/usr/share/mc/examples/macros.d/macro.4.sh is in mc-data 3:4.8.19-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | #silent
t Indent `C' formatter
indent -gnu -fc1 -i4 -bli0 -nut -bap -l100 %b 1>/dev/null 2> %e
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