first commit

app_vue/node_modules/commander/lib/argument.js

@@ -0,0 +1,147 @@
+const { InvalidArgumentError } = require('./error.js');
+
+// @ts-check
+
+class Argument {
+  /**
+   * Initialize a new command argument with the given name and description.
+   * The default is that the argument is required, and you can explicitly
+   * indicate this with <> around the name. Put [] around the name for an optional argument.
+   *
+   * @param {string} name
+   * @param {string} [description]
+   */
+
+  constructor(name, description) {
+    this.description = description || '';
+    this.variadic = false;
+    this.parseArg = undefined;
+    this.defaultValue = undefined;
+    this.defaultValueDescription = undefined;
+    this.argChoices = undefined;
+
+    switch (name[0]) {
+      case '<': // e.g. <required>
+        this.required = true;
+        this._name = name.slice(1, -1);
+        break;
+      case '[': // e.g. [optional]
+        this.required = false;
+        this._name = name.slice(1, -1);
+        break;
+      default:
+        this.required = true;
+        this._name = name;
+        break;
+    }
+
+    if (this._name.length > 3 && this._name.slice(-3) === '...') {
+      this.variadic = true;
+      this._name = this._name.slice(0, -3);
+    }
+  }
+
+  /**
+   * Return argument name.
+   *
+   * @return {string}
+   */
+
+  name() {
+    return this._name;
+  };
+
+  /**
+   * @api private
+   */
+
+  _concatValue(value, previous) {
+    if (previous === this.defaultValue || !Array.isArray(previous)) {
+      return [value];
+    }
+
+    return previous.concat(value);
+  }
+
+  /**
+   * Set the default value, and optionally supply the description to be displayed in the help.
+   *
+   * @param {any} value
+   * @param {string} [description]
+   * @return {Argument}
+   */
+
+  default(value, description) {
+    this.defaultValue = value;
+    this.defaultValueDescription = description;
+    return this;
+  };
+
+  /**
+   * Set the custom handler for processing CLI command arguments into argument values.
+   *
+   * @param {Function} [fn]
+   * @return {Argument}
+   */
+
+  argParser(fn) {
+    this.parseArg = fn;
+    return this;
+  };
+
+  /**
+   * Only allow option value to be one of choices.
+   *
+   * @param {string[]} values
+   * @return {Argument}
+   */
+
+  choices(values) {
+    this.argChoices = values;
+    this.parseArg = (arg, previous) => {
+      if (!values.includes(arg)) {
+        throw new InvalidArgumentError(`Allowed choices are ${values.join(', ')}.`);
+      }
+      if (this.variadic) {
+        return this._concatValue(arg, previous);
+      }
+      return arg;
+    };
+    return this;
+  };
+
+  /**
+   * Make option-argument required.
+   */
+  argRequired() {
+    this.required = true;
+    return this;
+  }
+
+  /**
+   * Make option-argument optional.
+   */
+  argOptional() {
+    this.required = false;
+    return this;
+  }
+}
+
+/**
+ * Takes an argument and returns its human readable equivalent for help usage.
+ *
+ * @param {Argument} arg
+ * @return {string}
+ * @api private
+ */
+
+function humanReadableArgName(arg) {
+  const nameOutput = arg.name() + (arg.variadic === true ? '...' : '');
+
+  return arg.required
+    ? '<' + nameOutput + '>'
+    : '[' + nameOutput + ']';
+}
+
+exports.Argument = Argument;
+exports.humanReadableArgName = humanReadableArgName;

app_vue/node_modules/commander/lib/error.js

@@ -0,0 +1,45 @@
+// @ts-check
+
+/**
+ * CommanderError class
+ * @class
+ */
+class CommanderError extends Error {
+  /**
+   * Constructs the CommanderError class
+   * @param {number} exitCode suggested exit code which could be used with process.exit
+   * @param {string} code an id string representing the error
+   * @param {string} message human-readable description of the error
+   * @constructor
+   */
+  constructor(exitCode, code, message) {
+    super(message);
+    // properly capture stack trace in Node.js
+    Error.captureStackTrace(this, this.constructor);
+    this.name = this.constructor.name;
+    this.code = code;
+    this.exitCode = exitCode;
+    this.nestedError = undefined;
+  }
+}
+
+/**
+ * InvalidArgumentError class
+ * @class
+ */
+class InvalidArgumentError extends CommanderError {
+  /**
+   * Constructs the InvalidArgumentError class
+   * @param {string} [message] explanation of why argument is invalid
+   * @constructor
+   */
+  constructor(message) {
+    super(1, 'commander.invalidArgument', message);
+    // properly capture stack trace in Node.js
+    Error.captureStackTrace(this, this.constructor);
+    this.name = this.constructor.name;
+  }
+}
+
+exports.CommanderError = CommanderError;
+exports.InvalidArgumentError = InvalidArgumentError;

app_vue/node_modules/commander/lib/help.js

@@ -0,0 +1,396 @@
+const { humanReadableArgName } = require('./argument.js');
+
+/**
+ * TypeScript import types for JSDoc, used by Visual Studio Code IntelliSense and `npm run typescript-checkJS`
+ * https://www.typescriptlang.org/docs/handbook/jsdoc-supported-types.html#import-types
+ * @typedef { import("./argument.js").Argument } Argument
+ * @typedef { import("./command.js").Command } Command
+ * @typedef { import("./option.js").Option } Option
+ */
+
+// @ts-check
+
+// Although this is a class, methods are static in style to allow override using subclass or just functions.
+class Help {
+  constructor() {
+    this.helpWidth = undefined;
+    this.sortSubcommands = false;
+    this.sortOptions = false;
+  }
+
+  /**
+   * Get an array of the visible subcommands. Includes a placeholder for the implicit help command, if there is one.
+   *
+   * @param {Command} cmd
+   * @returns {Command[]}
+   */
+
+  visibleCommands(cmd) {
+    const visibleCommands = cmd.commands.filter(cmd => !cmd._hidden);
+    if (cmd._hasImplicitHelpCommand()) {
+      // Create a command matching the implicit help command.
+      const [, helpName, helpArgs] = cmd._helpCommandnameAndArgs.match(/([^ ]+) *(.*)/);
+      const helpCommand = cmd.createCommand(helpName)
+        .helpOption(false);
+      helpCommand.description(cmd._helpCommandDescription);
+      if (helpArgs) helpCommand.arguments(helpArgs);
+      visibleCommands.push(helpCommand);
+    }
+    if (this.sortSubcommands) {
+      visibleCommands.sort((a, b) => {
+        // @ts-ignore: overloaded return type
+        return a.name().localeCompare(b.name());
+      });
+    }
+    return visibleCommands;
+  }
+
+  /**
+   * Get an array of the visible options. Includes a placeholder for the implicit help option, if there is one.
+   *
+   * @param {Command} cmd
+   * @returns {Option[]}
+   */
+
+  visibleOptions(cmd) {
+    const visibleOptions = cmd.options.filter((option) => !option.hidden);
+    // Implicit help
+    const showShortHelpFlag = cmd._hasHelpOption && cmd._helpShortFlag && !cmd._findOption(cmd._helpShortFlag);
+    const showLongHelpFlag = cmd._hasHelpOption && !cmd._findOption(cmd._helpLongFlag);
+    if (showShortHelpFlag || showLongHelpFlag) {
+      let helpOption;
+      if (!showShortHelpFlag) {
+        helpOption = cmd.createOption(cmd._helpLongFlag, cmd._helpDescription);
+      } else if (!showLongHelpFlag) {
+        helpOption = cmd.createOption(cmd._helpShortFlag, cmd._helpDescription);
+      } else {
+        helpOption = cmd.createOption(cmd._helpFlags, cmd._helpDescription);
+      }
+      visibleOptions.push(helpOption);
+    }
+    if (this.sortOptions) {
+      const getSortKey = (option) => {
+        // WYSIWYG for order displayed in help with short before long, no special handling for negated.
+        return option.short ? option.short.replace(/^-/, '') : option.long.replace(/^--/, '');
+      };
+      visibleOptions.sort((a, b) => {
+        return getSortKey(a).localeCompare(getSortKey(b));
+      });
+    }
+    return visibleOptions;
+  }
+
+  /**
+   * Get an array of the arguments if any have a description.
+   *
+   * @param {Command} cmd
+   * @returns {Argument[]}
+   */
+
+  visibleArguments(cmd) {
+    // Side effect! Apply the legacy descriptions before the arguments are displayed.
+    if (cmd._argsDescription) {
+      cmd._args.forEach(argument => {
+        argument.description = argument.description || cmd._argsDescription[argument.name()] || '';
+      });
+    }
+
+    // If there are any arguments with a description then return all the arguments.
+    if (cmd._args.find(argument => argument.description)) {
+      return cmd._args;
+    };
+    return [];
+  }
+
+  /**
+   * Get the command term to show in the list of subcommands.
+   *
+   * @param {Command} cmd
+   * @returns {string}
+   */
+
+  subcommandTerm(cmd) {
+    // Legacy. Ignores custom usage string, and nested commands.
+    const args = cmd._args.map(arg => humanReadableArgName(arg)).join(' ');
+    return cmd._name +
+      (cmd._aliases[0] ? '|' + cmd._aliases[0] : '') +
+      (cmd.options.length ? ' [options]' : '') + // simplistic check for non-help option
+      (args ? ' ' + args : '');
+  }
+
+  /**
+   * Get the option term to show in the list of options.
+   *
+   * @param {Option} option
+   * @returns {string}
+   */
+
+  optionTerm(option) {
+    return option.flags;
+  }
+
+  /**
+   * Get the argument term to show in the list of arguments.
+   *
+   * @param {Argument} argument
+   * @returns {string}
+   */
+
+  argumentTerm(argument) {
+    return argument.name();
+  }
+
+  /**
+   * Get the longest command term length.
+   *
+   * @param {Command} cmd
+   * @param {Help} helper
+   * @returns {number}
+   */
+
+  longestSubcommandTermLength(cmd, helper) {
+    return helper.visibleCommands(cmd).reduce((max, command) => {
+      return Math.max(max, helper.subcommandTerm(command).length);
+    }, 0);
+  };
+
+  /**
+   * Get the longest option term length.
+   *
+   * @param {Command} cmd
+   * @param {Help} helper
+   * @returns {number}
+   */
+
+  longestOptionTermLength(cmd, helper) {
+    return helper.visibleOptions(cmd).reduce((max, option) => {
+      return Math.max(max, helper.optionTerm(option).length);
+    }, 0);
+  };
+
+  /**
+   * Get the longest argument term length.
+   *
+   * @param {Command} cmd
+   * @param {Help} helper
+   * @returns {number}
+   */
+
+  longestArgumentTermLength(cmd, helper) {
+    return helper.visibleArguments(cmd).reduce((max, argument) => {
+      return Math.max(max, helper.argumentTerm(argument).length);
+    }, 0);
+  };
+
+  /**
+   * Get the command usage to be displayed at the top of the built-in help.
+   *
+   * @param {Command} cmd
+   * @returns {string}
+   */
+
+  commandUsage(cmd) {
+    // Usage
+    let cmdName = cmd._name;
+    if (cmd._aliases[0]) {
+      cmdName = cmdName + '|' + cmd._aliases[0];
+    }
+    let parentCmdNames = '';
+    for (let parentCmd = cmd.parent; parentCmd; parentCmd = parentCmd.parent) {
+      parentCmdNames = parentCmd.name() + ' ' + parentCmdNames;
+    }
+    return parentCmdNames + cmdName + ' ' + cmd.usage();
+  }
+
+  /**
+   * Get the description for the command.
+   *
+   * @param {Command} cmd
+   * @returns {string}
+   */
+
+  commandDescription(cmd) {
+    // @ts-ignore: overloaded return type
+    return cmd.description();
+  }
+
+  /**
+   * Get the command description to show in the list of subcommands.
+   *
+   * @param {Command} cmd
+   * @returns {string}
+   */
+
+  subcommandDescription(cmd) {
+    // @ts-ignore: overloaded return type
+    return cmd.description();
+  }
+
+  /**
+   * Get the option description to show in the list of options.
+   *
+   * @param {Option} option
+   * @return {string}
+   */
+
+  optionDescription(option) {
+    const extraInfo = [];
+    // Some of these do not make sense for negated boolean and suppress for backwards compatibility.
+
+    if (option.argChoices && !option.negate) {
+      extraInfo.push(
+        // use stringify to match the display of the default value
+        `choices: ${option.argChoices.map((choice) => JSON.stringify(choice)).join(', ')}`);
+    }
+    if (option.defaultValue !== undefined && !option.negate) {
+      extraInfo.push(`default: ${option.defaultValueDescription || JSON.stringify(option.defaultValue)}`);
+    }
+    if (option.envVar !== undefined) {
+      extraInfo.push(`env: ${option.envVar}`);
+    }
+    if (extraInfo.length > 0) {
+      return `${option.description} (${extraInfo.join(', ')})`;
+    }
+
+    return option.description;
+  };
+
+  /**
+   * Get the argument description to show in the list of arguments.
+   *
+   * @param {Argument} argument
+   * @return {string}
+   */
+
+  argumentDescription(argument) {
+    const extraInfo = [];
+    if (argument.argChoices) {
+      extraInfo.push(
+        // use stringify to match the display of the default value
+        `choices: ${argument.argChoices.map((choice) => JSON.stringify(choice)).join(', ')}`);
+    }
+    if (argument.defaultValue !== undefined) {
+      extraInfo.push(`default: ${argument.defaultValueDescription || JSON.stringify(argument.defaultValue)}`);
+    }
+    if (extraInfo.length > 0) {
+      const extraDescripton = `(${extraInfo.join(', ')})`;
+      if (argument.description) {
+        return `${argument.description} ${extraDescripton}`;
+      }
+      return extraDescripton;
+    }
+    return argument.description;
+  }
+
+  /**
+   * Generate the built-in help text.
+   *
+   * @param {Command} cmd
+   * @param {Help} helper
+   * @returns {string}
+   */
+
+  formatHelp(cmd, helper) {
+    const termWidth = helper.padWidth(cmd, helper);
+    const helpWidth = helper.helpWidth || 80;
+    const itemIndentWidth = 2;
+    const itemSeparatorWidth = 2; // between term and description
+    function formatItem(term, description) {
+      if (description) {
+        const fullText = `${term.padEnd(termWidth + itemSeparatorWidth)}${description}`;
+        return helper.wrap(fullText, helpWidth - itemIndentWidth, termWidth + itemSeparatorWidth);
+      }
+      return term;
+    };
+    function formatList(textArray) {
+      return textArray.join('\n').replace(/^/gm, ' '.repeat(itemIndentWidth));
+    }
+
+    // Usage
+    let output = [`Usage: ${helper.commandUsage(cmd)}`, ''];
+
+    // Description
+    const commandDescription = helper.commandDescription(cmd);
+    if (commandDescription.length > 0) {
+      output = output.concat([commandDescription, '']);
+    }
+
+    // Arguments
+    const argumentList = helper.visibleArguments(cmd).map((argument) => {
+      return formatItem(helper.argumentTerm(argument), helper.argumentDescription(argument));
+    });
+    if (argumentList.length > 0) {
+      output = output.concat(['Arguments:', formatList(argumentList), '']);
+    }
+
+    // Options
+    const optionList = helper.visibleOptions(cmd).map((option) => {
+      return formatItem(helper.optionTerm(option), helper.optionDescription(option));
+    });
+    if (optionList.length > 0) {
+      output = output.concat(['Options:', formatList(optionList), '']);
+    }
+
+    // Commands
+    const commandList = helper.visibleCommands(cmd).map((cmd) => {
+      return formatItem(helper.subcommandTerm(cmd), helper.subcommandDescription(cmd));
+    });
+    if (commandList.length > 0) {
+      output = output.concat(['Commands:', formatList(commandList), '']);
+    }
+
+    return output.join('\n');
+  }
+
+  /**
+   * Calculate the pad width from the maximum term length.
+   *
+   * @param {Command} cmd
+   * @param {Help} helper
+   * @returns {number}
+   */
+
+  padWidth(cmd, helper) {
+    return Math.max(
+      helper.longestOptionTermLength(cmd, helper),
+      helper.longestSubcommandTermLength(cmd, helper),
+      helper.longestArgumentTermLength(cmd, helper)
+    );
+  };
+
+  /**
+   * Wrap the given string to width characters per line, with lines after the first indented.
+   * Do not wrap if insufficient room for wrapping (minColumnWidth), or string is manually formatted.
+   *
+   * @param {string} str
+   * @param {number} width
+   * @param {number} indent
+   * @param {number} [minColumnWidth=40]
+   * @return {string}
+   *
+   */
+
+  wrap(str, width, indent, minColumnWidth = 40) {
+    // Detect manually wrapped and indented strings by searching for line breaks
+    // followed by multiple spaces/tabs.
+    if (str.match(/[\n]\s+/)) return str;
+    // Do not wrap if not enough room for a wrapped column of text (as could end up with a word per line).
+    const columnWidth = width - indent;
+    if (columnWidth < minColumnWidth) return str;
+
+    const leadingStr = str.substr(0, indent);
+    const columnText = str.substr(indent);
+
+    const indentString = ' '.repeat(indent);
+    const regex = new RegExp('.{1,' + (columnWidth - 1) + '}([\\s\u200B]|$)|[^\\s\u200B]+?([\\s\u200B]|$)', 'g');
+    const lines = columnText.match(regex) || [];
+    return leadingStr + lines.map((line, i) => {
+      if (line.slice(-1) === '\n') {
+        line = line.slice(0, line.length - 1);
+      }
+      return ((i > 0) ? indentString : '') + line.trimRight();
+    }).join('\n');
+  }
+}
+
+exports.Help = Help;

app_vue/node_modules/commander/lib/option.js

@@ -0,0 +1,208 @@
+const { InvalidArgumentError } = require('./error.js');
+
+// @ts-check
+
+class Option {
+  /**
+   * Initialize a new `Option` with the given `flags` and `description`.
+   *
+   * @param {string} flags
+   * @param {string} [description]
+   */
+
+  constructor(flags, description) {
+    this.flags = flags;
+    this.description = description || '';
+
+    this.required = flags.includes('<'); // A value must be supplied when the option is specified.
+    this.optional = flags.includes('['); // A value is optional when the option is specified.
+    // variadic test ignores <value,...> et al which might be used to describe custom splitting of single argument
+    this.variadic = /\w\.\.\.[>\]]$/.test(flags); // The option can take multiple values.
+    this.mandatory = false; // The option must have a value after parsing, which usually means it must be specified on command line.
+    const optionFlags = splitOptionFlags(flags);
+    this.short = optionFlags.shortFlag;
+    this.long = optionFlags.longFlag;
+    this.negate = false;
+    if (this.long) {
+      this.negate = this.long.startsWith('--no-');
+    }
+    this.defaultValue = undefined;
+    this.defaultValueDescription = undefined;
+    this.envVar = undefined;
+    this.parseArg = undefined;
+    this.hidden = false;
+    this.argChoices = undefined;
+  }
+
+  /**
+   * Set the default value, and optionally supply the description to be displayed in the help.
+   *
+   * @param {any} value
+   * @param {string} [description]
+   * @return {Option}
+   */
+
+  default(value, description) {
+    this.defaultValue = value;
+    this.defaultValueDescription = description;
+    return this;
+  };
+
+  /**
+   * Set environment variable to check for option value.
+   * Priority order of option values is default < env < cli
+   *
+   * @param {string} name
+   * @return {Option}
+   */
+
+  env(name) {
+    this.envVar = name;
+    return this;
+  };
+
+  /**
+   * Set the custom handler for processing CLI option arguments into option values.
+   *
+   * @param {Function} [fn]
+   * @return {Option}
+   */
+
+  argParser(fn) {
+    this.parseArg = fn;
+    return this;
+  };
+
+  /**
+   * Whether the option is mandatory and must have a value after parsing.
+   *
+   * @param {boolean} [mandatory=true]
+   * @return {Option}
+   */
+
+  makeOptionMandatory(mandatory = true) {
+    this.mandatory = !!mandatory;
+    return this;
+  };
+
+  /**
+   * Hide option in help.
+   *
+   * @param {boolean} [hide=true]
+   * @return {Option}
+   */
+
+  hideHelp(hide = true) {
+    this.hidden = !!hide;
+    return this;
+  };
+
+  /**
+   * @api private
+   */
+
+  _concatValue(value, previous) {
+    if (previous === this.defaultValue || !Array.isArray(previous)) {
+      return [value];
+    }
+
+    return previous.concat(value);
+  }
+
+  /**
+   * Only allow option value to be one of choices.
+   *
+   * @param {string[]} values
+   * @return {Option}
+   */
+
+  choices(values) {
+    this.argChoices = values;
+    this.parseArg = (arg, previous) => {
+      if (!values.includes(arg)) {
+        throw new InvalidArgumentError(`Allowed choices are ${values.join(', ')}.`);
+      }
+      if (this.variadic) {
+        return this._concatValue(arg, previous);
+      }
+      return arg;
+    };
+    return this;
+  };
+
+  /**
+   * Return option name.
+   *
+   * @return {string}
+   */
+
+  name() {
+    if (this.long) {
+      return this.long.replace(/^--/, '');
+    }
+    return this.short.replace(/^-/, '');
+  };
+
+  /**
+   * Return option name, in a camelcase format that can be used
+   * as a object attribute key.
+   *
+   * @return {string}
+   * @api private
+   */
+
+  attributeName() {
+    return camelcase(this.name().replace(/^no-/, ''));
+  };
+
+  /**
+   * Check if `arg` matches the short or long flag.
+   *
+   * @param {string} arg
+   * @return {boolean}
+   * @api private
+   */
+
+  is(arg) {
+    return this.short === arg || this.long === arg;
+  };
+}
+
+/**
+ * Convert string from kebab-case to camelCase.
+ *
+ * @param {string} str
+ * @return {string}
+ * @api private
+ */
+
+function camelcase(str) {
+  return str.split('-').reduce((str, word) => {
+    return str + word[0].toUpperCase() + word.slice(1);
+  });
+}
+
+/**
+ * Split the short and long flag out of something like '-m,--mixed <value>'
+ *
+ * @api private
+ */
+
+function splitOptionFlags(flags) {
+  let shortFlag;
+  let longFlag;
+  // Use original very loose parsing to maintain backwards compatibility for now,
+  // which allowed for example unintended `-sw, --short-word` [sic].
+  const flagParts = flags.split(/[ |,]+/);
+  if (flagParts.length > 1 && !/^[[<]/.test(flagParts[1])) shortFlag = flagParts.shift();
+  longFlag = flagParts.shift();
+  // Add support for lone short flag without significantly changing parsing!
+  if (!shortFlag && /^-[^-]$/.test(longFlag)) {
+    shortFlag = longFlag;
+    longFlag = undefined;
+  }
+  return { shortFlag, longFlag };
+}
+
+exports.Option = Option;
+exports.splitOptionFlags = splitOptionFlags;

app_vue/node_modules/commander/lib/suggestSimilar.js

@@ -0,0 +1,100 @@
+const maxDistance = 3;
+
+function editDistance(a, b) {
+  // https://en.wikipedia.org/wiki/Damerau–Levenshtein_distance
+  // Calculating optimal string alignment distance, no substring is edited more than once.
+  // (Simple implementation.)
+
+  // Quick early exit, return worst case.
+  if (Math.abs(a.length - b.length) > maxDistance) return Math.max(a.length, b.length);
+
+  // distance between prefix substrings of a and b
+  const d = [];
+
+  // pure deletions turn a into empty string
+  for (let i = 0; i <= a.length; i++) {
+    d[i] = [i];
+  }
+  // pure insertions turn empty string into b
+  for (let j = 0; j <= b.length; j++) {
+    d[0][j] = j;
+  }
+
+  // fill matrix
+  for (let j = 1; j <= b.length; j++) {
+    for (let i = 1; i <= a.length; i++) {
+      let cost = 1;
+      if (a[i - 1] === b[j - 1]) {
+        cost = 0;
+      } else {
+        cost = 1;
+      }
+      d[i][j] = Math.min(
+        d[i - 1][j] + 1, // deletion
+        d[i][j - 1] + 1, // insertion
+        d[i - 1][j - 1] + cost // substitution
+      );
+      // transposition
+      if (i > 1 && j > 1 && a[i - 1] === b[j - 2] && a[i - 2] === b[j - 1]) {
+        d[i][j] = Math.min(d[i][j], d[i - 2][j - 2] + 1);
+      }
+    }
+  }
+
+  return d[a.length][b.length];
+}
+
+/**
+ * Find close matches, restricted to same number of edits.
+ *
+ * @param {string} word
+ * @param {string[]} candidates
+ * @returns {string}
+ */
+
+function suggestSimilar(word, candidates) {
+  if (!candidates || candidates.length === 0) return '';
+  // remove possible duplicates
+  candidates = Array.from(new Set(candidates));
+
+  const searchingOptions = word.startsWith('--');
+  if (searchingOptions) {
+    word = word.slice(2);
+    candidates = candidates.map(candidate => candidate.slice(2));
+  }
+
+  let similar = [];
+  let bestDistance = maxDistance;
+  const minSimilarity = 0.4;
+  candidates.forEach((candidate) => {
+    if (candidate.length <= 1) return; // no one character guesses
+
+    const distance = editDistance(word, candidate);
+    const length = Math.max(word.length, candidate.length);
+    const similarity = (length - distance) / length;
+    if (similarity > minSimilarity) {
+      if (distance < bestDistance) {
+        // better edit distance, throw away previous worse matches
+        bestDistance = distance;
+        similar = [candidate];
+      } else if (distance === bestDistance) {
+        similar.push(candidate);
+      }
+    }
+  });
+
+  similar.sort((a, b) => a.localeCompare(b));
+  if (searchingOptions) {
+    similar = similar.map(candidate => `--${candidate}`);
+  }
+
+  if (similar.length > 1) {
+    return `\n(Did you mean one of ${similar.join(', ')}?)`;
+  }
+  if (similar.length === 1) {
+    return `\n(Did you mean ${similar[0]}?)`;
+  }
+  return '';
+}
+
+exports.suggestSimilar = suggestSimilar;