Source file `batch.ml`

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(* YOCaml a static blog generator.
   Copyright (C) 2025 The Funkyworkers and The YOCaml's developers

   This program is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation, either version 3 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <https://www.gnu.org/licenses/>. *)

let iter = Action.batch_list
let fold = Action.fold_list
let iter_children = Action.batch
let fold_children = Action.fold
let iter_files = iter_children ~only:`Files
let iter_directories = iter_children ~only:`Directories
let fold_files ?where ~state = fold_children ~only:`Files ?where ~state

let fold_directories ?where ~state =
  fold_children ~only:`Directories ?where ~state

let fold_tree ?(where = fun _ _ -> true) ~state path action =
  let rec aux state path =
    fold_children ~only:`Both ~state path (fun path state cache ->
        let open Eff in
        let* is_file = is_file ~on:`Source path in
        if is_file && where `File path then action path state cache
        else
          let* is_dir = is_directory ~on:`Source path in
          if is_dir && where `Directory path then aux state path cache
          else return (cache, state))
  in
  aux state path

let iter_tree ?where path action cache =
  let open Eff in
  let+ cache, () =
    fold_tree ?where ~state:() path
      (fun path () cache ->
        let+ cache = action path cache in
        (cache, ()))
      cache
  in
  cache