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nano-7.2/syntax/groff.nanorc

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## Syntax highlighting for groff.
syntax groff "\.(m[ems]|rof|tmac)$|/tmac\.[^/]+$"
comment ".\""
# The setting of a string or register
color cyan "^\.(ds|nr) [^[:space:]]*"
# Single-character escapes
color brightmagenta "\\."
# The argument of \f or \s in the same color
color brightmagenta "\\f(.|\(..)|\\s(\+|\-)?[0-9]"
# References to registers
color cyan "\\(\\)?n(.|\(..)"
color cyan start="\\(\\)?n\[" end="]"
# Requests
color brightgreen "^\.[[:blank:]]*[^[:space:]]*"
# Comments
color yellow "^\.\\".*"
# References to strings
color green "\\(\\)?\*(.|\(..)"
color green start="\\(\\)?\*\[" end="]"
# Special characters
color brightred "\\\(.."
color brightred start="\\\[" end="]"
# Macro arguments
color brightcyan "\\\\\$[1-9]"