Variable substitution and other goodies in trac.ini

[alvaro.iradier@…]

It would be useful to include some variable substitutions when processing trac.ini.

Example ONE

[trac]
authz_module_name = ${PROJECT_NAME}

would translate ${PROJECT_NAME} into the short project name (the folder name).

¿What situation would this be useful in?
Considering in some setups, where using a parent environments folder, and a parent subversion repository folder, where each trac env uses a different subversion repo (usually with the same name), this authz_module_name option would be included in the global trac.ini and inherited by all projects.

Example TWO

Inherit the value defined in the global trac.ini, like:

[trac]
repository_dir = ${INHERIT}/transporte

So, the global trac.ini could define the base parent repository_dir, and each project the subdirectory. If the parent SVN folder is moved or renamed, only changing the global trac.ini is necessary.

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Please add more examples and situations where this could be useful.

[ebray]

I like the syntax buildout uses for this: ${section:option}. Would definitely be useful to me.

[osimons]

The need has been raised at various times, and I'm going to close this as a duplicate of #7573 and make a note on that ticket about these suggestions.