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'use strict';

const path = require('path');
const which = require('which');
const pathKey = require('path-key')();

function resolveCommandAttempt(parsed, withoutPathExt) {
    const cwd = process.cwd();
    const hasCustomCwd = parsed.options.cwd != null;

    // If a custom `cwd` was specified, we need to change the process cwd
    // because `which` will do stat calls but does not support a custom cwd
    if (hasCustomCwd) {
        try {
            process.chdir(parsed.options.cwd);
        } catch (err) {
            /* Empty */
        }
    }

    let resolved;

    try {
        resolved = which.sync(parsed.command, {
            path: (parsed.options.env || process.env)[pathKey],
            pathExt: withoutPathExt ? path.delimiter : undefined,
        });
    } catch (e) {
        /* Empty */
    } finally {
        process.chdir(cwd);
    }

    // If we successfully resolved, ensure that an absolute path is returned
    // Note that when a custom `cwd` was used, we need to resolve to an absolute path based on it
    if (resolved) {
        resolved = path.resolve(hasCustomCwd ? parsed.options.cwd : '', resolved);
    }

    return resolved;
}

function resolveCommand(parsed) {
    return resolveCommandAttempt(parsed) || resolveCommandAttempt(parsed, true);
}

module.exports = resolveCommand;