Source file `misc.ml`

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(*
 * Copyright (c) 2018 Thomas Gazagnaire <thomas@gazagnaire.org>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 *)

open Astring

let hpad_of_lines = function
  | [] -> 0
  | h :: _ ->
      let i = ref 0 in
      while !i < String.length h && h.[!i] = ' ' do
        incr i
      done;
      !i

let pp_pad ppf = function
  | 0 -> ()
  | i -> Fmt.string ppf (String.v ~len:i (fun _ -> ' '))

let pp_lines pp = Fmt.(list ~sep:(unit "\n") pp)

let dump_string ppf s = Fmt.pf ppf "%S" s

let read_file file =
  let ic = open_in_bin file in
  let len = in_channel_length ic in
  let file_contents = really_input_string ic len in
  close_in ic;
  file_contents

let init file =
  let file_contents = read_file file in
  let lexbuf = Lexing.from_string file_contents in
  lexbuf.lex_curr_p <-
    { pos_fname = file; pos_cnum = 0; pos_lnum = 1; pos_bol = 0 };
  (file_contents, lexbuf)

let pp_position ppf lexbuf =
  let p = Lexing.lexeme_start_p lexbuf in
  Fmt.pf ppf "File \"%s\", line %d, character %d" p.Lexing.pos_fname
    p.Lexing.pos_lnum
    (p.Lexing.pos_cnum - p.Lexing.pos_bol)

(* TODO: better error reporting *)
let err lexbuf fmt =
  Fmt.kstrf (fun str -> Fmt.failwith "%a: %s" pp_position lexbuf str) fmt