| Subject: | Allow lazy variable expansion |
AppConfig performs expansion immediatly when parsing a file, meaning variable definition order matters.
a = $b
b = 1
=> won't work
Morevoer, in multiple configuration file scenarios, it doesn't allow easy variable redefinition, as any subsequent including variable as to be redefined also
a = 1
b = $a
a = 2
=> b still equals 1
The following patch add a new value EXPAND_LAZY to expansion policy, that allows variable to get expanded at retrieval time, instead of insertion time. It does this by moving _expand method from File to State, renaming it to _substitue to avoid name clash (additional benefit: should allow variable expansion from elsewhere as file, such as command line options), and adding it an additional context parameter.
Additional tests are also included in the patch.
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