[CMcC] 2008Sep1 was looking for a way to read configuration into dicts and such.

I wanted something like [subst] to perform variable and functional substitution, but which guaranteed the resultant form would be list-like, if the input was.  I also wanted the ability to intersperse comments in the configuration structure.  What I really wanted was a tcl-like little-language for configuration.

The following proc ignores lines which are commented like tcl source, and substitutes [[]] and $-forms.
Its output is a list of fully substituted tcl-like words.  It may be nested.

'''Caveat''': The little language isn't completely coherent and consistent, in that the characters '';'' and ''#'' always have special literal significance as commencing comments.  I'm prepared to tolerate that inflexibility in exchange for speed and ease of parsing, but it may not suit you.

    proc rc {text} {
	set accum ""
	set result {}
	foreach line [split $text \n] {
	    set line [string trim $line]
	    if {$line eq ""} continue
	    lassign [split $line {\#;}] line
	    append accum " " [string trim $line]
	    if {$accum ne "" && [info complete $accum]} {
		set pass [uplevel 1 list $accum]
		lappend result {*}$pass
		set accum ""
	    }
	}
	return $result
    }

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