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