#!/bin/sh

# $Id: prerequisites_imapsync,v 1.12 2015/07/06 03:12:43 gilles Exp gilles $

MODULES_MANDATORY='
Digest::HMAC_MD5
Authen::NTLM
Compress::Zlib
Data::Dumper
Data::Uniqid
Digest::HMAC
Digest::MD5
File::Copy::Recursive
IO::Socket::INET
IO::Socket::INET6
IO::Socket::SSL
IO::Tee
Mail::IMAPClient
Parse::RecDescent
Term::ReadKey
Test::More
Test::Pod
Unicode::String
URI::Escape
'

MODULES_DEVEL='
Module::ScanDeps
PAR::Packer
'

test_perl() {
# First we need perl

	if perl -v > /dev/null 2>&1 ; then
		perl_version=`perl -e 'printf "%vd\n", $^V;'`
		echo Ok: Found Perl $perl_version
		return 0
	else
		echo Failure: Perl is not here. You have to install Perl first.
		return 1
	fi
}


test_module() {
	test -n $1 || return
	M_tested=$1
	shift
	if perl -m"$M_tested" -e '' >/dev/null 2>&1 ; then
		echo "Ok: Found Perl module $M_tested"
	else
		echo "Failure: Not found Perl module $M_tested $@"
		LIST_TO_INSTALL="$LIST_TO_INSTALL $M_tested"
	fi
}

test_mandatory_modules() {
	for M in $MODULES_MANDATORY
	do
		test_module $M
	done
}


search_modules_any() {
	test -n "$*" || {
		echo "All needed modules are already installed"
		return
	}
	apt-file -h > /dev/null 2>&1 && {
		search_modules_apt "$@"
		return
	}
	yum -h > /dev/null 2>&1 && {
		search_modules_yum  "$@"
		return
	}
	
	# no yum, no apt-get
	{
		search_modules_cpan "$@"
		return
	}
}

search_modules_cpan() {
		cat <<EOD
Here is a cpan command to install missing Perl modules:
cpan -i $@
EOD
}


search_modules_yum() {
	echo 
	echo Searching rpm packages names
	for M in "$@" ; do
		echo "==== Searching rpm package name for $M"
		F=`echo $M|tr -s ":" "/"`.pm
		#echo yum -q whatprovides "*/$F"
		echo
		yum -q whatprovides "*/$F"
		echo
	done
}

search_modules_apt() {
	echo 
	echo Searching deb packages names
	for M in "$@" ; do
		echo "==== Searching deb package name for $M"
		F=`echo $M|tr -s ":" "/"`.pm
		#echo apt-file search /$F
		echo
		apt-file search /$F
		#apt-cache search "$M"
		echo
	done
}


list_to_install() {
	test -n "$LIST_TO_INSTALL" || return
	echo
	echo 'What you have to do before using imapsync:'
	for M in $LIST_TO_INSTALL ; do
		echo "Install Perl module $M"
	done
}

test_unix() {
	echo '$SHELL says ' $SHELL
	echo '$0 gives ' $0 
	echo -n "ps -ef gives " ; ps -ef | grep $$ | grep -v grep| grep -v 'ps -ef'
	sw_vers > /dev/null 2>&1 && sw_vers # Darwin
	lsb_release -dirc > /dev/null 2>&1 && lsb_release -dirc # Linux
	uname -a
}

test_unix
#exit
test_perl || exit
test_mandatory_modules
list_to_install
#search_modules_cpan $MODULES_MANDATORY
search_modules_any $LIST_TO_INSTALL