less-pager-mini/dist/wrapLongLines.js

A scrollable terminal pager for Node.js CLI apps (terminal only)

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.wrapLongLines = wrapLongLines;
const config_1 = require("./config");
const helpers_1 = require("./helpers");
/**
 * Wraps lines into subrows to fit screen width and fills the window.
 *
 * @param content - Full content lines.
 * @param lines - Output array of wrapped lines.
 */
function wrapLongLines(content, lines) {
    const maxRow = content.length - config_1.config.row;
    let row = 0;
    let isCompleteLine = true;
    let line = content[config_1.config.row];
    if (config_1.config.subRow) {
        isCompleteLine = partitionLine(lines, line, config_1.config.subRow);
        row++;
    }
    while (lines.length < config_1.config.window - 1 && row < maxRow) {
        line = content[config_1.config.row + row];
        if ((0, helpers_1.visualWidth)(line) > config_1.config.screenWidth) {
            isCompleteLine = partitionLine(lines, line, 0);
        }
        else {
            lines.push(line);
        }
        row++;
    }
    config_1.mode.EOF = isCompleteLine && row === maxRow;
}
/**
 * Wraps a long line into subrows and appends them to `lines`.
 *
 * - Starts from `subRowStart` for partial line display.
 * - Stops early if window limit is reached.
 *
 * @param lines - Output array for wrapped segments.
 * @param longLine - The line to split and wrap.
 * @param subRowStart - Starting subrow index (default 0).
 * @returns `true` if the line is fully wrapped, `false` if truncated.
 */
function partitionLine(lines, longLine, subRowStart) {
    let line = [];
    const segments = Array.from(longLine);
    let length = 0;
    let subRow = 0;
    for (let i = 0; i < segments.length; i++) {
        const segment = segments[i];
        const segmentWidth = (0, helpers_1.visualWidth)(segment);
        const concatLength = length + segmentWidth;
        if (concatLength < config_1.config.screenWidth) {
            line.push(segment);
            length = concatLength;
            continue;
        }
        const overflow = concatLength > config_1.config.screenWidth;
        if (subRow >= subRowStart) {
            if (lines.length === config_1.config.window - 1)
                return false;
            if (!overflow)
                line.push(segment);
            lines.push(line.join(''));
        }
        line = overflow ? [segment] : [];
        length = overflow ? segmentWidth : 0;
        subRow++;
    }
    if (line.length && subRow >= subRowStart) {
        if (lines.length === config_1.config.window - 1)
            return false;
        lines.push(line.join(''));
    }
    return true;
}