This week's Tcl-URL

QOTW: "Writing to the same file via two open handles is a good way to
shoot yourself in the foot." -- Ralf Fassel

"... keeping things in Tcl means the code is maintainable by more folks.
(There are so many more pitfalls in C than there are in Tcl.)"
-- Dossy Shiobara


POTW: VirtualList 0.9 by ulis.  A listbox megawidget that can display
     more items than will fit in memory, up to 2^30-1.
     http://perso.wanadoo.fr/maurice.ulis/tcl/Virtuallist/


     Tcl's introspection facilities are top-notch, but there seems to be
     a bug with execution traces:
         http://groups.google.com/groups?th=4771053ef2d616e5

     I was inundated this weekend by the W32/Swen.A@MM worm:
     over 300 messages at home, 200 at work, and still going strong!
         http://groups.google.com/groups?th=a51d6290b50cbffd
         http://www.symantec.com/avcenter/venc/data/w32.swen.a@mm.html

     A wide-ranging discussion of performance issues related to file I/O
     and buffering, with statistics on different chunk sizes:
         http://groups.google.com/groups?th=7f3a3e6ccf7fe9d5

     ...and performance of the "foreach [var1 ... varN] $list break" idiom:
         http://groups.google.com/groups?th=13fef8ec74ec071a

     An interesting technique for binding to multiple keypresses:
         http://groups.google.com/groups?th=6c666b118ce5e317

     Upvar, arrays, and textvariables, oh my!
         http://groups.google.com/groups?th=76d510fdbbfab704


Thanks to Arjen Markus for his summary of recent Wiki activity:
  Oh dear, I wish I had all the time in the world to read:
  - The articles about Tcl, <http://wiki.tcl.tk/1016> has been updated
  
  - The description of how to arrange toplevel widgets in a hierarchy
    <http://wiki.tcl.tk/9986> is just the first of a series
  
  - All those pages on introspection facilities within Tcl and Tk,
    <http://wiki.tcl.tk/9922> provides a starting point
  
  Why not add:
  - Predicates: to be or not to be (but have), <http://wiki.tcl.tk/1000>
  
  - Two object systems, simple or complex, <http://wiki.tcl.tk/6196> and
    <http://wiki.tcl.tk/1297>
  
  Now the other pages to which I would to direct your attention are less
  encompassing:
  - Two packages for manipulating MIDI (yes, music from your computer),
    <http://wiki.tcl.tk/9985>
  
  - Any one who wants to write his/her own window manager (at least 
    under X Window)? <http://wiki.tcl.tk/9937> provides a lever
  
  - A curious psychological fact about the way our brain recognises 
    words, <http://wiki.tcl.tk/9923> shows that you can shuffle letters
    around and still keep the text readable
  
  - And as a dessert, a page showing set operations with a minor flaw,
    <http://wiki.tcl.tk/359>


Everything Tcl-related you want is probably one or two clicks away in these
pages:
    The "Welcome to comp.lang.tcl" message by Andreas Kupries
        http://www.purl.org/net/tcl-welcome

    The Tcl Developer Site is Tcl's "home base".
	http://www.tcl.tk

    Larry Virden maintains a comp.lang.tcl FAQ launcher
        http://www.purl.org/NET/Tcl-FAQ/

    The Tcl Developer Xchange is a highly organized resource center
    of documents and software with provisions for individuals to
    maintain references to their own software:
        http://www.tcl.tk/resource/
    The TDX sponsor, ActiveState, also keeps info to convince your
    boss Tcl is a good thing
        http://www.tcl.tk/scripting/

    The Tcl'ers Wiki is a huge, dynamic, collaboratively edited repository
    of documentation, examples, tutorials and pontifications on all things 
    Tcl.
        http://wiki.tcl.tk/0
    For the ideal overview of the topics about Tcl most likely to
    interest a newcomer, see "Arts and Crafts ..."
        http://wiki.tcl.tk/969

    ActiveState maintains binaries distribution and development tools
        http://www.activestate.com/Tcl
    along with a Cookbook of Tcl recipes
        http://aspn.activestate.com/ASPN/Cookbook/Tcl

    Cameron Laird tracks several Tcl/Tk references of interest
        http://phaseit.net/claird/comp.lang.tcl/

    Cetus Links maintains a Tcl/Tk page with verified links
        http://www.cetus-links.org/oo_tcl_tk.html

    Google Groups archives comp.lang.tcl.announce posts
        http://groups.yahoo.com/group/tcl_announce/

Previous - (U)se the (R)esource, (L)uke! - messages are listed here:
  http://www.ddj.com/topics/tclurl/
An alternative is
  http://groups.google.com/groups?oi=3Ddjq&as_q=3D+Tcl-URL!&as_ugroup=3Dcom=
p.lang.tcl

Suggestions/corrections for next week's posting are always welcome.

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