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!config
# Arara, the cool TeX automation tool
# Copyright (c) 2018, Paulo Roberto Massa Cereda 
# All rights reserved.
#
# This rule is part of arara.
identifier: velocity
name: Velocity
authors:
- Paulo Cereda
commands:
- name: The Velocity engine
  command: >
    @{
        mergeVelocityTemplate(isEmpty(input, reference, toFile(input)),
                              toFile(output), context);
        return true;
    }
arguments:
- identifier: context
  flag: >
    @{
        if (isMap(parameters.context)) {
            return parameters.context;
        }
        else {
            throwError('I was expecting a context map.');
        }
    }
  required: true
- identifier: output
  flag: >
    @{
        return parameters.output;
    }
  required: true
- identifier: input
  flag: >
    @{
        return parameters.input;
    }