Fix Zsh's missing compinit

On HPCs (e.g., TACC’s Stampede2, Purdue’s Anvil), the prompt is usually broken, and you are notified of the missing compinit. For example,

/home/user/.oh-my-zsh/oh-my-zsh.sh:124: compinit: function definition file not found

This is likely because Zsh’s function lookup path fpath, collides with a predefined FPATH in Lmod.

This can be fixed by manually setting the fpath in .zshrc. For example:

fpath=(
  /usr/share/zsh/5.5.1/functions
  /usr/share/zsh-completions
  /usr/share/zsh/site-functions
)

References

• FPATH gets carried to ZSH when using bash, even when SUPPORT_KSH is set to “no” · Issue #555 · TACC/Lmod (github.com)
• zsh-completions require compinit in the .zshrc file? · Issue #277 · zsh-users/zsh-completions (github.com)