diff --git a/.eslintrc b/.eslintrc
new file mode 100644
index 0000000..120cb42
--- /dev/null
+++ b/.eslintrc
@@ -0,0 +1,8 @@
+{
+  "extends": "../../../_common/eslintrc.json",
+  "env": {"node": true},
+  "rules": {
+    "no-underscore-dangle": [2, {"allow": ["_DBG_useExt", "_DBG_checkOptions", "_DBG_checkMethod", "_readlineSync", "_execFileSync", "_handle", "_flattenArray", "_getPhContent", "_DBG_set_useExt", "_DBG_set_checkOptions", "_DBG_set_checkMethod", "_DBG_clearHistory", "_questionNum", "_keyInYN", "_setOption"]}],
+    "camelcase": 0
+  }
+}
diff --git a/.gitignore b/.gitignore
index b785247..5c6e52a 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,4 @@
+.vscode
 node_modules
 npm-debug.log
 tmp
diff --git a/lib/readline-sync.js b/lib/readline-sync.js
index 2d49ca6..7da0f1f 100644
--- a/lib/readline-sync.js
+++ b/lib/readline-sync.js
@@ -21,6 +21,7 @@ var
   pathUtil = require('path'),
 
   defaultOptions = {
+    /* eslint-disable key-spacing */
     prompt:             '> ',
     hideEchoBack:       false,
     mask:               '*',
@@ -38,6 +39,7 @@ var
     cd:                 false,
     phContent:          void 0,
     preCheck:           void 0
+    /* eslint-enable key-spacing */
   },
 
   fdR = 'none', fdW, ttyR, isRawMode = false,
@@ -45,6 +47,188 @@ var
   lastInput = '', inputHistory = [],
   _DBG_useExt = false, _DBG_checkOptions = false, _DBG_checkMethod = false;
 
+function getHostArgs(options) {
+  // Send any text to crazy Windows shell safely.
+  function encodeArg(arg) {
+    return arg.replace(/[^\w\u0080-\uFFFF]/g, function(chr) {
+      return '#' + chr.charCodeAt(0) + ';';
+    });
+  }
+
+  return extHostArgs.concat((function(conf) {
+    var args = [];
+    Object.keys(conf).forEach(function(optionName) {
+      if (conf[optionName] === 'boolean') {
+        if (options[optionName]) { args.push('--' + optionName); }
+      } else if (conf[optionName] === 'string') {
+        if (options[optionName]) {
+          args.push('--' + optionName, encodeArg(options[optionName]));
+        }
+      }
+    });
+    return args;
+  })({
+    /* eslint-disable key-spacing */
+    display:        'string',
+    displayOnly:    'boolean',
+    keyIn:          'boolean',
+    hideEchoBack:   'boolean',
+    mask:           'string',
+    limit:          'string',
+    caseSensitive:  'boolean'
+    /* eslint-enable key-spacing */
+  }));
+}
+
+// piping via files (for Node v0.10-)
+function _execFileSync(options, execOptions) {
+
+  function getTempfile(name) {
+    var filepath, suffix = '', fd;
+    tempdir = tempdir || require('os').tmpdir();
+
+    while (true) {
+      filepath = pathUtil.join(tempdir, name + suffix);
+      try {
+        fd = fs.openSync(filepath, 'wx');
+      } catch (e) {
+        if (e.code === 'EEXIST') {
+          suffix++;
+          continue;
+        } else {
+          throw e;
+        }
+      }
+      fs.closeSync(fd);
+      break;
+    }
+    return filepath;
+  }
+
+  var hostArgs, shellPath, shellArgs, res = {}, exitCode, extMessage,
+    pathStdout = getTempfile('readline-sync.stdout'),
+    pathStderr = getTempfile('readline-sync.stderr'),
+    pathExit = getTempfile('readline-sync.exit'),
+    pathDone = getTempfile('readline-sync.done'),
+    crypto = require('crypto'), shasum, decipher, password;
+
+  shasum = crypto.createHash(ALGORITHM_HASH);
+  shasum.update('' + process.pid + (salt++) + Math.random());
+  password = shasum.digest('hex');
+  decipher = crypto.createDecipher(ALGORITHM_CIPHER, password);
+
+  hostArgs = getHostArgs(options);
+  if (IS_WIN) {
+    shellPath = process.env.ComSpec || 'cmd.exe';
+    process.env.Q = '"'; // The quote (") that isn't escaped.
+    // `()` for ignore space by echo
+    shellArgs = ['/V:ON', '/S', '/C',
+      '(%Q%' + shellPath + '%Q% /V:ON /S /C %Q%' + /* ESLint bug? */ // eslint-disable-line no-path-concat
+        '%Q%' + extHostPath + '%Q%' +
+          hostArgs.map(function(arg) { return ' %Q%' + arg + '%Q%'; }).join('') +
+        ' & (echo !ERRORLEVEL!)>%Q%' + pathExit + '%Q%%Q%) 2>%Q%' + pathStderr + '%Q%' +
+      ' |%Q%' + process.execPath + '%Q% %Q%' + __dirname + '\\encrypt.js%Q%' +
+        ' %Q%' + ALGORITHM_CIPHER + '%Q% %Q%' + password + '%Q%' +
+        ' >%Q%' + pathStdout + '%Q%' +
+      ' & (echo 1)>%Q%' + pathDone + '%Q%'];
+  } else {
+    shellPath = '/bin/sh';
+    shellArgs = ['-c',
+      // Use `()`, not `{}` for `-c` (text param)
+      '("' + extHostPath + '"' + /* ESLint bug? */ // eslint-disable-line no-path-concat
+          hostArgs.map(function(arg) { return " '" + arg.replace(/'/g, "'\\''") + "'"; }).join('') +
+        '; echo $?>"' + pathExit + '") 2>"' + pathStderr + '"' +
+      ' |"' + process.execPath + '" "' + __dirname + '/encrypt.js"' +
+        ' "' + ALGORITHM_CIPHER + '" "' + password + '"' +
+        ' >"' + pathStdout + '"' +
+      '; echo 1 >"' + pathDone + '"'];
+  }
+  if (_DBG_checkMethod) { _DBG_checkMethod('_execFileSync', hostArgs); }
+  try {
+    childProc.spawn(shellPath, shellArgs, execOptions);
+  } catch (e) {
+    res.error = new Error(e.message);
+    res.error.method = '_execFileSync - spawn';
+    res.error.program = shellPath;
+    res.error.args = shellArgs;
+  }
+
+  while (fs.readFileSync(pathDone, {encoding: options.encoding}).trim() !== '1') {} // eslint-disable-line no-empty
+  if ((exitCode =
+      fs.readFileSync(pathExit, {encoding: options.encoding}).trim()) === '0') {
+    res.input =
+      decipher.update(fs.readFileSync(pathStdout, {encoding: 'binary'}),
+        'hex', options.encoding) +
+      decipher.final(options.encoding);
+  } else {
+    extMessage = fs.readFileSync(pathStderr, {encoding: options.encoding}).trim();
+    res.error = new Error(DEFAULT_ERR_MSG + (extMessage ? '\n' + extMessage : ''));
+    res.error.method = '_execFileSync';
+    res.error.program = shellPath;
+    res.error.args = shellArgs;
+    res.error.extMessage = extMessage;
+    res.error.exitCode = +exitCode;
+  }
+
+  fs.unlinkSync(pathStdout);
+  fs.unlinkSync(pathStderr);
+  fs.unlinkSync(pathExit);
+  fs.unlinkSync(pathDone);
+
+  return res;
+}
+
+function readlineExt(options) {
+  var hostArgs, res = {}, extMessage,
+    execOptions = {env: process.env, encoding: options.encoding};
+
+  if (!extHostPath) {
+    if (IS_WIN) {
+      if (process.env.PSModulePath) { // Windows PowerShell
+        extHostPath = 'powershell.exe';
+        extHostArgs = ['-ExecutionPolicy', 'Bypass', '-File', __dirname + '\\read.ps1']; // eslint-disable-line no-path-concat
+      } else {                        // Windows Script Host
+        extHostPath = 'cscript.exe';
+        extHostArgs = ['//nologo', __dirname + '\\read.cs.js']; // eslint-disable-line no-path-concat
+      }
+    } else {
+      extHostPath = '/bin/sh';
+      extHostArgs = [__dirname + '/read.sh']; // eslint-disable-line no-path-concat
+    }
+  }
+  if (IS_WIN && !process.env.PSModulePath) { // Windows Script Host
+    // ScriptPW (Win XP and Server2003) needs TTY stream as STDIN.
+    // In this case, If STDIN isn't TTY, an error is thrown.
+    execOptions.stdio = [process.stdin];
+  }
+
+  if (childProc.execFileSync) {
+    hostArgs = getHostArgs(options);
+    if (_DBG_checkMethod) { _DBG_checkMethod('execFileSync', hostArgs); }
+    try {
+      res.input = childProc.execFileSync(extHostPath, hostArgs, execOptions);
+    } catch (e) { // non-zero exit code
+      extMessage = e.stderr ? (e.stderr + '').trim() : '';
+      res.error = new Error(DEFAULT_ERR_MSG + (extMessage ? '\n' + extMessage : ''));
+      res.error.method = 'execFileSync';
+      res.error.program = extHostPath;
+      res.error.args = hostArgs;
+      res.error.extMessage = extMessage;
+      res.error.exitCode = e.status;
+      res.error.code = e.code;
+      res.error.signal = e.signal;
+    }
+  } else {
+    res = _execFileSync(options, execOptions);
+  }
+  if (!res.error) {
+    res.input = res.input.replace(/^\s*'|'\s*$/g, '');
+    options.display = '';
+  }
+
+  return res;
+}
+
 /*
   display:            string
   displayOnly:        boolean
@@ -89,13 +273,13 @@ function _readlineSync(options) {
       // Fixed v5.1.0         https://nodejs.org/en/blog/release/v5.1.0/
       // Fixed v4.2.4 (LTS)   https://nodejs.org/en/blog/release/v4.2.4/
       verNum = (function(ver) { // getVerNum
-          var nums = ver.replace(/^\D+/, '').split('.');
-          var verNum = 0;
-          if ((nums[0] = +nums[0])) { verNum += nums[0] * 10000; }
-          if ((nums[1] = +nums[1])) { verNum += nums[1] * 100; }
-          if ((nums[2] = +nums[2])) { verNum += nums[2]; }
-          return verNum;
-        })(process.version);
+        var nums = ver.replace(/^\D+/, '').split('.');
+        var verNum = 0;
+        if ((nums[0] = +nums[0])) { verNum += nums[0] * 10000; }
+        if ((nums[1] = +nums[1])) { verNum += nums[1] * 100; }
+        if ((nums[2] = +nums[2])) { verNum += nums[2]; }
+        return verNum;
+      })(process.version);
       if (!(verNum >= 20302 && verNum < 40204 || verNum >= 50000 && verNum < 50100) &&
           process.stdin.isTTY) {
         process.stdin.pause();
@@ -107,7 +291,7 @@ function _readlineSync(options) {
           // 'CONIN$' might fail on XP, 2000, 7 (x86).
           fdR = getFsB().open('CONIN$', constants.O_RDWR, parseInt('0666', 8));
           ttyR = new TTY(fdR, true);
-        } catch (e) {}
+        } catch (e) { /* ignore */ }
       }
 
       if (process.stdout.isTTY) {
@@ -115,11 +299,11 @@ function _readlineSync(options) {
       } else {
         try {
           fdW = fs.openSync('\\\\.\\CON', 'w');
-        } catch (e) {}
+        } catch (e) { /* ignore */ }
         if (typeof fdW !== 'number') { // Retry
           try {
             fdW = getFsB().open('CONOUT$', constants.O_RDWR, parseInt('0666', 8));
-          } catch (e) {}
+          } catch (e) { /* ignore */ }
         }
       }
 
@@ -129,13 +313,13 @@ function _readlineSync(options) {
         try {
           fdR = fs.openSync('/dev/tty', 'r'); // device file, not process.stdin
           ttyR = process.stdin._handle;
-        } catch (e) {}
+        } catch (e) { /* ignore */ }
       } else {
         // Node v0.12 read() fails.
         try {
           fdR = fs.openSync('/dev/tty', 'r');
           ttyR = new TTY(fdR, false);
-        } catch (e) {}
+        } catch (e) { /* ignore */ }
       }
 
       if (process.stdout.isTTY) {
@@ -143,7 +327,7 @@ function _readlineSync(options) {
       } else {
         try {
           fdW = fs.openSync('/dev/tty', 'w');
-        } catch (e) {}
+        } catch (e) { /* ignore */ }
       }
     }
   })();
@@ -197,7 +381,7 @@ function _readlineSync(options) {
       }
       chunk = readSize > 0 ? buffer.toString(options.encoding, 0, readSize) : '\n';
 
-      if (chunk && typeof(line = (chunk.match(/^(.*?)[\r\n]/) || [])[1]) === 'string') {
+      if (chunk && typeof (line = (chunk.match(/^(.*?)[\r\n]/) || [])[1]) === 'string') {
         chunk = line;
         atEol = true;
       }
@@ -236,195 +420,16 @@ function _readlineSync(options) {
     (lastInput = options.keepWhitespace || options.keyIn ? input : input.trim());
 }
 
-function readlineExt(options) {
-  var hostArgs, res = {}, extMessage,
-    execOptions = {env: process.env, encoding: options.encoding};
-
-  if (!extHostPath) {
-    if (IS_WIN) {
-      if (process.env.PSModulePath) { // Windows PowerShell
-        extHostPath = 'powershell.exe';
-        extHostArgs = ['-ExecutionPolicy', 'Bypass', '-File', __dirname + '\\read.ps1'];
-      } else {                        // Windows Script Host
-        extHostPath = 'cscript.exe';
-        extHostArgs = ['//nologo', __dirname + '\\read.cs.js'];
-      }
-    } else {
-      extHostPath = '/bin/sh';
-      extHostArgs = [__dirname + '/read.sh'];
-    }
-  }
-  if (IS_WIN && !process.env.PSModulePath) { // Windows Script Host
-    // ScriptPW (Win XP and Server2003) needs TTY stream as STDIN.
-    // In this case, If STDIN isn't TTY, an error is thrown.
-    execOptions.stdio = [process.stdin];
-  }
-
-  if (childProc.execFileSync) {
-    hostArgs = getHostArgs(options);
-    if (_DBG_checkMethod) { _DBG_checkMethod('execFileSync', hostArgs); }
-    try {
-      res.input = childProc.execFileSync(extHostPath, hostArgs, execOptions);
-    } catch (e) { // non-zero exit code
-      extMessage = e.stderr ? (e.stderr + '').trim() : '';
-      res.error = new Error(DEFAULT_ERR_MSG + (extMessage ? '\n' + extMessage : ''));
-      res.error.method = 'execFileSync';
-      res.error.program = extHostPath;
-      res.error.args = hostArgs;
-      res.error.extMessage = extMessage;
-      res.error.exitCode = e.status;
-      res.error.code = e.code;
-      res.error.signal = e.signal;
-    }
-  } else {
-    res = _execFileSync(options, execOptions);
-  }
-  if (!res.error) {
-    res.input = res.input.replace(/^\s*'|'\s*$/g, '');
-    options.display = '';
-  }
-
-  return res;
-}
-
-// piping via files (for Node v0.10-)
-function _execFileSync(options, execOptions) {
-
-  function getTempfile(name) {
-    var filepath, suffix = '', fd;
-    tempdir = tempdir || require('os').tmpdir();
-
-    while (true) {
-      filepath = pathUtil.join(tempdir, name + suffix);
-      try {
-        fd = fs.openSync(filepath, 'wx');
-      } catch (e) {
-        if (e.code === 'EEXIST') {
-          suffix++;
-          continue;
-        } else {
-          throw e;
-        }
-      }
-      fs.closeSync(fd);
-      break;
-    }
-    return filepath;
-  }
-
-  var hostArgs, shellPath, shellArgs, res = {}, exitCode, extMessage,
-    pathStdout  = getTempfile('readline-sync.stdout'),
-    pathStderr  = getTempfile('readline-sync.stderr'),
-    pathExit    = getTempfile('readline-sync.exit'),
-    pathDone    = getTempfile('readline-sync.done'),
-    crypto = require('crypto'), shasum, decipher, password;
-
-  shasum = crypto.createHash(ALGORITHM_HASH);
-  shasum.update('' + process.pid + (salt++) + Math.random());
-  password = shasum.digest('hex');
-  decipher = crypto.createDecipher(ALGORITHM_CIPHER, password);
-
-  hostArgs = getHostArgs(options);
-  if (IS_WIN) {
-    shellPath = process.env.ComSpec || 'cmd.exe';
-    process.env.Q = '"'; // The quote (") that isn't escaped.
-    // `()` for ignore space by echo
-    shellArgs = ['/V:ON', '/S', '/C',
-      '(%Q%' + shellPath + '%Q% /V:ON /S /C %Q%' +
-        '%Q%' + extHostPath + '%Q%' +
-          hostArgs.map(function(arg) { return ' %Q%' + arg + '%Q%'; }).join('') +
-        ' & (echo !ERRORLEVEL!)>%Q%' + pathExit + '%Q%%Q%) 2>%Q%' + pathStderr + '%Q%' +
-      ' |%Q%' + process.execPath + '%Q% %Q%' + __dirname + '\\encrypt.js%Q%' +
-        ' %Q%' + ALGORITHM_CIPHER + '%Q% %Q%' + password + '%Q%' +
-        ' >%Q%' + pathStdout + '%Q%' +
-      ' & (echo 1)>%Q%' + pathDone + '%Q%'];
-  } else {
-    shellPath = '/bin/sh';
-    shellArgs = ['-c',
-      // Use `()`, not `{}` for `-c` (text param)
-      '("' + extHostPath + '"' +
-          hostArgs.map(function(arg)
-            { return " '" + arg.replace(/'/g, "'\\''") + "'"; }).join('') +
-        '; echo $?>"' + pathExit + '") 2>"' + pathStderr + '"' +
-      ' |"' + process.execPath + '" "' + __dirname + '/encrypt.js"' +
-        ' "' + ALGORITHM_CIPHER + '" "' + password + '"' +
-        ' >"' + pathStdout + '"' +
-      '; echo 1 >"' + pathDone + '"'];
-  }
-  if (_DBG_checkMethod) { _DBG_checkMethod('_execFileSync', hostArgs); }
-  try {
-    childProc.spawn(shellPath, shellArgs, execOptions);
-  } catch (e) {
-    res.error = new Error(e.message);
-    res.error.method = '_execFileSync - spawn';
-    res.error.program = shellPath;
-    res.error.args = shellArgs;
-  }
-
-  while (fs.readFileSync(pathDone, {encoding: options.encoding}).trim() !== '1') {}
-  if ((exitCode =
-      fs.readFileSync(pathExit, {encoding: options.encoding}).trim()) === '0') {
-    res.input =
-      decipher.update(fs.readFileSync(pathStdout, {encoding: 'binary'}),
-        'hex', options.encoding) +
-      decipher.final(options.encoding);
-  } else {
-    extMessage = fs.readFileSync(pathStderr, {encoding: options.encoding}).trim();
-    res.error = new Error(DEFAULT_ERR_MSG + (extMessage ? '\n' + extMessage : ''));
-    res.error.method = '_execFileSync';
-    res.error.program = shellPath;
-    res.error.args = shellArgs;
-    res.error.extMessage = extMessage;
-    res.error.exitCode = +exitCode;
-  }
-
-  fs.unlinkSync(pathStdout);
-  fs.unlinkSync(pathStderr);
-  fs.unlinkSync(pathExit);
-  fs.unlinkSync(pathDone);
-
-  return res;
-}
-
-function getHostArgs(options) {
-  // Send any text to crazy Windows shell safely.
-  function encodeArg(arg) {
-    return arg.replace(/[^\w\u0080-\uFFFF]/g, function(chr) {
-      return '#' + chr.charCodeAt(0) + ';';
-    });
-  }
-
-  return extHostArgs.concat((function(conf) {
-    var args = [];
-    Object.keys(conf).forEach(function(optionName) {
-      if (conf[optionName] === 'boolean') {
-        if (options[optionName]) { args.push('--' + optionName); }
-      } else if (conf[optionName] === 'string') {
-        if (options[optionName]) {
-          args.push('--' + optionName, encodeArg(options[optionName]));
-        }
-      }
-    });
-    return args;
-  })({
-    display:        'string',
-    displayOnly:    'boolean',
-    keyIn:          'boolean',
-    hideEchoBack:   'boolean',
-    mask:           'string',
-    limit:          'string',
-    caseSensitive:  'boolean'
-  }));
-}
-
 function flattenArray(array, validator) {
   var flatArray = [];
   function _flattenArray(array) {
-    /* jshint eqnull:true */
-    if (array == null) { return; }
-    /* jshint eqnull:false */
-    else if (Array.isArray(array)) { array.forEach(_flattenArray); }
-    else if (!validator || validator(array)) { flatArray.push(array); }
+    if (array == null) { // eslint-disable-line eqeqeq
+      return;
+    } else if (Array.isArray(array)) {
+      array.forEach(_flattenArray);
+    } else if (!validator || validator(array)) {
+      flatArray.push(array);
+    }
   }
   _flattenArray(array);
   return flatArray;
@@ -451,9 +456,7 @@ function margeOptions() {
   }
 
   return optionsList.reduce(function(options, optionsPart) {
-    /* jshint eqnull:true */
-    if (optionsPart == null) { return options; }
-    /* jshint eqnull:false */
+    if (optionsPart == null) { return options; } // eslint-disable-line eqeqeq
 
     // ======== DEPRECATED ========
     if (optionsPart.hasOwnProperty('noEchoBack') &&
@@ -473,24 +476,22 @@ function margeOptions() {
       var value;
       if (!optionsPart.hasOwnProperty(optionName)) { return; }
       value = optionsPart[optionName];
-      switch (optionName) {
+      switch (optionName) { // eslint-disable-line default-case
                            // _readlineSync <- *    * -> defaultOptions
         // ================ string
         case 'mask':                        // *    *
         case 'limitMessage':                //      *
         case 'defaultInput':                //      *
         case 'encoding':                    // *    *
-          /* jshint eqnull:true */
-          value = value != null ? value + '' : '';
-          /* jshint eqnull:false */
-          if (value && optionName !== 'limitMessage')
-            { value = value.replace(/[\r\n]/g, ''); }
+          value = value != null ? value + '' : ''; // eslint-disable-line eqeqeq
+          if (value && optionName !== 'limitMessage') { value = value.replace(/[\r\n]/g, ''); }
           options[optionName] = value;
           break;
         // ================ number(int)
         case 'bufferSize':                  // *    *
-          if (!isNaN(value = parseInt(value, 10)) && typeof value === 'number')
-            { options[optionName] = value; } // limited updating (number is needed)
+          if (!isNaN(value = parseInt(value, 10)) && typeof value === 'number') {
+            options[optionName] = value; // limited updating (number is needed)
+          }
           break;
         // ================ boolean
         case 'displayOnly':                 // *
@@ -507,12 +508,12 @@ function margeOptions() {
         case 'trueValue':                   //      *
         case 'falseValue':                  //      *
           options[optionName] = flattenArray(value, function(value) {
-              var type = typeof value;
-              return type === 'string' || type === 'number' ||
-                type === 'function' || value instanceof RegExp;
-            }).map(function(value) {
-              return typeof value === 'string' ? value.replace(/[\r\n]/g, '') : value;
-            });
+            var type = typeof value;
+            return type === 'string' || type === 'number' ||
+              type === 'function' || value instanceof RegExp;
+          }).map(function(value) {
+            return typeof value === 'string' ? value.replace(/[\r\n]/g, '') : value;
+          });
           break;
         // ================ function
         case 'print':                       // *    *
@@ -523,9 +524,7 @@ function margeOptions() {
         // ================ other
         case 'prompt':                      //      *
         case 'display':                     // *
-          /* jshint eqnull:true */
-          options[optionName] = value != null ? value : '';
-          /* jshint eqnull:false */
+          options[optionName] = value != null ? value : ''; // eslint-disable-line eqeqeq
           break;
       }
     });
@@ -538,7 +537,7 @@ function isMatched(res, comps, caseSensitive) {
     var type = typeof comp;
     return type === 'string' ?
         (caseSensitive ? res === comp : res.toLowerCase() === comp.toLowerCase()) :
-      type === 'number' ?  parseFloat(res) === comp :
+      type === 'number' ? parseFloat(res) === comp :
       type === 'function' ? comp(res) :
       comp instanceof RegExp ? comp.test(res) : false;
   });
@@ -561,7 +560,7 @@ function replacePlaceholder(text, generator) {
 
   function getPlaceholderText(s, escape, placeholder, pre, param, post) {
     var text;
-    return escape || typeof(text = generator(param)) !== 'string' ? placeholder :
+    return escape || typeof (text = generator(param)) !== 'string' ? placeholder :
       text ? (pre || '') + text + (post || '') : '';
   }
 
@@ -581,8 +580,8 @@ function array2charlist(array, caseSensitive, collectSymbols) {
     return groups;
   }
 
-  values = array.reduce(function(chars, value)
-      { return chars.concat((value + '').split('')); }, [])
+  values = array.reduce(
+      function(chars, value) { return chars.concat((value + '').split('')); }, [])
     .reduce(function(groups, curChar) {
       var curGroupClass, curCharCode;
       if (!caseSensitive) { curChar = curChar.toLowerCase(); }
@@ -609,8 +608,9 @@ function array2charlist(array, caseSensitive, collectSymbols) {
   return {values: values, suppressed: suppressed};
 }
 
-function joinChunks(chunks, suppressed)
-  { return chunks.join(chunks.length > 2 ? ', ' : suppressed ? ' / ' : '/'); }
+function joinChunks(chunks, suppressed) {
+  return chunks.join(chunks.length > 2 ? ', ' : suppressed ? ' / ' : '/');
+}
 
 function getPhContent(param, options) {
   var text, values, resCharlist = {}, arg;
@@ -665,8 +665,11 @@ function getPhContent(param, options) {
       case 'CWD':
       case 'cwdHome':
         text = process.cwd();
-        if (param === 'CWD') { text = pathUtil.basename(text); }
-        else if (param === 'cwdHome') { text = replaceHomePath(text); }
+        if (param === 'CWD') {
+          text = pathUtil.basename(text);
+        } else if (param === 'cwdHome') {
+          text = replaceHomePath(text);
+        }
         break;
       case 'date':
       case 'time':
@@ -677,7 +680,7 @@ function getPhContent(param, options) {
           'String']();
         break;
       default: // with arg
-        if (typeof(arg = (param.match(/^history_m(\d+)$/) || [])[1]) === 'string') {
+        if (typeof (arg = (param.match(/^history_m(\d+)$/) || [])[1]) === 'string') {
           text = inputHistory[inputHistory.length - arg] || '';
         }
     }
@@ -687,12 +690,11 @@ function getPhContent(param, options) {
 
 function getPhCharlist(param) {
   var matches = /^(.)-(.)$/.exec(param), text = '', from, to, code, step;
-  if (!matches) { return; }
+  if (!matches) { return null; }
   from = matches[1].charCodeAt(0);
   to = matches[2].charCodeAt(0);
   step = from < to ? 1 : -1;
-  for (code = from; code !== to + step; code += step)
-    { text += String.fromCharCode(code); }
+  for (code = from; code !== to + step; code += step) { text += String.fromCharCode(code); } /* ESLint bug */ // eslint-disable-line no-unmodified-loop-condition
   return text;
 }
 
@@ -724,9 +726,9 @@ function toBool(res, options) {
 function getValidLine(options) {
   var res, forceNext, limitMessage,
     matches, histInput, args, resCheck;
+
   function _getPhContent(param) { return getPhContent(param, options); }
-  function addDisplay(text)
-    { options.display += (/[^\r\n]$/.test(options.display) ? '\n' : '') + text; }
+  function addDisplay(text) { options.display += (/[^\r\n]$/.test(options.display) ? '\n' : '') + text; }
 
   options.limitSrc = options.limit;
   options.displaySrc = options.display;
@@ -743,8 +745,11 @@ function getValidLine(options) {
     if (options.history) {
       if ((matches = /^\s*\!(?:\!|-1)(:p)?\s*$/.exec(res))) { // `!!` `!-1` +`:p`
         histInput = inputHistory[0] || '';
-        if (matches[1]) { forceNext = true; }  // only display
-        else            { res = histInput; }   // replace input
+        if (matches[1]) { // only display
+          forceNext = true;
+        } else { // replace input
+          res = histInput;
+        }
         // Show it even if it is empty (NL only).
         addDisplay(histInput + '\n');
         if (!forceNext) { // Loop may break
@@ -759,7 +764,7 @@ function getValidLine(options) {
 
     if (!forceNext && options.cd && res) {
       args = parseCl(res);
-      switch (args[0].toLowerCase()) {
+      switch (args[0].toLowerCase()) { // eslint-disable-line default-case
         case 'cd':
           if (args[1]) {
             try {
@@ -786,8 +791,9 @@ function getValidLine(options) {
     if (!forceNext) {
       if (!options.limitSrc.length ||
         isMatched(res, options.limitSrc, options.caseSensitive)) { break; }
-      if (options.limitMessage)
-        { limitMessage = replacePlaceholder(options.limitMessage, _getPhContent); }
+      if (options.limitMessage) {
+        limitMessage = replacePlaceholder(options.limitMessage, _getPhContent);
+      }
     }
 
     addDisplay((limitMessage ? limitMessage + '\n' : '') +
@@ -810,9 +816,11 @@ exports.setDefaultOptions = function(options) {
 };
 
 exports.question = function(query, options) {
+  /* eslint-disable key-spacing */
   return getValidLine(margeOptions(margeOptions(true, options), {
-      display:            query
-    }));
+    display:            query
+  }));
+  /* eslint-enable key-spacing */
 };
 
 exports.prompt = function(options) {
@@ -822,18 +830,20 @@ exports.prompt = function(options) {
 };
 
 exports.keyIn = function(query, options) {
+  /* eslint-disable key-spacing */
   var readOptions = margeOptions(margeOptions(true, options), {
-      display:            query,
-      keyIn:              true,
-      keepWhitespace:     true
-    });
+    display:            query,
+    keyIn:              true,
+    keepWhitespace:     true
+  });
+  /* eslint-enable key-spacing */
 
   // char list
   readOptions.limitSrc = readOptions.limit.filter(function(value) {
-      var type = typeof value;
-      return type === 'string' || type === 'number';
-    })
-    .map(function(text) { return replacePlaceholder(text + '', getPhCharlist); });
+    var type = typeof value;
+    return type === 'string' || type === 'number';
+  })
+  .map(function(text) { return replacePlaceholder(text + '', getPhCharlist); });
   // pattern
   readOptions.limit = escapePattern(readOptions.limitSrc.join(''));
 
@@ -856,26 +866,28 @@ exports.keyIn = function(query, options) {
 // ------------------------------------
 
 exports.questionEMail = function(query, options) {
-  /* jshint eqnull:true */
-  if (query == null) { query = 'Input e-mail address :'; }
-  /* jshint eqnull:false */
+  if (query == null) { query = 'Input e-mail address :'; } // eslint-disable-line eqeqeq
+  /* eslint-disable key-spacing */
   return exports.question(query, margeOptions({
-      // -------- default
-      hideEchoBack:       false,
-      // http://www.w3.org/TR/html5/forms.html#valid-e-mail-address
-      limit:              /^[a-zA-Z0-9.!#$%&'*+\/=?^_`{|}~-]+@[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?(?:\.[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?)*$/,
-      limitMessage:       'Input valid e-mail address, please.',
-      trueValue:          null,
-      falseValue:         null
-    }, options, {
-      // -------- forced
-      keepWhitespace:     false,
-      cd:                 false
-    }));
+    // -------- default
+    hideEchoBack:       false,
+    // http://www.w3.org/TR/html5/forms.html#valid-e-mail-address
+    limit:              /^[a-zA-Z0-9.!#$%&'*+\/=?^_`{|}~-]+@[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?(?:\.[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?)*$/,
+    limitMessage:       'Input valid e-mail address, please.',
+    trueValue:          null,
+    falseValue:         null
+  }, options, {
+    // -------- forced
+    keepWhitespace:     false,
+    cd:                 false
+  }));
+  /* eslint-enable key-spacing */
 };
 
 exports.questionNewPassword = function(query, options) {
-  var readOptions = margeOptions({
+  /* eslint-disable key-spacing */
+  var resCharlist, min, max,
+    readOptions = margeOptions({
       // -------- default
       hideEchoBack:       true,
       mask:               '*',
@@ -890,13 +902,14 @@ exports.questionNewPassword = function(query, options) {
       cd:                 false,
       // limit (by charlist etc.),
       phContent: function(param) {
-          return param === 'charlist' ? resCharlist.text :
-            param === 'length' ? min + '...' + max : null;
-        }
+        return param === 'charlist' ? resCharlist.text :
+          param === 'length' ? min + '...' + max : null;
+      }
     }),
     // added:     charlist, min, max, confirmMessage, unmatchMessage
-    charlist, min, max, confirmMessage, unmatchMessage,
-    limit, resCharlist, limitMessage, res1, res2;
+    charlist, confirmMessage, unmatchMessage,
+    limit, limitMessage, res1, res2;
+  /* eslint-enable key-spacing */
   options = options || {};
 
   charlist = replacePlaceholder(
@@ -908,17 +921,13 @@ exports.questionNewPassword = function(query, options) {
   resCharlist = array2charlist([charlist], readOptions.caseSensitive, true);
   resCharlist.text = joinChunks(resCharlist.values, resCharlist.suppressed);
 
-  /* jshint eqnull:true */
-  confirmMessage = options.confirmMessage != null ? options.confirmMessage :
+  confirmMessage = options.confirmMessage != null ? options.confirmMessage : // eslint-disable-line eqeqeq
     'Reinput a same one to confirm it :';
-  unmatchMessage = options.unmatchMessage != null ? options.unmatchMessage :
+  unmatchMessage = options.unmatchMessage != null ? options.unmatchMessage : // eslint-disable-line eqeqeq
     'It differs from first one.' +
       ' Hit only the Enter key if you want to retry from first one.';
-  /* jshint eqnull:false */
 
-  /* jshint eqnull:true */
-  if (query == null) { query = 'Input new password :'; }
-  /* jshint eqnull:false */
+  if (query == null) { query = 'Input new password :'; } // eslint-disable-line eqeqeq
 
   limitMessage = readOptions.limitMessage;
   while (!res2) {
@@ -940,15 +949,17 @@ function _questionNum(query, options, parser) {
     validValue = parser(value);
     return !isNaN(validValue) && typeof validValue === 'number';
   }
+  /* eslint-disable key-spacing */
   exports.question(query, margeOptions({
-      // -------- default
-      limitMessage:       'Input valid number, please.'
-    }, options, {
-      // -------- forced
-      limit:              getValidValue,
-      cd:                 false
-      // trueValue, falseValue, caseSensitive, keepWhitespace don't work.
-    }));
+    // -------- default
+    limitMessage:       'Input valid number, please.'
+  }, options, {
+    // -------- forced
+    limit:              getValidValue,
+    cd:                 false
+    // trueValue, falseValue, caseSensitive, keepWhitespace don't work.
+  }));
+  /* eslint-enable key-spacing */
   return validValue;
 }
 exports.questionInt = function(query, options) {
@@ -959,7 +970,9 @@ exports.questionFloat = function(query, options) {
 };
 
 exports.questionPath = function(query, options) {
-  var readOptions = margeOptions({
+  /* eslint-disable key-spacing */
+  var validPath, error = '',
+    readOptions = margeOptions({
       // -------- default
       hideEchoBack:       false,
       limitMessage:       '$<error(\n)>Input valid path, please.' +
@@ -970,82 +983,80 @@ exports.questionPath = function(query, options) {
       // -------- forced
       keepWhitespace:     false,
       limit: function(value) {
-          var exists, stat, res;
-          value = replaceHomePath(value, true);
-          error = ''; // for validate
-          // mkdir -p
-          function mkdirParents(dirPath) {
-            dirPath.split(/\/|\\/).reduce(function(parents, dir) {
-              var path = pathUtil.resolve((parents += dir + pathUtil.sep));
-              if (!fs.existsSync(path)) {
-                fs.mkdirSync(path);
-              } else if (!fs.statSync(path).isDirectory()) {
-                throw new Error('Non directory already exists: ' + path);
-              }
-              return parents;
-            }, '');
-          }
+        var exists, stat, res;
+        value = replaceHomePath(value, true);
+        error = ''; // for validate
+        // mkdir -p
+        function mkdirParents(dirPath) {
+          dirPath.split(/\/|\\/).reduce(function(parents, dir) {
+            var path = pathUtil.resolve((parents += dir + pathUtil.sep));
+            if (!fs.existsSync(path)) {
+              fs.mkdirSync(path);
+            } else if (!fs.statSync(path).isDirectory()) {
+              throw new Error('Non directory already exists: ' + path);
+            }
+            return parents;
+          }, '');
+        }
 
-          try {
-            exists = fs.existsSync(value);
-            validPath = exists ? fs.realpathSync(value) : pathUtil.resolve(value);
-            // options.exists default: true, not-bool: no-check
-            if (!options.hasOwnProperty('exists') && !exists ||
-                typeof options.exists === 'boolean' && options.exists !== exists) {
-              error = (exists ? 'Already exists' : 'No such file or directory') +
-                ': ' + validPath;
-              return;
-            }
-            if (!exists && options.create) {
-              if (options.isDirectory) {
-                mkdirParents(validPath);
-              } else {
-                mkdirParents(pathUtil.dirname(validPath));
-                fs.closeSync(fs.openSync(validPath, 'w')); // touch
-              }
-              validPath = fs.realpathSync(validPath);
-            }
-            if (exists && (options.min || options.max ||
-                options.isFile || options.isDirectory)) {
-              stat = fs.statSync(validPath);
-              // type check first (directory has zero size)
-              if (options.isFile && !stat.isFile()) {
-                error = 'Not file: ' + validPath;
-                return;
-              } else if (options.isDirectory && !stat.isDirectory()) {
-                error = 'Not directory: ' + validPath;
-                return;
-              } else if (options.min && stat.size < +options.min ||
-                  options.max && stat.size > +options.max) {
-                error = 'Size ' + stat.size +' is out of range: ' + validPath;
-                return;
-              }
-            }
-            if (typeof options.validate === 'function' &&
-                (res = options.validate(validPath)) !== true) {
-              if (typeof res === 'string') { error = res; }
-              return;
-            }
-          } catch (e) {
-            error = e + '';
-            return;
+        try {
+          exists = fs.existsSync(value);
+          validPath = exists ? fs.realpathSync(value) : pathUtil.resolve(value);
+          // options.exists default: true, not-bool: no-check
+          if (!options.hasOwnProperty('exists') && !exists ||
+              typeof options.exists === 'boolean' && options.exists !== exists) {
+            error = (exists ? 'Already exists' : 'No such file or directory') +
+              ': ' + validPath;
+            return false;
           }
-          return true;
-        },
+          if (!exists && options.create) {
+            if (options.isDirectory) {
+              mkdirParents(validPath);
+            } else {
+              mkdirParents(pathUtil.dirname(validPath));
+              fs.closeSync(fs.openSync(validPath, 'w')); // touch
+            }
+            validPath = fs.realpathSync(validPath);
+          }
+          if (exists && (options.min || options.max ||
+              options.isFile || options.isDirectory)) {
+            stat = fs.statSync(validPath);
+            // type check first (directory has zero size)
+            if (options.isFile && !stat.isFile()) {
+              error = 'Not file: ' + validPath;
+              return false;
+            } else if (options.isDirectory && !stat.isDirectory()) {
+              error = 'Not directory: ' + validPath;
+              return false;
+            } else if (options.min && stat.size < +options.min ||
+                options.max && stat.size > +options.max) {
+              error = 'Size ' + stat.size + ' is out of range: ' + validPath;
+              return false;
+            }
+          }
+          if (typeof options.validate === 'function' &&
+              (res = options.validate(validPath)) !== true) {
+            if (typeof res === 'string') { error = res; }
+            return false;
+          }
+        } catch (e) {
+          error = e + '';
+          return false;
+        }
+        return true;
+      },
       // trueValue, falseValue, caseSensitive don't work.
       phContent: function(param) {
-          return param === 'error' ? error :
-            param !== 'min' && param !== 'max' ? null :
-            options.hasOwnProperty(param) ? options[param] + '' : '';
-        }
-    }),
+        return param === 'error' ? error :
+          param !== 'min' && param !== 'max' ? null :
+          options.hasOwnProperty(param) ? options[param] + '' : '';
+      }
+    });
     // added:     exists, create, min, max, isFile, isDirectory, validate
-    validPath, error = '';
+  /* eslint-enable key-spacing */
   options = options || {};
 
-  /* jshint eqnull:true */
-  if (query == null) { query = 'Input path (you can "cd" and "pwd") :'; }
-  /* jshint eqnull:false */
+  if (query == null) { query = 'Input path (you can "cd" and "pwd") :'; } // eslint-disable-line eqeqeq
 
   exports.question(query, readOptions);
   return validPath;
@@ -1090,6 +1101,7 @@ function getClHandler(commandHandler, options) {
 }
 
 exports.promptCL = function(commandHandler, options) {
+  /* eslint-disable key-spacing */
   var readOptions = margeOptions({
       // -------- default
       hideEchoBack:       false,
@@ -1101,6 +1113,7 @@ exports.promptCL = function(commandHandler, options) {
       // trueValue, falseValue, keepWhitespace don't work.
       // preCheck, limit (by clHandler)
     clHandler = getClHandler(commandHandler, readOptions);
+  /* eslint-enable key-spacing */
   readOptions.limit = clHandler.limit;
   readOptions.preCheck = clHandler.preCheck;
   exports.prompt(readOptions);
@@ -1108,19 +1121,22 @@ exports.promptCL = function(commandHandler, options) {
 };
 
 exports.promptLoop = function(inputHandler, options) {
+  /* eslint-disable key-spacing */
   var readOptions = margeOptions({
-      // -------- default
-      hideEchoBack:       false,
-      trueValue:          null,
-      falseValue:         null,
-      caseSensitive:      false,
-      history:            true
-    }, options);
+    // -------- default
+    hideEchoBack:       false,
+    trueValue:          null,
+    falseValue:         null,
+    caseSensitive:      false,
+    history:            true
+  }, options);
+  /* eslint-enable key-spacing */
   while (true) { if (inputHandler(exports.prompt(readOptions))) { break; } }
   return;
 };
 
 exports.promptCLLoop = function(commandHandler, options) {
+  /* eslint-disable key-spacing */
   var readOptions = margeOptions({
       // -------- default
       hideEchoBack:       false,
@@ -1132,6 +1148,7 @@ exports.promptCLLoop = function(commandHandler, options) {
       // trueValue, falseValue, keepWhitespace don't work.
       // preCheck, limit (by clHandler)
     clHandler = getClHandler(commandHandler, readOptions);
+  /* eslint-enable key-spacing */
   readOptions.limit = clHandler.limit;
   readOptions.preCheck = clHandler.preCheck;
   while (true) {
@@ -1142,66 +1159,70 @@ exports.promptCLLoop = function(commandHandler, options) {
 };
 
 exports.promptSimShell = function(options) {
+  /* eslint-disable key-spacing */
   return exports.prompt(margeOptions({
-      // -------- default
-      hideEchoBack:       false,
-      history:            true
-    }, options, {
-      // -------- forced
-      prompt:             (function() {
-        return IS_WIN ?
-          '$<cwd>>' :
-          // 'user@host:cwd$ '
-          (process.env.USER || '') +
-          (process.env.HOSTNAME ?
-            '@' + process.env.HOSTNAME.replace(/\..*$/, '') : '') +
-          ':$<cwdHome>$ ';
-      })()
-    }));
+    // -------- default
+    hideEchoBack:       false,
+    history:            true
+  }, options, {
+    // -------- forced
+    prompt:             (function() {
+      return IS_WIN ?
+        '$<cwd>>' :
+        // 'user@host:cwd$ '
+        (process.env.USER || '') +
+        (process.env.HOSTNAME ?
+          '@' + process.env.HOSTNAME.replace(/\..*$/, '') : '') +
+        ':$<cwdHome>$ ';
+    })()
+  }));
+  /* eslint-enable key-spacing */
 };
 
 function _keyInYN(query, options, limit) {
   var res;
-  /* jshint eqnull:true */
-  if (query == null) { query = 'Are you sure? :'; }
-  /* jshint eqnull:false */
-  if ((!options || options.guide !== false) && (query += ''))
-    { query = query.replace(/\s*:?\s*$/, '') + ' [y/n] :'; }
+  if (query == null) { query = 'Are you sure? :'; } // eslint-disable-line eqeqeq
+  if ((!options || options.guide !== false) && (query += '')) {
+    query = query.replace(/\s*:?\s*$/, '') + ' [y/n] :';
+  }
+  /* eslint-disable key-spacing */
   res = exports.keyIn(query, margeOptions(options, {
-      // -------- forced
-      hideEchoBack:       false,
-      limit:              limit,
-      trueValue:          'y',
-      falseValue:         'n',
-      caseSensitive:      false
-      // mask doesn't work.
-    }));
-    // added:     guide
+    // -------- forced
+    hideEchoBack:       false,
+    limit:              limit,
+    trueValue:          'y',
+    falseValue:         'n',
+    caseSensitive:      false
+    // mask doesn't work.
+  }));
+  // added:     guide
+  /* eslint-enable key-spacing */
   return typeof res === 'boolean' ? res : '';
 }
 exports.keyInYN = function(query, options) { return _keyInYN(query, options); };
-exports.keyInYNStrict = function(query, options)
-  { return _keyInYN(query, options, 'yn'); };
+exports.keyInYNStrict = function(query, options) { return _keyInYN(query, options, 'yn'); };
 
 exports.keyInPause = function(query, options) {
-  /* jshint eqnull:true */
-  if (query == null) { query = 'Continue...'; }
-  /* jshint eqnull:false */
-  if ((!options || options.guide !== false) && (query += ''))
-    { query = query.replace(/\s+$/, '') + ' (Hit any key)'; }
+  if (query == null) { query = 'Continue...'; } // eslint-disable-line eqeqeq
+  if ((!options || options.guide !== false) && (query += '')) {
+    query = query.replace(/\s+$/, '') + ' (Hit any key)';
+  }
+  /* eslint-disable key-spacing */
   exports.keyIn(query, margeOptions({
-      // -------- default
-      limit:              null
-    }, options, {
-      // -------- forced
-      hideEchoBack:       true,
-      mask:               ''
-    }));
-    // added:     guide
+    // -------- default
+    limit:              null
+  }, options, {
+    // -------- forced
+    hideEchoBack:       true,
+    mask:               ''
+  }));
+  // added:     guide
+  /* eslint-enable key-spacing */
   return;
 };
 
 exports.keyInSelect = function(items, query, options) {
+  /* eslint-disable key-spacing */
   var readOptions = margeOptions({
       // -------- default
       hideEchoBack:       false
@@ -1212,15 +1233,17 @@ exports.keyInSelect = function(items, query, options) {
       caseSensitive:      false,
       // limit (by items),
       phContent: function(param) {
-          return param === 'itemsCount' ? items.length + '' :
-            param === 'firstItem' ? (items[0] + '').trim() :
-            param === 'lastItem' ? (items[items.length - 1] + '').trim() : null;
-        }
+        return param === 'itemsCount' ? items.length + '' :
+          param === 'firstItem' ? (items[0] + '').trim() :
+          param === 'lastItem' ? (items[items.length - 1] + '').trim() : null;
+      }
     }),
     // added:     guide, cancel
     keylist = '', key2i = {}, charCode = 49 /* '1' */, display = '\n';
-  if (!Array.isArray(items) || !items.length || items.length > 35)
-    { throw '`items` must be Array (max length: 35).'; }
+  /* eslint-enable key-spacing */
+  if (!Array.isArray(items) || !items.length || items.length > 35) {
+    throw '`items` must be Array (max length: 35).';
+  }
 
   items.forEach(function(item, i) {
     var key = String.fromCharCode(charCode);
@@ -1232,21 +1255,18 @@ exports.keyInSelect = function(items, query, options) {
   if (!options || options.cancel !== false) {
     keylist += '0';
     key2i['0'] = -1;
-    /* jshint eqnull:true */
-    display += '[' + '0' + '] ' +
-      (options && options.cancel != null && typeof options.cancel !== 'boolean' ?
+    display += '[0] ' +
+      (options && options.cancel != null && typeof options.cancel !== 'boolean' ? // eslint-disable-line eqeqeq
         (options.cancel + '').trim() : 'CANCEL') + '\n';
-    /* jshint eqnull:false */
   }
   readOptions.limit = keylist;
   display += '\n';
 
-  /* jshint eqnull:true */
-  if (query == null) { query = 'Choose one from list :'; }
-  /* jshint eqnull:false */
+  if (query == null) { query = 'Choose one from list :'; } // eslint-disable-line eqeqeq
   if ((query += '')) {
-    if (!options || options.guide !== false)
-      { query = query.replace(/\s*:?\s*$/, '') + ' [$<limit>] :'; }
+    if (!options || options.guide !== false) {
+      query = query.replace(/\s*:?\s*$/, '') + ' [$<limit>] :';
+    }
     display += query;
   }