18 lines
527 B
OCaml
18 lines
527 B
OCaml
type t = { lines : string array; cursor : int }
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(** Invariant: cursor >= 0 cursor < Array.length lines *)
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let size s = Array.length s.lines
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let cursor s = s.cursor
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let create (fname : string) : t =
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let lines =
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In_channel.with_open_text fname In_channel.input_lines |> Array.of_list
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in
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{ lines; cursor = 0 }
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let show_line s : string = s.lines.(s.cursor)
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let next s =
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if s.cursor < size s - 1 then { s with cursor = s.cursor + 1 } else s
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let prev s = if s.cursor > 0 then { s with cursor = s.cursor - 1 } else s
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