# (C) 2010 magicant

# Completion script for the "tail" command.
# Supports POSIX 2008, GNU coreutils 8.6, FreeBSD 8.1, OpenBSD 4.8, NetBSD 5.0,
# Mac OS X 10.6.4, SunOS 5.10, HP-UX 11i v3.

function completion/tail {

	case $("${WORDS[1]}" --version 2>/dev/null) in
		(*'coreutils'*) typeset type=GNU ;;
		(*)             typeset type="$(uname 2>/dev/null)" ;;
	esac
	case $type in
		(GNU) typeset long=true ;;
		(*)   typeset long= ;;
	esac

	typeset OPTIONS ARGOPT PREFIX
	OPTIONS=( #>#
	"c: ${long:+--bytes:}; specify the number of bytes to print"
	"f; keep watching the file for more data"
	"n: ${long:+--lines:}; specify the number of lines to print"
	) #<#

	case $type in (*BSD|Darwin|SunOS)
		OPTIONS=("$OPTIONS" #>#
		"r; print lines in reverse order"
		) #<#
	esac
	case $type in (*BSD|Darwin|HP-UX)
		OPTIONS=("$OPTIONS" #>#
		"b:; specify the number of 512-byte blocks to print"
		) #<#
	esac
	case $type in (FreeBSD|NetBSD|Darwin)
		OPTIONS=("$OPTIONS" #>#
		"F; like -f, but reopen the file if renamed"
		) #<#
	esac
	case $type in (GNU|FreeBSD)
		OPTIONS=("$OPTIONS" #>#
		"q ${long:+--quiet --silent}; never print filename headers"
		) #<#
	esac
	case $type in (GNU)
		OPTIONS=("$OPTIONS" #>#
		"--follow::; specify how to watch the file for more data"
		"F; like --follow=name --retry"
		"--max-unchanged-stats:; recheck file status every n checks"
		"--pid:; specify the ID of a process to follow"
		"--retry; try to reopen the file if removed"
		"--sleep-interval:; specify the number of seconds to wait between checks for more data"
		"v --verbose; always print filename headers"
		"--help"
		"--version"
		) #<#
	esac

	command -f completion//parseoptions ${long:+-es}
	case $ARGOPT in
	(-)
		command -f completion//completeoptions
		;;
	([bcn]|--bytes|--lines)
		case $type in (GNU)
			if command -vf completion//prefixdigits >/dev/null 2>&1 ||
					. -AL completion/_blocksize; then
				if command -f completion//prefixdigits; then
					command -f completion//completesizesuffix b GNU
				fi
			fi
		esac
		;;
	(--follow) #>>#
		complete -P "$PREFIX" -D "never reopen the file" descriptor
		complete -P "$PREFIX" -D "reopen the file when renamed/removed" name
		;; #<<#
	(--pid)
		typeset pid args
		while read -r pid args; do
			complete -P "$PREFIX" -D "$args" -- "$pid"
		done <(ps -A -o pid= -o args= 2>/dev/null)
		;;
	('')
		complete -f
		;;
	esac

}


# vim: set ft=sh ts=8 sts=8 sw=8 noet:
