Emacs supporting pure-gtk3

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

Building

You need cairo.

git clone https://github.com/masm11/emacs.git
cd emacs
./autogen.sh
./configure --with-pgtk --with-cairo --with-modules
make

Ignore warnings.

For archlinux users

This repository contains PKGBUILD, so you can install by:

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

Running

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

X11 and Wayland

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.

Instead of xrdb

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.

TODO

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_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:
- gtk_plug (not exists on wayland)
- frame_x_embedded_p

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

Debugging

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

Input Methods

(when (eq window-system 'pgtk)
  (pgtk-use-im-context t))

This enables Gtk's GtkIMContext.

However, when you type e.g. C-x o, C-x goes through input methods and is handled by Emacs, and o is handled by input methods, so お appears as a preedit text. I have no idea. You can turn off input method before typing C-x o. I do, so no problem.

My Environment

archlinux
gtk+ 3.24.20
glib2 2.64.3
gcc 10.1.0
wayland 1.18.0
wayland-protocols 1.20
cairo 1.17.2
freetype2 2.10.2
imagemagick 7.0.10.22
ibus 1.5.22
mozc 2.23.2815.102
wayfire e4f8d2bf

Notice

We (@masm11 and @fejfighter) are going to push @fejfighter's fork to the fsf's repository, instead of my fork. @fejfighter's one is rebaseable and have English commit messages. See #23.

About me

masm11.

jeffwk/emacs