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A really fun vim oneliner for auto documenting your option's parsing in your script.
# print the text embeded in the case that parse options from command line.
# the block is matched with the marker 'CommandParse' in comment, until 'esac'
# use vim for parsing:
# 1st grep the case block and copy in register @p + unindent in the buffer of the file itself
# 2nd filter lines which start with --opt or +opt and keep comment on hte following lines until an empty line
# 3rd discard changes in the buffer and quit
vim -n -es -c 'g/# CommandParse/+2,/^\s\+esac/-1 d p | % d | put p | %
-c 'g/^\([-+]\+[^)]\+\))/,/^\(\s\+[^- \t#]\|^$\)/-1 p' \
-c 'q!' $0
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