1 | 'use strict';
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2 |
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3 |
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4 |
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5 |
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6 | const _ = {
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7 | isNumber: require('lodash/isNumber'),
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8 | findIndex: require('lodash/findIndex'),
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9 | isString: require('lodash/isString'),
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10 | };
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11 | const chalk = require('chalk');
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12 | const figures = require('figures');
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13 | const cliCursor = require('cli-cursor');
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14 | const runAsync = require('run-async');
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15 | const { flatMap, map, take, takeUntil } = require('rxjs/operators');
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16 | const Base = require('./base');
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17 | const observe = require('../utils/events');
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18 | const Paginator = require('../utils/paginator');
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19 | const incrementListIndex = require('../utils/incrementListIndex');
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20 |
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21 | class ListPrompt extends Base {
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22 | constructor(questions, rl, answers) {
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23 | super(questions, rl, answers);
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24 |
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25 | if (!this.opt.choices) {
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26 | this.throwParamError('choices');
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27 | }
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28 |
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29 | this.firstRender = true;
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30 | this.selected = 0;
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31 |
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32 | const def = this.opt.default;
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33 |
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34 |
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35 | if (_.isNumber(def) && def >= 0 && def < this.opt.choices.realLength) {
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36 | this.selected = def;
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37 | } else if (!_.isNumber(def) && def != null) {
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38 | const index = _.findIndex(
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39 | this.opt.choices.realChoices,
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40 | ({ value }) => value === def
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41 | );
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42 | this.selected = Math.max(index, 0);
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43 | }
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44 |
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45 |
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46 | this.opt.default = null;
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47 |
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48 | const shouldLoop = this.opt.loop === undefined ? true : this.opt.loop;
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49 | this.paginator = new Paginator(this.screen, { isInfinite: shouldLoop });
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50 | }
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51 |
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52 | |
53 |
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54 |
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55 |
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56 |
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57 |
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58 | _run(cb) {
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59 | this.done = cb;
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60 |
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61 | const self = this;
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62 |
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63 | const events = observe(this.rl);
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64 | events.normalizedUpKey.pipe(takeUntil(events.line)).forEach(this.onUpKey.bind(this));
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65 | events.normalizedDownKey
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66 | .pipe(takeUntil(events.line))
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67 | .forEach(this.onDownKey.bind(this));
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68 | events.numberKey.pipe(takeUntil(events.line)).forEach(this.onNumberKey.bind(this));
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69 | events.line
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70 | .pipe(
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71 | take(1),
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72 | map(this.getCurrentValue.bind(this)),
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73 | flatMap((value) =>
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74 | runAsync(self.opt.filter)(value, self.answers).catch((err) => err)
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75 | )
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76 | )
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77 | .forEach(this.onSubmit.bind(this));
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78 |
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79 |
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80 | cliCursor.hide();
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81 | this.render();
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82 |
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83 | return this;
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84 | }
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85 |
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86 | |
87 |
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88 |
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89 |
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90 |
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91 | render() {
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92 |
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93 | let message = this.getQuestion();
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94 |
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95 | if (this.firstRender) {
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96 | message += chalk.dim('(Use arrow keys)');
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97 | }
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98 |
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99 |
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100 | if (this.status === 'answered') {
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101 | message += chalk.cyan(this.opt.choices.getChoice(this.selected).short);
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102 | } else {
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103 | const choicesStr = listRender(this.opt.choices, this.selected);
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104 | const indexPosition = this.opt.choices.indexOf(
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105 | this.opt.choices.getChoice(this.selected)
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106 | );
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107 | const realIndexPosition =
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108 | this.opt.choices.reduce((acc, value, i) => {
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109 |
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110 | if (i > indexPosition) {
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111 | return acc;
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112 | }
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113 |
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114 | if (value.type === 'separator') {
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115 | return acc + 1;
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116 | }
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117 |
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118 | let l = value.name;
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119 |
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120 | if (typeof l !== 'string') {
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121 | return acc + 1;
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122 | }
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123 |
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124 |
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125 | l = l.split('\n');
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126 | return acc + l.length;
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127 | }, 0) - 1;
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128 | message +=
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129 | '\n' + this.paginator.paginate(choicesStr, realIndexPosition, this.opt.pageSize);
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130 | }
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131 |
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132 | this.firstRender = false;
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133 |
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134 | this.screen.render(message);
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135 | }
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136 |
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137 | |
138 |
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139 |
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140 |
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141 | onSubmit(value) {
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142 | this.status = 'answered';
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143 |
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144 |
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145 | this.render();
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146 |
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147 | this.screen.done();
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148 | cliCursor.show();
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149 | this.done(value);
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150 | }
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151 |
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152 | getCurrentValue() {
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153 | return this.opt.choices.getChoice(this.selected).value;
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154 | }
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155 |
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156 | |
157 |
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158 |
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159 | onUpKey() {
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160 | this.selected = incrementListIndex(this.selected, 'up', this.opt);
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161 | this.render();
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162 | }
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163 |
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164 | onDownKey() {
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165 | this.selected = incrementListIndex(this.selected, 'down', this.opt);
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166 | this.render();
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167 | }
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168 |
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169 | onNumberKey(input) {
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170 | if (input <= this.opt.choices.realLength) {
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171 | this.selected = input - 1;
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172 | }
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173 |
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174 | this.render();
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175 | }
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176 | }
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177 |
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178 |
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179 |
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180 |
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181 |
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182 |
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183 | function listRender(choices, pointer) {
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184 | let output = '';
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185 | let separatorOffset = 0;
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186 |
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187 | choices.forEach((choice, i) => {
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188 | if (choice.type === 'separator') {
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189 | separatorOffset++;
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190 | output += ' ' + choice + '\n';
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191 | return;
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192 | }
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193 |
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194 | if (choice.disabled) {
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195 | separatorOffset++;
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196 | output += ' - ' + choice.name;
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197 | output += ' (' + (_.isString(choice.disabled) ? choice.disabled : 'Disabled') + ')';
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198 | output += '\n';
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199 | return;
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200 | }
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201 |
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202 | const isSelected = i - separatorOffset === pointer;
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203 | let line = (isSelected ? figures.pointer + ' ' : ' ') + choice.name;
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204 | if (isSelected) {
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205 | line = chalk.cyan(line);
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206 | }
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207 |
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208 | output += line + ' \n';
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209 | });
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210 |
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211 | return output.replace(/\n$/, '');
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212 | }
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213 |
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214 | module.exports = ListPrompt;
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