add wifi-pass utility

templates/bin/wifi-pass

@@ -0,0 +1,46 @@
+#!/usr/bin/env python
+
+import argparse
+from io import StringIO
+import subprocess
+import urllib.parse
+
+
+def main():
+    parser = argparse.ArgumentParser(
+        description="""
+            Fetch the wifi password and generate a QR code.
+
+            This program assumes that the network PSK is stored
+            in the password-store, and will look for it
+            at the path `wifi/<essid>`.
+        """,
+    )
+    parser.add_argument(
+        "-H",
+        "--hidden",
+        action="store_true",
+        help="Indicate that this network's SSID is hidden.",
+    )
+    parser.add_argument("essid", help="ESSID for this network")
+
+    args = parser.parse_args()
+
+    psk = subprocess.check_output(["pass", f"wifi/{args.essid}"], text=True).strip()
+
+    hidden_data = "H:true;" if args.hidden else ""
+    qr_data = f"WIFI:T:WPA;S:{quote(args.essid)};{hidden_data}P:{quote(psk)};;"
+
+    proc = subprocess.Popen(["qrencode", "-tANSI"], stdin=subprocess.PIPE, text=True)
+    proc.communicate(qr_data)
+
+
+PRINTABLE = [*range(0x20, 0x3B), *range(0x3C, 0x7F)]
+
+
+def quote(s: str) -> str:
+    return urllib.parse.quote(s, safe=PRINTABLE)
+
+
+if __name__ == "__main__":
+    main()