#!/bin/sh

file_part="$1"
comment_part="$2"
key_type="${3:-ed25519}"

if test -z "$file_part" -o -z "$comment_part"; then
    echo "usage: gen-ssh-key FILE_PART COMMENT_PART [KEY_TYPE]" 1>&2
    exit 2
fi

file="${HOME}/.ssh/id_${key_type}_${file_part}_$(date +%Y)"
comment="$(whoami)@$(hostname):$(date +%Y-%m-%d):${comment_part}"

ssh-keygen -t "$key_type" -f "$file" -C "$comment"
cat "${file}.pub"