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A little tool to write GitHub actions in Elixir
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lib/git_hub_actions/yaml.ex
defmodule GitHubActions.Yaml do
@moduledoc false
@spec encode(any()) :: String.t()
def encode(data) do
data
|> do_encode([], 0)
|> Enum.reverse()
|> Enum.join("\n")
|> newline()
end
defp do_encode(data, lines, _depth) when is_binary(data) do
string = if num_or_version?(data), do: "'#{data}'", else: data
[string | lines]
end
defp do_encode(data, lines, _depth) when is_number(data) do
[to_string(data) | lines]
end
defp do_encode(data, lines, depth) when is_map(data) do
data
|> Enum.into([])
|> do_encode(lines, depth)
end
defp do_encode([{key, item} | data], lines, depth) when is_binary(item) do
item = if num_or_version?(item), do: "'#{item}'", else: item
case multiline?(item) do
true ->
add = indent_heredoc(key, item, depth)
do_encode(data, add ++ lines, depth)
false ->
add = indent_key(key, item, depth)
do_encode(data, [add | lines], depth)
end
end
defp do_encode([{key, {:quoted, item}} | data], lines, depth) do
case multiline?(item) do
true ->
add = indent_multiline(key, item, depth)
do_encode(data, add ++ lines, depth)
false ->
add = indent_key(key, item, depth)
do_encode(data, [add | lines], depth)
end
end
defp do_encode([{key, item} | data], lines, depth) when is_number(item) do
add = indent_key(key, item, depth)
do_encode(data, [add | lines], depth)
end
defp do_encode([{key, item} | data], lines, depth) do
add = indent_key(key, depth)
sub = do_encode(item, [], depth + 1)
do_encode(data, Enum.concat([sub, [add], lines]), depth)
end
defp do_encode([item | data], lines, depth) do
{items, [last]} = item |> do_encode([], 0) |> Enum.split(-1)
items = indent(items, depth + 1) ++ [indent_item(last, depth)]
do_encode(data, items ++ lines, depth)
end
defp do_encode([], lines, _depth), do: lines
defp indent(depth), do: String.duplicate(" ", depth * 2)
defp indent(lines, depth) when is_list(lines) do
Enum.map(lines, fn line -> "#{indent(depth)}#{line}" end)
end
defp indent_item(item, depth), do: "#{indent(depth)}- #{item}"
defp indent_key(key, depth), do: "#{indent(depth)}#{key}:"
defp indent_key(key, item, depth), do: "#{indent_key(key, depth)} #{item}"
defp indent_heredoc(string, depth) do
string
|> String.trim_trailing()
|> String.split("\n")
|> indent(depth)
|> Enum.reverse()
end
defp indent_heredoc(key, string, depth) do
lines = indent_heredoc(string, depth + 1)
line = "#{indent_key(key, depth)} |"
lines ++ [line]
end
defp indent_multiline(string, depth) do
[line | lines] =
string
|> String.trim_trailing()
|> String.split("\n")
lines = lines |> indent(depth) |> Enum.reverse()
{line, lines}
end
defp indent_multiline(key, string, depth) do
{line, lines} = indent_multiline(string, depth + 1)
line = "#{indent_key(key, depth)} #{line}"
lines ++ [line]
end
defp multiline?(string), do: String.contains?(string, "\n")
defp newline(string), do: "#{string}\n"
defp num_or_version?(string) do
string
|> String.split(".")
|> Enum.all?(fn part -> part =~ ~r/^\d+$/ end)
end
end