git/local/bin/gpg2-for-git-signing

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#!/bin/zsh
# There's a weird inconsistency between the --default-key and --local-user
# arguments: when you have multiple signing subkeys, --local-user chooses the
# newest, and --default-key chooses the one that's available. The latter is
# clearly preferable. So we shuffle the arguments around a little.
for arg; do
if [[ $arg = -bsau ]]; then
args+=(-bsa --default-key)
else
args+=($arg)
fi
done
exec gpg2 --no-tty "${(@)args}"