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lib/changex/subject_splitter.ex
defmodule Changex.SubjectSplitter do
@moduledoc """
This module is used to split the subject of a commit message based on
a format passed in.
"""
@doc """
Split the `subject` based on the `format`.
## Examples
iex> subject = "fix(user): ensure email is required"
iex> format = "%{type}(%{scope}): %{description}"
iex> Changex.SubjectSplitter.get_parts(subject, format)
[type: "fix", scope: "user", description: "ensure email is required"]
"""
def get_parts(subject, format) do
Regex.split(~r/(?<head>)%{[^}]+}(?<tail>)/, format, trim: true, on: [:head, :tail])
|> parse_parts(subject)
end
defp parse_parts(parts, message) do
parse_part(parts, message)
end
defp parse_part([part | []], message) do
if matches = Regex.run(~r/%\{(.+)\}/, part) do
[_, part_name] = matches
add_part(part_name, message)
end
end
defp parse_part([part, next | parts], message) do
rest = [next | parts]
if matches = Regex.run(~r/%\{(.+)\}/, part) do
[_, part_name] = matches
{key, new_message} = String.split(message, next, parts: 2) |> rest_of_message
[{String.to_atom(part_name), key} | parse_part(rest, new_message)]
else
parse_part(rest, message)
end
end
defp add_part(part_name, ""), do: [{String.to_atom(part_name), nil}]
defp add_part(part_name, message), do: [{String.to_atom(part_name), message}]
defp rest_of_message([key, message]) do
{key, message}
end
defp rest_of_message(_) do
{nil, ""}
end
end