config support for init and transform scripts

config.yml

@@ -12,11 +12,11 @@ runcharts:
   scale: 3
   items:
   - label: GOOGLE
-    value: curl -o /dev/null -s -w '%{time_total}'  https://www.google.com
+    sample: curl -o /dev/null -s -w '%{time_total}'  https://www.google.com
   - label: YAHOO
-    value: curl -o /dev/null -s -w '%{time_total}'  https://search.yahoo.com
+    sample: curl -o /dev/null -s -w '%{time_total}'  https://search.yahoo.com
   - label: BING
-    value: curl -o /dev/null -s -w '%{time_total}'  https://www.bing.com
+    sample: curl -o /dev/null -s -w '%{time_total}'  https://www.bing.com
 - title: MONGO COLLECTIONS COUNT
   position: [[53, 0], [27, 8]]
   legend:
@@ -25,9 +25,11 @@ runcharts:
   scale: 0
   items:
   - label: ACTIVE
-    value: mongo --quiet --host=localhost blog --eval "db.getCollection('posts').find({status:'ACTIVE'}).itcount()"
+    init: mongo --quiet --host=localhost blog
+    sample: mongo --quiet --host=localhost blog --eval "db.getCollection('posts').find({status:'INACTIVE'}).itcount()"
+    transform: $sample | grep cpu
   - label: INACTIVE
-    value: mongo --quiet --host=localhost blog --eval "db.getCollection('posts').find({status:'INACTIVE'}).itcount()"
+    sample: mongo --quiet --host=localhost blog --eval "db.getCollection('posts').find({status:'INACTIVE'}).itcount()"
 barcharts:
 - title: EVENTS BY STATUS
   refresh-rate-ms: 1000
@@ -35,34 +37,40 @@ barcharts:
   scale: 0
   items:
   - label: NEW
-    value: mongo --quiet --host=localhost blog --eval "db.getCollection('posts').find({status:'ACTIVE'}).itcount()"
+    sample: mongo --quiet --host=localhost blog --eval "db.getCollection('posts').find({status:'ACTIVE'}).itcount()"
   - label: TRIGGERED
-    value: mongo --quiet --host=localhost blog --eval "db.getCollection('posts').find({status:'INACTIVE'}).itcount()"
+    sample: mongo --quiet --host=localhost blog --eval "db.getCollection('posts').find({status:'INACTIVE'}).itcount()"
   - label: IN_PROCESS
-    value: echo 0
+    sample: echo 0
   - label: FAILED
-    value: mongo --quiet --host=localhost blog --eval "db.getCollection('posts').find({status:'ACTIVE'}).itcount()"
+    sample: mongo --quiet --host=localhost blog --eval "db.getCollection('posts').find({status:'ACTIVE'}).itcount()"
   - label: FINISHED
-    value: mongo --quiet --host=localhost blog --eval "db.getCollection('posts').find({status:'INACTIVE'}).itcount()"
+    sample: mongo --quiet --host=localhost blog --eval "db.getCollection('posts').find({status:'INACTIVE'}).itcount()"
 gauges:
 - title: YEAR PROGRESS
   position: [[53, 8], [27, 2]]
-  values:
+  cur:
-    cur: date +%j
+    sample: date +%j
-    max: echo 365
+  max:
-    min: echo 0
+    sample: echo 365
+  min:
+    sample: echo 0
 - title: DAY PROGRESS
   position: [[53, 10], [27, 2]]
-  values:
+  cur:
-    cur: date +%H
+    sample: date +%H
-    max: echo 24
+  max:
-    min: echo 0
+    sample: echo 24
+  min:
+    sample: echo 0
 - title: HOUR PROGRESS
   position: [[53, 12], [27, 2]]
-  values:
+  cur:
-    cur: date +%M
+    sample: date +%M
-    max: echo 60
+  max:
-    min: echo 0
+    sample: echo 60
+  min:
+    sample: echo 0
 - title: MINUTE PROGRESS
   position: [[53, 14], [27, 2]]
   triggers:
@@ -71,24 +79,26 @@ gauges:
     actions:
       sound: true
       script: say -v samantha `date +%I:%M%p`
-  values:
+  cur:
-    cur: date +%S
+    sample: date +%S
-    max: echo 60
+  max:
-    min: echo 0
+    sample: echo 60
+  min:
+    sample: echo 0
 asciiboxes:
 - title: LOCAL TIME
   position: [[53, 17], [27, 5]]
-  value: date +%r
+  sample: date +%r
 - title: UTC TIME
   position: [[53, 22], [27, 7]]
-  value: env TZ=UTC date +%r
+  sample: env TZ=UTC date +%r
   font: 3d
 sparklines:
 - title: CPU usage
   position: [[27, 22], [25, 7]]
   scale: 0
-  value: ps -A -o %cpu | awk '{s+=$1} END {print s}'
+  sample: ps -A -o %cpu | awk '{s+=$1} END {print s}'
 - title: Memory pages free
   position: [[27, 17], [25, 5]]
   scale: 0
-  value: memory_pressure | grep 'Pages free' | awk '{print $3}'
+  sample: memory_pressure | grep 'Pages free' | awk '{print $3}'

config/component.go

@@ -49,8 +49,9 @@ type GaugeConfig struct {
 	ComponentConfig `yaml:",inline"`
 	Scale           *int      `yaml:"scale,omitempty"`
 	Color           *ui.Color `yaml:"color,omitempty"`
-	Values          map[string]string `yaml:"values"`
+	Cur             Item      `yaml:"cur"`
-	Items           []Item            `yaml:",omitempty"`
+	Max             Item      `yaml:"max"`
+	Min             Item      `yaml:"min"`
 }
 
 type SparkLineConfig struct {
@@ -86,8 +87,10 @@ type LegendConfig struct {
 
 type Item struct {
 	Label           *string   `yaml:"label,omitempty"`
-	Script string    `yaml:"value"`
 	Color           *ui.Color `yaml:"color,omitempty"`
+	InitScript      *string   `yaml:"init,omitempty"`
+	SampleScript    *string   `yaml:"sample"`
+	TransformScript *string   `yaml:"transform,omitempty"`
 }
 
 type Location struct {

config/default.go

@@ -89,12 +89,15 @@ func (c *Config) setDefaultValues() {
 			p := defaultScale
 			g.Scale = &p
 		}
-		var items []Item
+
-		for label, script := range g.Values {
+		cur := "cur"
-			l := label
+		max := "max"
-			items = append(items, Item{Label: &l, Script: script})
+		min := "min"
-		}
+
-		g.Items = items
+		g.Cur.Label = &cur
+		g.Max.Label = &max
+		g.Min.Label = &min
+
 		c.Gauges[i] = g
 	}
 

data/item.go

@@ -10,7 +10,9 @@ import (
 
 type Item struct {
 	Label           string
-	Script string
+	SampleScript    string
+	InitScript      *string
+	TransformScript *string
 	Color           *ui.Color
 }
 
@@ -19,7 +21,12 @@ func NewItems(cfgs []config.Item) []Item {
 	items := make([]Item, 0)
 
 	for _, i := range cfgs {
-		item := Item{Label: *i.Label, Script: i.Script, Color: i.Color}
+		item := Item{
+			Label:           *i.Label,
+			SampleScript:    *i.SampleScript,
+			InitScript:      i.InitScript,
+			TransformScript: i.TransformScript,
+			Color:           i.Color}
 		items = append(items, item)
 	}
 
@@ -28,7 +35,7 @@ func NewItems(cfgs []config.Item) []Item {
 
 func (i *Item) nextValue(variables []string) (value string, err error) {
 
-	cmd := exec.Command("sh", "-c", i.Script)
+	cmd := exec.Command("sh", "-c", i.SampleScript)
 	cmd.Env = os.Environ()
 
 	for _, variable := range variables {

main.go

@@ -68,7 +68,7 @@ func main() {
 
 	for _, c := range cfg.Gauges {
 		cpt := gauge.NewGauge(c, palette)
-		starter.start(cpt, cpt.Consumer, c.ComponentConfig, c.Items, c.Triggers)
+		starter.start(cpt, cpt.Consumer, c.ComponentConfig, []config.Item{c.Cur, c.Min, c.Max}, c.Triggers)
 	}
 
 	handler := event.NewHandler(lout, opt)