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# only modify new lines
/^+/ {
# remove diff-style + line prefix
s/^+//
# remove trailing whitespace
s/[[:space:]]*$//
# replace 8 spaces at the beginning of a line with a single tab
s/^ / /
# remove 1-7 spaces at the beginning of a line if they are followed by
# a tab (which would hide them in the resulting layout)
s/^ \{1,7\} / /
:spacestotab
# replace 8 tab-aligned spaces with a single tab
s/ / /
t spacestotab
:removespaces
# remove 1-7 tab-aligned spaces if they are followed by a tab (which
# would hide them in the resulting layout)
s/ \{1,7\} / /
t removespaces
:tabtospaces
# replace non-leading tabs with spaces (except for trailing tabs in
# macros) to make reindentation easier
s/^\( *\([^ ]\{8\}\)*[^ ]\{8\}\) \(.*[^\\]\)$/\1 \3/
s/^\( *\([^ ]\{8\}\)*[^ ]\{1\}\) \(.*[^\\]\)$/\1 \3/
s/^\( *\([^ ]\{8\}\)*[^ ]\{2\}\) \(.*[^\\]\)$/\1 \3/
s/^\( *\([^ ]\{8\}\)*[^ ]\{3\}\) \(.*[^\\]\)$/\1 \3/
s/^\( *\([^ ]\{8\}\)*[^ ]\{4\}\) \(.*[^\\]\)$/\1 \3/
s/^\( *\([^ ]\{8\}\)*[^ ]\{5\}\) \(.*[^\\]\)$/\1 \3/
s/^\( *\([^ ]\{8\}\)*[^ ]\{6\}\) \(.*[^\\]\)$/\1 \3/
s/^\( *\([^ ]\{8\}\)*[^ ]\{7\}\) \(.*[^\\]\)$/\1 \3/
s/^\( *\([^ ]\{8\}\)*[^ ]\{8\}\) \(.*[^ ].*\\\)$/\1 \3/
s/^\( *\([^ ]\{8\}\)*[^ ]\{1\}\) \(.*[^ ].*\\\)$/\1 \3/
s/^\( *\([^ ]\{8\}\)*[^ ]\{2\}\) \(.*[^ ].*\\\)$/\1 \3/
s/^\( *\([^ ]\{8\}\)*[^ ]\{3\}\) \(.*[^ ].*\\\)$/\1 \3/
s/^\( *\([^ ]\{8\}\)*[^ ]\{4\}\) \(.*[^ ].*\\\)$/\1 \3/
s/^\( *\([^ ]\{8\}\)*[^ ]\{5\}\) \(.*[^ ].*\\\)$/\1 \3/
s/^\( *\([^ ]\{8\}\)*[^ ]\{6\}\) \(.*[^ ].*\\\)$/\1 \3/
s/^\( *\([^ ]\{8\}\)*[^ ]\{7\}\) \(.*[^ ].*\\\)$/\1 \3/
t tabtospaces
# restore diff-style + line prefix
s/^/+/
}
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