visual alerter basic functionality

component/alerter.go

@@ -1,10 +1,12 @@
 package component
 
 import (
+	"fmt"
 	"github.com/sqshq/sampler/console"
 	"github.com/sqshq/sampler/data"
 	ui "github.com/sqshq/termui"
 	"image"
+	"strings"
 )
 
 type Alerter struct {
@@ -35,7 +37,57 @@ func (a *Alerter) RenderAlert(buffer *ui.Buffer, area image.Rectangle) {
 		return
 	}
 
-	buffer.Fill(ui.NewCell(' ', ui.NewStyle(console.ColorBlack)), area)
-	buffer.SetString(a.alert.Title, ui.NewStyle(console.ColorWhite), getMiddlePoint(area, a.alert.Title, -1))
-	buffer.SetString(a.alert.Text, ui.NewStyle(console.ColorWhite), getMiddlePoint(area, a.alert.Text, 0))
+	color := console.ColorWhite
+
+	if a.alert.Color != nil {
+		color = *a.alert.Color
+	}
+
+	width := max(len(a.alert.Title), len(a.alert.Text)) + 10
+
+	if width > area.Dx() {
+		width = area.Dx()
+	}
+
+	cells := ui.WrapCells(ui.ParseText(fmt.Sprintf("%s\n%s\n",
+		strings.ToUpper(a.alert.Title), a.alert.Text), ui.NewStyle(console.ColorWhite)), uint(width))
+
+	var lines []string
+	line := ""
+
+	for i := 0; i < len(cells); i++ {
+		if cells[i].Rune == '\n' {
+			lines = append(lines, line)
+			line = ""
+		} else {
+			line += string(cells[i].Rune)
+		}
+	}
+
+	block := *ui.NewBlock()
+	block.SetRect(getRectCoordinates(area, width, len(lines)))
+	block.BorderStyle = ui.Style{Fg: color}
+	block.Draw(buffer)
+
+	buffer.Fill(ui.NewCell(' ', ui.NewStyle(console.ColorBlack)), block.Inner)
+
+	for i := 0; i < len(lines); i++ {
+		buffer.SetString(lines[i],
+			ui.NewStyle(color), getMiddlePoint(block.Inner, lines[i], i-1))
+	}
+}
+
+//TODO move to utils
+func max(a int, b int) int {
+	if a > b {
+		return a
+	} else {
+		return b
+	}
+}
+
+func getRectCoordinates(area image.Rectangle, width int, height int) (int, int, int, int) {
+	x1 := area.Min.X + area.Dx()/2 - width/2
+	y1 := area.Min.Y + area.Dy()/2 - height
+	return x1, y1, x1 + width, y1 + height + 2
 }

component/menu.go

@@ -198,7 +198,7 @@ func (m *Menu) printAllDirectionsArrowSign(buffer *ui.Buffer, y int) {
 func (m *Menu) renderOptions(buffer *ui.Buffer) {
 
 	// TODO extract styles to console.Palette
-	highlightedStyle := ui.NewStyle(console.ColorOlive, console.ColorBlack, ui.ModifierReverse)
+	highlightedStyle := ui.NewStyle(console.ColorBlack, console.ColorOlive)
 	regularStyle := ui.NewStyle(console.ColorWhite, console.ColorBlack)
 
 	offset := 1

config.yml

@@ -7,7 +7,7 @@ runcharts:
     w: 53
     h: 16
   triggers:
-  - title: LATENCY
+  - title: Latency threshold exceeded
     condition: echo "$prev < 0.2 && $cur > 0.2" |bc -l
     actions:
       terminal-bell: true

data/consumer.go

@@ -1,5 +1,7 @@
 package data
 
+import ui "github.com/sqshq/termui"
+
 type Consumer struct {
 	SampleChannel chan Sample
 	AlertChannel  chan Alert
@@ -8,11 +10,13 @@ type Consumer struct {
 type Sample struct {
 	Label string
 	Value string
+	Color *ui.Color
 }
 
 type Alert struct {
 	Title string
 	Text  string
+	Color *ui.Color
 }
 
 func NewConsumer() Consumer {

data/sampler.go

@@ -51,13 +51,14 @@ func (s *Sampler) sample(item Item) {
 	val, err := item.nextValue()
 
 	if err == nil {
-		sample := Sample{Label: item.Label, Value: val}
+		sample := Sample{Label: item.Label, Value: val, Color: item.Color}
 		s.consumer.SampleChannel <- sample
 		s.triggersChannel <- sample
 	} else {
 		s.consumer.AlertChannel <- Alert{
 			Title: "SAMPLING FAILURE",
 			Text:  err.Error(),
+			Color: item.Color,
 		}
 	}
 }

data/trigger.go

@@ -78,7 +78,9 @@ func (t *Trigger) Execute(sample Sample) {
 
 		if t.actions.visual {
 			t.consumer.AlertChannel <- Alert{
-				Title: t.title, Text: fmt.Sprintf("%s: %v", sample.Label, sample.Value),
+				Title: t.title,
+				Text:  fmt.Sprintf("%s: %v", sample.Label, sample.Value),
+				Color: sample.Color,
 			}
 		}
 
@@ -101,7 +103,7 @@ func (t *Trigger) evaluate(sample Sample) bool {
 	output, err := runScript(t.condition, sample.Label, t.valuesByLabel[sample.Label])
 
 	if err != nil {
-		//t.consumer.AlertChannel <- Alert{Title: "TRIGGER CONDITION FAILURE", Text: err.Error()}
+		t.consumer.AlertChannel <- Alert{Title: "TRIGGER CONDITION FAILURE", Text: err.Error()}
 	}
 
 	return t.digitsRegexp.ReplaceAllString(string(output), "") == TrueIndicator