Fixing jenkinsci#216: partial logs not showing colors

[roehrijn]

I think this fixes #216. At least it does for my setup. But now the test hudson.plugins.ansicolor.ColorConsoleAnnotatorTest#testNoGlobalPipelineColorMap is failing and I do not fully understand about the mechanism behind.

Problem seems to be a mixture of a missing pipeline step log line which could define the color map name in combination with partial / progressive output. Whenever there is no log line originated from a pipeline step rendered before the first ANSI escape sequence, the color map stays null and the log lines are not converted to (colorful) HTML. This often happens when a lot of colorful logs are written between to pipeline log lines or no pipeline log line at all.

I thought it could be worth providing this PR even though the mentioned test is failing. I hope this can help to start a discussion and I can bring it towards a useful and sustainable fix.

[tszmytka]

Nice try but this really doesn't fix anything. Much too soon for a PR.
Your change enables the plugin's functionality for most of the output lines no matter if ansicolor is enabled or not which is a pretty important distinction.
Apart from the failing tests it would definitely cause a few additional issues from people using it to handle only part of their logs (or only specific lines).
As I wrote in #216 - what would be really helpful right now is a script or a pipeline reproducing the issue.

[roehrijn]

I think it is never too soon for a PR. I never expected this to be merged because I new that at least the tests are failing. As I just stated, I wanted to pinpoint the are where the problem is arising.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.