diff_tut_folders.bash

#!/usr/bin/env bash

# SPDX-License-Identifier: MIT OR Apache-2.0
#
# Copyright (c) 2018-2023 Andre Richter <andre.o.richter@gmail.com>

DIFF=$(
 diff -uNr \
 -x README.md \
 -x README.CN.md \
 -x README.ES.md \
 -x kernel8.img \
 -x Cargo.lock \
 -x target \
$1$2 \
| sed -r "s/[12][90][127][0-9]-[0-9][0-9]-[0-9][0-9] .*//g" \
| sed -r "s/[[:space:]]*$//g" \
| sed -r "s/%/modulo/g" \
| sed -r "s/diff -uNr -x README.md -x README.CN.md -x README.ES.md -x kernel8.img -x Cargo.lock -x target/\ndiff -uNr/g"
)

HEADER="## Diff to previous"
ORIGINAL=$(
 cat $2/README.md \
| sed -rn "/$HEADER/q;p"
)

echo"$ORIGINAL">"$2/README.md"
printf"\n$HEADER\n">>"$2/README.md"
printf"\`\`\`diff\n">>"$2/README.md"
echo"$DIFF">>"$2/README.md"
printf"\n\`\`\`\n">>"$2/README.md"