From 3c51c3be85bb0d1bdb87ea0d6632f1c256912f27 Mon Sep 17 00:00:00 2001 From: Dimitri Staessens Date: Sun, 6 Oct 2019 21:37:45 +0200 Subject: build: Add some required modules for node --- node_modules/cross-spawn/lib/util/readShebang.js | 37 ++++++++++++++++++++++++ 1 file changed, 37 insertions(+) create mode 100644 node_modules/cross-spawn/lib/util/readShebang.js (limited to 'node_modules/cross-spawn/lib/util/readShebang.js') diff --git a/node_modules/cross-spawn/lib/util/readShebang.js b/node_modules/cross-spawn/lib/util/readShebang.js new file mode 100644 index 0000000..2cf3541 --- /dev/null +++ b/node_modules/cross-spawn/lib/util/readShebang.js @@ -0,0 +1,37 @@ +'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; -- cgit v1.2.3