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https://issues.apache.org/jira/browse/FREEMARKER-161?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17261940#comment-17261940
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Siegfried Goeschl commented on FREEMARKER-161:
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I also played around if it would be possible to something along of separate 
argument groups, e.g. "seed-template" and "seed-datasource" but the common 
parameter options causes a Picocli exception.

> [freemarker-generator] Allow multiple transformations on the CLI
> ----------------------------------------------------------------
>
>                 Key: FREEMARKER-161
>                 URL: https://issues.apache.org/jira/browse/FREEMARKER-161
>             Project: Apache Freemarker
>          Issue Type: Task
>            Reporter: Siegfried Goeschl
>            Assignee: Siegfried Goeschl
>            Priority: Major
>
> Currently freemarker-cli allows to transform
> * a single template using 0-n data source => file/stdout
> * multiple templates using 0-n shared data sources => files/stdout
> * a directory of templates using 0-n shared data sources => directory/stdout
> {noformat}
> # Transforming a directory of data source with a single template
> freemarker-generator -t 
> examples/templates/properties/csv/locker-test-users.ftl 
> examples/data/properties 
> # Transforming a directory of templates using data sources
> freemarker-generator -t examples/data/template -m 
> examples/data/ftl/nginx/nginx.env -o target/template
> # Transforming multiple templates using 0-n shared data sources & data models
> freemarker-generator \
> -t templates/freemarker-generator/csv/md/transform.ftl -o target/contract.md \
> -t templates/freemarker-generator/csv/html/transform.ftl -o 
> target/contract.html \
> examples/data/csv/contract.csv
> {noformat}
> It would be nice to support the transformation of multiple templates using 
> individual set of data sources, e.g.
> {noformat}
> freemarker-generator \
>  -t templates/freemarker-generator/csv/md/transform.ftl -s 
> examples/data/csv/contract.csv -o target/contract.md \
>  -t templates/freemarker-generator/csv/html/transform.ftl -s 
> examples/data/csv/sales-records.csv -o target/sales-records.html
> {noformat}



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