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//lib/node_modules/npm/node_modules/cross-spawn/lib/util/readShebang.js
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'use strict'; var fs = require('fs'); var LRU = require('lru-cache'); var shebangCommand = require('shebang-command'); var shebangCache = new LRU({ max: 50, maxAge: 30 * 1000 }); // Cache just for 30sec function readShebang(command) { var buffer; var fd; var shebang; // Check if it is in the cache first if (shebangCache.has(command)) { return shebangCache.get(command); } // Read the first 150 bytes from the file buffer = new Buffer(150); try { fd = fs.openSync(command, 'r'); fs.readSync(fd, buffer, 0, 150, 0); fs.closeSync(fd); } catch (e) { /* empty */ } // Attempt to extract shebang (null is returned if not a shebang) shebang = shebangCommand(buffer.toString()); // Store the shebang in the cache shebangCache.set(command, shebang); return shebang; } module.exports = readShebang;
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