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#compdef grep egrep fgrep -value-,GREP_OPTIONS,-default-
# Ulrik Haugen 2001

local arguments matchers command

if [[ $service = *GREP_OPT* ]]; then
  compset -q
  words=( fake "$words[@]" )
  (( CURRENT++ ))
  command=grep
else
  arguments=(
    '(-e --regexp -f --file)1: :_guard "^--*" pattern'
    '*:files:_files'
  )
  command="$words[1]"
fi

if [[ $service != [ef]grep ]]; then
  matchers='(--extended-regexp --fixed-strings --basic-regexp --perl-regexp -E -F -G -P)'
  arguments+=(
    $matchers{--extended-regexp,-E}'[use extended regular expression]'
    $matchers{--fixed-strings,-F}'[use literal strings]'
    $matchers{--basic-regexp,-G}'[use basic regular expression]'
    $matchers{--perl-regexp,-P}'[use perl regular expression]'
  )
fi

arguments=( $arguments[@]
  '(--after-context -A)'{--after-context=,-A+}'[specify lines of trailing context]:lines'
  '(--text -a --binary-files -I)'{--text,-a}'[process binary file as if it were text]'
  '(--before-context -B)'{--before-context=,-B+}'[specify lines of leading context]:lines'
  '(--context,-C)'{--context=,-C-}'[specify lines of context]:lines'
  '(--color --colour)--'{color,colour}'=-[distinguish matching string]::when:(always never auto)'
  '(--byte-offset -b -c)'{--byte-offset,-b}'[print the byte offset with output lines]'
  '(--text -a -I)--binary-files=[specify type to assume for binary files]:file type:(binary without-match text)'
  '(--count -c --byte-offset -b --line-number -n)'{--count,-c}'[only print a count of matching lines]'
  '(--directories -d -r --recursive)'{--directories=,-d+}'[specify handling of directories]:action on directory:(read skip recurse)'
  '(--devices -D)'{--devices=,-D+}'[specify handling of devices, FIFOs and sockets]:action on device:(read skip)'
  '(1)*'{--regexp=,-e+}'[specify pattern]:pattern'
  '(1)*'{--file=,-f+}'[specify pattern file]:file:_files'
  '(--with-filename -H --no-filename -h)'{--with-filename,-H}'[print filename with each match]'
  '(--no-filename -h --with-filename -H --null -Z --files-without-match -L --file-with-matches -l)'{--no-filename,-h}'[suppress printing of filenames]'
  '--label=[provide filename to print for stdin]:filename label for stdin'
  '--line-buffered[flush output on every line]'
  '(--text -a --binary-files)-I[process binary files as if non-matching]'
  '(--ignore-case -i -y)'{--ignore-case,-i,-y}'[case-insensitive]'
  '(--files-without-match -L --file-with-matches -l --no-filename -h)'{--files-without-match,-L}"[output non-matching files' names only]"
  '(--files-with-matches -l --files-without-match -L --no-filename -h)'{--files-with-matches,-l}"[output matching files' names only]"
  '(--max-count -m)'{--max-count=,-m+}'[stop after specified no of matches]:max number of matches'
  '(--line-number -n -c)'{--line-number,-n}'[prefix output with line numbers]'
  '(--only-matching -o)'{--only-matching,-o}'[show only matching part of line]'
  '(--quiet --silent -q)'{--quiet,--silent,-q}'[suppress normal output]'
  '(--recursive -r -R -d --directories)'{--recursive,-r,-R}'[recurse subdirectories]'
  '*--include=[examine files matching specified pattern]:file pattern'
  '*--exclude=[skip files matching specified pattern]:file pattern'
  '*--exclude-from=[skip files matching pattern in specified file]:file:_files'
  '*--exclude-dir=[skip directories matching specified pattern]:directory pattern'
  '(--no-messages -s)'{--no-messages,-s}'[suppress messages about unreadable]'
  '(--version -V)'{--version,-V}'[display version info]'
  '(--invert-match -v)'{--invert-match,-v}'[select non-matching lines]'
  '(--word-regexp -w --line-regexp -x)'{--word-regexp,-w}'[force pattern to match only whole words]'
  '(--line-regexp -x --word-regexp -w)'{--line-regexp,-x}'[force pattern to match only whole lines]'
  '(--null -Z --no-filename -h)'{--null,-Z}'[print 0 byte after FILE name]'
  '--help[display help]'
  '--mmap[memory map input]'
)

# remove long options?
_pick_variant -c "$command" gnu=gnu unix --help ||
    arguments=( ${arguments:#(|*\)(\*|))--*} )

_arguments -S -s $arguments[@]

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