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qwen/nodejs/node_modules/prompts/lib/elements/multiselect.js

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+'use strict';
+
+const color = require('kleur');
+const { cursor } = require('sisteransi');
+const Prompt = require('./prompt');
+const { clear, figures, style, wrap, entriesToDisplay } = require('../util');
+
+/**
+ * MultiselectPrompt Base Element
+ * @param {Object} opts Options
+ * @param {String} opts.message Message
+ * @param {Array} opts.choices Array of choice objects
+ * @param {String} [opts.hint] Hint to display
+ * @param {String} [opts.warn] Hint shown for disabled choices
+ * @param {Number} [opts.max] Max choices
+ * @param {Number} [opts.cursor=0] Cursor start position
+ * @param {Number} [opts.optionsPerPage=10] Max options to display at once
+ * @param {Stream} [opts.stdin] The Readable stream to listen to
+ * @param {Stream} [opts.stdout] The Writable stream to write readline data to
+ */
+class MultiselectPrompt extends Prompt {
+  constructor(opts={}) {
+    super(opts);
+    this.msg = opts.message;
+    this.cursor = opts.cursor || 0;
+    this.scrollIndex = opts.cursor || 0;
+    this.hint = opts.hint || '';
+    this.warn = opts.warn || '- This option is disabled -';
+    this.minSelected = opts.min;
+    this.showMinError = false;
+    this.maxChoices = opts.max;
+    this.instructions = opts.instructions;
+    this.optionsPerPage = opts.optionsPerPage || 10;
+    this.value = opts.choices.map((ch, idx) => {
+      if (typeof ch === 'string')
+        ch = {title: ch, value: idx};
+      return {
+        title: ch && (ch.title || ch.value || ch),
+        description: ch && ch.description,
+        value: ch && (ch.value === undefined ? idx : ch.value),
+        selected: ch && ch.selected,
+        disabled: ch && ch.disabled
+      };
+    });
+    this.clear = clear('', this.out.columns);
+    if (!opts.overrideRender) {
+      this.render();
+    }
+  }
+
+  reset() {
+    this.value.map(v => !v.selected);
+    this.cursor = 0;
+    this.fire();
+    this.render();
+  }
+
+  selected() {
+    return this.value.filter(v => v.selected);
+  }
+
+  exit() {
+    this.abort();
+  }
+
+  abort() {
+    this.done = this.aborted = true;
+    this.fire();
+    this.render();
+    this.out.write('\n');
+    this.close();
+  }
+
+  submit() {
+    const selected = this.value
+      .filter(e => e.selected);
+    if (this.minSelected && selected.length < this.minSelected) {
+      this.showMinError = true;
+      this.render();
+    } else {
+      this.done = true;
+      this.aborted = false;
+      this.fire();
+      this.render();
+      this.out.write('\n');
+      this.close();
+    }
+  }
+
+  first() {
+    this.cursor = 0;
+    this.render();
+  }
+
+  last() {
+    this.cursor = this.value.length - 1;
+    this.render();
+  }
+  next() {
+    this.cursor = (this.cursor + 1) % this.value.length;
+    this.render();
+  }
+
+  up() {
+    if (this.cursor === 0) {
+      this.cursor = this.value.length - 1;
+    } else {
+      this.cursor--;
+    }
+    this.render();
+  }
+
+  down() {
+    if (this.cursor === this.value.length - 1) {
+      this.cursor = 0;
+    } else {
+      this.cursor++;
+    }
+    this.render();
+  }
+
+  left() {
+    this.value[this.cursor].selected = false;
+    this.render();
+  }
+
+  right() {
+    if (this.value.filter(e => e.selected).length >= this.maxChoices) return this.bell();
+    this.value[this.cursor].selected = true;
+    this.render();
+  }
+
+  handleSpaceToggle() {
+    const v = this.value[this.cursor];
+
+    if (v.selected) {
+      v.selected = false;
+      this.render();
+    } else if (v.disabled || this.value.filter(e => e.selected).length >= this.maxChoices) {
+      return this.bell();
+    } else {
+      v.selected = true;
+      this.render();
+    }
+  }
+
+  toggleAll() {
+    if (this.maxChoices !== undefined || this.value[this.cursor].disabled) {
+      return this.bell();
+    }
+
+    const newSelected = !this.value[this.cursor].selected;
+    this.value.filter(v => !v.disabled).forEach(v => v.selected = newSelected);
+    this.render();
+  }
+
+  _(c, key) {
+    if (c === ' ') {
+      this.handleSpaceToggle();
+    } else if (c === 'a') {
+      this.toggleAll();
+    } else {
+      return this.bell();
+    }
+  }
+
+  renderInstructions() {
+    if (this.instructions === undefined || this.instructions) {
+      if (typeof this.instructions === 'string') {
+        return this.instructions;
+      }
+      return '\nInstructions:\n'
+        + `    ${figures.arrowUp}/${figures.arrowDown}: Highlight option\n`
+        + `    ${figures.arrowLeft}/${figures.arrowRight}/[space]: Toggle selection\n`
+        + (this.maxChoices === undefined ? `    a: Toggle all\n` : '')
+        + `    enter/return: Complete answer`;
+    }
+    return '';
+  }
+
+  renderOption(cursor, v, i, arrowIndicator) {
+    const prefix = (v.selected ? color.green(figures.radioOn) : figures.radioOff) + ' ' + arrowIndicator + ' ';
+    let title, desc;
+
+    if (v.disabled) {
+      title = cursor === i ? color.gray().underline(v.title) : color.strikethrough().gray(v.title);
+    } else {
+      title = cursor === i ? color.cyan().underline(v.title) : v.title;
+      if (cursor === i && v.description) {
+        desc = ` - ${v.description}`;
+        if (prefix.length + title.length + desc.length >= this.out.columns
+          || v.description.split(/\r?\n/).length > 1) {
+          desc = '\n' + wrap(v.description, { margin: prefix.length, width: this.out.columns });
+        }
+      }
+    }
+
+    return prefix + title + color.gray(desc || '');
+  }
+
+  // shared with autocompleteMultiselect
+  paginateOptions(options) {
+    if (options.length === 0) {
+      return color.red('No matches for this query.');
+    }
+
+    let { startIndex, endIndex } = entriesToDisplay(this.cursor, options.length, this.optionsPerPage);
+    let prefix, styledOptions = [];
+
+    for (let i = startIndex; i < endIndex; i++) {
+      if (i === startIndex && startIndex > 0) {
+        prefix = figures.arrowUp;
+      } else if (i === endIndex - 1 && endIndex < options.length) {
+        prefix = figures.arrowDown;
+      } else {
+        prefix = ' ';
+      }
+      styledOptions.push(this.renderOption(this.cursor, options[i], i, prefix));
+    }
+
+    return '\n' + styledOptions.join('\n');
+  }
+
+  // shared with autocomleteMultiselect
+  renderOptions(options) {
+    if (!this.done) {
+      return this.paginateOptions(options);
+    }
+    return '';
+  }
+
+  renderDoneOrInstructions() {
+    if (this.done) {
+      return this.value
+        .filter(e => e.selected)
+        .map(v => v.title)
+        .join(', ');
+    }
+
+    const output = [color.gray(this.hint), this.renderInstructions()];
+
+    if (this.value[this.cursor].disabled) {
+      output.push(color.yellow(this.warn));
+    }
+    return output.join(' ');
+  }
+
+  render() {
+    if (this.closed) return;
+    if (this.firstRender) this.out.write(cursor.hide);
+    super.render();
+
+    // print prompt
+    let prompt = [
+      style.symbol(this.done, this.aborted),
+      color.bold(this.msg),
+      style.delimiter(false),
+      this.renderDoneOrInstructions()
+    ].join(' ');
+    if (this.showMinError) {
+      prompt += color.red(`You must select a minimum of ${this.minSelected} choices.`);
+      this.showMinError = false;
+    }
+    prompt += this.renderOptions(this.value);
+
+    this.out.write(this.clear + prompt);
+    this.clear = clear(prompt, this.out.columns);
+  }
+}
+
+module.exports = MultiselectPrompt;