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CONTRIBUTING.md

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Contributing to gomplate

Thanks for considering a contribution! All contributions are welcome, including bug reports, bug fixes, new features or even just questions.

Features

For PRs, please:

Bugs

Submit issues to issue tracker.

Any bug fix PRs must also include unit tests and/or integration tests to prevent regression.

If you think you've found a sensitive security issue, please e-mail me before opening an issue: [email protected]. My PGP key is available on Keybase: https://keybase.io/dhenderson/.

Versioning, API and Deprecation

I try to follow Semantic Versioning 2.0.0 as much as possible, and as such the version numbers attached to gomplate releases have semantic meaning. That is, patch-level releases (e.g. when going from 2.3.0 to 2.3.1) will only contain bug fixes and will not otherwise add or remove features, while minor-level releses (e.g. 2.3.0 to 2.4.0) will only contain new features and will not remove or make breaking changes to features, and major-level releases (e.g. 2.3.0 to 3.0.0) will contain breaking changes (either feature removals, renames, or significant behaviour changes).

When making a change that'll require either a minor or major version bump upon release, the PR should be labeled with the api/minor or api/major labels.

Note also that only the "Public API" is subject to the semver guarantees. Here's what I consider as "Public API":

  1. exported code
  • this includes the behaviour of that code as documented
  • excluding function definitions (in the funcs/ sub-directory)
  • excluding unit and integration tests
  1. template functions
  • the namespaced function names and aliases, as used inside templates (e.g. math.Add)
  • the Go functions that implement these functions may change:
    • the function signature may change in compatible ways (i.e. a parameter type widening from string to interface{})
  1. the gomplate command and its command-line arguments

Any semver guarantees only apply between released versions of gomplate. I reserve the right to make breaking changes to new features before these features are delivered in a release.

Sometimes, a deprecation is necessary. I will mark these deprecations in the documentation as soon as possible, and the deprecations may turn into removals (or renames, behaviour changes, etc...) as early as the next major version. However, features may stay deprecated for many major versions without being removed.

Style Guide

Code style is enforced by golangci-lint during CI builds.

Template Function Style

Gomplate's code base has grown organically, and so it's full of quirks and inconsistencies. However, there are a few style points that have emerged over the years:

  1. Generally, all template functions should take interface{} as an input type, and do type conversions where necessary. As an example, see https://github.com/hairyhenderson/gomplate/blob/af961ebe30041acb4e7f94ddd5f7c92372f97111/funcs/math.go#L96..L111
    • In cases where a function takes a slice as input, use interface{} as the input, and convert it to a []interface{} if needed
  2. Where defaults can be inferred, I prefer allowing a relaxed polymorphic style - see https://github.com/hairyhenderson/gomplate/blob/af961ebe30041acb4e7f94ddd5f7c92372f97111/funcs/crypto.go#L118..L133 as an example
    • tl;dr: I take ...interface{} as a single input type, and do type conversion and argument inference based on the number of arguments provided
    • this only works when certain args can be considered "optional"
  3. Pipelining (i.e. {{ "result of some action" | some.Function }}) is powerful and it's good to make sure that functions with multiple arguments specify them in a sane order for pipelining.
    • When you're unsure about argument order, prefer the order that will make pipelining easier: 
      {{ "one,two,three" | strings.Split "," }} <- this is far more natural
    • Don't depend too much on existing functions as a guide - there's already a lot of inconsistency there!