yeet

node_modules/command-exists/lib/command-exists.js

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+'use strict';
+
+var exec = require('child_process').exec;
+var execSync = require('child_process').execSync;
+var fs = require('fs');
+var path = require('path');
+var access = fs.access;
+var accessSync = fs.accessSync;
+var constants = fs.constants || fs;
+
+var isUsingWindows = process.platform == 'win32'
+
+var fileNotExists = function(commandName, callback){
+    access(commandName, constants.F_OK,
+    function(err){
+        callback(!err);
+    });
+};
+
+var fileNotExistsSync = function(commandName){
+    try{
+        accessSync(commandName, constants.F_OK);
+        return false;
+    }catch(e){
+        return true;
+    }
+};
+
+var localExecutable = function(commandName, callback){
+    access(commandName, constants.F_OK | constants.X_OK,
+        function(err){
+        callback(null, !err);
+    });
+};
+
+var localExecutableSync = function(commandName){
+    try{
+        accessSync(commandName, constants.F_OK | constants.X_OK);
+        return true;
+    }catch(e){
+        return false;
+    }
+}
+
+var commandExistsUnix = function(commandName, cleanedCommandName, callback) {
+
+    fileNotExists(commandName, function(isFile){
+
+        if(!isFile){
+            var child = exec('command -v ' + cleanedCommandName +
+                  ' 2>/dev/null' +
+                  ' && { echo >&1 ' + cleanedCommandName + '; exit 0; }',
+                  function (error, stdout, stderr) {
+                      callback(null, !!stdout);
+                  });
+            return;
+        }
+
+        localExecutable(commandName, callback);
+    });
+
+}
+
+var commandExistsWindows = function(commandName, cleanedCommandName, callback) {
+  // Regex from Julio from: https://stackoverflow.com/questions/51494579/regex-windows-path-validator
+  if (!(/^(?!(?:.*\s|.*\.|\W+)$)(?:[a-zA-Z]:)?(?:(?:[^<>:"\|\?\*\n])+(?:\/\/|\/|\\\\|\\)?)+$/m.test(commandName))) {
+    callback(null, false);
+    return;
+  }
+  var child = exec('where ' + cleanedCommandName,
+    function (error) {
+      if (error !== null){
+        callback(null, false);
+      } else {
+        callback(null, true);
+      }
+    }
+  )
+}
+
+var commandExistsUnixSync = function(commandName, cleanedCommandName) {
+  if(fileNotExistsSync(commandName)){
+      try {
+        var stdout = execSync('command -v ' + cleanedCommandName +
+              ' 2>/dev/null' +
+              ' && { echo >&1 ' + cleanedCommandName + '; exit 0; }'
+              );
+        return !!stdout;
+      } catch (error) {
+        return false;
+      }
+  }
+  return localExecutableSync(commandName);
+}
+
+var commandExistsWindowsSync = function(commandName, cleanedCommandName, callback) {
+  // Regex from Julio from: https://stackoverflow.com/questions/51494579/regex-windows-path-validator
+  if (!(/^(?!(?:.*\s|.*\.|\W+)$)(?:[a-zA-Z]:)?(?:(?:[^<>:"\|\?\*\n])+(?:\/\/|\/|\\\\|\\)?)+$/m.test(commandName))) {
+    return false;
+  }
+  try {
+      var stdout = execSync('where ' + cleanedCommandName, {stdio: []});
+      return !!stdout;
+  } catch (error) {
+      return false;
+  }
+}
+
+var cleanInput = function(s) {
+  if (/[^A-Za-z0-9_\/:=-]/.test(s)) {
+    s = "'"+s.replace(/'/g,"'\\''")+"'";
+    s = s.replace(/^(?:'')+/g, '') // unduplicate single-quote at the beginning
+      .replace(/\\'''/g, "\\'" ); // remove non-escaped single-quote if there are enclosed between 2 escaped
+  }
+  return s;
+}
+
+if (isUsingWindows) {
+  cleanInput = function(s) {
+    var isPathName = /[\\]/.test(s);
+    if (isPathName) {
+      var dirname = '"' + path.dirname(s) + '"';
+      var basename = '"' + path.basename(s) + '"';
+      return dirname + ':' + basename;
+    }
+    return '"' + s + '"';
+  }
+}
+
+module.exports = function commandExists(commandName, callback) {
+  var cleanedCommandName = cleanInput(commandName);
+  if (!callback && typeof Promise !== 'undefined') {
+    return new Promise(function(resolve, reject){
+      commandExists(commandName, function(error, output) {
+        if (output) {
+          resolve(commandName);
+        } else {
+          reject(error);
+        }
+      });
+    });
+  }
+  if (isUsingWindows) {
+    commandExistsWindows(commandName, cleanedCommandName, callback);
+  } else {
+    commandExistsUnix(commandName, cleanedCommandName, callback);
+  }
+};
+
+module.exports.sync = function(commandName) {
+  var cleanedCommandName = cleanInput(commandName);
+  if (isUsingWindows) {
+    return commandExistsWindowsSync(commandName, cleanedCommandName);
+  } else {
+    return commandExistsUnixSync(commandName, cleanedCommandName);
+  }
+};