Created by: alanhoyle
This should detect container status for shells running in Singularity, Docker, LXC and Podman containers.
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Singularity is detected by the existence of shell variables that singularity creates inside containers. Note: it appears that Singularity clears the PROMPT_COMMAND by default, so updates to the shell prompt are broken.
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Podman is detected by the existence of a file as documented at https://github.com/containers/libpod/blob/master/docs/podman-run.1.md
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Docker and LXC are detected by checking for the existence of a file in the /proc virtual hierarchy, and grepping that file for their names.
Note that it also fixes a couple of minor, unrelated things that could be pulled out into a separate pull:
E.g. corrected spelling of "truncated" in liquidprompt and putting the POWERLINE_DIRSTACK_COLOR line in the correct alphabetical spot inthemes/powerline/powerline.theme
Also, the changes in title/subtitle notations in docs/config.rst were done by the Emacs ReST mode, which I believe would know the format far better than me.