Generate Groovy API doc from command line
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$ groovydoc -classpath /usr/local/Cellar/groovy/3.0.1/libexec/lib/ \
-d output \
-windowtitle "Groovy Logging Example" \
-header "Groovy 1.8 Logging (Inspired by Actual Events)" \
-footer "Inspired by Actual Events: Logging in Groovy 1.8" \
-doctitle "Logging in Groovy 1.8 Demonstrated" \
*.groovy *.java