@jawis/stdio-filter/console-filter-screen.js

Filter the stdio from console applications.

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.makeUpdateScreen = void 0;
const _jab_1 = require("^jab");
/**
 *
 */
const makeUpdateScreen = (deps) => {
    let cursorPos = 0;
    const shown = [];
    const gotoAndClearLine = (lineNumber) => {
        const diff = lineNumber - cursorPos;
        //move up/down
        if (diff < 0) {
            deps.streamOutput("\x1B[" + -diff + "A");
        }
        else if (diff > 0) {
            deps.streamOutput("\x1B[" + diff + "B");
        }
        //erase line
        deps.streamOutput("\x1B[2K");
        //goto start of line
        deps.streamOutput("\x1B[1G");
        //done
        cursorPos = lineNumber;
    };
    const outputLine = (lineNumber, line) => {
        (0, _jab_1.assert)(line.indexOf("\n") === -1);
        gotoAndClearLine(lineNumber);
        deps.streamOutput(line);
        shown[lineNumber] = line;
    };
    return (lines) => {
        for (let i = 0; i < lines.length; i++) {
            const line = lines[i];
            if (shown[i] !== line) {
                outputLine(i, line);
            }
        }
        // clear old lines, not used anymore.
        const count = shown.length - lines.length;
        for (let i = 0; i < count; i++) {
            gotoAndClearLine(lines.length + i);
        }
    };
};
exports.makeUpdateScreen = makeUpdateScreen;