Add vterm layer

vterm layer uses emacs-libvterm for terminal support

modules/emacs/vterm/autoload.el

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+;;; emacs/vterm/autoload.el -*- lexical-binding: t; -*-
+
+;;;###autoload
+(defun +vterm/open (arg)
+  "Open a terminal buffer in the current window. If ARG (universal argument) is
+non-nil, cd into the current project's root."
+  (interactive "P")
+  (let ((default-directory
+          (if arg
+              (or (doom-project-root) default-directory)
+            default-directory)))
+    (switch-to-buffer (save-window-excursion (vterm)))))
+
+;;;###autoload
+(defun +vterm/open-popup (arg)
+  "Open a terminal popup window. If ARG (universal argument) is
+non-nil, cd into the current project's root."
+  (interactive "P")
+  (let ((default-directory
+          (if arg
+              (or (doom-project-root) default-directory)
+            default-directory)))
+    (pop-to-buffer (save-window-excursion (vterm)))))
+
+;;;###autoload
+(defun +vterm/open-popup-in-project ()
+  "Open a terminal popup window in the root of the current project."
+  (interactive)
+  (+vterm/open-popup t))

modules/emacs/vterm/config.el

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+;;; emacs/vterm/config.el -*- lexical-binding: t; -*-
+
+(def-package! vterm
+  :load-path (lambda () (list (concat doom-packages-dir "/quelpa/build/vterm")))
+  :init
+  (unless (file-executable-p (concat
+                              (file-name-directory (locate-library "vterm"))
+                              "vterm-module.so"))
+    ;; let vterm compile `vterm-modules.so'
+    (setq-default vterm-install t))
+  :when (and (string-match-p "MODULES" system-configuration-features)
+             (display-graphic-p))
+  :config
+  (set-env! "SHELL")
+  (add-hook 'vterm-mode-hook #'doom|mark-buffer-as-real)
+  ;; Automatically kill buffer when vterm exits.
+  (setq-default vterm-exit-functions #'kill-buffer)
+  (when (featurep! :feature evil)
+    (evil-set-initial-state 'vterm-mode 'insert)
+    ;; Those keys are commonly needed by terminals.
+    (evil-define-key 'insert vterm-mode-map
+      (kbd "C-d") #'vterm--self-insert)
+    ;; Go back to normal state but don't move cursor backwards.
+    ;; Moving cursor backwards is the default Vim behavior but
+    ;; it is not appropriate in some cases like terminals.
+    (add-hook 'vterm-mode-hook #'(lambda ()
+                                   (setq-local evil-move-cursor-back nil)))))

modules/emacs/vterm/doctor.el

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+;;; emacs/vterm/doctor.el -*- lexical-binding: t; -*-
+
+(unless (executable-find "vterm-ctrl")
+  (warn! "Couldn't find libvterm library. Please install it on your system"))
+
+(unless (executable-find "make")
+  (warn! "Couldn't find make command. Please install it on your system"))
+
+(unless (executable-find "cmake")
+  (warn! "Couldn't find cmake command. Please install it on your system"))
+
+(unless (string-match-p "MODULES" system-configuration-features)
+  (error! "You have to compile emacs with MODULES support"))

modules/emacs/vterm/packages.el

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+;; -*- no-byte-compile: t; -*-
+;;; emacs/vterm/packages.el
+
+(package! vterm :recipe (:fetcher github :repo "akermu/emacs-libvterm"))

modules/emacs/vterm/readme.org

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+#+TITLE:   emacs/vterm
+#+DATE:    January 16, 2019
+#+SINCE:   {replace with next tagged release version}
+#+STARTUP: inlineimages
+
+* Table of Contents :TOC_3:noexport:
+- [[Description][Description]]
+- [[Prerequisites][Prerequisites]]
+  - [[Emacs requirement][Emacs requirement]]
+  - [[Compiler requirement][Compiler requirement]]
+  - [[System requirement][System requirement]]
+
+* Description
+An [[https://github.com/akermu/emacs-libvterm][emacs-libvterm]] module.
+
+* Prerequisites
+
+** Emacs requirement
+
+You have to compile emacs with =--with-modules= option.
+
+Lookat the =system-configuration-options= variable to see if your emacs has this option.
+
+** Compiler requirement
+
+Your system need to have =make= =cmake= and a c compiler to compile
+=libvterm-module=, Emacs will automatically compile the module for you.
+
+You can also put your pre-compiled =vterm-module.so= to your vterm installation
+folder, which is usually =~/.emacs.d/.local/packages/quelpa/build/vterm/=,
+and make sure =vterm-module.so= file is executable, instead of let emacs compile
+it for you.
+
+** System requirement
+
+You need to have =libvterm= installed in your system.
+
+On Ubuntu or Debian:
+
+#+BEGIN_SRC sh
+sudo apt install libvterm-dev
+#+END_SRC
+
+On ArchLinux or Manjaro:
+
+#+BEGIN_SRC sh
+sudo pacman -S libvterm
+#+END_SRC
+
+On macOS:
+
+#+BEGIN_SRC sh
+brew install libvterm
+#+END_SRC
+