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#compdef lsof

local curcontext="$curcontext" state line expl fields args alts suf hsuf pref ret=1

case $OSTYPE in
  linux*) args=( '-X[skip reporting of info on network connections]' ) ;;
  solaris*)
    args=(
      '-X[include deleted files]'
      '-z[zone information]::zone:_zones'
    )
  ;;
esac

_arguments -C -s -S $args \
  '(-)'{-\?,-h}'[list help]' \
  '-a[AND selections]' \
  '-b[avoid kernel blocks]' \
  '-C[disable reporting of path name components]' \
  '+c[truncate command name to specified characters]:characters' \
  '-c[list files with specified command name beginning]:command name' \
  '+d[search for open instances for contents of specified dir]:search directory:_files -/' \
  '-d[specify list of file descriptors to exclude/include]:file descriptors:->filedes' \
  '+D[recursively search from specified dir]:search directory:_files -/' \
  '-D[direct use of device cache file]:function:((\?\:report\ device\ cache\ file\ paths b\:build\ the\ device\ cache\ file i\:ignore\ the\ device\ cache\ file r\:read\ the\ device\ cache\ file u\:read\ and\ update\ the\ device\ cache\ file))' \
  '*-+e[exempt filesystem from blocking kernel calls]:file system:_directories' \
  '-f[inhibit listing of kernel file structure info]::info type or path:(c f g G n)' \
  '+f[enable listing of kernel file structure info]::info type:(c f g G n)' \
  '-F[select output fields]:fields:->fields' \
  '-g[select by process group id]::process group id' \
  '(*)*-i[select internet files]::address:->addresses' \
  '-K+[select listing of tasks of processes]::value:((i\:ignore\ tasks))' \
  '-k[specify kernel name list file]:kernel file:_files' \
  '-l[inhibit conversion of UIDs to user names]' \
  '-L[list no link counts]' \
  '+L[list all link counts]::max link count for listed files' \
  '-m[specify kernel memory file]:kernel memory file:_files' \
  '-M[disable reporting of portmapper registrations]' \
  '+M[enable reporting of portmapper registrations]' \
  '-n[inhibit conversion of network numbers to hostnames]' \
  '-N[select listing of NFS files]' \
  '(-s)-o[list file offset]::digits for file offset' \
  '-O[avoid overheads of bypassing potential blocking]' \
  '-P[inhibit conversion of port numbers to port names]' \
  '-p[list files for specified processes]:process ID:_sequence -s , _pids' \
  '-r[repeat listing endlessly]::delay (seconds)' \
  '+r[repeat listing until no files listed]::delay (seconds)' \
  '-R[list parent PID]' \
  '(-o)-s+[list file size or exclude TCP/UDP files by state]::state:->states' \
  '-S[specify timeout for kernel functions that might deadlock]:timeout (seconds)' \
  '-T[select reporting of TCP/TPI info]::info type:((q\:queue\ length\ reporting s\:state\ reporting w\:window\ size\ reporting))' \
  '(+w -w)-t[terse output]' \
  '-u[list files owned by specified users]:user:_users -S,' \
  '-U[list Unix domain socket files]' \
  '(-)-v[list version info]' \
  '-V[indicate unsuccessfully searched for items]' \
  '(-t)+w[suppress warnings]' \
  '(-t)-w[enable warnings]' \
  '-x[cross filesystems/traverse symlinks with +d/+D]::type:((f\:filesystems s\:symlinks))' \
  '*:file:_files' && ret=0

case $state in
  addresses)
    if compset -P 1 '*:'; then
      _ports && ret=0
    else
      if compset -P 1 '*@'; then
        pref=()
      else
        pref=( -P @ )
        suf=( -qS @ )
        [[ $PREFIX = (#i)(4|6|tcp|udp)* ]] || alts=( 'ip-versions:IP version:(4 6)' )
        compset -P '[46]'
        alts+=( 'protocols:protocol:compadd $suf -M 'm:{a-z}={A-Z}' TCP UDP' )
      fi
      if compset -S '@*'; then
        suf=()
      else
        hsuf=( -qS : )
        compset -S ':*' && hsuf=()
        alts+=( "hosts:host:_hosts $pref $hsuf" )
      fi

      _alternative $alts && ret=0
    fi
  ;;
  fields)
    fields=( ${${${${(f)"$($words[1] -F \? 2>&1)"}[2,-1]#??}//  ##/:}:#(#s)[${PREFIX:-:}]:*} )
    compset -P '*'
    _describe -t fields "field" fields -S '' && ret=0
  ;;
  filedes)
    _sequence -s , _wanted -x file-descriptors expl "file descriptor" compadd - \
        cwd err jld ltz mem mmap pd rtd tr txt v86 && ret=0
  ;;
  states)
    if compset -P 1 '*:'; then
      _sequence _wanted states expl state compadd - -M 'm:{a-z}={A-Z}' \
          CLOSED IDLE BOUND LISTEN ESTABLISHED SYN_SENT SYN_RCDV ESTABLISHED \
          CLOSE_WAIT FIN_WAIT1 CLOSING LAST_ACK FIN_WAIT_2 TIME_WAIT && ret=0
    else
      compset -S ':*' || suf=( -qS : )
      _wanted protocols expl protocol compadd $suf -M 'm:{a-z}={A-Z}' TCP UDP && ret=0
    fi
  ;;
esac

return ret