Replace comma-separated envvars with comma+whitespace separated envvars

[mrnoname1000]

Enhancement Type

Improve an existing feature

Describe the enhancement

Seems like there are some envvars that split on commas, some on commas+newlines, some on commas+whitespace, and others on just whitespace. I propose replacing all of the first type with comma+whitespace splits unless they rely on newlines being retained (which I don't see being an issue). In places where commas are required (e.g. in mc-image-helper, and are they really required?), values can first be split on commas+whitespace, then re-joined on commas:

IFS=,$IFS                          # prepend comma to $IFS
plugins=($PLUGINS)                 # split on $IFS (comma+whitespace)
mc-image-helper mcopy ... "$*"     # join with comma
IFS=${IFS#?}                       # restore $IFS

The motivation behind this issue is this snippet from my docker-compose.yml:

SPIGET_RESOURCES:
  # spark,discordsrv,deathchest,pluginmanager,spark,veinminer #,vault,essentialsx
  57242,18494,101066,69061,57242,12038 #,34315,9089

Notice how I accidentally duplicated one of the plugins. Ignoring how cryptic YAML multiline indicators are, I would prefer to write this instead:

SPIGET_RESOURCES: >-
  57242   # spark
  18494   # discordsrv
  101066  # deathchest
  69061   # pluginmanager
  12038   # veinminer
  #34315   # vault
  #9089    # essentialsx

I can work on a PR for this if we're in agreement!

[itzg]

Yes, those need to be brought into consistency of commas or newlines. Spaces might be significant so it is harder to declare that as the ubiquitous arg delimiter. There is a constant already for comma or newline

https://github.com/itzg/mc-image-helper/blob/388da11f847afd663ccd08f7544cb0720e1de000/src/main/java/me/itzg/helpers/McImageHelper.java#L95

A PR would be great, but change only one place first like SPIGET_RESOURCES so I can see what you have in mind.

[itzg]

...actually SPIGET_RESOURCES is an unusual case since that's one of the next things I want to port over to mc-image-helper. At that point, it'll get the proper comma or whitespace/newline arg delimiting support. Also, support for inline comments is actually a feature that I was discussing with someone on Discord.