How can I get Emacs to revert all unchanged buffers when switching branches in git?
Perhaps you’d like the global auto-revert mode. Try running global-auto-revert-mode and if you like it you can add (global-auto-revert-mode) to your ~/.emacs file.
elisp
Concatenate strings in elisp
You can use (concat “foo” “bar”) rather than (concatenate ‘string “foo” “bar”). Both work, but of course the former is shorter.
How to live with Emacs Lisp dynamic scoping?
It isn’t that bad. The main problems can appear with ‘free variables’ in functions. (defun foo (a) (* a b)) In above function a is a local variable. b is a free variable. In a system with dynamic binding like Emacs Lisp, b will be looked up at runtime. There are now three cases: b … Read more
emacs lisp, how to get buffer major mode?
Is there a problem with that? (defun buffer-mode (buffer-or-string) “Returns the major mode associated with a buffer.” (with-current-buffer buffer-or-string major-mode)) with-current-buffer will restore your buffer when it returns.
REPL for Emacs Lisp
Based on this question: REPL on console emacs, you can use M-x ielm (inferior emacs lisp mode).
How to debug elisp?
The debugger (edebug) is pretty straight forward to use. Go to the definition of the function, and type M-x edebug-defun. The next time it is called, you’ll be able to step through the code as with every other debugger. Type ? for the list of keybindings, or check out the documentation for edebug.
What is the correct way to join multiple path components into a single complete path in emacs lisp?
Reading through the manual for Directory Names, you’ll find the answer: Given a directory name, you can combine it with a relative file name using concat: (concat dirname relfile) Be sure to verify that the file name is relative before doing that. If you use an absolute file name, the results could be syntactically invalid … Read more
How do I create an empty file in emacs?
You can use the touch command: M-! touch __init__.py RET
How can I check if a file exists using Emacs Lisp?
try file-exists-p “Return t if file filename exists (whether or not you can read it.)”. Note that it’s not spesific to files and works for directories too.
Filtering text through a shell command in Emacs
You can select a region and type `C-u M-| command RET’, and it replaces the region with the command output in the same buffer due to the interactive prefix argument of shell-command-on-region.