local/bin/homeinit: Use MAIL_CACHE variable.

.local/bin/homeinit

@@ -15,6 +15,8 @@ SUBSTITUTE_URLS=https://ci.guix.gnu.org
 [ -z "$XDG_CONFIG_HOME" ] && XDG_CONFIG_HOME="$HOME/.config"
 [ -z "$XDG_DATA_HOME" ] && XDG_DATA_HOME="$HOME/.local/share"
 [ -z "$XDG_BIN_HOME" ] && XDG_BIN_HOME="$XDG_DATA_HOME/../bin"
+## Hardcoded in .mbsyncrc:
+MAIL_CACHE="$HOME/.cache/mail"
 
 usage() {
 	cat <<EOF>&2
@@ -36,6 +38,8 @@ Environment variables:
   XDG_DATA_HOME=$XDG_DATA_HOME
   XDG_BIN_HOME=$XDG_BIN_HOME
 
+Tip: Copy the email cache to '$MAIL_CACHE' to speed up the process.
+
 Direct link:
 
   ${HTTPS_ROOT}ambrevar/dotfiles/raw/master/.local/bin/homeinit
@@ -179,7 +183,7 @@ else
 fi
 
 section "Persistent folders"
-for i in .cache/mail .config .config/guix .config/transmission-daemon .emacs.d "$XDG_DATA_HOME" .mpv projects; do
+for i in "$MAIL_CACHE" .config .config/guix .config/transmission-daemon .emacs.d "$XDG_DATA_HOME" .mpv projects; do
 	mkdir -pv "$HOME/$i"
 done
 
@@ -347,7 +351,7 @@ fi
 
 section "Mail"
 # lnn "$SOURCEDIR/mail/authinfo.gpg" "$HOME/.authinfo.gpg" ## Only if not using password-store.
-mkdir -pv "$HOME/.cache/mail/"
+mkdir -pv "$MAIL_CACHE"
 while IFS= read -r i; do
 	## Warning: We need to eval here to expand the "~".
 	mkdir -pv $(eval echo $i)
@@ -357,6 +361,6 @@ EOF
 
 if $OPT_UPDATE; then
 	mbsync -aV
-	# mu index --maildir=~/.cache/mail
+	# mu index --maildir="$MAIL_CACHE"
 	notmuch new
 fi