In this fork, I'm working to make Emacs support pure-gtk3, in order to support Wayland.

You need cairo.

git clone https://github.com/masm11/emacs.git
cd emacs
./autogen.sh
./configure --without-x --with-cairo --with-modules
make

Ignore warnings.

This repository contains PKGBUILD, so you can do to install:

mkdir /tmp/emacs
cd /tmp/emacs
wget https://raw.githubusercontent.com/masm11/emacs/pgtk/PKGBUILD
makepkg -s
sudo pacman -U emacs-pgtk*.tar.xz

cd src
GDK_BACKEND=wayland ./emacs  (or try ./emacs -Q if you have problems.)

Of course, PGTK supports X11 and Wayland connections.

You can use GDK_BACKEND environment variable and --display option, and you can do (make-frame-on-display display-name) with display-name of different backend from the first frame.

You can know which backend is used for a frame:

(pgtk-backend-display-class)

This returns "GdkWaylandDisplay" for Wayland, or "GdkX11Display" for X11.

Note: Segmentation fault may occur on multiple display environment.

X has the resource database, and you could store initial default values into it.

Gtk/Gdk can't handle it even if on X11, so I implemented similar feature using gsettings.

Saving:

(pgtk-set-resource "background" "gray")

Getting:

(x-get-resource "background" "Background")

If your emacs got failing to start, then edit your settings with dconf-editor. Your settings are saved under /org/gnu/emacs/defaults-by-name/<instance-name>/ and /org/gnu/emacs/defaults-by-class/. All are of string type. Correct your mistakes.

Known problems:

• Segmentation fault while multiple-display.
• Exits when a connection to display server is closed by peer. (I may not be able to resolve.)

Not implemented:

• GTK on wayland does not implement functions for these features:
  • x_set_offset
  • x_set_no_focus_on_map
  • x_set_no_accept_focus
  • x_set_z_group
  • auto-raise/lower
• GTK does not implement functions for these features:
  • vendor_specific_keysyms
• Some other features. Keywords:
  • popup_activated
  • gtk_plug (not exists on wayland)
  • x_set_parent_frame
  • frame_x_embedded_p

I may not develop them because I don't use them.

Edit src/pgtkterm.h to uncomment:

#define PGTK_DEBUG 1

It enables so much debugging outputs.

On gdb, you may want to do:

(gdb) handle SIGPIPE nostop noprint

By default, color fonts are ignored.

To use them, you can write this code in ~/.emacs:

(when (featurep 'pgtk)
  (setq xft-ignore-color-fonts nil))

Changing this variable on the fly may not work.

You need cairo 1.16.0.

• archlinux
• gtk+ 3.24.8
• glib2 2.60.4
• gnome-shell 3.32.2
• gcc 8.3.0
• wayland 1.17.0
• wayland-protocols 1.17
• cairo 1.16.0
• freetype2 2.10.0
• imagemagick 7.0.8.49

• This code is NOT completely pure.

  It uses backend-specific functions to obtain the socket file descriptor to the display server. It supports X11 and Wayland.

• Commit messages are in Japanese.

masm11.