94 lines
2.2 KiB
Markdown
94 lines
2.2 KiB
Markdown
# FeedReader
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FeedReader fetches and parses RSS, Atom, and RDF feeds into normalized Elixir
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data. It detects formats automatically, recovers from common defects in
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real-world XML, and is tested against real feeds. Bounded results and lazy event
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streams make it suitable for production workloads.
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Add FeedReader to your Mix project's dependencies:
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```elixir
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defp deps do
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[
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{:feed_reader, "~> 0.1.0"}
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]
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end
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```
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Then fetch dependencies and start an interactive Elixir session:
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```sh
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mix deps.get
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iex -S mix
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```
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Try parsing a feed in IEx:
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```elixir
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xml = """
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<rss version="2.0">
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<channel>
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<title>Example</title>
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<item><title>First item</title><guid>one</guid></item>
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</channel>
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</rss>
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"""
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{:ok, result} = FeedReader.parse_binary(xml, max_items: 100)
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result.feed.title
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#=> "Example"
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Enum.map(result.items, & &1.title)
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#=> ["First item"]
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```
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## Fetch a remote feed
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Use `fetch_and_parse/2` to download and collect a feed. Set `:max_items` to a
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positive limit to bound the number of retained items.
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```elixir
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{:ok, result} =
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FeedReader.fetch_and_parse("https://example.com/feed.xml", max_items: 1_000)
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result.feed
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result.items
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```
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## Stream feed events
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For large feeds, `stream/2` returns feed metadata and items as a lazy event
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stream. Fully consuming the stream cleans up its downloaded temporary file. If
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enumeration may stop early, close the session in an `after` block:
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```elixir
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{:ok, session} = FeedReader.stream("https://example.com/feed.xml")
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try do
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session.events
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|> Enum.take(10)
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|> Enum.each(&IO.inspect/1)
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after
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FeedReader.close(session)
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end
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```
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Local feeds can be streamed with `stream_file/2`; the source file remains owned
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by the caller. See the `FeedReader` module documentation for parsing options,
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verified parsing, and format customization.
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## How to contribute
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Install [Elixir](https://elixir-lang.org/install.html) 1.20.4 with Erlang/OTP
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29.1.2, as specified in `.tool-versions`. Then fetch dependencies and run the
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project checks:
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```sh
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mix deps.get
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mix precommit
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mix credo --strict
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```
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Create a branch for your change and submit it as a pull request. `mix precommit`
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compiles with warnings treated as errors, checks formatting, and runs the tests.
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