[jboss-jira] [JBoss JIRA] (WFCORE-1469) Support match-comparison operation for if-command

[Thomas Darimont (JIRA)]

Thomas Darimont created WFCORE-1469:
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             Summary: Support match-comparison operation for if-command
                 Key: WFCORE-1469
                 URL: https://issues.jboss.org/browse/WFCORE-1469
             Project: WildFly Core
          Issue Type: Feature Request
          Components: CLI
            Reporter: Thomas Darimont
            Assignee: Alexey Loubyansky
            Priority: Minor


Conditional expressions are great help for creating generic wildfly configurations with the CLI.
Currently the {{comparison-operations}} for the {{if-expression}} are limited to 
- equal (==)
- not equal (!=)
- lesser than (<)
- not lesser than (>=)
- greater than (>)
- not greater than (<=)

I'd propose an additional comparison operation: a regex based match operation with the symbol {{~=}}
wheras the left operand is a string to match against the right operand which is a regex string.

This would enable a simple way to do feature flag detection via partial regex matches.

The following sequence demonstrates this use case:

[code]
-Dfeatures="activemq jgroups"
[code]

[code]
if (features ~= ".*activemq.*") of /:resolve-expression(expression=${features})
echo configuring activemq
end-if

if (features ~= ".*jgroups.*") of /:resolve-expression(expression=${features})
echo configuring jgroups
end-if

if (features ~= ".*postgres.*") of /:resolve-expression(expression=${features})
echo configuring postgres
end-if
[code]

Example:
[code]
[default at local:9990 /] if (features ~= ".*feature1.*") of /:resolve-expression(expression=${features})
[default at local:9990 /] echo configuring feature1
[default at local:9990 /] end-if
configuring feature1

[default at local:9990 /] if (features ~= ".*feature2.*") of /:resolve-expression(expression=${features})
[default at local:9990 /] echo configuring feature2
[default at local:9990 /] end-if
configuring feature1

[default at local:9990 /] if (features ~= ".*feature3.*") of /:resolve-expression(expression=${features})
[default at local:9990 /] echo configuring feature3
[default at local:9990 /] end-if
[default at local:9990 /]
[code]



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