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

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>