sparkline config and infrastructure added

component/runchart/runchart.go

@@ -16,10 +16,10 @@ import (
 )
 
 const (
+	xAxisGridWidth     = xAxisLabelsIndent + xAxisLabelsWidth
 	xAxisLabelsHeight  = 1
 	xAxisLabelsWidth   = 8
 	xAxisLabelsIndent  = 2
-	xAxisGridWidth     = xAxisLabelsIndent + xAxisLabelsWidth
 	yAxisLabelsHeight  = 1
 	yAxisLabelsIndent  = 1
 	historyReserveMin  = 20

component/sparkline/sparkline.go

@@ -0,0 +1,61 @@
+package sparkline
+
+import (
+	ui "github.com/gizak/termui/v3"
+	"github.com/sqshq/sampler/component"
+	"github.com/sqshq/sampler/config"
+	"github.com/sqshq/sampler/console"
+	"github.com/sqshq/sampler/data"
+	"strconv"
+)
+
+type SparkLine struct {
+	*ui.Block
+	*data.Consumer
+	alert   *data.Alert
+	values  []float64
+	palette console.Palette
+}
+
+func NewSparkLine(c config.SparkLineConfig, palette console.Palette) *SparkLine {
+
+	line := &SparkLine{
+		Block:    component.NewBlock(c.Title, true, palette),
+		Consumer: data.NewConsumer(),
+		values:   []float64{},
+		palette:  palette,
+	}
+
+	go func() {
+		for {
+			select {
+			case sample := <-line.SampleChannel:
+				line.consumeSample(sample)
+			case alert := <-line.AlertChannel:
+				line.alert = alert
+			}
+		}
+	}()
+
+	return line
+}
+
+func (s *SparkLine) consumeSample(sample *data.Sample) {
+	float, err := strconv.ParseFloat(sample.Value, 64)
+
+	if err != nil {
+		s.AlertChannel <- &data.Alert{
+			Title: "FAILED TO PARSE NUMBER",
+			Text:  err.Error(),
+			Color: sample.Color,
+		}
+		return
+	}
+
+	s.values = append(s.values, float)
+	// TODO cleanup old ones
+}
+
+func (s *SparkLine) Draw(buffer *ui.Buffer) {
+	s.Block.Draw(buffer)
+}

config.yml

@@ -80,6 +80,11 @@ asciiboxes:
   position: [[53, 17], [27, 5]]
   value: date +%r
 - title: UTC TIME
-  position: [[53, 22], [27, 6]]
+  position: [[53, 22], [27, 7]]
   value: env TZ=UTC date +%r
   font: 3d
+sparklines:
+- title: CPU usage
+  position: [[28, 17], [25, 12]]
+  scale: 0
+  value: ps -A -o %cpu | awk '{s+=$1} END {print s}'

config/component.go

@@ -53,6 +53,12 @@ type GaugeConfig struct {
 	Items           []Item            `yaml:",omitempty"`
 }
 
+type SparkLineConfig struct {
+	ComponentConfig `yaml:",inline"`
+	Scale           *int `yaml:"scale,omitempty"`
+	Item            Item `yaml:",inline"`
+}
+
 type BarChartConfig struct {
 	ComponentConfig `yaml:",inline"`
 	Scale           *int   `yaml:"scale,omitempty"`

config/config.go

@@ -16,6 +16,7 @@ type Config struct {
 	BarCharts  []BarChartConfig  `yaml:"barcharts,omitempty"`
 	Gauges     []GaugeConfig     `yaml:"gauges,omitempty"`
 	AsciiBoxes []AsciiBoxConfig  `yaml:"asciiboxes,omitempty"`
+	SparkLines []SparkLineConfig `yaml:"sparklines,omitempty"`
 }
 
 func Load() (Config, Options) {
@@ -70,6 +71,12 @@ func (c *Config) findComponent(componentType ComponentType, componentTitle strin
 				return &c.AsciiBoxes[i].ComponentConfig
 			}
 		}
+	case TypeSparkLine:
+		for i, component := range c.SparkLines {
+			if component.Title == componentTitle {
+				return &c.SparkLines[i].ComponentConfig
+			}
+		}
 	}
 
 	panic(fmt.Sprintf(

config/default.go

@@ -43,6 +43,23 @@ func (c *Config) setDefaultValues() {
 		c.RunCharts[i] = chart
 	}
 
+	for i, line := range c.SparkLines {
+
+		setDefaultTriggersValues(line.Triggers)
+		line.ComponentConfig.Type = TypeSparkLine
+		line.Item.Label = &line.Title
+
+		if line.RefreshRateMs == nil {
+			r := defaultRefreshRateMs
+			line.RefreshRateMs = &r
+		}
+		if line.Scale == nil {
+			p := defaultScale
+			line.Scale = &p
+		}
+		c.SparkLines[i] = line
+	}
+
 	for i, chart := range c.BarCharts {
 
 		setDefaultTriggersValues(chart.Triggers)

console/symbol.go

@@ -3,5 +3,5 @@ package console
 const (
 	SymbolSelection   rune = '▲'
 	SymbolVerticalBar rune = '▎'
-	SymbolShade       rune = '⠿'
+	SymbolShade       rune = '═'
 )

main.go

@@ -9,6 +9,7 @@ import (
 	"github.com/sqshq/sampler/component/gauge"
 	"github.com/sqshq/sampler/component/layout"
 	"github.com/sqshq/sampler/component/runchart"
+	"github.com/sqshq/sampler/component/sparkline"
 	"github.com/sqshq/sampler/config"
 	"github.com/sqshq/sampler/console"
 	"github.com/sqshq/sampler/data"
@@ -50,6 +51,12 @@ func main() {
 		starter.start(cpt, cpt.Consumer, c.ComponentConfig, c.Items, c.Triggers)
 	}
 
+	for _, c := range cfg.SparkLines {
+		println(c.Title)
+		cpt := sparkline.NewSparkLine(c, palette)
+		starter.start(cpt, cpt.Consumer, c.ComponentConfig, []config.Item{c.Item}, c.Triggers)
+	}
+
 	for _, c := range cfg.AsciiBoxes {
 		cpt := asciibox.NewAsciiBox(c, palette)
 		starter.start(cpt, cpt.Consumer, c.ComponentConfig, []config.Item{c.Item}, c.Triggers)