#!/usr/bin/env build

build_fetch_p4()
{
	if ! p4 client -o > /dev/null 2>&1; then
		die 'p4 client not logged in'
	fi

	build_fetch_p4_uri="$(build-url --base "${1}")"
	build_fetch_p4_uri="${build_fetch_p4_uri%%\?*}"
	build_fetch_p4_uri="${build_fetch_p4_uri##p4://}"
	build_fetch_p4_var=
	build_fetch_p4_change=

	# FIXME ignore the server if specified?  The core problem here is that
	# p4 seems to have no way to specify what server you pull from.  It
	# generally assumes that the p4 client only has a single local server.
	# So specifying any such server (usually named 'perforce') is
	# fundementally a waste.
	if test "${build_fetch_p4_uri#/}" = "${build_fetch_p4_uri}"; then
		build_fetch_p4_uri="/${build_fetch_p4_uri#*/}"
	fi

	for arg in $(build-url --arg "${1}"); do
		case "${arg}" in
		(archive=*) build_fetch_p4_var="${arg##*=}";;
		(change=*) build_fetch_p4_change="@${arg##*=}";;
		esac
	done

	if test -z "${build_fetch_p4_var}"; then
		die "do not know how to store source from '${1}'"
	fi

	build_fetch_p4_dir="${build_fetch_p4_var%%.t*}"
	build_fetch_p4_tmp="$(mktemp -d "${BUILDER_TMPDIR}/${build_fetch_p4_dir}.XXXXXX")"
	BUILD_FETCH_CLEAN="${BUILD_FETCH_CLEAN} ${build_fetch_p4_tmp}"

	# We do not really know what sort of directory tree we are getting from
	# Perforce, so put it all into our archive directory and leave the
	# burden of sorting the mess to any Buildrules which pull from p4://
	mkdir -p "${build_fetch_p4_tmp}/${build_fetch_p4_dir}"
	cd "${build_fetch_p4_tmp}/${build_fetch_p4_dir}"
	p4 files "/${build_fetch_p4_uri}/...${build_fetch_p4_change}" | \
			while read build_fetch_p4_line; do
		# Parse the file type off the end of the line
		build_fetch_p4_type="${build_fetch_p4_line##* (}"
		build_fetch_p4_type="${build_fetch_p4_type%)}"
		build_fetch_p4_line="${build_fetch_p4_line%% (*}"

		# Parse the last changeset for the file
		build_fetch_p4_last="${build_fetch_p4_line##*change }"
		build_fetch_p4_line="${build_fetch_p4_line% change *}"

		# add/delete/edit action
		build_fetch_p4_action="${build_fetch_p4_line##* - }"
		build_fetch_p4_line="${build_fetch_p4_line% - *}"

		# File revision
		build_fetch_p4_rev="${build_fetch_p4_line##*#}"
		build_fetch_p4_line="${build_fetch_p4_line%%#*}"

		# File name
		build_fetch_p4_remote="${build_fetch_p4_line}"
		build_fetch_p4_local="${build_fetch_p4_line#//}"

		if test "${build_fetch_p4_remote}" != "//${build_fetch_p4_local}"; then
			die "parsing '${build_fetch_p4_line}'"
		fi

		# Append the @change number, if any
		build_fetch_p4_remote="${build_fetch_p4_remote}${build_fetch_p4_change}"

		# Figure out the mode of the file we should checkout as
		mode='0644'
		case "${build_fetch_p4_type}" in
		(*+x|*+wx|*+xw|xtext|kxtext|xbinary) mode='0755';;
		(text|ktext|text+w);;
		(symlink);;
		(binary|ubinary|apple);;
		(*) die "unknown filetype '${build_fetch_p4_type}'";;
		esac

		# Don't create deleted files
		case "${build_fetch_p4_action}" in
		(delete|move/delete) continue;;
		(add|move/add);;
		(edit|integrate|branch);;
		(*) die "unknown action '${build_fetch_p4_action}'";;
		esac

		if test -f "${build_fetch_p4_local}"; then
			die "${build_fetch_p4_action} existing file '${build_fetch_p4_local}'"
		fi

		mkdir -p "${build_fetch_p4_local%/*}"
		p4 print -q -o "${PWD}/${build_fetch_p4_local}" "${build_fetch_p4_remote}"
		if ! test -f "${build_fetch_p4_local}"; then
			die "failed to ${build_fetch_p4_action} file '${build_fetch_p4_local}'"
		fi
		chmod "${mode}" "${build_fetch_p4_local}"
	done
	unset build_fetch_p4_type
	unset build_fetch_p4_last
	unset build_fetch_p4_action
	unset build_fetch_p4_rev
	unset build_fetch_p4_remote
	unset build_fetch_p4_local
	unset build_fetch_p4_line

	exit 0

	cd "${build_fetch_p4_tmp}"
	tar caf "${build_fetch_p4_var}" "${build_fetch_p4_dir}"

	if test ! -d "${BUILDER_SRCDIR}"; then
		mkdir -p "${BUILDER_SRCDIR}"
	fi

	mv "${build_fetch_p4_var}" "${BUILDER_SRCDIR}/${build_fetch_p4_var}"

	if [ -d "${build_fetch_p4_tmp}" ]; then
		rm -rf "${build_fetch_p4_tmp}"
	fi

	unset build_fetch_p4_tmp
	unset build_fetch_p4_var
	unset build_fetch_p4_dir
	unset build_fetch_p4_uri
}

if test "${BUILDER_CALL_STACK}" = '__main__'; then
	simple_usage 'fetch-p4' '<url>' "$@"
	build_fetch_p4 "${1}"
fi

# vim: filetype=sh