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import Std.Data.HashMap
import Lean.Data.Json.Parser

def ofHex a b := let f (x : Char) := x.toNat - (if x.toNat ≤ '9'.toNat then '0'.toNat else 'a'.toNat - 10)
  16 * (f a) + (f b) |> Char.ofNat

def main := do
  let keysym := (← IO.FS.readFile "keysymdef.h").splitOn "\n" |>.map (fun l : String ↦ (ofHex (String.Pos.Raw.get! l ⟨45⟩) (String.Pos.Raw.get! l ⟨46⟩), Substring.mk l ⟨11⟩ ⟨30⟩ |>.takeWhile (· ≠ ' ') |>.toString)) |> Std.HashMap.ofList
  IO.println "# Generated by https://git.unnamed.website/miscelleaneous/tree/Compose.lean"
  IO.println "include \"%L\""
  let raw_abbrs ← IO.Process.run { cmd := "curl", args := #["https://raw.githubusercontent.com/vasnesterov/vscode-lean4/refs/heads/master/lean4-unicode-input/src/abbreviations.json"] }
  match Lean.Json.parse raw_abbrs with
  | .ok (.obj abbrs) =>
    for abbr in abbrs do
      match abbr.2 with
      | .str s =>
        if s.contains '$' then
          pure ()
        else
          -- XCompose doesn't like sequences to be prefixes of other sequences, so append enter to the end
          IO.println s!"<Multi_key> <{abbr.1.toList.map (keysym.get! ·) |> "> <".intercalate}> <Return> : \"{s.replace "\\" "\\\\"}\""
      | _ => pure ()
  | _ => IO.println "parse failure"