kubeconf is a program that assists in managing multiple kubeconfigs. It remembers where kubeconfigs are and allows switching between them.

kubeconf

#!/usr/bin/env bash

KUBECONF_CONFIG_DIR="${XDG_CONFIG_HOME:-"$HOME/.config"}/kubeconf"
KUBECONF_KNOWN_CONFIGS="$KUBECONF_CONFIG_DIR/known_configs"

kubeconf() {
	case "$1" in
	a|add)
		_kubeconf::add "${@:2}"
		;;
	u|use)
		_kubeconf::use "$2"
		;;
	e|edit)
		_kubeconf::edit
		;;
	ls|list)
		_kubeconf::list
		;;
	*)
		_kubeconf::usage
		;;
	esac
}

_kubeconf::usage() {
	cat<<EOF
kubeconf is a program that assists in managing multiple kubeconfigs.
It remembers where kubeconfigs are and allows switching between them.

Usage:
	kubeconf a|add   - Add a kubeconfig file.
	kubeconf a|use   - Switch to the kubeconfig file.
	kubeconf e|edit  - Edit list of known kubeconfig files.
	kubeconf ls|list - List known kubeconfig files.
EOF
}

_kubeconf::add() {
	mkdir -p "$KUBECONF_CONFIG_DIR"

	declare -A kubeconfig_known_configs
	while read -r f; do
		kubeconfig_known_configs["$(basename "$f")"]="$f"
	done < <(_kubeconf::known_configs)

	local p
	local n

	for f in "$@"; do
		p="$(realpath "$f")"
		if [[ ! -f "$p" ]]; then
			echo "File $f does not exist." >&2
			return 1
		fi

		n="$(basename "$p")"
		if [[ "${kubeconfig_known_configs["$n"]}" ]]; then
			echo "Name $n is already known." >&2
			return 1
		fi

		echo "$p" >> "$KUBECONF_KNOWN_CONFIGS"
	done
}

_kubeconf::use() {
	local f

	while read -r f; do
		if [[ "$1" == "$f" || "$1" == "$(basename "$f")" ]]; then
			export KUBECONFIG="$f"
			return
		fi
	done < <(_kubeconf::known_configs)

	printf "Kubeconfig %q not found.\n" "$1" >&2
	return 1
}

_kubeconf::list() {
	local f
	echo "Known kubeconfigs:"
	_kubeconf::known_configs | while read -r f; do
		echo "  - $(basename "$f"): $f"
	done
}

_kubeconf::edit() {
	"${EDITOR:-vim}" "$KUBECONF_KNOWN_CONFIGS"
}

_kubeconf::known_configs() {
	if [[ ! -f "$KUBECONF_KNOWN_CONFIGS" ]]; then
		return
	fi

	cat "$KUBECONF_KNOWN_CONFIGS" | while read -r f; do
		if [[ -f "$f" ]]; then
			echo "$f"
		fi
	done
}

_kubeconf::known_config_names() {
	_kubeconf::known_configs | while read -r f; do
		echo "$(basename "$f")"
	done
}

_kubeconf::compgen() {
	local curr prev
	curr="${COMP_WORDS[COMP_CWORD]}"
	prev="${COMP_WORDS[COMP_CWORD-1]}"

	case "$COMP_CWORD" in
	1)
		COMPREPLY=( $(compgen -W "add use edit list" -- "$curr") )
		;;
	2)
		case "$prev" in
		a|add)
			COMPREPLY=( $(compgen -f -- "$curr") )
			;;
		u|use)
			COMPREPLY=( $(compgen -W "$(_kubeconf::known_config_names)" -- "$curr") )
			;;
		*)
			COMPREPLY=()
		esac
		;;
	esac
}

complete -F _kubeconf::compgen kubeconf