Juvix Emacs mode tutorial¶
First, follow the instructions in the Emacs Mode
Reference to install the Juvix Emacs
mode. Once you've successfully set it up, create a file Hello.juvix
with the following content.
Type Ctrl+C+Ctrl+L to run the scoper and highlight the syntax.
If you make a mistake in your program, it is automatically underlined in red with the error message popping up when you hover the mouse pointer over the underlined part.
For example, in the following program the identifier printStringLna
should be underlined with the error message "Symbol not in scope".
module Hello;
open import Stdlib.Prelude;
main : IO;
main := printStringLna "Hello world!";
end;
If error underlining doesn't work, make sure you have the flycheck
mode turned on. It should be turned on automatically when loading
juvix-mode
, but in case this doesn't work you can enable it with
M-x flycheck-mode
.
Let's extend our program with another definition.
module Hello;
import Stdlib.Prelude open;
main : IO := printStringLn "Hello world!";
end;
Place the cursor on the print
call in the function clause of main
and press M-.
. The cursor will jump to the definition of print
above. This also works across files and for definitions from the
standard library. You can try using M-.
to jump to the definition of
printStringLn
.
One more feature of the Juvix Emacs mode is code formatting. To format the content of the current buffer, type Ctrl+C+Ctrl+F.