trigger implementation

asset/player.go

@@ -1,7 +1,6 @@
 package asset
 
 import (
-	"fmt"
 	"github.com/hajimehoshi/go-mp3"
 	"github.com/hajimehoshi/oto"
 	"io"
@@ -31,7 +30,5 @@ func Beep() error {
 		return err
 	}
 
-	fmt.Print("\a")
-
 	return nil
 }

component/runchart/runchart.go

@@ -2,6 +2,7 @@ package runchart
 
 import (
 	"fmt"
+	"github.com/sqshq/sampler/component/trigger"
 	"github.com/sqshq/sampler/console"
 	"github.com/sqshq/sampler/data"
 	"image"
@@ -36,6 +37,7 @@ const (
 
 type RunChart struct {
 	ui.Block
+	triggers  []trigger.Trigger
 	lines     []TimeLine
 	grid      ChartGrid
 	timescale time.Duration

component/trigger/trigger.go

@@ -0,0 +1,99 @@
+package trigger
+
+import (
+	"fmt"
+	"github.com/sqshq/sampler/asset"
+	"github.com/sqshq/sampler/config"
+	"os"
+	"os/exec"
+)
+
+const (
+	TrueIndicator = "1"
+	BellCharacter = "\a"
+)
+
+type Trigger struct {
+	title     string
+	condition string
+	actions   Actions
+	data      map[string]Data
+}
+
+type Actions struct {
+	terminalBell bool
+	sound        bool
+	visual       bool
+	script       *string
+}
+
+type Data struct {
+	previousValue interface{}
+	currentValue  interface{}
+}
+
+func NewTrigger(config config.TriggerConfig) Trigger {
+	return Trigger{
+		title:     config.Title,
+		condition: config.Condition,
+		actions: Actions{
+			terminalBell: *config.Actions.TerminalBell,
+			sound:        *config.Actions.Sound,
+			visual:       *config.Actions.Visual,
+			script:       config.Actions.Script,
+		},
+	}
+}
+
+func (t Trigger) execute(label string, value interface{}) {
+	go func() {
+		if data, ok := t.data[label]; ok {
+			data.previousValue = data.currentValue
+			data.currentValue = value
+		} else {
+			t.data[label] = Data{previousValue: nil, currentValue: value}
+		}
+		t.evaluate(label, t.data[label])
+	}()
+}
+
+func (t Trigger) evaluate(label string, data Data) {
+
+	output, err := runScript(t.condition, label, data)
+
+	if err != nil {
+		println(err) // TODO visual notification
+	}
+
+	if string(output) != TrueIndicator {
+		return
+	}
+
+	if t.actions.terminalBell {
+		fmt.Print(BellCharacter)
+	}
+
+	if t.actions.sound {
+		_ = asset.Beep()
+	}
+
+	if t.actions.visual {
+		// TODO visual notification
+	}
+
+	if t.actions.script != nil {
+		_, _ = runScript(*t.actions.script, label, data)
+	}
+}
+
+func runScript(script, label string, data Data) ([]byte, error) {
+	cmd := exec.Command("sh", "-c", script)
+
+	cmd.Env = os.Environ()
+	cmd.Env = append(cmd.Env,
+		fmt.Sprintf("prev=%v", data.previousValue),
+		fmt.Sprintf("cur=%v", data.currentValue),
+		fmt.Sprintf("label=%v", label))
+
+	return cmd.Output()
+}

config.yml

@@ -6,7 +6,6 @@ runcharts:
   size:
     w: 53
     h: 16
-  scale: 3
   triggers:
     - title: PROCESSING STARTED # ${prev} ${cur} ${lavel} echo $(( 3 < 4 && 1 > 2 ))
       condition: ((${prev} == 0 && ${cur} > 0))

config/component.go

@@ -11,6 +11,7 @@ type ComponentConfig struct {
 	RefreshRateMs *int            `yaml:"refresh-rate-ms,omitempty"`
 	Position      Position        `yaml:"position"`
 	Size          Size            `yaml:"size"`
+	Triggers      []TriggerConfig `yaml:"triggers,omitempty"`
 }
 
 type TriggerConfig struct {
@@ -28,7 +29,6 @@ type ActionsConfig struct {
 
 type GaugeConfig struct {
 	ComponentConfig `yaml:",inline"`
-	Triggers        []TriggerConfig   `yaml:"triggers"`
 	Scale           *int              `yaml:"scale,omitempty"`
 	Color           *ui.Color         `yaml:"color,omitempty"`
 	Values          map[string]string `yaml:"values"`
@@ -37,21 +37,18 @@ type GaugeConfig struct {
 
 type BarChartConfig struct {
 	ComponentConfig `yaml:",inline"`
-	Triggers        []TriggerConfig `yaml:"triggers"`
 	Scale           *int        `yaml:"scale,omitempty"`
 	Items           []data.Item `yaml:"items"`
 }
 
 type AsciiBoxConfig struct {
 	ComponentConfig `yaml:",inline"`
-	Triggers        []TriggerConfig `yaml:"triggers"`
 	data.Item       `yaml:",inline"`
 	Font            *asciibox.AsciiFont `yaml:"font,omitempty"`
 }
 
 type RunChartConfig struct {
 	ComponentConfig `yaml:",inline"`
-	Triggers        []TriggerConfig `yaml:"triggers"`
 	Legend          *LegendConfig `yaml:"legend,omitempty"`
 	Scale           *int          `yaml:"scale,omitempty"`
 	Items           []data.Item   `yaml:"items"`

config/config.go

@@ -24,16 +24,16 @@ type Flags struct {
 
 func Load() (Config, Flags) {
 
-	//if len(os.Args) < 2 {
+	if len(os.Args) < 2 {
-	//	println("Please specify config file location. See www.github.com/sqshq/sampler for the reference")
+		println("Please specify config file location. See www.github.com/sqshq/sampler for the reference")
-	//	os.Exit(0)
+		os.Exit(0)
-	//}
+	}
 
-	cfg := readFile("config.yml")
+	cfg := readFile(os.Args[1])
 	cfg.validate()
 	cfg.setDefaults()
 
-	flg := Flags{ConfigFileName: "config.yml"}
+	flg := Flags{ConfigFileName: os.Args[1]}
 
 	return *cfg, flg
 }