luci_statistics: Add y_min, y_max, units_exponent options and clean up some graphs

Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>

applications/luci-statistics/luasrc/statistics/rrdtool.lua

@@ -457,6 +457,18 @@ function Graph._generic( self, opts, plugin, plugin_instance, dtype, index )
 		_ti( _args, self.i18n:title( plugin, plugin_instance, _sources[1].type, instance, opts.title ) )
 		_ti( _args, "-v" )
 		_ti( _args, self.i18n:label( plugin, plugin_instance, _sources[1].type, instance, opts.vlabel ) )
+		if opts.y_max then
+			_ti ( _args, "-u" )
+			_ti ( _args, opts.y_max )
+		end
+		if opts.y_min then
+			_ti ( _args, "-l" )
+			_ti ( _args, opts.y_min )
+		end
+		if opts.units_exponent then
+			_ti ( _args, "-X" )
+			_ti ( _args, opts.units_exponent )
+		end
 
 		-- store additional rrd options
 		if opts.rrdopts then

applications/luci-statistics/luasrc/statistics/rrdtool/definitions/cpu.lua

@@ -19,6 +19,7 @@ function rrdargs( graph, plugin, plugin_instance, dtype )
 
 	return {
 		title = "%H: Processor usage on core #%pi",
+		y_min = "0",
 		vlabel = "Percent",
 		number_format = "%5.1lf%%",
 		data = {

applications/luci-statistics/luasrc/statistics/rrdtool/definitions/load.lua

@@ -19,6 +19,8 @@ function rrdargs( graph, plugin, plugin_instance, dtype )
 
 	return {
 		title = "%H: Load", vlabel = "Load",
+		y_min = "0",
+		units_exponent = "0",
 		number_format = "%5.2lf", data = {
 			sources = {
 				load = { "shortterm", "midterm", "longterm" }

applications/luci-statistics/luasrc/statistics/rrdtool/definitions/nut.lua

@@ -53,6 +53,8 @@ function rrdargs( graph, plugin, plugin_instance, dtype )
 	local percentage = {
 		title = "%H: Battery charge on UPS \"%pi\"",
 		vlabel = "Percent",
+		y_min = "0",
+		y_max = "100",
 		number_format = "%5.1lf%%",
 		data = {
 		        sources = {