#!/usr/bin/r -t

# Note: everything in the case needs to be system-independent!
library(cran2deb)
library(ctv)

#argv <- commandArgs()
#argv <- argv[-(1:match("--args", argv))]

#mirror <- 'http://cran.uk.r-project.org/'
mirror <- 'http://cran.r-project.org/'

verbose<-FALSE

message('updating list of available R packages...')
available <- available.packages(contrib.url(mirror))

#available <- rbind(available,available.packages(contrib.url('http://www.bioconductor.org/')))
#dupes <- duplicated(rownames(available), fromLast=T)
#available <- available[!dupes,]

message('updating list of available R task views...')
ctv.available <- available.views(repo=mirror)

message('updating list of base R packages...')
base_pkgs <- readLines(pipe(paste('sudo pbuilder --execute --override-config --configfile'
                                 ,shQuote(pbuilder_config),'-- /usr/bin/R --vanilla 2>&1 >/dev/null <'
                                 ,shQuote(file.path(root,'exec/get_base_pkgs'))
                                 ,'| grep -v ^W:')))

if (any(grep("^E:",base_pkgs,value=FALSE))) {
	cat("Cannot continue, the following error occurred:\n")
	cat(paste(grep("^E:",base_pkgs,value=TRUE),collapse="\n"))
	cat("\n")
	q(save="no")
}


if (verbose) {
	cat("The following base packages were determined:\n")
	print(base_pkgs)
}

message('updating list of existing Debian packages...')
debian_pkgs <- readLines(pipe('apt-cache rdepends r-base-core | sed -e "/^  r-cran/{s/^[[:space:]]*r/r/;p}" -e d | sort -u'))

if (any(grep("^E:",debian_pkgs,value=FALSE))) {
	cat("Cannot continue, the following error occurred:\n")
	cat(paste(grep("^E:",debian_pkgs,value=TRUE),collapse="\n"))
	cat("\n")
	q(save="no")
}

if (verbose) {
	cat("The following packages were found to be available:\n")
	print(debian_pkgs)
}

save(debian_pkgs, base_pkgs, available, ctv.available, file=file.path(cache_root,'cache.rda'),eval.promises=T)

message('synchronising database...')
db_update_package_versions()