Skippy McSkipface - A general Clojure dependency tracker.
Lisp systems are especially suited to the development of systems which must or can run indefinitely and where all changes are 'continuously delivered' as a series of patches.
If you feel annoyed by your Clojure systems slow start up time, you might just being 'doing it all wrong'. You should keep reading.
Skip allows us to avoid waste by eliminating unnecessary work that a system might otherwise perform in order to bring itself up-to-date.
You can use skip to create dependency graphs, mixing together files, templates, build artefacts, config, namespaces, components and other resources.
Dependency resolvers are supplied for common cases.
A dependency has a status: fresh, if it is up-to-date, or stale otherwise.
A dependant depends on the status of its dependencies.
A dependant can be a dependency of other dependants.
Each dependant can report its status.
A dependant is stale if any of its dependencies are stale.
Dependants can be refreshed, which usually involves doing work.
A dependant that is already fresh doesn’t need to be freshened. Work is avoided (skipped).
The act of freshening a dependant might cause that dependant to change, so it is returned as a value.
Each dependant can explain what it would do were it to be asked to freshen itself.
The dependency tree can be derefed at any point in time to become a value. In this way, it begins to take on similarities with Om’s app-state.
All nodes in the tree can be watched by watchers.
Changes to resources (e.g. files) that are otherwise outside the management of the system can be detected and notifications can be used to actively sync the app-state with these resources.
The MIT License (MIT)
Copyright © 2016 JUXT LTD.
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
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