Infinite loop in TerminalLine constructor

[loveleif]

The constructor of LineReaderImpl$TerminalLine can go into an infinite loop under certain circumstances.

It seems to be caused by width being zero. We have seen it when using jansi in the following environments:

• Docker version 18.03.1-ce (works after updating docker).
• Running tests through maven on OSX with custom input/output streams for the terminal.

[loveleif]

I will try to re-create the issue in a small example project and get back.

[loveleif]

Here is an example project that will cause the infinite loop in certain environments when you run mvn test https://github.com/loveleif/jline-infinate-loop.

It happens on my machine and I use:

• macOS 12.0.1
• Apache Maven 3.8.3
• Java 17 (OpenJDK build 17+35-2724)

Note: Without .variable( LineReader.SECONDARY_PROMPT_PATTERN, "%P " ) it doesn't go into infinite loop.

@Test
void test() throws IOException
{
    var in = new ByteArrayInputStream( "hello\nworld\n".getBytes( StandardCharsets.UTF_8 ) );
    var out = new ByteArrayOutputStream(1024);

    var terminal = TerminalBuilder.builder().streams( in, out ).build();
    var lineReader = LineReaderBuilder.builder()
            .terminal( terminal )
            .variable( LineReader.SECONDARY_PROMPT_PATTERN, "%P " )
            .build();

    var read1 = lineReader.readLine("Input1: ");
    var read2 = lineReader.readLine("Input2: ");

    assertEquals( "hello", read1 );
    assertEquals( "world", read2 );
}