Zsh dollar zero $0

dollarzero.zsh

# Use %N in a file
0=${(%):-%N}
echo "dollar zero: $0"

# Use :a to get the absolute path
echo "dollar zero abs path: ${0:a}"

# Use :A to get the absolute path resolving symlinks
echo "dollar zero abs path: ${0:A}"

# You may see this kind of thing from the Cargo Cultists:
# https://zdharma-continuum.github.io/Zsh-100-Commits-Club/Zsh-Plugin-Standard.html#zero-handling
0="${ZERO:-${${0:#$ZSH_ARGZERO}:-${(%):-%N}}}"
0="${${(M)0:#/*}:-$PWD/$0}"
echo "cargo cult dollar zero: $0"

() {
  # Use %x in a function
  0=${(%):-%x}
  echo "func dollar zero: $0"
}