Method DoMetaCommand

tools/shell/shell.cpp:2401–2492

** If an input line begins with "." then invoke this routine to ** process that line. ** ** Return 1 on error, 2 to exit, and 0 otherwise. */

** Return 1 on error, 2 to exit, and 0 otherwise.
*/
int ShellState::DoMetaCommand(const string &zLine) {
	int rc = 0;
	vector<string> args;
	// skip initial dot
	idx_t pos = 1;
	while (pos < zLine.size()) {
		// skip initial spaces
		while (pos < zLine.size() && IsSpace(zLine[pos])) {
			pos++;
		}
		if (pos >= zLine.size()) {
			break;
		}
		string arg;
		if (zLine[pos] == '\'' || zLine[pos] == '"') {
			// quoted argument - scan until next quote
			auto quote = zLine[pos];
			// skip over the initial quote
			pos++;

			while (pos < zLine.size() && zLine[pos] != quote) {
				if (zLine[pos] == '\\' && quote == '"' && pos + 1 < zLine.size()) {
					// skip over any escaped characters
					arg += zLine[pos++];
				}
				arg += zLine[pos++];
			}
			if (pos < zLine.size()) {
				// skip over the final quote
				pos++;
			}
			if (quote == '"') {
				arg = resolve_backslashes(arg);
			}
		} else {
			// unquoted argument - scan until the next space
			while (pos < zLine.size() && !IsSpace(zLine[pos])) {
				arg += zLine[pos];
				pos++;
			}
			arg = resolve_backslashes(arg);
		}
		args.push_back(std::move(arg));
	}

	/* Process the input line.
	 */
	if (args.empty()) {
		return 0; /* no tokens, no error */
	}
	ClearTempFile();

	string error_msg;
	auto metadata_command = FindMetadataCommand(args[0], error_msg);
	if (!metadata_command) {
		// command not found
		PrintDatabaseError(error_msg);
		rc = 1;