertize "✓"
'font-lock-face
`(:foreground ,ep/success-colour))
(propertize (number-to-string changed-files)
'font-lock-face
`(:foreground ,ep/failure-colour)))))
(defun ep/--git-branch-name ()
"Get the branch name of the current working directory. W"
(let* ((branch-name (thread-last
(split-string (shell-command-to-string "git branch") "\n")
(cl-remove-if (lambda (s) (= (length s) 0)))
(cl-find-if (lambda (s) (string= "*" (substring s 0 1))))))
(branch-name (if (null branch-name) nil
(substring branch-name 2))))
(cond
((null branch-name) nil)
((string= "(" (substring branch-name 0 1))
(replace-regexp-in-string
"\n$" ""
(shell-command-to-string "git rev-parse --short HEAD")))
(t branch-name))))
(defun ep/--git-status ()
"Returns a completely formatted string of
form (BRANCH-NAME<CHANGES>[REMOTE-STATUS])."
(let ((git-branch (ep/--git-branch-name)))
(if (null git-branch)
""
(format
"%s(%s)(%s)"
(propertize git-branch 'font-lock-face `(:foreground ,ep/branch-name-colour))
(ep/--git-remote-status)
(ep/--git-change-status)))))
(defun ep/--user-and-remote ()
(if (file-remote-p default-directory)
(let ((user (file-remote-p default-directory 'user))
(host (file-remote-p default-directory 'host)))
(if user
(format "%s@%s " user host)
(concat host " ")))
""))
(defun ep/make-prompt ()
(let ((git (ep/--git-status)))
(mapconcat
(lambda (item)
(if (listp item)
(propertize (car item)
'font-lock-face (cdr item)
'front-sticky '(font-lock-face read-only)
'rear-nonsticky '(font-lock-face read-only))
item))
(list
`("┌──"
:foreground ,ep/pipe-colour)
"["
`(,(ep/--user-and-remote)
:foreground ,ep/remote-colour)
`(,(abbreviate-file-name (tramp-file-local-name (eshell/pwd)))
:foreground ,ep/dir-colour)
(if (string= git "")
""
(concat "]─[" git))
"]"
"\n"
`("└─>"
:foreground ,ep/pipe-colour)
(list ep/user-prompt ':foreground (ep/--colour-on-last-command))))))
(provide 'eshell-prompt)
;;; eshell-prompt.el ends here
;; Local Variables:
;; read-symbol-shorthands: (("ep" . "+eshell-prompt"))
;; End:
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