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{ pkgs, writeExecline, getBins }:
let
# split
bins = getBins pkgs.coreutils [ "split" "mktemp" "rm" "rmdir" ]
// getBins pkgs.lr [ "lr" ]
// getBins pkgs.xe [ "xe" ]
// getBins pkgs.qrencode [ "qrencode" ]
// getBins pkgs.zbar [ "zbarimg" ]
// getBins pkgs.sane-backends [ "scanimg" ];
qr-code-props = {
# second highest redundancy level
level = "Q";
# max amount of bytes that level Q can encode
bytes = "1700";
};
# Takes a private GPG key encoded with paperkey on stdin
# and execs into the argv for each qr code image (on stdin).
print-qr-codes = writeExecline "print-qr-codes" {} [
split-stdin
"pipeline" [
bins.qrencode
"--level=${qr-code-props.level}"
"--dpi=300"
"-o-"
]
"$@"
];
split-stdin = pkgs.writers.writePython3 "split-stdin" {} ''
import sys
import subprocess
while True:
str = sys.stdin.buffer.read(${qr-code-props.bytes})
if str == "":
break
ret = subprocess.run(sys.argv[1:], input=str)
code = ret.returncode
if code != 0:
sys.exit(code if code > 0 else 128 - code)
'';
test = writeExecline "test12" {} [
"foreground" [ print-qr-codes "feh" "-" ]
];
# scanning:
# for i in (seq 0 9); scanimage --device=\'fujitsu:ScanSnap iX500:1527308\' --mode=gray --resolution=100 --format=png | zbarimg -Sdisable -Sqrcode.enable --raw - | head --bytes=-1; end > out
in {
inherit print-qr-codes;
}
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