Major If a Aesh command could return some form of Object Result instead of just a simple int status we could allow for some more advanced pipe options between Commands.
public interface Formatter<T> { void format(T, Output) } public interface Result<T, Formatter<T>> {}
When the user pipe two commands together, Aesh could now try to match the Output with the Input of the next Command.
Let's say we have the following:
public class ListDependenciesCommand { Result<Set<MavenDependency>>, Formatter<Set<MavenDependency>> execute(CommandInvocation) { .. do pom magic, return Set<MavenDependency> } } public class GrepCommand { @OptionList private List<Object> pipeInput; @Option private String arguments; Result<Set<Object>>, Formatter<Set<Object>> execute(CommandInvocation) { .. grep based on el expression passed in by arguments on each Object in pipeinput and return Set<Object> } }
Now you could do Object value grepping, not only 'what was printed' grepping.
list-dependencies pom.xml | grep "$groupId == 'org.arquillian'" | sort "$version" | add-dependencies --target ../some-other/pom.xml
If the command is not executed in 'pipe mode', the Results Formatter would simply be called instead.
