[bin] Add qrwifi script

bin/qrwifi

@@ -0,0 +1,35 @@
+#!/bin/sh
+ssid="${1:-}"
+if [ -z "$ssid" ]; then
+	ssid="$(wpa_cli status | rg -o --replace='$1' '^ssid=(.*)$')"
+fi
+if [ -z "$ssid" ]; then
+	echo "Not connected to a WiFi network via wpa_supplicant"
+	echo "Use $0 <ssid> [password]" to share another WiFi network
+	exit 1
+fi
+
+pw="${2:-}"
+if [ -z "$pw" ]; then
+	pw="$(sudo cat /etc/wpa_supplicant/wpa_supplicant.conf | sed -n '/^[\t ]*ssid="'"$ssid"'"$/{:findpsk;N;/\n[\t ]*psk=/!b findpsk;s/^\(\n\|.\)*[\t ]*psk="\(.*\)"$/\2/p; }')"
+fi
+if [ -z "$pw" ]; then
+	echo "Couldn't find password for network \`$ssid\`"
+	echo "Use $0 <ssid> <password>" to share a specific SSID and password
+	exit 1
+else
+	echo "Sharing network \`$ssid\`"
+fi
+
+if [ -z "$ssid" ] || [ -z "$pw" ]; then
+	echo "Missing SSID or password"
+	exit 1
+fi
+if printf '%s' "$pw" | grep -qF ';'; then
+	echo "Password contains ;, I didn't look up how to handle that case"
+	exit 1
+fi
+
+rm -f /tmp/qr.png
+printf '%s' "WIFI:T:WPA;S:$ssid;P:$pw;;" | qrencode -s 10 -o /tmp/qr.png
+nsxiv /tmp/qr.png