#!/bin/bash
#
#   Adapted from Eridan's "fs" (cleanup, enhancements and switch to bash/Linux)
#   JM,  10/12/2004
#
# -------------------------------------------------------------------------
#   Decoding options
# -------------------------------------------------------------------------
USAGE="--> Usage: $0 [-h(elp)] | [-n(arrow mode)] | [-w(eb output)]"

NARROW_MODE=0
WEB_OUTPUT=0

while [ $# -gt 0 ]; do
case "$1" in
"-h" )
echo $USAGE
exit
;;
"-d" )
DEBUG=1
;;
"-n" )
NARROW_MODE=1
;;
"-w" )
WEB_OUTPUT=1
;;
* )
echo $USAGE
exit
;;
esac
shift
done

# -------------------------------------------------------------------------
#   Preparations
# -------------------------------------------------------------------------
SYSTEM=`uname -s`
PATTERN="/"

case "$SYSTEM" in
"Linux" )
DF_COMMAND="/bin/df -k"
SORT_COMMAND="/usr/bin/sort -k6"
AWK_COMMAND="/bin/awk"
;;
* )
DF_COMMAND="/bin/df -k"
SORT_COMMAND="/usr/bin/sort -k6"
AWK_COMMAND="/opt/local/bin/gawk"
;;
esac

if [ ! -x ${AWK_COMMAND} ]; then
echo "### ${AWK_COMMAND} not present; install it! ###"
echo "    On Mac OS X: install MacPorts and perform:"
echo "    sudo port install gawk"
fi

# -------------------------------------------------------------------------
#   Grabbing "df" result
# -------------------------------------------------------------------------
DF_RESULT=`$DF_COMMAND`
if [ ! -z $DEBUG ]; then
echo "--> DF_RESULT:"
echo "$DF_RESULT"
echo ""
fi

# -------------------------------------------------------------------------
#   Preprocessing "df" result, to join split logical lines
# -------------------------------------------------------------------------
PREPROCESSING_RESULT=` \
										 echo "$DF_RESULT" | $AWK_COMMAND -v PATTERN=$PATTERN \
										 '
										 NF == 1 {
											 printf ("%s", $0)
										 }

NF == 5 {
	printf ("%s\n", $0)
}

NF > 6  {
}

NF == 6 {
	printf ("%s\n", $0)
}'
`
if [ ! -z $DEBUG ]; then
echo "--> PREPROCESSING_RESULT:"
echo "$PREPROCESSING_RESULT"
echo ""
fi

SORTED_FILE_SYSTEMS_INFO=`echo "$PREPROCESSING_RESULT" | $SORT_COMMAND`

if [ ! -z $DEBUG ]; then
echo "--> SORTED_FILE_SYSTEMS_INFO:"
echo "$SORTED_FILE_SYSTEMS_INFO"
echo ""
fi

# -------------------------------------------------------------------------
#   Computing mount point max length
# -------------------------------------------------------------------------
MOUNT_POINT_MAX_LENGTH=` \
											 echo $SORTED_FILE_SYSTEMS_INFO | $AWK_COMMAND -v PATTERN=$PATTERN \
											 '
											 BEGIN       {
												 mount_point_length_max = 15;
											 }

END     {
	printf ("%d", mount_point_length_max);
}

$0 ~ PATTERN    {
#       printf ("$6 = %s\n", $6);

	mount_point = $6;
#       printf ("mount_point = %s\n", mount_point);

	mount_point_length = length (mount_point);
#       printf ("mount_point_length = %d\n", mount_point_length);

	if (mount_point_length > mount_point_length_max)
		mount_point_length_max = mount_point_length;
}'
`
if [ ! -z $DEBUG ]; then
echo "MOUNT_POINT_MAX_LENGTH:      $MOUNT_POINT_MAX_LENGTH"
fi

# -------------------------------------------------------------------------
#   Computing mount point data max size
# -------------------------------------------------------------------------
MOUNT_POINT_MAX_SIZE=` \
										 echo "$SORTED_FILE_SYSTEMS_INFO" | $AWK_COMMAND -v PATTERN=$PATTERN \
										 '
										 BEGIN       {
											 mount_point_size_max = 0;
										 }

END     {
	printf ("%d", mount_point_size_max);
}

$0 ~ PATTERN    {
#       df -k shows k_bytes!
#       printf ("$2 = %s\n", $2);

	mount_point_size = $2 * 1024;
#       printf ("mount_point_size = %d\n", mount_point_size);

	if (mount_point_size > mount_point_size_max)
		mount_point_size_max = mount_point_size;
}'
`
if [ ! -z $DEBUG ]; then
echo "MOUNT_POINT_MAX_SIZE:      $MOUNT_POINT_MAX_SIZE"
fi

# -------------------------------------------------------------------------
#   Let's go!
# -------------------------------------------------------------------------
echo "$SORTED_FILE_SYSTEMS_INFO" | $AWK_COMMAND -v DEBUG=$DEBUG -v PATTERN=$PATTERN -v NARROW_MODE=$NARROW_MODE -v LEFT_COLUMN=$MOUNT_POINT_MAX_LENGTH -v MAX_SIZE=$MOUNT_POINT_MAX_SIZE -v SCALE=$SCALE -v WEB_OUTPUT=$WEB_OUTPUT \
			 '
#   {printf ("$0 = %s\n", $0);}
#   {printf ("$1 = %s\n", $1);}
#   {printf ("PATTERN = %s\n", PATTERN);}
#   {printf ("LEFT_COLUMN = %s\n", LEFT_COLUMN);}

			 BEGIN       {
				 k_bytes = 1024.0;
				 m_bytes = 1024.0 * k_bytes;
				 g_bytes = 1024.0 * m_bytes;
				 t_bytes = 1024.0 * g_bytes;

				 if (WEB_OUTPUT)
				 {
					 all_stars = "**************************************************";
					 current_date = strftime ("%d-%m-%Y @ %H:%M:%S", localtime (systime ()));
					 free_threshold = 10; # %

						 printf ("<!-- DEBUT CONTENU -->\n");

					 printf ( \
							 "<A NAME=\"top\"></A>\n" \
							 "<P ALIGN=CENTER><SPAN CLASS=\"titleblue\">%s</SPAN><SPAN CLASS=\"textbold\">  --  STATUS OF <SPAN CLASS=\"titlered\">ALCOR</SPAN> FILE SYSTEMS</SPAN></P><BR>\n",
							 current_date )

						 printf ("<TABLE WIDTH=\"100%%\" BORDER=1>\n");

					 printf ( \
							 "<TR>\n" \
							 "<TD ALIGN=LEFT><STRONG>Mount point</STRONG></TD>\n" \
							 "<TD ALIGN=CENTER><STRONG>%% Usato&nbsp;(<SPAN CLASS=\"titleblue\">*</SPAN>)" \
							 "&nbsp;-&nbsp;%% Free&nbsp;(<SPAN CLASS=\"titlegreen\">*</SPAN>)</STRONG></TD>\n" \
							 "<TD ALIGN=CENTER><STRONG>%% Usato</STRONG></TD>\n" \
							 "<TD ALIGN=CENTER><STRONG>Spazio libero</STRONG></TD>\n" \
							 "<TD ALIGN=CENTER><STRONG>Spazio totale</STRONG></TD>\n" \
							 "</TR>\n" );
				 }
				 else
				 {
					 narrow_margin = "       ";
#           printf ("%-*s", LEFT_COLUMN + 2, "Mount point");
						 if (NARROW_MODE)
							 printf ("\n%s", narrow_margin);
						 else
							 printf ("%-*s", LEFT_COLUMN + 2, "");
					 print "                                                     Used    Free     Total ";
					 if (! NARROW_MODE)
						 print "";
				 }
			 }

END     {
	if (WEB_OUTPUT)
	{
		printf ("</TABLE>\n");

		printf ("<!-- FIN CONTENU -->\n");
	}
	else
	{
		if (NARROW_MODE)
			printf ("%s", narrow_margin);
		else
			printf ("%-*s", LEFT_COLUMN + 2, "");
		print "|----|----|----|----|----|----|----|----|----|----|"
			if (NARROW_MODE)
				printf ("\n%s", narrow_margin);
			else
				printf ("%-*s", LEFT_COLUMN + 2, "");
		print "0   10   20   30   40   50   60   70   80   90  100";
		print "";
	}
}

$0 ~ PATTERN    {

	if (index ($0, "members") == 0 && index ($0, "Download") == 0 && index ($0, "admin") == 0)
	{
#       df -k shows k_bytes!

		total_size = $2 * k_bytes;
		free_size = $4 * k_bytes;
		percentage_occupied = substr($5, 0, 3);
		mount_point = $6;

		percentage_free = int (100 - percentage_occupied);

#       reduction_factor: 2
		stars_number = int (percentage_occupied / 2);

		if (WEB_OUTPUT)
		{
			posGroup = index (mount_point, "scratch");
			if (posGroup == 0)
				posGroup = index (mount_point, "u1");
			if (posGroup == 0)
				posGroup = index (mount_point, "u2");
			if (posGroup == 0)
				posGroup = index (mount_point, "u4");
			if (posGroup == 0)
				posGroup = index (mount_point, "u5");

			printf ("<TR>\n");

			if (posGroup > 0 || percentage_free < free_threshold)
			{
				if (percentage_free < free_threshold)
				{
					class = "titlered";
					if (posGroup == 0)
						posGroup = 1;   # to display the whole mount_point in this color anyway
				}
				else if ((index (mount_point, "scratch") != 0) || (index (mount_point, "u1") != 0) || (index (mount_point, "u2") != 0))
				{
					class = "titleorange";
					posGroup = 1;   # to display the whole mount_point in this color
				}
				else if ((index (mount_point, "u4") != 0) || (index (mount_point, "u5") != 0))
				{
					class = "titlebrown";
					posGroup = 1;   # to display the whole mount_point in this color
				}

				printf ( \
						"<TD ALIGN=LEFT>%s<SPAN CLASS=\"%s\">%s</SPAN></TD>\n",
						substr (mount_point, 1, posGroup - 1),
						class,
						substr (mount_point, posGroup) );
			}
			else
			{
				printf ("<TD ALIGN=LEFT>%s</TD>\n", mount_point);
			}

			printf ( \
					"<TD ALIGN=CENTER><SPAN CLASS=\"titleblue\">%s</SPAN><SPAN CLASS=\"titlegreen\">%s</SPAN></TD>\n",
					substr (all_stars, 1, stars_number), substr (all_stars, stars_number + 1, 49) );

			if (percentage_free < free_threshold)
			{
				color_beginning = "<SPAN CLASS=\"titlered\">";
				color_end = "</SPAN>"
			}
			else
			{
				color_beginning = "";
				color_end = ""
			}

			if (total_size > 1 * t_bytes)
				printf ( \
						"<TD ALIGN=RIGHT>%s%3d%%%s</TD><TD ALIGN=RIGHT>%5.1f Tb</TD><TD ALIGN=RIGHT>%5.1f Tb</TD>\n", \
						color_beginning, percentage_occupied, color_end, free_size / t_bytes, total_size / t_bytes \
						);
			else if (total_size > 1 * g_bytes)
				printf ( \
						"<TD ALIGN=RIGHT>%s%3d%%%s</TD><TD ALIGN=RIGHT>%5.1f Gb</TD><TD ALIGN=RIGHT>%5.1f Gb</TD>\n", \
						color_beginning, percentage_occupied, color_end, free_size / g_bytes, total_size / g_bytes \
						);
			else if (total_size > 1 * m_byptes)
				printf ( \
						"<TD ALIGN=RIGHT>%s%3d%%%s</TD><TD ALIGN=RIGHT>%5.1f Mb</TD><TD ALIGN=RIGHT>%5.1f Mb</TD>\n", \
						color_beginning, percentage_occupied, color_end, free_size / m_bytes, total_size / m_bytes \
						);
			else
				printf ( \
						"<TD ALIGN=RIGHT>%s%3d%%%s</TD><TD ALIGN=RIGHT>%5.1f Kb</TD><TD ALIGN=RIGHT>%5.1f Kb</TD>\n", \
						color_beginning, percentage_occupied, color_end, free_size / k_bytes, total_size / k_bytes \
						);

			printf ("</TR>\n");
		}

		else
		{
#           printf ("percentage_occupied = %d\n", percentage_occupied);
#           printf ("percentage_free = %d\n", percentage_free);

			printf ("%-*s", LEFT_COLUMN + 2, mount_point);
			if (NARROW_MODE)
				printf ("\n%s", narrow_margin);

#           printf ("stars_number = %d\n", stars_number);

			printf ("|");
			for (i = 1; i <= stars_number; i++)
			{
				printf ("%s", "*");
			}
			for (i = stars_number + 1; i <= 49; i++)
			{
				printf ("%s", "-");
			}


			if (total_size > 1 * t_bytes)
				printf ( \
						"| %3d%%    %5.1f    %5.1f Tb\n", \
						percentage_occupied, free_size / t_bytes, total_size / t_bytes \
						);
			else if (total_size > 1 * g_bytes)
				printf ( \
						"| %3d%%    %5.1f    %5.1f Gb\n", \
						percentage_occupied, free_size / g_bytes, total_size / g_bytes \
						);
			else if (total_size > 1 * m_byptes)
				printf ( \
						"| %3d%%    %5.1f    %5.1f Mb\n", \
						percentage_occupied, free_size / m_bytes, total_size / m_bytes \
						);
			else
				printf ( \
						"| %3d%%    %5.1f    %5.1f Kb\n", \
						percentage_occupied, free_size / k_bytes, total_size / k_bytes \
						);
		}
	}   # if
}'