1 | import * as mri from 'mri';
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2 | import * as os from 'os';
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3 | import { getCommandDefinitionParameterValue, validateCommandDefinitionParameterValue } from './parameters';
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4 | import { ParserErrors } from './ParserErrors';
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5 | import { CliProgram } from './program';
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6 | import { CliPromptHandler, CliPromptResult } from './prompt';
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7 | import {
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8 | CliCommandDefinition,
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9 | CliCommandDefinitionArgument,
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10 | CliCommandDefinitionOption,
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11 | CliCommandDefinitionParameter,
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12 | CliParsedCommandDefinitionArgument,
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13 | CliParsedCommandDefinitionOption,
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14 | CliParsedCommandHandler,
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15 | CliProgramDefinition,
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16 | CliRunResult,
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17 | CliValue,
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18 | CliValueValidatorFunction,
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19 | ParsedCliCommand,
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20 | ParserErrorType,
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21 | } from './types';
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22 | import { dashCase, getOptionsMriOpts, isFunction, passedOptionsToNames } from './utils';
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23 |
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24 | export class Parser {
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25 | private _parsedCommand: Partial<ParsedCliCommand>;
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26 | private _definitionsMap: Map<string, CliCommandDefinition> = new Map();
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27 | private _argVals: string[] = [];
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28 | private _optionVals: { [name: string]: CliValue } = {};
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29 | private _definitionOptions: CliCommandDefinitionOption[];
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30 | private _commandPackage: CliProgram;
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31 | private _passedOptions: string[] = [];
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32 | private _parserErrors = new ParserErrors();
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33 |
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34 | constructor(
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35 | private argv: string[] = process.argv,
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36 | commandPackageDefinition: CliProgramDefinition,
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37 | private runHandler: CliParsedCommandHandler,
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38 | private errorHandler: CliParsedCommandHandler,
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39 | private promptHandler: CliPromptHandler,
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40 | private version: string | undefined,
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41 | private internalOptions: CliCommandDefinitionOption[] = [],
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42 | private showPrompts = false
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43 | ) {
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44 | this._commandPackage = CliProgram.create(commandPackageDefinition, internalOptions);
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45 | if (this._commandPackage.validationErrors.length > 0) {
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46 | throw new Error(`Invalid Command Definition: ${this._commandPackage.validationErrors.join(os.EOL)}`);
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47 | }
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48 | this._definitionsMap = this._commandPackage.commandsMap;
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49 | }
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50 |
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51 | private findCommandDefinition = (name: string): CliCommandDefinition => {
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52 | let cmdDef = this._definitionsMap.get(name);
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53 | if (!cmdDef) {
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54 |
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55 | const cmdDefs = Array.from(this._definitionsMap.values());
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56 | cmdDef = cmdDefs.find(
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57 | d =>
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58 | dashCase(d.name).toLowerCase() === name.toLowerCase() || d.name.toLowerCase() === name.toLowerCase()
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59 | );
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60 | }
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61 | return cmdDef;
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62 | };
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63 |
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64 | private parseCommandLine = () => {
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65 | let offset = 2;
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66 |
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67 |
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68 | this._definitionOptions = this.internalOptions.concat(this._commandPackage.options || []);
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69 |
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70 | let parsedMri = mri(this.argv.slice(offset), getOptionsMriOpts(this._definitionOptions));
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71 |
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72 |
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73 | let tryName: string;
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74 | let name = '';
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75 | let i = 1;
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76 | const len = parsedMri._.length + 1;
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77 | for (; i < len; i++) {
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78 | tryName = parsedMri._.slice(0, i).join(' ');
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79 |
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80 | if (this.findCommandDefinition(tryName)) {
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81 | name = tryName;
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82 | offset = i + 2;
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83 | }
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84 | }
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85 |
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86 | let cmdDef = this.findCommandDefinition(name);
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87 |
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88 | if (!cmdDef) {
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89 | if (name) {
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90 | this.pushError('command', `Unknown Command: '${name}'`);
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91 | } else if (this._commandPackage.defaultCommandName) {
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92 | cmdDef = this._definitionsMap.get(this._commandPackage.defaultCommandName);
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93 | } else if (this._commandPackage.commands.length > 0) {
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94 | this.pushError('command', `No Command Specified`);
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95 | }
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96 | }
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97 |
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98 |
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99 | const rawPassedOptions = Object.keys(parsedMri).filter(v => v !== '_');
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100 |
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101 |
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102 | if (cmdDef) {
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103 | this._definitionOptions.push(...(cmdDef.options || []));
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104 | parsedMri = mri(this.argv.slice(offset), getOptionsMriOpts(this._definitionOptions));
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105 | this._argVals = parsedMri._;
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106 | this._parsedCommand.command = cmdDef;
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107 | this._parsedCommand.parsedCommandName = name;
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108 | }
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109 |
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110 | this._passedOptions = passedOptionsToNames(rawPassedOptions, this._definitionOptions);
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111 |
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112 |
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113 | this._optionVals = Object.keys(parsedMri)
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114 | .filter(v => v !== '_')
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115 | .reduce((prev, curr) => {
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116 | prev[curr] = parsedMri[curr];
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117 | return prev;
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118 | }, {});
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119 |
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120 |
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121 | this._parsedCommand.optionDefinitions = this._definitionOptions.reduce((prev, curr) => {
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122 | prev[curr.name] = curr;
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123 | return prev;
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124 | }, {});
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125 | };
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126 |
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127 | private parseArgs = () => {
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128 | const cmd = this.parsedCommand.command;
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129 | const defArgs = cmd ? cmd.arguments || [] : [];
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130 | const requiredDefArgs = defArgs.filter(a => !a.isOptional);
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131 | const isVariadic = defArgs.length > 0 && defArgs[defArgs.length - 1].isVariadic;
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132 |
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133 |
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134 | if (this._argVals.length > defArgs.length && !isVariadic) {
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135 | this.pushError('argument', `Too many Arguments`);
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136 | }
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137 |
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138 |
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139 | if (this._argVals.length < requiredDefArgs.length) {
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140 |
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141 | if (!this.getParsedOptionCommandName()) {
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142 | this.pushError('argument', `Insufficient arguments`);
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143 | }
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144 | }
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145 |
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146 | const parsedArgs: { [name: string]: CliParsedCommandDefinitionArgument } = {};
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147 | const validateArg = (val: CliValue, arg: CliCommandDefinitionArgument) => {
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148 | const validation = validateCommandDefinitionParameterValue(val, arg);
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149 | if (validation !== true) {
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150 | const msg = typeof validation === 'string' ? validation : undefined;
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151 | this.pushError('argument', `Value for argument '${arg.name}' is invalid${msg ? `: ${msg}` : ''}`);
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152 | }
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153 | };
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154 | let argValIndex = 0;
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155 | // Loop through definition arguments, and assign each prop in definition to args value array
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156 | for (let i = 0; i < defArgs.length; i++) {
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157 | const defArg = defArgs[i];
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158 | if (defArg.isVariadic) {
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159 | // variadic arg, must be last arg, assign remainder of command line
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160 | const vals = this._argVals.slice(argValIndex).map(a => getCommandDefinitionParameterValue(a, defArg));
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161 | // validate each value
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162 | vals.forEach(v => validateArg(v, defArg));
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163 | parsedArgs[defArg.name] = {
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164 | ...defArg,
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165 | wasPassed: true,
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166 | value: vals,
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167 | };
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168 | argValIndex = this._argVals.length;
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169 | } else if (this._argVals.length > argValIndex) {
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170 | // still arguments from command line, assign next arg to args arry
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171 | // assign value from command line to args array
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172 | const val = getCommandDefinitionParameterValue(this._argVals[argValIndex], defArg);
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173 | // validate
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174 | validateArg(val, defArg);
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175 | parsedArgs[defArg.name] = {
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176 | ...defArg,
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177 | wasPassed: true,
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178 | value: val,
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179 | };
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180 | argValIndex++;
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181 | } else {
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182 | // no more arguments on command line, assign default
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183 | parsedArgs[defArg.name] = {
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184 | ...defArg,
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185 | wasPassed: false,
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186 | value: getCommandDefinitionParameterValue(undefined, defArg, false),
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187 | };
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188 | argValIndex++;
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189 | }
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190 | }
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191 |
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192 | // create args hash with just values
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193 | const args = Object.keys(parsedArgs).reduce((prev, curr) => {
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194 | prev[curr] = parsedArgs[curr].value;
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195 | return prev;
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196 | }, {});
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197 |
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198 | const transformedArgs = isFunction(cmd.transformArguments) ? cmd.transformArguments(args) : args;
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199 |
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200 | // re-assign parsed arg value from transformed args (transform could add or remove entries, so not necessarily 1:1)
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201 | Object.keys(transformedArgs).forEach(ta => {
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202 | if (parsedArgs[ta]) {
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203 | parsedArgs[ta].value = transformedArgs[ta];
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204 | }
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205 | });
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206 |
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207 | this.parsedCommand.parsedArguments = parsedArgs;
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208 | this.parsedCommand.arguments = transformedArgs;
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209 | };
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210 |
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211 | private parseOptions = () => {
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212 | const cmd = this._parsedCommand.command;
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213 | Object.keys(this._optionVals).forEach(o => {
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214 | if (!this._definitionOptions.find(co => co.name === o || co.flag === o || dashCase(co.name) === o)) {
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215 | this.pushError('option', `Invalid Option: ${o}`);
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216 | }
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217 | });
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218 |
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219 | const parsedOptions: { [name: string]: CliParsedCommandDefinitionOption } = {};
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220 |
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221 | this._definitionOptions.forEach(o => {
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222 | const wasPassed = this._passedOptions.indexOf(o.name) >= 0;
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223 | parsedOptions[o.name] = {
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224 | ...o,
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225 | wasPassed,
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226 | value: getCommandDefinitionParameterValue(this._optionVals[o.name], o, wasPassed),
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227 | };
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228 | if (wasPassed) {
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229 | // if option set on command line, and not a boolean option, make sure there is a value
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230 | if (o.valueType && o.valueType !== 'boolean' && !parsedOptions[o.name].value) {
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231 | this.pushError('option', `Value for option '${o.name}' not specified`);
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232 | } else {
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233 | const validation = validateCommandDefinitionParameterValue(parsedOptions[o.name].value, o);
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234 | if (validation !== true) {
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235 | const msg = typeof validation === 'string' ? validation : undefined;
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236 | this.pushError('option', `Value for option '${o.name}' is invalid${msg ? `: ${msg}` : ''}`);
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237 | }
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238 | }
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239 | }
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240 | });
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241 |
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242 | // create args hash with just values
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243 | const options = Object.keys(parsedOptions).reduce((prev, curr) => {
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244 | prev[curr] = parsedOptions[curr].value;
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245 | return prev;
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246 | }, {});
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247 |
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248 | const transformedOptions = cmd
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249 | ? isFunction(cmd.transformOptions)
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250 | ? cmd.transformOptions(options)
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251 | : options
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252 | : options;
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253 |
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254 | // re-assign parsed option value from transformed options (transform could add or remove entries, so not necessarily 1:1)
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255 | Object.keys(transformedOptions).forEach(to => {
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256 | if (parsedOptions[to]) {
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257 | parsedOptions[to].value = transformedOptions[to];
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258 | }
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259 | });
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260 |
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261 | this._parsedCommand.parsedOptions = parsedOptions;
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262 | this._parsedCommand.options = transformedOptions;
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263 | };
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264 |
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265 | private pushError = (type: ParserErrorType, message: string) => {
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266 | this._parserErrors.push(type, message);
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267 | };
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268 |
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269 | private getEnv = (): { [name: string]: string } => {
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270 | const cmd = this.parsedCommand.command;
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271 | const env: { [name: string]: string } = {};
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272 | if (cmd && cmd.env) {
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273 | return cmd.env;
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274 | }
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275 | return env;
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276 | };
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277 |
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278 | private parseArgsAndOptions = () => {
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279 | this.parseOptions();
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280 | if (this._parsedCommand.command) {
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281 | this.parseArgs();
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282 | }
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283 | };
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284 |
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285 | public get parsedCommand(): ParsedCliCommand {
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286 | if (!this._parsedCommand) {
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287 | this._parsedCommand = {};
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288 | this._parsedCommand.errors = this._parserErrors;
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289 | this._parsedCommand.program = this._commandPackage;
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290 | this._parsedCommand.run = this.runner;
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291 | this._parsedCommand.version = this.version;
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292 | this.parseCommandLine();
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293 | this.parseArgsAndOptions();
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294 | this._parsedCommand.env = this.getEnv();
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295 | }
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296 | return this._parsedCommand as ParsedCliCommand;
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297 | }
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298 |
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299 | private getParsedOptionCommandName = () => {
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300 | const parsed = this._parsedCommand;
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301 | return Object.keys(parsed.options)
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302 | .filter(o => typeof parsed.options[o] !== 'undefined')
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303 | .find(o => !!(parsed.optionDefinitions[o] && parsed.optionDefinitions[o].commandHandler));
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304 | };
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305 |
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306 | private setProcessEnvFromParsedCommand = () => {
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307 | Object.keys(this.parsedCommand.env).forEach(k => {
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308 | process.env[k] = this.parsedCommand.env[k];
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309 | });
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310 | };
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311 |
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312 | private promptArgsToArgVals = (promptArgs: object): string[] => {
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313 | const cmd = this.parsedCommand.command;
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314 | const defArgs = cmd ? cmd.arguments || [] : [];
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315 | const argVals: string[] = [];
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316 |
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317 | // Loop through definition arguments, and assign value from promptArgs Hash
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318 | for (let i = 0; i < defArgs.length; i++) {
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319 | const defArg = defArgs[i];
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320 | const promptArgVal = promptArgs[defArg.name];
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321 | if (defArg.isVariadic) {
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322 | const promptArgValAry = Array.isArray(promptArgVal) ? promptArgVal : [promptArgVal];
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323 | argVals.push(...promptArgValAry);
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324 | } else {
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325 | argVals.push(promptArgVal);
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326 | }
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327 | }
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328 |
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329 | return argVals;
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330 | };
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331 |
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332 | private runAndParsePrompt = async () => {
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333 | if (this.showPrompts) {
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334 | const parsedCommand = this._parsedCommand as ParsedCliCommand;
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335 | // call out to prompt handler to get args and options
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336 | const promptResult = await this.promptHandler(parsedCommand);
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337 | // reset arg/option errors
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338 | this._parserErrors.clearErrors('argument');
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339 | this._parserErrors.clearErrors('option');
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340 | // convert prompt arg values to command line array to re-parse them
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341 | this._argVals = this.promptArgsToArgVals(promptResult.arguments);
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342 | // assign prompt options to _optionVals to re-parse them
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343 | this._optionVals = promptResult.options;
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344 | // re-parse args and options from prompt values
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345 | this.parseArgsAndOptions();
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346 | }
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347 | };
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348 |
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349 | private runner = async (): Promise<CliRunResult> => {
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350 | const parsedCommand = this._parsedCommand as ParsedCliCommand;
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351 | // determine if an option is set to call a handler (in to over-ride the command def handler)
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352 | const commandOption = this.getParsedOptionCommandName();
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353 | let exitCode;
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354 | if (commandOption) {
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355 | // a selected option has it's own handler, set it up and run the option's handler (in lieu of the command's handler)
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356 | const commandOptionHandler = parsedCommand.optionDefinitions[commandOption].commandHandler;
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357 | exitCode = await Promise.resolve(commandOptionHandler(parsedCommand));
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358 | } else {
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359 | // delete options that are commands themselves (i.e. '--help', '--version')
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360 | Object.keys(parsedCommand.options)
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361 | .filter(
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362 | o => !!(parsedCommand.optionDefinitions[o] && parsedCommand.optionDefinitions[o].commandHandler)
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363 | )
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364 | .forEach(o => {
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365 | delete parsedCommand.options[o];
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366 | });
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367 |
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368 | await this.runAndParsePrompt();
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369 |
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370 | if (parsedCommand.errors.hasErrors) {
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371 | // parsed errors, call the errorHandler
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372 | exitCode = (await Promise.resolve(this.errorHandler(parsedCommand))) || 1;
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373 | } else {
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374 | // set process env from command env settings
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375 | this.setProcessEnvFromParsedCommand();
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376 |
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377 | // call the handler with parsed command
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378 | exitCode = await this.runHandler(parsedCommand);
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379 | }
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380 | }
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381 |
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382 | return {
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383 | parsedCommand,
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384 | exitCode: typeof exitCode == 'number' ? exitCode : 0,
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385 | };
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386 | };
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387 | }
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388 |
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