From e051fecf9c19d446d6588bd21070fd1a799b97a3 Mon Sep 17 00:00:00 2001
From: tv <tv@krebsco.de>
Date: Wed, 17 Apr 2019 21:49:43 +0200
Subject: qrscan: init

---
 krebs/5pkgs/simple/qrscan.nix | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)
 create mode 100644 krebs/5pkgs/simple/qrscan.nix

diff --git a/krebs/5pkgs/simple/qrscan.nix b/krebs/5pkgs/simple/qrscan.nix
new file mode 100644
index 00000000..7d99dcee
--- /dev/null
+++ b/krebs/5pkgs/simple/qrscan.nix
@@ -0,0 +1,27 @@
+{ coreutils, gnused, writeDashBin, zbar }:
+
+writeDashBin "qrscan" ''
+  set -efu
+
+  tmpdir=$(${coreutils}/bin/mktemp --tmpdir -d qrscan.XXXXXXXX)
+  codefile=$tmpdir/code
+
+  cleanup() {
+    ${coreutils}/bin/rm "$codefile"
+    ${coreutils}/bin/rmdir "$tmpdir"
+  }
+
+  ${coreutils}/bin/mkfifo "$codefile"
+
+  ${zbar}/bin/zbarcam > "$codefile" &
+  zbarcampid=$!
+
+  exec < "$codefile"
+  while read -r code; do
+    code=$(printf %s "$code" | ${gnused}/bin/sed -n 's/^QR-Code://p')
+    if test -n "$code"; then
+      ${coreutils}/bin/kill "$zbarcampid"
+      echo "$code"
+    fi
+  done
+''
-- 
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