# -*- eval: (visual-line-mode 1) -*-
#+STARTUP: showall

[[https://melpa.org/#/julia-vterm][file:https://melpa.org/packages/julia-vterm-badge.svg]] [[https://stable.melpa.org/#/julia-vterm][file:https://stable.melpa.org/packages/julia-vterm-badge.svg]]

* julia-vterm

Julia-vterm provides a major-mode for an inferior Julia process (or REPL) that runs in vterm, and a minor-mode that extends julia-mode with the ability to interact with the inferior Julia process.

The functionalities required for typical REPL interaction have been implemented. While I would like to keep this package simple, suggestions are always welcome.

If you want to use Julia with [[https://orgmode.org/worg/org-contrib/babel/][Org Babel]], please consider trying [[https://github.com/shg/ob-julia-vterm.el][ob-julia-vterm]]. It uses julia-vterm and provides a solid babel development experience with session and asynchronous execution support.

** Installation

You can install this package from MELPA. The package name is “julia-vterm”.

For manual installation, download =julia-vterm.el= into somewhere in your local directory and use =package-install-file= command. Please make sure [[https://github.com/JuliaEditorSupport/julia-emacs][julia-mode]] and [[https://github.com/akermu/emacs-libvterm][emacs-libvterm]] are installed and configured correctly.

Turn on =julia-vterm-mode= in a =julia-mode= buffer to use this package. A symbol “⁂” in the mode line indicates that the julia-mode buffer is ready to interact with the julia-vterm REPL. Add the following line to your init file to enable =julia-vterm-mode= in =julia-mode= buffers automatically.

#+BEGIN_SRC emacs-lisp
(add-hook 'julia-mode-hook #'julia-vterm-mode)
#+END_SRC

By default, the command named =julia= in your =PATH= is used. You can use a Julia executable in any path by setting the =julia-vterm-repl-program= variable to its absolute path. The variable can contain switches for the =julia= command. For example, you can use a =julia= executable at a certain path, with 4 threads enabled, by the line like the following.

#+BEGIN_SRC emacs-lisp
(setq julia-vterm-repl-program "/path/to/julia -t 4")
#+END_SRC

** How to use

=M-x julia-vterm-repl= (or =M-x julia= if no other packages define it before julia-vterm is loaded) opens an inferior Julia REPL buffer.

In a julia script buffer with =julia-vterm-mode= on, you can open a Julia REPL with =M-x julia-vterm-switch-to-repl-buffer= (or =C-c C-z=). See below for other commands.

Both of the above operations open a REPL with the default session name =main=. You can specify a different session name by using the prefix argument =C-u=. A new session will be created and opened if there is no REPL with that session name.

You can also specify a session name by defining a file local variable =julia-vterm-session= (or =julia-session= if no other packages pre-define it). If the variable is defined, =C-c C-z= will open a REPL with that session name.

** Key bindings

*** julia-vterm-mode

#+begin_example
Key         Command / Description
------------------------------------------------------------------------------------------
C-c C-z     julia-vterm-switch-to-repl-buffer
            Switch to the paired REPL buffer or to the one with a specified session name.
            With prefix ARG, prompt for session name.

C-<return>  julia-vterm-send-region-or-current-line
            Send the content of the region if the region is active, or send the current
            line.

C-c C-b     julia-vterm-send-buffer
            Send the whole content of the script buffer to the Julia REPL line by line.

C-c C-i     julia-vterm-send-include-buffer-file
            Send a line to evaluate the buffer's file using include() to the Julia REPL.
            With prefix ARG, Revise.includet() is used instead.

C-c C-d     julia-vterm-send-cd-to-buffer-directory
            Send cd() function call to the Julia REPL to change the current working
            directory of REPL to the buffer's directory.
#+end_example

*** julia-vterm-repl-mode

#+begin_example
Key         Command / Description
------------------------------------------------------------------------------------------
C-c C-z     julia-vterm-repl-switch-to-script-buffer
            Switch to the script buffer that is paired with the current Julia REPL buffer.

M-k         julia-vterm-repl-clear-buffer
            Clear the content of the Julia REPL buffer.

C-c C-t     julia-vterm-repl-copy-mode
            Enter copy mode.
#+end_example

*** julia-vterm-repl-mode (copy mode)

#+begin_example
Key         Command / Description
------------------------------------------------------------------------------------------
C-c C-t     julia-vterm-repl-copy-mode
            Exit copy mode.

<return>    julia-vterm-repl-copy-mode-done
            Copy the region to the kill ring and exit copy mode.

C-c C-r     vterm-reset-cursor-point
            Call the vterm command that moves point to where it should be.
#+end_example