Herding Cats CDNLive 2013
9
I also threw this little tidbit into the body of the proc:
# This makes it easier to debug by globalizing some internal variables
if {$_debug} {
global internal_var
}
I often use this construct in my procs. Basically, I globalize a lot of my internal variables if
debug mode is set. This makes it easier to see what happened after the proc has run.
Note that I can just refer to the variable $_debug without any setup or anything. I defined a
boolean "-debug" in &define_proc_attributes, so &parse_proc_arguments created a variable
$_debug for me. I specified the default value as "1", so unless the invocation had "-nodebug",
the $_debug variabl will have the value "1".
The rest of the proc just prints the values:
puts "-verbose : \"$_verbose\""
puts "-debug : \"$_debug\""
if {[info exists _float_option]} {puts "-float_option : \"$_float_option\""}
if {[info exists _string_option]} {puts "-string_option :
\"$_string_option\""}
puts "-float_required : \"$_float_required\""
puts "-list_required : \"$_list_required\""
puts "-list_opt_with_default : \"$_list_opt_with_default\""
puts "_string_arg : \"$_string_arg\""
Note that for booleans and required arguments, and for optional arguments with defaults ("-
list_opt_with_default), it can just print the argument. As explained above, the variable will exist
once &parse_proc_arguments has run. For optional arguments without defaults, it checks first to
make sure the variable exists. It will only exist if that option was invoked.
There is an option to &define_proc_attributes (-default_string_to_null) that will cause unused
vars to get set, but this is deprecated because it can be difficult within the body of the proc to
know whether an option variable was set to null by the invocation of the command or by the
defaulting code. Leaving it unset is more useful.
So, lets take a look at &proc_template in action.
First, we'll invoke it with no options:
rc:/> &proc_template
Error : A required argument was not specified. [TUI-202] [parse_options]
: The flag '-float_required' was not specified.
: Rerun the command specifying all required arguments.
Usage: &proc_template [-verbose] [-debug] [-nodebug] [-float_option <float>]
[-string_option <string>]
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