NAME

       observe - Runtime debugging output in TkCon

SYNOPSIS

       observe command cmdname ?maxlevel?

       observe cdelete cmdname

       observe cinfo cmdname

       observe variable varname operation ?args?

       observe vdelete varname operation

       observe vinfo varname

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DESCRIPTION

       This  command  provides runtime debugging output for variables and commands without the need to edit your
       code.  For variables, the underlying mechanism uses trace and dump var.  For  commands,  it  renames  the
       observed  procedure  and  uses  a  special  wrapper  procedure.   WARNING:  using  this  procedure  after
       checkpointing state will result in major problems if you clean state because the renamed (true)  commands
       will be lost.

       This procedure is experimental.  Comments are encouraged.

       observe command cmdname ?maxlevel?
              This  will  create  a wrapper command which prints out (using dump) the call stack to the console.
              maxlevel represents the maximum number of levels of the call stack which will be printed (defaults
              to 4).

       observe cdelete cmdname
              Removes the wrapper around an observed command.

       observe cinfo cmdname
              Prints out useless info.

       observe variable varname operation ?args?
              Currently  a  wrapper  around  trace  that  uses dump to print out the value of the named variable
              whenever the specified operation on that variable occurs (must be read, write or unset).

       observe vdelete varname operation
              Deletes the trace wrapper around the named variable.

       observe vinfo varname
              Prints out trace info about the named variable.

SEE ALSO

       dump(3tk), idebug(3tk), tkcon(1), tkcon(3tk), tkconrc(5)

KEYWORDS

       Tk, console, debug

COPYRIGHT

       Copyright (c) Jeffrey Hobbs <jeff at hobbs.org>