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

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+'use strict';
+
+const color = require('kleur');
+const Prompt = require('./prompt');
+const { style, clear, figures, wrap, entriesToDisplay } = require('../util');
+const { cursor } = require('sisteransi');
+
+/**
+ * SelectPrompt 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 {Number} [opts.initial] Index of default value
+ * @param {Stream} [opts.stdin] The Readable stream to listen to
+ * @param {Stream} [opts.stdout] The Writable stream to write readline data to
+ * @param {Number} [opts.optionsPerPage=10] Max options to display at once
+ */
+class SelectPrompt extends Prompt {
+  constructor(opts={}) {
+    super(opts);
+    this.msg = opts.message;
+    this.hint = opts.hint || '- Use arrow-keys. Return to submit.';
+    this.warn = opts.warn || '- This option is disabled';
+    this.cursor = opts.initial || 0;
+    this.choices = opts.choices.map((ch, idx) => {
+      if (typeof ch === 'string')
+        ch = {title: ch, value: idx};
+      return {
+        title: ch && (ch.title || ch.value || ch),
+        value: ch && (ch.value === undefined ? idx : ch.value),
+        description: ch && ch.description,
+        selected: ch && ch.selected,
+        disabled: ch && ch.disabled
+      };
+    });
+    this.optionsPerPage = opts.optionsPerPage || 10;
+    this.value = (this.choices[this.cursor] || {}).value;
+    this.clear = clear('', this.out.columns);
+    this.render();
+  }
+
+  moveCursor(n) {
+    this.cursor = n;
+    this.value = this.choices[n].value;
+    this.fire();
+  }
+
+  reset() {
+    this.moveCursor(0);
+    this.fire();
+    this.render();
+  }
+
+  exit() {
+    this.abort();
+  }
+
+  abort() {
+    this.done = this.aborted = true;
+    this.fire();
+    this.render();
+    this.out.write('\n');
+    this.close();
+  }
+
+  submit() {
+    if (!this.selection.disabled) {
+      this.done = true;
+      this.aborted = false;
+      this.fire();
+      this.render();
+      this.out.write('\n');
+      this.close();
+    } else
+      this.bell();
+  }
+
+  first() {
+    this.moveCursor(0);
+    this.render();
+  }
+
+  last() {
+    this.moveCursor(this.choices.length - 1);
+    this.render();
+  }
+
+  up() {
+    if (this.cursor === 0) {
+      this.moveCursor(this.choices.length - 1);
+    } else {
+      this.moveCursor(this.cursor - 1);
+    }
+    this.render();
+  }
+
+  down() {
+    if (this.cursor === this.choices.length - 1) {
+      this.moveCursor(0);
+    } else {
+      this.moveCursor(this.cursor + 1);
+    }
+    this.render();
+  }
+
+  next() {
+    this.moveCursor((this.cursor + 1) % this.choices.length);
+    this.render();
+  }
+
+  _(c, key) {
+    if (c === ' ') return this.submit();
+  }
+
+  get selection() {
+    return this.choices[this.cursor];
+  }
+
+  render() {
+    if (this.closed) return;
+    if (this.firstRender) this.out.write(cursor.hide);
+    else this.out.write(clear(this.outputText, this.out.columns));
+    super.render();
+
+    let { startIndex, endIndex } = entriesToDisplay(this.cursor, this.choices.length, this.optionsPerPage);
+
+    // Print prompt
+    this.outputText = [
+      style.symbol(this.done, this.aborted),
+      color.bold(this.msg),
+      style.delimiter(false),
+      this.done ? this.selection.title : this.selection.disabled
+          ? color.yellow(this.warn) : color.gray(this.hint)
+    ].join(' ');
+
+    // Print choices
+    if (!this.done) {
+      this.outputText += '\n';
+      for (let i = startIndex; i < endIndex; i++) {
+        let title, prefix, desc = '', v = this.choices[i];
+
+        // Determine whether to display "more choices" indicators
+        if (i === startIndex && startIndex > 0) {
+          prefix = figures.arrowUp;
+        } else if (i === endIndex - 1 && endIndex < this.choices.length) {
+          prefix = figures.arrowDown;
+        } else {
+          prefix = ' ';
+        }
+
+        if (v.disabled) {
+          title = this.cursor === i ? color.gray().underline(v.title) : color.strikethrough().gray(v.title);
+          prefix = (this.cursor === i ? color.bold().gray(figures.pointer) + ' ' : '  ') + prefix;
+        } else {
+          title = this.cursor === i ? color.cyan().underline(v.title) : v.title;
+          prefix = (this.cursor === i ? color.cyan(figures.pointer) + ' ' : '  ') + prefix;
+          if (v.description && this.cursor === i) {
+            desc = ` - ${v.description}`;
+            if (prefix.length + title.length + desc.length >= this.out.columns
+                || v.description.split(/\r?\n/).length > 1) {
+              desc = '\n' + wrap(v.description, { margin: 3, width: this.out.columns });
+            }
+          }
+        }
+
+        this.outputText += `${prefix} ${title}${color.gray(desc)}\n`;
+      }
+    }
+
+    this.out.write(this.outputText);
+  }
+}
+
+module.exports = SelectPrompt;