Structure and Interpretation of Classical Mechanics
Scheme Mechanics Installation for GNU/Linux
This post assumes that you have already installed the
scmutils library and been able to open it using the standard editor
If not, go to the bottom of this post to click the category
scmutils, so that you can see all the posts in this
Then go to the post “
scmutils, 2.3.2” to follow the installation and setup instructions.
After installing and setting up the
scmutils library, you can start to use it.
However, what if you want to close the
Emacs editor? How to save your
scheme program before closing
By default, you cannot. So I have written a small program to help. Here is the installation instruction:
1. Go to the end of the
.emacs file. Add the following code, if it does not already exist:
(defun mechanics() (interactive) (run-scheme "/usr/local/scmutils/mit-scheme/bin/scheme --library /usr/local/scmutils/mit-scheme/lib" ))
2. Add the following code:
(fset 'set-working-dir (lambda (&optional arg) "Keyboard macro." (interactive "p") (kmacro-exec-ring-item (quote ("(set-working-directory-pathname! \"~/Documents/\")\n" 0 "%d")) arg))) (fset 'load-scm (lambda (&optional arg) "Keyboard macro." (interactive "p") (kmacro-exec-ring-item (quote ("(load \"tt.scm\")" 0 "%d")) arg))) (defun mechan () (interactive) (split-window-below) (windmove-down) (mechanics) (set-working-dir) (comint-send-input) (windmove-up) (find-file "~/Documents/tt.scm") (end-of-buffer) (windmove-down) (cond ((file-exists-p "~/Documents/tt.scm") (interactive) (load-scm) (comint-send-input))) (windmove-up) ) (defun cxce () (interactive) (save-buffer) (windmove-down) (load-scm) (comint-send-input) (windmove-up) ) (global-set-key (kbd "C-x C-e") 'cxce)
Emacs. Re-open it.
4. Type the command
M-x means pressing the
Alt key and
x together. Then type the word
5. You will see the
Emacs editor is split into two windows, one up and one down.
The lower window is the
scheme environment. You can type a line of code and the press
Enter to execute it.
The upper window is the editor. You can type multiple lines of code and the type
to execute it. The command
C-x C-e means pressing
x together and then
scheme code is saved to the following file
In case you need to backup your code, backup this file.
— Me@2020-03-10 10:59:45 PM
2020.03.10 Tuesday (c) All rights reserved by ACHK