doomemacs/modules/feature/eval

:feature eval

• Table of Contents
• Install
• Usage
• Configuration
  • REPLs
  • Code Evaluation

This modules adds support for evaluating code from inside Emacs. This includes REPLs and direct access to the interpreters and compilers of many languages.

Table of Contents   TOC

• Install
• Usage

• Configuration

  • REPLs
  • Code Evaluation

Install

This module has no external dependencies. However, specific languages may require additional setup.

Check the README.org in that language's module for details.

Usage

• REPLs Invoked via:

  • :repl (evil ex-command)
  • <leader> o r in normal mode (or visual mode, which sends the selection to the open REPL)
  • M-x +eval/open-repl
  • M-x +eval/send-region-to-repl while a selection (and REPL) is active

• Code Evaluation Quickrun can be invoked via:

  • M-x +eval/buffer (or gR, or M-r)
  • M-x +eval/region
  • M-x +eval/region-and-replace
  • Evil users can use the gr operator to select and run a region.

Configuration

REPLs

REPLs are defined for most of the languages Doom supports (check its README.org to see if it does).

Otherwise, you can define your own for a specified major-mode with the :repl setting.

(set! :repl MAJOR-MODE FUNCTION)

FUNCTION must return the repl buffer. Any window changes are ignored, then handed off to shackle (assuming shackle-mode is on) to display in a popup window.

(defun +emacs-lisp/repl ()
  (interactive)
  (pop-to-buffer
   (or (get-buffer "*ielm*")
       (progn (ielm)
              (let ((buf (get-buffer "*ielm*")))
                (bury-buffer buf)
                buf)))))

(set! :repl 'emacs-lisp-mode #'+emacs-lisp/repl)

Code Evaluation

Run regions or entire buffers with Quickrun. Output will be sent to a popup window.

Quickrun includes support for many languages, but occasionally, you'll find a language without support, such as Crystal. A "runner" can be defined like so:

(set! :eval 'crystal-mode
      '((:command     . "crystal")
        (:exec        . "%c %s")
        (:description . "Run Crystal script")))

A simpler version is simply to use the path to the binary:

(set! :eval 'groovy-mode "groovy")

Or if you'd rather run an elisp command:

(set! :eval 'emacs-lisp-mode #'+emacs-lisp-eval)