fail2fail - Software

Screen-like tmux: Attach a tmux session from multiple clients and view different windows per client

nospam@example.com (Juri Hamburg) — Wed, 01 Feb 2012 10:39:02 +0100

If using terminal multiplexer screen, one can easily attach a session which is not detached with

screen -x

That way it is possible to attach the same session to multiple clients. By default you are able to view different screen windows per client which attached that session.

In tmux the default behavior differs. Though you can also attach the same tmux session to multiple clients e.g. with

tmux attach-session

it will let you view the same tmux window in all clients that attached that tmux session. When tmux instance starts it creates automatically one tmux session. Such a session is presented equally to every client.

Create independend tmux sessions for the same window set

A user creates a new tmux session with

user@clientA$ tmux new-session
## create some more windows
## work

The user decides to work with the same window set in another terminal independend:

user@clientB$ tmux list-sessions
0: 8 windows (created Tue Dec 13 20:55:56 2011) [136x49] (group 0) (attached)

user@clientB$ tmux new-session -t 0

That creates a new session which uses the same window set as group 0 listed above and attaches clientB to it. Two independent sessions working on the same set of windows are running. Very close to screen behavior.

Output of tmux list-sessions looks now like:

0: 8 windows (created Tue Dec 13 20:55:56 2011) [136x49] (group 0) (attached)
1: 8 windows (created Wed Dec 14 21:53:44 2011) [101x33] (group 0) (attached)

While attached to a tmux session tmux lets you change your session interactively with <C-b s>. Closing sessions is done e.g. by

tmux kill-session -t <sessionnumber>

Reduce the size of PDF documents

nospam@example.com (Juri Hamburg) — Mon, 12 Dec 2011 10:26:28 +0100

Use case: You are using (La)Tex to create your document and include some big non-vector graphics or high-quality scanned documents via \includepdf{} from pdfpages package. You could resize/size-optimize your included parts one by one to make your resulting PDF document smaller. Or you could compile your document and then use a trick to reduce the size of the final compiled document as PDF at once:

pdf2ps finaldoc.pdf finaldoc.ps && ps2pdf finaldoc.ps finaldoc_reduced.pdf

That way I managed to reduce the document size from 22MB to 4MB. Of course, the effect depends on the material included in your document. Give it a shot.

Update (2012/01/20):

If the hint above is still not enough you might want to try to reduce the final size with gs via PDFSETTINGS option described in the Ghostscript Documentation:

-dPDFSETTINGS=configuration
Presets the "distiller parameters" to one of four predefined settings:
/screen selects low-resolution output similar to the Acrobat Distiller
"Screen Optimized" setting.
/ebook selects medium-resolution output similar to the Acrobat Distiller
"eBook" setting.
/printer selects output similar to the Acrobat Distiller
"Print Optimized" setting.
/prepress selects output similar to Acrobat Distiller
"Prepress Optimized" setting.
/default selects output intended to be useful across a wide variety of
uses, possibly at the expense of a larger output file.

You can apply the desired parameter using ps2pdf:

ps2pdf -dPDFSETTINGS=/screen finaldoc.ps finaldoc_reduced.pdf

or gs:

gs -q -dBATCH -dNOPAUSE -sDEVICE=pdfwrite \
-dPDFSETTING=/screen -sOutputFile=finaldoc_reduced.pdf finaledoc.ps

Since it will lower the quality of the document it is advisable to check whether the document will still meet the requirements for the usage intended.

Case insensitive token matching in Notion/Ion3

nospam@example.com (Juri Hamburg) — Fri, 20 Jan 2012 12:58:34 +0100

To enable case insensitive token matching in Notion's menus like "Attach Window" (META-A) and "Go to Window" (META-G) add this line to any "dopathed" file in the notion configuration:

mod_query.set{ caseicompl = true }

That will save some time while navigating or layouting your workspaces.

Notion with case insensitive Goto-Query

Eclipse (EE) crashes

nospam@example.com (Juri Hamburg) — Sat, 12 Nov 2011 17:55:35 +0100

Some months ago Eclipse EE (Indigo) started to crash whenever Java EE view was active and I selected the menu entry "Window->Web Browser". Somewhere in the WWW I've found a solution by adding following lines into eclipse.ini:

-Dorg.eclipse.swt.browser.XULRunnerPath=/usr/lib/xulrunner-2.0/
-Dorg.eclipse.swt.browser.UseWebKitGTK=true

Posting it here for the logs. Today I got the problem on another machine and had to login into the machine where I already altered eclipse.ini to see which lines were relevant. Now it's here, just in case it happens to me somewhere else again.

Restructured Text nach Mediawiki Markup konvertieren

nospam@example.com (Juri Hamburg) — Tue, 21 Sep 2010 18:11:22 +0200

Vor einigen Tagen wollte ich größere Menge von restructured text Dokumenten (reST) nach Mediawiki Markup konvertieren. Eine Recherche ergab, dass es noch gar keine Werkzuege gibt, die das so machen, wie ich es haben wollte. Für sehr einfache reST Dokumente könnte sich Pandoc eignen. In vielen Fällen bei meinen Dokumenten, hatte es keine ordentliche Ausgabe hingekriegt.

Basierend auf Wikir (reST zu GoogleCodeWiki) und docutils habe ich einen Python-Skript geschrieben, der die Konvertierung so macht, wie ich es haben möchte. Bei Bedarf kann der Skript nicht nur reST nach Mediawiki Markup überführen, sondern auch das Dokument in eine minimale XML-Struktur "verpacken", so dass die Ergebnisse über die Import-Spezialseite importiert werden können. Der Code wird keinen Schönheits-Award gewinnen, seinen Zweck erfüllt er aber bei mir und, hoffentlich, kann es jemandem auf eine Weise behilflich sein.

Der Skript steht auf Github zur Verfügung.

Kurz der Stand der Dinge:

reST nach GoogleWiki kennt:

title
code block
strong + emphased text
bullet + enumeration lists
paragraph
references

reST nach Mediawiki kennt:

title
code block
inline literals
strong + emphased text
image
bullet + enumeration lists
definition lists
paragraph
comment
keine interne Links (todo)

minimale XML-Struktur für Mediawiki-Import

Möglicherweise werde ich in der nächsten Zeit etwas verbessern, oder sogar, wenn ich Zeit finde, Mediawiki-Support im Wikir ordnungsgemäß einpflegen.

Anwendungsbeispiel

user@host $   cd /path/to/directory_with_rest_documents
user@host $   mkdir ../docs.mediawiki
user@host $   for i in *; do echo "processing '$i'"; /path/to/rest2wiki.py \
           -w mediawiki \
           -f "$i" > ../docs.mediawiki/"$i".mediawiki; done

Aufruf von rest2wiki.py -h listet weitere mögliche Argumente auf.

Vorschläge und Patches sind sehr willkommen.

Scrollgeschwindigkeit im Vimperator

nospam@example.com (Juri Hamburg) — Mon, 11 Apr 2011 19:49:51 +0200

Damit man im Vimperator gefühlt noch schneller browsen kann, die Scrollweite hochsetzen mit dem Eintrag in .vimperatorrc:

nnoremap j 7j
nnoremap k 7k