fish-shell/share/functions/__fish_complete_grep.fish

function __fish_complete_grep -d 'Complete grep, egrep, fgrep, rgrep' --argument-names grep
        complete -c $grep -s A -l after-context --description "Print NUM lines of trailing context"
        complete -c $grep -s a -l text --description "Process binary file as text"
        complete -c $grep -s B -l before-context --description "Print NUM lines of leading context"
        complete -c $grep -s C -l context --description "Print NUM lines of context"
        complete -c $grep -s b -l byte-offset --description "Print byte offset of matches"
        complete -c $grep -l binary-files --description "Assume data type for binary files" -x -a "binary text"
        complete -c $grep -l colour -x -a "never always auto"
        complete -c $grep -l color -x -a "never always auto"
        complete -c $grep -s c -l count --description "Only print number of matches"
        complete -c $grep -s D -l devices -x -a "read skip" --description "Action for devices"
        complete -c $grep -s d -l directories -x -a "read skip recurse" --description "Action for directories"
        complete -c $grep -s E -l extended-regexp --description "Pattern is extended regexp"
        complete -xc $grep -s e -l regexp --description "Pattern is a regexp"
        complete -rc $grep -l exclude-from --description "Read pattern list from file. Skip files whose base name matches list"
        complete -rc $grep -l exclude-dir --description "Exclude matching directories from recursive searches"
        complete -c $grep -s F -l fixed-strings --description "Pattern is a fixed string"
        complete -rc $grep -s f -l file -r --description "Use patterns from a file"
        complete -c $grep -s G -l basic-regexp --description "Pattern is basic regex"
        complete -c $grep -s H -l with-filename --description "Print filename"
        complete -c $grep -s h -l no-filename --description "Suppress printing filename"
        complete -c $grep -l help --description "Display help and exit"
        complete -c $grep -s I --description "Skip binary files"
        complete -c $grep -s i -l ignore-case --description "Ignore case"
        complete -c $grep -s L -l files-without-match --description "Print first non-matching file"
        complete -c $grep -s l -l files-with-match --description "Print first matching file"
        complete -c $grep -s m -l max-count --description "Stop reading after NUM matches"
        complete -c $grep -l mmap --description "Use the mmap system call to read input"
        complete -c $grep -s n -l line-number --description "Print line number"
        complete -c $grep -s o -l only-matching --description "Show only matching part"
        complete -c $grep -l label --description "Rename stdin"
        complete -c $grep -l line-buffered --description "Use line buffering"
        complete -c $grep -s P -l perl-regexp --description "Pattern is a Perl regexp (PCRE) string"
        complete -c $grep -s q -l quiet --description "Do not write anything"
        complete -c $grep -l silent --description "Do not write anything"
        complete -c $grep -s R -l recursive --description "Read files under each directory, recursively"
        complete -c $grep -s r --description "Read files under each directory, recursively"
        complete -c $grep -l include --description "Search only files matching PATTERN"
        complete -c $grep -l exclude --description "Skip files matching PATTERN"
        complete -c $grep -s s -l no-messages --description "Suppress error messages"
        complete -c $grep -s T -l initial-tab  --description "Ensure first character of actual line content lies on a tab stop"
        complete -c $grep -s U -l binary --description "Treat files as binary"
        complete -c $grep -s u -l unix-byte-offsets --description "Report Unix-style byte offsets"
        complete -c $grep -s V -l version --description "Display version and exit"
        complete -c $grep -s v -l invert-match --description "Invert the sense of matching"
        complete -c $grep -s w -l word-regexp --description "Only whole matching words"
        complete -c $grep -s x -l line-regexp --description "Only whole matching lines"
        complete -c $grep -s y --description "Obsolete synonym for -i"
        complete -c $grep -s z -l null-data --description 'treat input as a set of lines each terminated by a zero byte'
        complete -c $grep -s Z -l null --description "Output a zero byte after filename"
end