git-prompt.sh: remove annoying space when MSYSTEM not set

[DRSDavidSoft]

Signed-off-by: David Refoua David@Refoua.me

This commit removes the annoying double space in the first line of PS1 when MSYSTEM is not set.

[DRSDavidSoft]

CI is failing a sha256sum checksum

[dscho]

While I suspect that the use case is broken (because MSYSTEM should always be set), I am open to getting convinced that it makes sense.

But a terse "remove annoying space when MSYSTEM not set" does not even begin to convince anyone.

In other words, this change needs a substantially improved commit message, one in accordance to https://github.blog/2022-06-30-write-better-commits-build-better-projects/.

After that is done, a better way to implement this is:

Suggested change

	if [ ! -z "$MSYSTEM" ]
	then
	PS1="$PS1"'\[\033[35m\]' # change to purple
	PS1="$PS1"'$MSYSTEM ' # show MSYSTEM
	fi
	PS1="$PS1${MSYSTEM:+\[\033[35m\]$MSYSTEM }" # show MSYSTEM in purple (if set)

[dscho]

this change needs a substantially improved commit message

@DRSDavidSoft are you working on this?

[dscho]

While I suspect that the use case is broken (because MSYSTEM should always be set), I am open to getting convinced that it makes sense.

This PR has not seen any attempt to motivate the change in the past 3 weeks, therefore I'll close it.