# Copyright (C)        2009 - 2010 Dirk Eddelbuettel and Romain Francois
#
# This file is part of Rcpp.
#
# Rcpp is free software: you can redistribute it and/or modify it
# under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 2 of the License, or
# (at your option) any later version.
#
# Rcpp is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with Rcpp.  If not, see <http://www.gnu.org/licenses/>.

Rcpp.package.skeleton <- function(
	name = "anRpackage", list = character(), environment = .GlobalEnv,
	path = ".", force = FALSE, namespace = TRUE, 
	code_files = character() ){
	
	# first let the traditional version do its business
	call <- match.call()
	call[[1]] <- as.name("package.skeleton")
	call[["namespace"]] <- namespace
	print( call )	
	env <- parent.frame(1)
	
	tryCatch( eval( call, envir = env ), error = function(e){
		stop( "error while calling `package.skeleton`" )
	} )
	
	message( "\nAdding Rcpp settings" )
	
	# now pick things up 
	root <- file.path( path, name )
	
	# Add Rcpp to the DESCRIPTION
	DESCRIPTION <- file.path( root, "DESCRIPTION" )
	if( file.exists( DESCRIPTION ) ){
		x <- cbind( read.dcf( DESCRIPTION ), 
			"Depends" = sprintf( "Rcpp (>= %s)", packageDescription("Rcpp")[["Version"]]  ) )
		write.dcf( x, file = DESCRIPTION )
		message( " >> added Rcpp to Depends" )
	}
	
	# if there is a NAMESPACE, add a useDynLib
	NAMESPACE <- file.path( root, "NAMESPACE")
	if( file.exists( NAMESPACE ) ){
		lines <- readLines( NAMESPACE )
		if( ! grepl( "useDynLib", lines ) ){
			lines <- c( sprintf( "useDynLib(%s)", name), lines)
			writeLines( lines, con = NAMESPACE )
			message( " >> added useDynLib directive to NAMESPACE" )
		}
	}
	
	# lay things out in the src directory
	src <- file.path( root, "src")
	if( !file.exists( src )){
		dir.create( src )
	}
	skeleton <- system.file( "skeleton", package = "Rcpp" )
	Makevars <- file.path( src, "Makevars" )
	if( !file.exists( Makevars ) ){
		file.copy( file.path( skeleton, "Makevars" ), Makevars )
		message( " >> added Makevars file with Rcpp settings" )
	}
	
	Makevars.win <- file.path( src, "Makevars.win" )
	if( !file.exists( Makevars.win ) ){
		file.copy( file.path( skeleton, "Makevars.win" ), Makevars.win )
		message( " >> added Makevars.win file with Rcpp settings" )
	}
	
	header <- readLines( file.path( skeleton, "rcpp_hello_world.h" ) )
	header <- gsub( "@PKG@", name, header, fixed = TRUE )
	writeLines( header , file.path( src, "rcpp_hello_world.h" ) )
	message( " >> added example header file using Rcpp classes")
	
	file.copy( file.path( skeleton, "rcpp_hello_world.cpp" ), src )
	message( " >> added example src file using Rcpp classes")
	
	rcode <- readLines( file.path( skeleton, "rcpp_hello_world.R" ) )
	rcode <- gsub( "@PKG@", name, rcode, fixed = TRUE )
	writeLines( rcode , file.path( root, "R", "rcpp_hello_world.R" ) )
	message( " >> added example R file calling the C++ example")
	
	invisible( NULL )
}