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import os from 'os';

import {firstImplementer} from './helpers';

import AsyncQueue from './async-queue';

import GitShellOutStrategy from './git-shell-out-strategy';

export default {

create(workingDir, options = {}) {

return this.withStrategies([GitShellOutStrategy])(workingDir, options);

},

withStrategies(strategies) {

return function createForStrategies(workingDir, options = {}) {

const parallelism = options.parallelism || Math.max(3, os.cpus().length);

const commandQueue = new AsyncQueue({parallelism});

const strategyOptions = {...options, queue: commandQueue};

const strategyInstances = strategies.map(Strategy => new Strategy(workingDir, strategyOptions));

return firstImplementer(...strategyInstances);

};

},

};