From 210978ab8f19229f9e3c07f4cfbb2567c6d620ad Mon Sep 17 00:00:00 2001
From: Fernando Schauenburg <dev@schauenburg.me>
Date: Wed, 28 Sep 2022 13:02:49 +0200
Subject: [PATCH] env: only set DISPLAY on WSL if an Xserver is reachable

Neovim always uses `xclip` as the clipboard provider if DISPLAY is set.
Therefore, if we set it unconditionally, `xclip` hangs while trying to
reach the server if this hasn't been started, causing all sorts of
chaos.
---
 home/.zshenv | 14 ++++++++++----
 1 file changed, 10 insertions(+), 4 deletions(-)

diff --git a/home/.zshenv b/home/.zshenv
index 1804103..88dbe9e 100644
--- a/home/.zshenv
+++ b/home/.zshenv
@@ -48,12 +48,18 @@ export ZDOTDIR="$XDG_CONFIG_HOME/zsh"
 #
 [ "$(uname -s)" = "Darwin" ] || source "$XDG_CONFIG_HOME/shell/path.sh"
 
-# Set $DISPLAY if running in WSL
+# Set $DISPLAY if running in WSL and an Xserver is reachable
 #
 # How to configure Windows Firewall for Xserver: https://skeptric.com/wsl2-xserver/
 # How to check if running in WSL: https://stackoverflow.com/a/61014411
-if [ $(uname -r | sed -n 's/.*\( *Microsoft *\).*/\1/ip') ]; then
-  export DISPLAY=$(awk '/nameserver/ {print $2; exit}' /etc/resolv.conf 2>/dev/null):0.0
-  export LIBGL_ALWAYS_INDIRECT=1
+if [ -n "$(uname -r | sed -n 's/.*\( *Microsoft *\).*/\1/ip')" ]; then
+  xdisplay="$(awk '/nameserver/ {print $2; exit}' /etc/resolv.conf 2>/dev/null):0.0"
+  if command -v xset >/dev/null 2>&1; then
+    if DISPLAY="$xdisplay" timeout '0.2s' xset q >/dev/null 2>&1; then
+      export DISPLAY="$xdisplay"
+      export LIBGL_ALWAYS_INDIRECT=1
+    fi
+  fi
+  unset xdisplay
 fi