64 lines
1.8 KiB
JavaScript
64 lines
1.8 KiB
JavaScript
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'use strict';
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const utils = require('./utils');
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/**
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* Render a placeholder value with cursor and styling based on the
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* position of the cursor.
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*
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* @param {Object} `prompt` Prompt instance.
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* @param {String} `input` Input string.
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* @param {String} `initial` The initial user-provided value.
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* @param {Number} `pos` Current cursor position.
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* @param {Boolean} `showCursor` Render a simulated cursor using the inverse primary style.
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* @return {String} Returns the styled placeholder string.
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* @api public
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*/
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module.exports = (prompt, options = {}) => {
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prompt.cursorHide();
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let { input = '', initial = '', pos, showCursor = true, color } = options;
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let style = color || prompt.styles.placeholder;
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let inverse = utils.inverse(prompt.styles.primary);
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let blinker = str => inverse(prompt.styles.black(str));
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let output = input;
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let char = ' ';
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let reverse = blinker(char);
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if (prompt.blink && prompt.blink.off === true) {
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blinker = str => str;
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reverse = '';
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}
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if (showCursor && pos === 0 && initial === '' && input === '') {
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return blinker(char);
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}
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if (showCursor && pos === 0 && (input === initial || input === '')) {
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return blinker(initial[0]) + style(initial.slice(1));
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}
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initial = utils.isPrimitive(initial) ? `${initial}` : '';
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input = utils.isPrimitive(input) ? `${input}` : '';
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let placeholder = initial && initial.startsWith(input) && initial !== input;
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let cursor = placeholder ? blinker(initial[input.length]) : reverse;
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if (pos !== input.length && showCursor === true) {
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output = input.slice(0, pos) + blinker(input[pos]) + input.slice(pos + 1);
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cursor = '';
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}
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if (showCursor === false) {
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cursor = '';
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}
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if (placeholder) {
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let raw = prompt.styles.unstyle(output + cursor);
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return output + cursor + style(initial.slice(raw.length));
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}
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return output + cursor;
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};
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