How does one get the prompt (>) in the Edwin editor for MIT/GNU Scheme?

Question

Nomally, you will get a prompt like this:

=>

where you can type in expressions for evaluation:

=> (+ 3 4)
7

But with Edwin, there is only a blinking black rectangle and nothing happens when you type in expressions.

Answer 1

After installing and running the MIT-GNU Scheme from the Start menu, you get two windows, Edwin *scheme* and MIT/GNU Scheme. Go to the second window and press Ctrl+U. You should get the 1 ]=> prompt right away.

Answer 2

EDIT: In this manual:

• http://www.gnu.org/software/mit-scheme/documentation/mit-scheme-user.pdf

section 7.5, it says:

When Edwin starts, it has one buffer: a REPL buffer called ‘*scheme*’. The command M-x repl selects this buffer, if it exists; otherwise it creates a new REPL buffer. If you want two REPL buffers, just rename the ‘*scheme*’ buffer to something else and run M-x repl again.

You can use the following also (see section 7.4 from the manual):

• C-x C-e - evaluate s-exp before the cursor
• M-z - evaluate the whole definition containing the cursor
• M-: - evaluate from mini-buffer
• C-M-z - evaluate the whole region
• M-o - evaluate the whole buffer

(C stands for Ctrl, M for Alt on PC keyboards).

Never used it, but from this:

• http://www.cs.rpi.edu/academics/courses/fall99/ai/scheme/scheme.html

you should be able to get the prompt by M-x run-scheme (M-x stand for Alt-X on today's keyboards).

Answer 3

On Windows "C:\Program Files (x86)\MIT-GNU Scheme\bin\mit-scheme.exe" --library "C:\Program Files (x86)\MIT-GNU Scheme\lib" --edit starts Edwin, whereas "C:\Program Files (x86)\MIT-GNU Scheme\bin\mit-scheme.exe" --library "C:\Program Files (x86)\MIT-GNU Scheme\lib" gives you a repl prompt