add hw2

node_modules/commander/lib/help.js

@@ -0,0 +1,747 @@
+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
+ */
+
+// 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.minWidthToWrap = 40;
+    this.sortSubcommands = false;
+    this.sortOptions = false;
+    this.showGlobalOptions = false;
+  }
+
+  /**
+   * prepareContext is called by Commander after applying overrides from `Command.configureHelp()`
+   * and just before calling `formatHelp()`.
+   *
+   * Commander just uses the helpWidth and the rest is provided for optional use by more complex subclasses.
+   *
+   * @param {{ error?: boolean, helpWidth?: number, outputHasColors?: boolean }} contextOptions
+   */
+  prepareContext(contextOptions) {
+    this.helpWidth = this.helpWidth ?? contextOptions.helpWidth ?? 80;
+  }
+
+  /**
+   * 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);
+    const helpCommand = cmd._getHelpCommand();
+    if (helpCommand && !helpCommand._hidden) {
+      visibleCommands.push(helpCommand);
+    }
+    if (this.sortSubcommands) {
+      visibleCommands.sort((a, b) => {
+        // @ts-ignore: because overloaded return type
+        return a.name().localeCompare(b.name());
+      });
+    }
+    return visibleCommands;
+  }
+
+  /**
+   * Compare options for sort.
+   *
+   * @param {Option} a
+   * @param {Option} b
+   * @returns {number}
+   */
+  compareOptions(a, b) {
+    const getSortKey = (option) => {
+      // WYSIWYG for order displayed in help. Short used for comparison if present. No special handling for negated.
+      return option.short
+        ? option.short.replace(/^-/, '')
+        : option.long.replace(/^--/, '');
+    };
+    return getSortKey(a).localeCompare(getSortKey(b));
+  }
+
+  /**
+   * 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);
+    // Built-in help option.
+    const helpOption = cmd._getHelpOption();
+    if (helpOption && !helpOption.hidden) {
+      // Automatically hide conflicting flags. Bit dubious but a historical behaviour that is convenient for single-command programs.
+      const removeShort = helpOption.short && cmd._findOption(helpOption.short);
+      const removeLong = helpOption.long && cmd._findOption(helpOption.long);
+      if (!removeShort && !removeLong) {
+        visibleOptions.push(helpOption); // no changes needed
+      } else if (helpOption.long && !removeLong) {
+        visibleOptions.push(
+          cmd.createOption(helpOption.long, helpOption.description),
+        );
+      } else if (helpOption.short && !removeShort) {
+        visibleOptions.push(
+          cmd.createOption(helpOption.short, helpOption.description),
+        );
+      }
+    }
+    if (this.sortOptions) {
+      visibleOptions.sort(this.compareOptions);
+    }
+    return visibleOptions;
+  }
+
+  /**
+   * Get an array of the visible global options. (Not including help.)
+   *
+   * @param {Command} cmd
+   * @returns {Option[]}
+   */
+
+  visibleGlobalOptions(cmd) {
+    if (!this.showGlobalOptions) return [];
+
+    const globalOptions = [];
+    for (
+      let ancestorCmd = cmd.parent;
+      ancestorCmd;
+      ancestorCmd = ancestorCmd.parent
+    ) {
+      const visibleOptions = ancestorCmd.options.filter(
+        (option) => !option.hidden,
+      );
+      globalOptions.push(...visibleOptions);
+    }
+    if (this.sortOptions) {
+      globalOptions.sort(this.compareOptions);
+    }
+    return globalOptions;
+  }
+
+  /**
+   * 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.registeredArguments.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.registeredArguments.find((argument) => argument.description)) {
+      return cmd.registeredArguments;
+    }
+    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.registeredArguments
+      .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,
+        this.displayWidth(
+          helper.styleSubcommandTerm(helper.subcommandTerm(command)),
+        ),
+      );
+    }, 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,
+        this.displayWidth(helper.styleOptionTerm(helper.optionTerm(option))),
+      );
+    }, 0);
+  }
+
+  /**
+   * Get the longest global option term length.
+   *
+   * @param {Command} cmd
+   * @param {Help} helper
+   * @returns {number}
+   */
+
+  longestGlobalOptionTermLength(cmd, helper) {
+    return helper.visibleGlobalOptions(cmd).reduce((max, option) => {
+      return Math.max(
+        max,
+        this.displayWidth(helper.styleOptionTerm(helper.optionTerm(option))),
+      );
+    }, 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,
+        this.displayWidth(
+          helper.styleArgumentTerm(helper.argumentTerm(argument)),
+        ),
+      );
+    }, 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 ancestorCmdNames = '';
+    for (
+      let ancestorCmd = cmd.parent;
+      ancestorCmd;
+      ancestorCmd = ancestorCmd.parent
+    ) {
+      ancestorCmdNames = ancestorCmd.name() + ' ' + ancestorCmdNames;
+    }
+    return ancestorCmdNames + cmdName + ' ' + cmd.usage();
+  }
+
+  /**
+   * Get the description for the command.
+   *
+   * @param {Command} cmd
+   * @returns {string}
+   */
+
+  commandDescription(cmd) {
+    // @ts-ignore: because overloaded return type
+    return cmd.description();
+  }
+
+  /**
+   * Get the subcommand summary to show in the list of subcommands.
+   * (Fallback to description for backwards compatibility.)
+   *
+   * @param {Command} cmd
+   * @returns {string}
+   */
+
+  subcommandDescription(cmd) {
+    // @ts-ignore: because overloaded return type
+    return cmd.summary() || cmd.description();
+  }
+
+  /**
+   * Get the option description to show in the list of options.
+   *
+   * @param {Option} option
+   * @return {string}
+   */
+
+  optionDescription(option) {
+    const extraInfo = [];
+
+    if (option.argChoices) {
+      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) {
+      // default for boolean and negated more for programmer than end user,
+      // but show true/false for boolean option as may be for hand-rolled env or config processing.
+      const showDefault =
+        option.required ||
+        option.optional ||
+        (option.isBoolean() && typeof option.defaultValue === 'boolean');
+      if (showDefault) {
+        extraInfo.push(
+          `default: ${option.defaultValueDescription || JSON.stringify(option.defaultValue)}`,
+        );
+      }
+    }
+    // preset for boolean and negated are more for programmer than end user
+    if (option.presetArg !== undefined && option.optional) {
+      extraInfo.push(`preset: ${JSON.stringify(option.presetArg)}`);
+    }
+    if (option.envVar !== undefined) {
+      extraInfo.push(`env: ${option.envVar}`);
+    }
+    if (extraInfo.length > 0) {
+      const extraDescription = `(${extraInfo.join(', ')})`;
+      if (option.description) {
+        return `${option.description} ${extraDescription}`;
+      }
+      return extraDescription;
+    }
+
+    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: ${argument.defaultValueDescription || JSON.stringify(argument.defaultValue)}`,
+      );
+    }
+    if (extraInfo.length > 0) {
+      const extraDescription = `(${extraInfo.join(', ')})`;
+      if (argument.description) {
+        return `${argument.description} ${extraDescription}`;
+      }
+      return extraDescription;
+    }
+    return argument.description;
+  }
+
+  /**
+   * Format a list of items, given a heading and an array of formatted items.
+   *
+   * @param {string} heading
+   * @param {string[]} items
+   * @param {Help} helper
+   * @returns string[]
+   */
+  formatItemList(heading, items, helper) {
+    if (items.length === 0) return [];
+
+    return [helper.styleTitle(heading), ...items, ''];
+  }
+
+  /**
+   * Group items by their help group heading.
+   *
+   * @param {Command[] | Option[]} unsortedItems
+   * @param {Command[] | Option[]} visibleItems
+   * @param {Function} getGroup
+   * @returns {Map<string, Command[] | Option[]>}
+   */
+  groupItems(unsortedItems, visibleItems, getGroup) {
+    const result = new Map();
+    // Add groups in order of appearance in unsortedItems.
+    unsortedItems.forEach((item) => {
+      const group = getGroup(item);
+      if (!result.has(group)) result.set(group, []);
+    });
+    // Add items in order of appearance in visibleItems.
+    visibleItems.forEach((item) => {
+      const group = getGroup(item);
+      if (!result.has(group)) {
+        result.set(group, []);
+      }
+      result.get(group).push(item);
+    });
+    return result;
+  }
+
+  /**
+   * Generate the built-in help text.
+   *
+   * @param {Command} cmd
+   * @param {Help} helper
+   * @returns {string}
+   */
+
+  formatHelp(cmd, helper) {
+    const termWidth = helper.padWidth(cmd, helper);
+    const helpWidth = helper.helpWidth ?? 80; // in case prepareContext() was not called
+
+    function callFormatItem(term, description) {
+      return helper.formatItem(term, termWidth, description, helper);
+    }
+
+    // Usage
+    let output = [
+      `${helper.styleTitle('Usage:')} ${helper.styleUsage(helper.commandUsage(cmd))}`,
+      '',
+    ];
+
+    // Description
+    const commandDescription = helper.commandDescription(cmd);
+    if (commandDescription.length > 0) {
+      output = output.concat([
+        helper.boxWrap(
+          helper.styleCommandDescription(commandDescription),
+          helpWidth,
+        ),
+        '',
+      ]);
+    }
+
+    // Arguments
+    const argumentList = helper.visibleArguments(cmd).map((argument) => {
+      return callFormatItem(
+        helper.styleArgumentTerm(helper.argumentTerm(argument)),
+        helper.styleArgumentDescription(helper.argumentDescription(argument)),
+      );
+    });
+    output = output.concat(
+      this.formatItemList('Arguments:', argumentList, helper),
+    );
+
+    // Options
+    const optionGroups = this.groupItems(
+      cmd.options,
+      helper.visibleOptions(cmd),
+      (option) => option.helpGroupHeading ?? 'Options:',
+    );
+    optionGroups.forEach((options, group) => {
+      const optionList = options.map((option) => {
+        return callFormatItem(
+          helper.styleOptionTerm(helper.optionTerm(option)),
+          helper.styleOptionDescription(helper.optionDescription(option)),
+        );
+      });
+      output = output.concat(this.formatItemList(group, optionList, helper));
+    });
+
+    if (helper.showGlobalOptions) {
+      const globalOptionList = helper
+        .visibleGlobalOptions(cmd)
+        .map((option) => {
+          return callFormatItem(
+            helper.styleOptionTerm(helper.optionTerm(option)),
+            helper.styleOptionDescription(helper.optionDescription(option)),
+          );
+        });
+      output = output.concat(
+        this.formatItemList('Global Options:', globalOptionList, helper),
+      );
+    }
+
+    // Commands
+    const commandGroups = this.groupItems(
+      cmd.commands,
+      helper.visibleCommands(cmd),
+      (sub) => sub.helpGroup() || 'Commands:',
+    );
+    commandGroups.forEach((commands, group) => {
+      const commandList = commands.map((sub) => {
+        return callFormatItem(
+          helper.styleSubcommandTerm(helper.subcommandTerm(sub)),
+          helper.styleSubcommandDescription(helper.subcommandDescription(sub)),
+        );
+      });
+      output = output.concat(this.formatItemList(group, commandList, helper));
+    });
+
+    return output.join('\n');
+  }
+
+  /**
+   * Return display width of string, ignoring ANSI escape sequences. Used in padding and wrapping calculations.
+   *
+   * @param {string} str
+   * @returns {number}
+   */
+  displayWidth(str) {
+    return stripColor(str).length;
+  }
+
+  /**
+   * Style the title for displaying in the help. Called with 'Usage:', 'Options:', etc.
+   *
+   * @param {string} str
+   * @returns {string}
+   */
+  styleTitle(str) {
+    return str;
+  }
+
+  styleUsage(str) {
+    // Usage has lots of parts the user might like to color separately! Assume default usage string which is formed like:
+    //    command subcommand [options] [command] <foo> [bar]
+    return str
+      .split(' ')
+      .map((word) => {
+        if (word === '[options]') return this.styleOptionText(word);
+        if (word === '[command]') return this.styleSubcommandText(word);
+        if (word[0] === '[' || word[0] === '<')
+          return this.styleArgumentText(word);
+        return this.styleCommandText(word); // Restrict to initial words?
+      })
+      .join(' ');
+  }
+  styleCommandDescription(str) {
+    return this.styleDescriptionText(str);
+  }
+  styleOptionDescription(str) {
+    return this.styleDescriptionText(str);
+  }
+  styleSubcommandDescription(str) {
+    return this.styleDescriptionText(str);
+  }
+  styleArgumentDescription(str) {
+    return this.styleDescriptionText(str);
+  }
+  styleDescriptionText(str) {
+    return str;
+  }
+  styleOptionTerm(str) {
+    return this.styleOptionText(str);
+  }
+  styleSubcommandTerm(str) {
+    // This is very like usage with lots of parts! Assume default string which is formed like:
+    //    subcommand [options] <foo> [bar]
+    return str
+      .split(' ')
+      .map((word) => {
+        if (word === '[options]') return this.styleOptionText(word);
+        if (word[0] === '[' || word[0] === '<')
+          return this.styleArgumentText(word);
+        return this.styleSubcommandText(word); // Restrict to initial words?
+      })
+      .join(' ');
+  }
+  styleArgumentTerm(str) {
+    return this.styleArgumentText(str);
+  }
+  styleOptionText(str) {
+    return str;
+  }
+  styleArgumentText(str) {
+    return str;
+  }
+  styleSubcommandText(str) {
+    return str;
+  }
+  styleCommandText(str) {
+    return str;
+  }
+
+  /**
+   * 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.longestGlobalOptionTermLength(cmd, helper),
+      helper.longestSubcommandTermLength(cmd, helper),
+      helper.longestArgumentTermLength(cmd, helper),
+    );
+  }
+
+  /**
+   * Detect manually wrapped and indented strings by checking for line break followed by whitespace.
+   *
+   * @param {string} str
+   * @returns {boolean}
+   */
+  preformatted(str) {
+    return /\n[^\S\r\n]/.test(str);
+  }
+
+  /**
+   * Format the "item", which consists of a term and description. Pad the term and wrap the description, indenting the following lines.
+   *
+   * So "TTT", 5, "DDD DDDD DD DDD" might be formatted for this.helpWidth=17 like so:
+   *   TTT  DDD DDDD
+   *        DD DDD
+   *
+   * @param {string} term
+   * @param {number} termWidth
+   * @param {string} description
+   * @param {Help} helper
+   * @returns {string}
+   */
+  formatItem(term, termWidth, description, helper) {
+    const itemIndent = 2;
+    const itemIndentStr = ' '.repeat(itemIndent);
+    if (!description) return itemIndentStr + term;
+
+    // Pad the term out to a consistent width, so descriptions are aligned.
+    const paddedTerm = term.padEnd(
+      termWidth + term.length - helper.displayWidth(term),
+    );
+
+    // Format the description.
+    const spacerWidth = 2; // between term and description
+    const helpWidth = this.helpWidth ?? 80; // in case prepareContext() was not called
+    const remainingWidth = helpWidth - termWidth - spacerWidth - itemIndent;
+    let formattedDescription;
+    if (
+      remainingWidth < this.minWidthToWrap ||
+      helper.preformatted(description)
+    ) {
+      formattedDescription = description;
+    } else {
+      const wrappedDescription = helper.boxWrap(description, remainingWidth);
+      formattedDescription = wrappedDescription.replace(
+        /\n/g,
+        '\n' + ' '.repeat(termWidth + spacerWidth),
+      );
+    }
+
+    // Construct and overall indent.
+    return (
+      itemIndentStr +
+      paddedTerm +
+      ' '.repeat(spacerWidth) +
+      formattedDescription.replace(/\n/g, `\n${itemIndentStr}`)
+    );
+  }
+
+  /**
+   * Wrap a string at whitespace, preserving existing line breaks.
+   * Wrapping is skipped if the width is less than `minWidthToWrap`.
+   *
+   * @param {string} str
+   * @param {number} width
+   * @returns {string}
+   */
+  boxWrap(str, width) {
+    if (width < this.minWidthToWrap) return str;
+
+    const rawLines = str.split(/\r\n|\n/);
+    // split up text by whitespace
+    const chunkPattern = /[\s]*[^\s]+/g;
+    const wrappedLines = [];
+    rawLines.forEach((line) => {
+      const chunks = line.match(chunkPattern);
+      if (chunks === null) {
+        wrappedLines.push('');
+        return;
+      }
+
+      let sumChunks = [chunks.shift()];
+      let sumWidth = this.displayWidth(sumChunks[0]);
+      chunks.forEach((chunk) => {
+        const visibleWidth = this.displayWidth(chunk);
+        // Accumulate chunks while they fit into width.
+        if (sumWidth + visibleWidth <= width) {
+          sumChunks.push(chunk);
+          sumWidth += visibleWidth;
+          return;
+        }
+        wrappedLines.push(sumChunks.join(''));
+
+        const nextChunk = chunk.trimStart(); // trim space at line break
+        sumChunks = [nextChunk];
+        sumWidth = this.displayWidth(nextChunk);
+      });
+      wrappedLines.push(sumChunks.join(''));
+    });
+
+    return wrappedLines.join('\n');
+  }
+}
+
+/**
+ * Strip style ANSI escape sequences from the string. In particular, SGR (Select Graphic Rendition) codes.
+ *
+ * @param {string} str
+ * @returns {string}
+ * @package
+ */
+
+function stripColor(str) {
+  // eslint-disable-next-line no-control-regex
+  const sgrPattern = /\x1b\[\d*(;\d*)*m/g;
+  return str.replace(sgrPattern, '');
+}
+
+exports.Help = Help;
+exports.stripColor = stripColor;