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| 1 | +#r "nuget: Markdig, 0.38.0" |
| 2 | + |
| 3 | +open System |
| 4 | +open Markdig |
| 5 | +open System.IO |
| 6 | +open Markdig.Renderers.Roundtrip |
| 7 | +open Markdig.Syntax |
| 8 | + |
| 9 | +let readmeFilePath = Path.Combine(__SOURCE_DIRECTORY__, "README.md") |
| 10 | + |
| 11 | +let markdown = File.ReadAllText(readmeFilePath) |
| 12 | +let document = Markdown.Parse(markdown, trackTrivia = true) |
| 13 | + |
| 14 | +let headers = |
| 15 | + document.Descendants<HeadingBlock>() |
| 16 | + |> Seq.skip 2 // The document header and the Table of Contents |
| 17 | + |
| 18 | +let getLink(header: string) = |
| 19 | + let characters = |
| 20 | + header |
| 21 | + |> Seq.choose(function |
| 22 | + | c when Char.IsLetterOrDigit c -> Some(Char.ToLowerInvariant c) |
| 23 | + | ' ' -> Some '-' |
| 24 | + | _ -> None |
| 25 | + ) |
| 26 | + |> Seq.toArray |
| 27 | + |
| 28 | + "#" + String characters |
| 29 | + |
| 30 | +let tocText = |
| 31 | + "- [Awesome F#](#)\n" + ( |
| 32 | + headers |
| 33 | + |> Seq.map(fun h -> |
| 34 | + let text = h.Inline.FirstChild.ToString() |
| 35 | + let indent = String(' ', (h.Level - 1) * 2) |
| 36 | + $"{indent}- [{text}]({getLink text})" |
| 37 | + ) |
| 38 | + |> String.concat "\n" |
| 39 | + ) + "\n\n" |
| 40 | + |
| 41 | +let updateHeader (header: HeadingBlock) (newContent: string) = |
| 42 | + let parent = header.Parent |
| 43 | + let index = parent.IndexOf header |
| 44 | + while not (parent[index + 1] :? HeadingBlock) do |
| 45 | + parent.RemoveAt(index + 1) |
| 46 | + |
| 47 | + let newMd = Markdown.Parse(newContent, trackTrivia = true) |
| 48 | + for block in newMd do |
| 49 | + block.Parent.Remove block |> ignore |
| 50 | + parent.Insert(index + 1, block) |
| 51 | + |
| 52 | +let firstHeader = |
| 53 | + document.Descendants<HeadingBlock>() |
| 54 | + |> Seq.find (fun h -> h.Level = 2) |
| 55 | + |
| 56 | +updateHeader firstHeader tocText |
| 57 | + |
| 58 | +File.WriteAllText(readmeFilePath, |
| 59 | + use sw = new StringWriter() |
| 60 | + let renderer = RoundtripRenderer sw |
| 61 | + renderer.Write document |
| 62 | + sw.ToString() |
| 63 | +) |
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