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# This function downloads and normalizes a patch/diff file.
# This is primarily useful for dynamically generated patches,
# such as GitHub's or cgit's, where the non-significant content parts
# often change with updating of git or cgit.
# stripLen acts as the -p parameter when applying a patch.
{ lib, fetchurl, patchutils }:
{ stripLen ? 0, addPrefixes ? false, ... }@args:
fetchurl ({
postFetch = ''
tmpfile="$TMPDIR/${args.sha256}"
"${patchutils}/bin/lsdiff" "$out" \
| sort -u | sed -e 's/[*?]/\\&/g' \
| xargs -I{} \
"${patchutils}/bin/filterdiff" \
--include={} \
--strip=${toString stripLen} \
${lib.optionalString addPrefixes ''
--addoldprefix=a/ \
--addnewprefix=b/ \
''} \
--clean "$out" > "$tmpfile"
mv "$tmpfile" "$out"
${args.postFetch or ""}
'';
} // builtins.removeAttrs args ["stripLen" "addPrefixes"])