(Emacs/config|elisp)~rework Eshell

Now I have separate modules for the additional new functions I
introduced for eshell and for the prompt function I made.  Cleans up
the configuration a bit and makes it easier to examine those files on
their own, which I expect to grow.

Emacs/.config/emacs/elisp/eshell-additions.el

@@ -0,0 +1,57 @@
+;;; eshell-additions.el --- Some aliases 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 as published by
+;; the Free Software Foundation version 2 of the License
+
+;; 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:
+
+;;
+
+;;; Code:
+
+(autoload #'eshell/cd "eshell")
+(autoload #'eshell/echo "eshell")
+(autoload #'eshell/send-input "eshell")
+
+;; Aliases
+(defun eshell/goto (&rest args)
+  "Use `read-directory-name' to change directories"
+  (eshell/cd (list (read-directory-name "Directory?: "))))
+
+(defun eshell/project-root (&rest args)
+  "Change to directory `project-root'"
+  (if (project-current)
+      (eshell/cd (list (project-root (project-current))))
+    (let ((error-msg (propertize "Error" 'font-lock-face
+                                 '(:foreground "red"))))
+      (eshell/echo
+       (format "[%s]: No project in current directory" error-msg)))))
+
+;; Additional functions
+(defun +eshell/at-cwd ()
+  "Open an instance of eshell at the current working directory."
+  (interactive)
+  (let ((dir (if buffer-file-name
+                 (file-name-directory buffer-file-name)
+               default-directory))
+        (buf (eshell)))
+    (with-current-buffer buf
+      (eshell/cd dir)
+      (eshell-send-input))))
+
+(provide 'eshell-additions)
+;;; eshell-additions.el ends here