[GitHub] andrzej-kaczmarek opened a new pull request #201: Allow setting value to reference other setting

[GitBox <gi...@apache.org>]

andrzej-kaczmarek opened a new pull request #201: Allow setting value to reference other setting
URL: https://github.com/apache/mynewt-newt/pull/201
 
 
   Currently the only way to have one setting copy value from other setting is to do as follows:
   ```
   syscfg.vals:
       FOO: 'MYNEWT_VAL_BAR'
   ```
   The problem with the above is that `newt` handles value of `FOO` as a string which is then resolved by preprocessor during build so this won't evaluate properly if used inside `syscfg.restrictions`
   
   This PR allows one setting value to explicitly reference other setting and have other value copied by `newt`. The syntax is very simple:
   ```
   syscfg.vals:
       FOO: '@BAR'
   ````
   
   For now it does not support recursive references and there's no nice way to escape `@` if an actual value should start with `@` (perhaps prepending  `@` with space would work as a workaround...) but I think we can live with it until I can figure out how to do this in Go ;-)

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