Changelog

The format is based on Keep a Changelog, and this project adheres to Semantic Versioning.

v1.1.0

Adds support for Dotenvy.Parser.parse/3 options :sys_cmd_fn and :sys_cmd_opts to allow for greater control over how (or if) any system commands (designated via $()) are executed during parsing.
Updates dependencies to latest
Docs cleanup around RELEASE_ROOT so the examples tolerate cases where the path includes or omits a trailing slash. This is important because a bad path there causes all kinds of frustration in a release.

Removes fallback to System.fetch_env/1 and instead requires explicit sourcing of system envs. See Issue 21
Bumps Elixir version specified for local development in .tool-versions
Updates dependencies to latest

Enables exception rescuing to report on problems with custom callback functions
Moves Dotenvy.Transformer.Error to Dotenvy.Error to offer a simpler interface for devs who want to raise errors from custom transformer functions
Improved documentation and examples for usage in umbrella apps
Updates all internal options in the parser to use %Opts{} struct
Improves test coverage
Bumps Elixir version specified for local development in .tool-versions
Updates dependencies to latest

Formally defines a type for all supported conversions to improve documentation and specs
Updates dependencies to latest
Specifies Elixir 1.13 as required (simply because I can't get anything older to compile)

Does away with the confusing :overwrite? and vars options in favor of a simple declarative/explicit inputs. source/2 now accepts ad-hoc maps as inputs.
Updates dependencies including :ex_doc to take advantage of admonishment blocks.
Various documentation cleanups/clarifications.

Shifts storage of system environment variables to the application process dictionary and alters the reading of this data to help improve the security posture and avoid leaking env values. :side_effect option for source/2 and source!/2 function changed.

Makes error messages more informative when unable to convert strings to integers or floats

Adds support for custom transformer types by allowing an arity 1 function as the second argument to Dotenvy.Transformer.to/2. See Issue 2

Renames Dotenvy.Transformer.to/2 to Dotenvy.Transformer.to!/2 to better communicate that it may raise an error.
Returns key name in errors for easier troubleshooting.
Tracks an error if the :require_files option lists a file not included in the files input (for sanity).
Introduces Dotenvy.env!/3 (which is the same as Dotenvy.env/3 but with no defaults provided). This better communicates that it may raise an error (because internally it relies on Dotenvy.Transformer.to!/2)
Deprecates Dotenvy.env/3 in favor of Dotenvy.env!/3

Adds support for default type of :string to the Dotenvy.env!/2 and Dotenvy.env/3 functions.

Initial release.