Initial data commit

Task/Visualize-a-tree/Tcl/visualize-a-tree-1.tcl

@@ -0,0 +1,26 @@
+package require struct::tree
+
+proc visualize_tree {tree {nameattr name}} {
+    set path {}
+    $tree walk [$tree rootname] -order both {mode node} {
+	if {$mode eq "enter"} {
+	    set s ""
+	    foreach p $path {
+		append s [expr {[$tree next $p] eq "" ? "  " : "\u2502 "}]
+	    }
+	    lappend path $node
+	    append s [expr {
+		[$tree next $node] eq "" ? "\u2514\u2500" : "\u251c\u2500"
+	    }]
+	    if {[$tree keyexists $node $nameattr]} {
+		set name [$tree get $node $nameattr]
+	    } else {
+		# No node name attribute; use the raw name
+		set name $node
+	    }
+	    puts "$s$name"
+	} else {
+	    set path [lrange $path 0 end-1]
+	}
+    }
+}

Task/Visualize-a-tree/Tcl/visualize-a-tree-2.tcl

@@ -0,0 +1,3 @@
+# Sample tree to demonstrate with
+struct::tree t deserialize {root {} {} a 0 {} d 3 {} e 3 {} f 9 {} b 0 {} c 0 {}}
+visualize_tree t