23 lines
549 B
JavaScript
23 lines
549 B
JavaScript
|
'use strict';
|
||
|
|
|
||
|
|
const fs = require('fs');
|
||
|
|
const shebangCommand = require('shebang-command');
|
||
|
|
|
||
|
|
function readShebang(command) {
|
||
|
|
// Read the first 150 bytes from the file
|
||
|
|
const size = 150;
|
||
|
|
const buffer = Buffer.alloc(size);
|
||
|
|
|
||
|
|
let fd;
|
||
|
|
|
||
|
|
try {
|
||
|
|
fd = fs.openSync(command, 'r');
|
||
|
|
fs.readSync(fd, buffer, 0, size, 0);
|
||
|
|
fs.closeSync(fd);
|
||
|
|
} catch (e) { /* Empty */ }
|
||
|
|
|
||
|
|
// Attempt to extract shebang (null is returned if not a shebang)
|
||
|
|
return shebangCommand(buffer.toString());
|
||
|
|
}
|
||
|
|
|
||
|
|
module.exports = readShebang;
|