Commits on Nov 9, 2016

1. Add new ini parser; merges commonly named sections--allows #INCLUDE t… …

   …o be more effective
   
   This patch adds a ini-merging ability whereby tag=value items are merged
   together into the same effective section.  Consider the following ini file:
   ----begin----
   [A]
   var0 = 0
   
   [B]
   var0 = 12
   
   [A]
   var0 = 123
   var1 = hi
   ---end----
   
   With the old parser, only the first instance of the 'A' section would be
   recognized.  The second instance of the 'A' section would be entirely
   ignored.  With this new parser, the final 'A' section contains two values
   for var0 and one value for var1.
   
   The major benefit of this patch is that the #INCLUDE command can be used
   much more effectively.  As an example, one could define a configuration
   file that is fairly generic and _almost_ fits perfectly for a whole series
   of machines.  Then, in order to specialize the configuration for a
   particular machine, one can simply set the specialized tag=value items
   first in the specialized ini-file; following these specialized tag=value
   items, one simply uses #INCLUDE to import the generic configuration, were
   the specialized tag=value items are first taken from the specialized ini
   file.
   
   One additional feature is added with this patch:
   If one uses the ":=" operator, instead of the simple "=" operator, one can
   override all previous values for that particular [SECTION]VARIABLE.  In
   other words, before using a ":=" operator, the above example yields two
   separate values for [A]var0.  If a subsequent assignment to [A]var0 looked
   like:
   -----beg-snip----
   [A]
   var0 := 1010
   -----end-snip----
   then the previous values for [A]var0 would be discarded and only this last
   value remains.
   
   Note:  The new ':=' override operator is implemented both in the c++ _and_
   tcl code.
   
   Signed-off-by: Spencer E Olson <[email protected]>

   

   olsonse committed Nov 9, 2016
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