ensure go completion works well with goenv

completion/available/go.completion.bash

@@ -1,13 +1,15 @@
-#!/usr/bin/env bash
+# shellcheck shell=bash
+about-completion "completion for go command using gocomplete"
 
 # bash completion for go tool
 # https://github.com/posener/complete
-# https://pkg.go.dev/github.com/posener/complete?tab=doc
 
-# Install gocomplete:
-# go get -u github.com/posener/complete/gocomplete
-# gocomplete -install
-
-if _command_exists gocomplete && _command_exists go ; then
-  complete -C "${GOBIN}"/gocomplete go
+# Test `go version` because goenv creates shim scripts that will be found in PATH
+# but do not always resolve to a working install.
+if _command_exists go && go version &> /dev/null; then
+	# Same idea here, but no need to test a subcommand
+	if _command_exists gocomplete && gocomplete &> /dev/null; then
+		# finally, apply completion
+		complete -C gocomplete go
+	fi
 fi