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The cabal-macrobot-download package is a library for building and running cabalized macros in Go. It has substantial overlap with the github.com/cabal/calls package, but goes further by providing built-in support for using external programs to generate, process, or analyze Haskell code. The goal of this project is to provide an easier way for people writing libraries in Haskell to use external tools without needing to do any extra work when creating their packages. You can find out more about the project on its GitHub page at https://github.com/mars0n21/cabalmacrobotdownload . All examples in the article were created with a "Hello, World!" program written in Haskell and then converted into a cabalized macro using cabal-macrobot-download. The package contains several executable files that are meant to be used together—each takes one or more command line arguments and passes these on to the next executable. The core idea of the project is that you should be able to run your script without needing to know about all of them or how they interact with one another, but there are some cases where it helps to understand what each step does. To help you do this, we will look at four separate examples: Multiline Haskell source code passed through "hsc2hs" from . hsc files from .hsc files The example code was written to interact with the stdin and stdout streams so it can be run from the command line without needing to pipe anything in or out. Note that in most cases, there is no reason for you to use cabal-macrobot-download yourself—it's intended for library maintainers. You can always just use calls or other similar packages to turn your sources into a cabal package, and then let the users of your package handle setup and installation themselves. This section describes how to use cabal-macrobot-download with a single .hs source file. You can generate a single target .hsc source using the "cabal" executable, and then pass it on to the "hsc2hs" executable: $ cabal new-build foo.hs Using main:Main ... A lot of output ... real build time 00:00:08.060004 Running HsColour >=0.9 && cfa1e77820
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