shellName() Revamp

[ReedClanton]

Description

Decide if shellName() should be kept (i.e. is it sufficiently complex task to need a function). If it is kept, rework when it's sourced so it can be used as early in the environment setup process as possible.

High Level Solution Description

Determine if getting the current shell's name is complex enough to warrant having a function for it. If it is, revamp when shellName() is sourced so it can be used as early in the environment setup process as possible. This should likely also include changing when all shell functions are sourced.

Alternative Solution(s)

None.

Blocked By

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Blocking

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Related Issue(s)

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Additional Context

None.