tacky-motif

A proof-of-concept XMPP client: libtacky behind a Motif window. It does what libtacky's reference client (libtacky/examples/tacky-tk) does, call for call: accounts, the chat list, a conversation, sending text. It also unlocks an encrypted store and answers an untrusted certificate.

Written for old toolchains: C89 (it builds clean under -std=c89 -pedantic -Wall -Wextra), Motif 1.2's API only, plain POSIX make.

Files

file	what
main.c	the window, the accounts, chats and conversation, the events
proto.c	the wire: request tokens and their callbacks, events
link.c	the way to the backend: tackyd-json or libtacky.a
json.c	a small JSON parser and argument builder
buf.c	a growable buffer

Two ways to the backend

• tacky-motif (default) runs tackyd-json as a child process and speaks its frames (<byte count>\n<json>) over pipes. It needs no threads, no C++ and no Tcl: just a C compiler and Motif. The daemon can come from another machine's build of libtacky.
• tacky-motif-lib links libtacky.a in process (embed/tacky.h). libtacky's emit callback runs on its own thread, so it queues frames and wakes the Xt loop through a pipe. It needs a C++ linker and pthreads.

Building

cd tacky-motif
make                                    # tacky-motif
make tacky-motif-lib LIBTACKY=../libtacky
make CC=gcc X_CFLAGS=-I/usr/X11R6/include X_LIBS="-L/usr/X11R6/lib -lXm -lXt -lX11"

tackyd-json and libtacky.a come from libtacky's own build, done in its container (make tackyd-json MEDIA_BACKEND=none there).

Running

./tacky-motif -tackyd ../libtacky/dist/tackyd-json            # a profile on disk
./tacky-motif -tackyd ../libtacky/dist/tackyd-json -transient # nothing written
TACKYD_JSON=/opt/tacky/tackyd-json ./tacky-motif -app-name work

The profile is libtacky's $XDG_CONFIG_HOME/libtacky/tacky-motif (-app-name changes the last part). The daemon's log goes to the terminal's stderr.

Text is UTF-8 and wants a UTF-8 locale (the client warns on stderr otherwise). The built-in font list is a font set over misc-fixed, the bitmap fonts of xfonts-base (Debian) or xorg-x11-fonts-misc (Fedora), so Cyrillic and the like draw as characters rather than as Latin-1 bytes.

Fonts and colours are X resources. On Motif 2.3 with Xft, for example:

TackyMotif*renderTable: rt
TackyMotif*rt*fontType: FONT_IS_XFT
TackyMotif*rt*fontName: DejaVu Sans
TackyMotif*rt*fontSize: 10

Not done

This is a POC. Not done: rooms, files, calls, OMEMO controls, paging older history, removing an account after <AuthError>, and sign-up.