# A little RSS Browser
 #  based on Richard Suchenwirth's XML Browser
 package require http
 package require BWidget
 package require tdom
 
 proc recurseInsert {w node parent} {
    set name [$node nodeName]
    if {$name=="#text" || $name=="cdata"} {
        set text [$node nodeValue]
        set fill black
        set icon file
    } else {
        set text <$name
        foreach att [$node attributes] {
            catch {append text " $att=\"[$node getAttribute $att]\""}
        }
        append text >
        set fill blue
        set icon folder
    }
    $w insert end $parent $node -text $text -fill $fill -image [Bitmap::get $icon] -helptext $::name
    foreach child [$node childNodes] {recurseInsert $w $child $node}
 }
 
 Tree .t -yscrollcommand ".y set"
 scrollbar .y -ori vert -command ".t yview"
 pack .y  -side right -fill y
 pack .t -side right -fill both -expand 1

 #package require autoproxy  ;# add if needed for proxy support
 #autoproxy::init            
 proc fetch {url} {
    set res [http::data [set tok [http::geturl $url]]]
    http::cleanup $tok
    return $res
 }
 
 # add more if desired
 set site {https://wiki.tcl-lang.org/rss.xml
           http://rss.slashdot.org/Slashdot/slashdot
           http://rss.news.yahoo.com/rss/topstories}
 
 foreach name $site {
        set xml [fetch $name]
        dom parse  $xml doc
        $doc documentElement root
        recurseInsert .t $root root
 }

$ /tmp/rss.tk    
node "domNode141870" already exists
    while executing
"Tree::insert .t end root domNode141870 -text {<rss version="2.0">} -fill blue -image image1 -helptext http://rss.news.yahoo.com/rss/topstories"
    ("eval" body line 1)
    invoked from within
"eval [linsert $args 0 Tree::$cmd .t]"
    (procedure ".t" line 1)
    invoked from within
"$w insert end $parent $node -text $text -fill $fill -image [Bitmap::get $icon] -helptext $::name"
    (procedure "recurseInsert" line 16)
    invoked from within
"recurseInsert .t $root root"
    ("foreach" body line 6)
    invoked from within
"foreach name $site {
        puts "name = $name"
        set xml [fetch $name]
        dom parse  $xml doc
        $doc documentElement root
        recurseInsert .t $root root
 }"
    (file "/tmp/rss.tk" line 46)