Adapted Valodim's capture completion script to

implement a simple completion service

completion-service.zsh

@@ -0,0 +1,28 @@
+#!/bin/zsh
+# Based on:
+# https://github.com/Valodim/zsh-capture-completion/blob/master/capture.zsh
+
+zmodload zsh/zpty
+setopt noglob
+
+zpty z ZLE_DISABLE_AUTOSUGGEST=1 zsh -i
+
+# Source the init script
+zpty -w z "source '${0:a:h}/completion-service-init.zsh'"
+
+read-to-null() {
+	while zpty -r z chunk; do
+		[[ $chunk == *$'\0'* ]] && break
+		print -n $chunk
+	done
+}
+
+# wait for ok from shell
+read-to-null &> /dev/null
+
+while read prefix &> /dev/null; do
+	zpty -w -n z $prefix$'\t'
+	zpty -r z chunk &> /dev/null # read empty line before completions
+	read-to-null
+	zpty -w z $'\n'
+done