VT100/xterm-support for syscons(4) committed to SVN
ed at 80386.nl
Thu Jan 1 13:33:42 UTC 2009
I've just committed libteken (the VT100/xterm-compatible terminal
emulator I've been working on) to the FreeBSD SVN source tree. See the
commit message below.
Even though I had some people test the code, there's always a chance I
did something wrong. Let me know if you discover any rendering issues.
Ed Schouten <ed at 80386.nl>
----- Forwarded message from Ed Schouten <ed at FreeBSD.org> -----
> Date: Thu, 1 Jan 2009 13:26:53 +0000 (UTC)
> From: Ed Schouten <ed at FreeBSD.org>
> To: src-committers at freebsd.org, svn-src-all at freebsd.org,
> svn-src-head at freebsd.org
> Subject: svn commit: r186681 - in head/sys: conf dev/syscons
> dev/syscons/teken pc98/cbus
> Author: ed
> Date: Thu Jan 1 13:26:53 2009
> New Revision: 186681
> URL: http://svn.freebsd.org/changeset/base/186681
> Replace syscons terminal renderer by a new renderer that uses libteken.
> Some time ago I started working on a library called libteken, which is
> terminal emulator. It does not buffer any screen contents, but only
> keeps terminal state, such as cursor position, attributes, etc. It
> should implement all escape sequences that are implemented by the
> cons25 terminal emulator, but also a fair amount of sequences that are
> present in VT100 and xterm.
> A lot of random notes, which could be of interest to users/developers:
> - Even though I'm leaving the terminal type set to `cons25', users can
> do experiments with placing `xterm-color' in /etc/ttys. Because we
> only implement a subset of features of xterm, this may cause
> artifacts. We should consider extending libteken, because in my
> opinion xterm is the way to go. Some missing features:
> - Keypad application mode (DECKPAM)
> - Character sets (SCS)
> - libteken is filled with a fair amount of assertions, but unfortunately
> we cannot go into the debugger anymore if we fail them. I've done
> development of this library almost entirely in userspace. In
> sys/dev/syscons/teken there are two applications that can be helpful
> when debugging the code:
> - teken_demo: a terminal emulator that can be started from a regular
> xterm that emulates a terminal using libteken. This application can
> be very useful to debug any rendering issues.
> - teken_stress: a stress testing application that emulates random
> terminal output. libteken has literally survived multiple terabytes
> of random input.
> - libteken also includes support for UTF-8, but unfortunately our input
> layer and font renderer don't support this. If users want to
> experiment with UTF-8 support, they can enable `TEKEN_UTF8' in
> teken.h. If you recompile your kernel or the teken_demo application,
> you can hold some nice experiments.
> - I've left PC98 the way it is right now. The PC98 platform has a custom
> syscons renderer, which supports some form of localised input. Maybe
> we should port PC98 to libteken by the time syscons supports UTF-8?
> - I've removed the `dumb' terminal emulator. It has been broken for
> years. It hasn't survived the `struct proc' -> `struct thread'
> - To prevent confusion among people that want to hack on libteken:
> unlike syscons, the state machines that parse the escape sequences are
> machine generated. This means that if you want to add new escape
> sequences, you have to add an entry to the `sequences' file. This will
> cause new entries to be added to `teken_state.h'.
> - Any rendering artifacts that didn't occur prior to this commit are by
> accident. They should be reported to me, so I can fix them.
> Discussed on: current@, hackers@
> Discussed with: philip (at 25C3)
----- End forwarded message -----
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