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/*Copyright 2021 Eric Selin
This file is part of `bob`.
`bob` is free software: you can redistribute it and/or modifyit under the terms of the GNU Lesser General Public License as published bythe Free Software Foundation, either version 3 of the License, or(at your option) any later version.
`bob` is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty ofMERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See theGNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public Licensealong with `bob`. If not, see <https://www.gnu.org/licenses/>.
Please contact the developers via GitHub <https://www.github.com/ericselin>or email eric.selin@gmail.com <mailto:eric.selin@gmail.com>*/
import type {  BuildOptions,  DirtyChecker,  LocationGenerator,  FileWalkerCreator,} from "../domain.ts";import { walk } from "../deps.ts";import getWalkEntryProcessor from "./walk-entry-processor.ts";
async function* walkFiles(  options: BuildOptions,  path: string,): LocationGenerator {  const processWalkEntry = getWalkEntryProcessor(options);  for await (const walkEntry of walk(path)) {    if (walkEntry.isFile) yield processWalkEntry(walkEntry);  }}
async function* yieldDirtyFilePaths(walk: LocationGenerator) {  for await (const location of walk) {    if (location.dirty) yield location;  }}
const createDirtyFileWalker: FileWalkerCreator = (dirtyCheckerCreators) =>  (options) => {    const dirtyCheckers = dirtyCheckerCreators.map((dirtyChekerCreator) =>      dirtyChekerCreator(options)    );    async function* markDirty(walk: LocationGenerator, isDirty?: DirtyChecker) {      for await (const location of walk) {        if (location.dirty) {          yield location;          continue;        } else if (isDirty && await isDirty(location)) {          location.dirty = true;          options.log?.debug(`Marking ${location.inputPath} dirty`);        }        yield location;      }    }    return () => {      const dirtyCheckedWalker = dirtyCheckers.reduce(        (walk, isDirty) => markDirty(walk, isDirty),        markDirty(walkFiles(options, options.contentDir)),      );      return yieldDirtyFilePaths(dirtyCheckedWalker);    };  };
export default createDirtyFileWalker;