103 lines
2.7 KiB
Elixir
103 lines
2.7 KiB
Elixir
defmodule ToweropsWeb.ChangelogParser do
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@moduledoc """
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Reads and parses priv/static/changelog.txt into structured entries.
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Parses changelog entries with format:
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- "YYYY-MM-DD — Title" or "YYYY-MM-DD – Title" (with em/en dash)
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- "YYYY-MM-DD" (date only, no title)
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- "* Item text" (bullet items belonging to the most recent date)
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"""
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@doc "Returns a list of %{date: Date.t(), title: String.t() | nil, items: [String.t()]}"
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def parse do
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path = Application.app_dir(:towerops, "priv/static/changelog.txt")
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case File.read(path) do
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{:ok, content} ->
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content
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|> parse_content()
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|> Enum.map(&convert_entry/1)
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{:error, _} ->
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[]
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end
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end
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@doc """
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Parse changelog content string into a list of entries.
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Returns internal tuples: {:changelog_entry, date, title_opt, items}
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"""
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def parse_content(content) when is_binary(content) do
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content
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|> String.split("\n")
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|> Enum.reduce([], fn line, acc -> parse_line(line, acc) end)
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|> Enum.reverse()
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|> Enum.map(fn entry ->
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{:changelog_entry, entry.date, entry.title, Enum.reverse(entry.items)}
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end)
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end
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# Parse a single line and update the accumulator
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defp parse_line(line, acc) do
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# Check for date with title: "YYYY-MM-DD [—–] Title"
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case Regex.run(~r/^(\d{4}-\d{2}-\d{2})\s+(—|–)\s+(.+)/u, line) do
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[_, date_str, _dash, title] ->
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add_date_entry(acc, date_str, {:some, String.trim(title)})
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nil ->
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parse_line_no_title(line, acc)
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end
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end
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defp parse_line_no_title(line, acc) do
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cond do
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# Check for date only: "YYYY-MM-DD"
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Regex.match?(~r/^\d{4}-\d{2}-\d{2}\s*$/, line) ->
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add_date_entry(acc, line, :none)
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# Check for bullet item: "* Item text"
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String.starts_with?(String.trim(line), "* ") ->
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add_item_to_current_entry(acc, line)
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# Non-matching line - ignore
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true ->
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acc
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end
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end
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defp add_date_entry(acc, date_str, title) do
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[
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%{
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date: String.trim(date_str),
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title: title,
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items: []
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}
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| acc
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]
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end
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defp add_item_to_current_entry(acc, line) do
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trimmed = String.trim(line)
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item = String.slice(trimmed, 2..-1//1)
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case acc do
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[current | rest] ->
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[%{current | items: [item | current.items]} | rest]
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[] ->
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# Orphan item before any date header - ignore
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[]
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end
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end
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defp convert_entry({:changelog_entry, date_str, title_opt, items}) do
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%{
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date: Date.from_iso8601!(date_str),
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title: unwrap_option(title_opt),
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items: items
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}
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end
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defp unwrap_option({:some, value}), do: value
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defp unwrap_option(:none), do: nil
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end
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