Add support for blesh (#267)

* Fix intendation

* Add support for blesh

See https://github.com/akinomyoga/ble.sh/wiki/Manual-%C2%A71-Introduction#user-content-fn-blehook for more details

src/shell/atuin.bash

@@ -11,7 +11,6 @@ _atuin_precmd() {
 
     [[ -z "${ATUIN_HISTORY_ID}" ]] && return
 
-
     (RUST_LOG=error atuin history end "$ATUIN_HISTORY_ID" --exit $EXIT &) > /dev/null 2>&1
 }
 
@@ -27,8 +26,13 @@ __atuin_history ()
 }
 
 
-preexec_functions+=(_atuin_preexec)
+if [[ -v BLE_VERSION ]]; then
+    blehook PRECMD+=_atuin_precmd
+    blehook PREEXEC+=_atuin_preexec
+else
     precmd_functions+=(_atuin_precmd)
+    preexec_functions+=(_atuin_preexec)
+fi
 
 if [[ -z $ATUIN_NOBIND ]]; then
     bind -x '"\C-r": __atuin_history'