Function parsePublishedHostPorts

packages/setupWizard/src/index.ts:148–185

(composeYaml: string)

// of host ports it would publish. Sufficient for our generated compose file; not a
// full YAML parser.
function parsePublishedHostPorts(composeYaml: string): PublishedPort[] {
    const ports: PublishedPort[] = [];
    let blockIndent = -1;
    for (const rawLine of composeYaml.split('\n')) {
        const line = rawLine.replace(/\r$/, '');
        if (/^\s*$/.test(line)) {
            continue;
        }
        const indent = line.length - line.trimStart().length;
        const portsKey = line.match(/^(\s*)ports:\s*(#.*)?$/);
        if (portsKey) {
            blockIndent = portsKey[1].length;
            continue;
        }
        if (blockIndent < 0) {
            continue;
        }
        const item = line.match(/^\s*-\s*(.+?)\s*$/);
        if (item && indent > blockIndent) {
            const parsed = parseHostPortSpec(item[1]);
            if (parsed) {
                ports.push(parsed);
            }
            continue;
        }
        // Any non-list line (a sibling key or dedent) ends the ports block.
        blockIndent = -1;
    }
    const seen = new Set<string>();
    return ports.filter((p) => {
        const key = `${p.host}:${p.port}`;
        if (seen.has(key)) {
            return false;
        }
        seen.add(key);
        return true;
    });
}

// Authoritatively checks whether a host port is already bound by attempting to bind
// it ourselves — this catches any process (Docker or not, e.g. a local Postgres on