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Improve startup time drasticaly by caching to disk #109

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Improve startup time drasticaly by caching to disk #109

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18 changes: 18 additions & 0 deletions kube-ps1.sh
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Original file line number Diff line number Diff line change
Expand Up @@ -41,6 +41,7 @@ KUBE_PS1_DISABLE_PATH="${HOME}/.kube/kube-ps1/disabled"
KUBE_PS1_LAST_TIME=0
KUBE_PS1_CLUSTER_FUNCTION="${KUBE_PS1_CLUSTER_FUNCTION}"
KUBE_PS1_NAMESPACE_FUNCTION="${KUBE_PS1_NAMESPACE_FUNCTION}"
KUBE_PS1_ENV_CACHEFILE="${HOME}/.kube-ps1.envs"

# Determine our shell
if [ "${ZSH_VERSION-}" ]; then
Expand All @@ -63,6 +64,7 @@ _kube_ps1_init() {
add-zsh-hook precmd _kube_ps1_update_cache
zmodload -F zsh/stat b:zstat
zmodload zsh/datetime
_kube_load_vars_from_file
;;
"bash")
_KUBE_PS1_OPEN_ESC=$'\001'
Expand All @@ -74,6 +76,20 @@ _kube_ps1_init() {
esac
}

_kube_load_vars_from_file() {
if test -f "$KUBE_PS1_ENV_CACHEFILE"; then
source "$KUBE_PS1_ENV_CACHEFILE"
fi
}

_kube_ps1_update_cachefile() {
# Cache has been updated, write to file.
echo "KUBE_PS1_CONTEXT=$KUBE_PS1_CONTEXT" > $KUBE_PS1_ENV_CACHEFILE
echo "KUBE_PS1_KUBECONFIG_CACHE=$KUBE_PS1_KUBECONFIG_CACHE" >> $KUBE_PS1_ENV_CACHEFILE
echo "KUBE_PS1_LAST_TIME=$KUBE_PS1_LAST_TIME" >> $KUBE_PS1_ENV_CACHEFILE
echo "KUBE_PS1_NAMESPACE=$KUBE_PS1_NAMESPACE" >> $KUBE_PS1_ENV_CACHEFILE
}

_kube_ps1_color_fg() {
local KUBE_PS1_FG_CODE
case "${1}" in
Expand Down Expand Up @@ -212,6 +228,7 @@ _kube_ps1_update_cache() {
# User changed KUBECONFIG; unconditionally refetch.
KUBE_PS1_KUBECONFIG_CACHE=${KUBECONFIG}
_kube_ps1_get_context_ns
_kube_ps1_update_cachefile
return
fi

Expand All @@ -222,6 +239,7 @@ _kube_ps1_update_cache() {
[[ -r "${conf}" ]] || continue
if _kube_ps1_file_newer_than "${conf}" "${KUBE_PS1_LAST_TIME}"; then
_kube_ps1_get_context_ns
_kube_ps1_update_cachefile
return
fi
done
Expand Down