Use Guava to convert string formats

guava.groovy

@Grab( 'com.google.guava:guava:13.0.1' )
import static com.google.common.base.CaseFormat.*

String.metaClass.caseFormat = { from, to ->
  from.to( to, delegate )
}

assert 'varName'.caseFormat( LOWER_CAMEL, UPPER_UNDERSCORE )       == 'VAR_NAME'
assert 'var-name'.caseFormat( LOWER_HYPHEN, UPPER_CAMEL )          == 'VarName'
assert 'var_name'.caseFormat( LOWER_UNDERSCORE, LOWER_CAMEL )      == 'varName'
assert 'VAR_NAME'.caseFormat( UPPER_UNDERSCORE, LOWER_UNDERSCORE ) == 'var_name'
assert 'VarName'.caseFormat( UPPER_CAMEL, LOWER_HYPHEN )           == 'var-name'

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