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I am fairly new to emacs and I want to learn emacs Lisp. In particular, is it possible to write elisp functions in, say, the scratch buffer to do some complex text-processing on my program file example.cpp whose buffer I would have open in another frame.
Indeed if I could write some elisp code to do text-processing across all the files in the project folder that would be even better!
I am using Spacemacs
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Yes you can! (If you mean frame what Emacs think it is.)
To demonstrate, do the following steps:
This will put you into the *scratch* buffer.
M-x make-frame-command to create a new frame, which is also in *scratch*.
example.cppSo that you can now see both *scratch* buffer in the first frame and example.cpp in the newly created frame, side by side.
Copy the following code and past it into the *scratch* buffer.
(with-current-buffer "example.cpp"
(insert "Hello, Emacs!\n"))
Put your cursor after the last ) and do M-x eval-last-sexp. If you see "Hello, Emacs!" in the other frame, you got the first step right. You can now customize the code to suite your needs.
with-current-buffer. Once you know how to act on a desired buffer, you feel you passed the hardest cliff of leaning elisp and see the huge possibilities. – Yasushi Shoji Feb 9 '16 at 6:18