basic config validation added

config/validator.go

@@ -1,10 +1,55 @@
 package config
 
-/*
+import (
- TODO validation
+	"fmt"
- - title uniquness and mandatory within a single type of widget
+	"github.com/sqshq/sampler/console"
- - label uniqueness and mandatory (if > 1 data bullets)
+)
-*/
+
 func (c *Config) validate() {
 
+	var components []ComponentConfig
+
+	for _, c := range c.RunCharts {
+		components = append(components, c.ComponentConfig)
+		validateLabelsUniqueness(c.Title, c.Items)
+	}
+	for _, c := range c.BarCharts {
+		components = append(components, c.ComponentConfig)
+		validateLabelsUniqueness(c.Title, c.Items)
+	}
+	for _, c := range c.SparkLines {
+		components = append(components, c.ComponentConfig)
+	}
+	for _, c := range c.Gauges {
+		components = append(components, c.ComponentConfig)
+	}
+	for _, c := range c.AsciiBoxes {
+		components = append(components, c.ComponentConfig)
+	}
+	for _, c := range c.TextBoxes {
+		components = append(components, c.ComponentConfig)
+	}
+
+	validateTitlesUniqueness(components)
+}
+
+func validateLabelsUniqueness(title string, items []Item) {
+	labels := make(map[string]bool)
+	for _, c := range items {
+		label := *c.Label
+		if _, contains := labels[label]; contains {
+			console.Exit(fmt.Sprintf("Config validation error: item labels should be unique. Please rename '%s' in '%s'", label, title))
+		}
+		labels[label] = true
+	}
+}
+
+func validateTitlesUniqueness(components []ComponentConfig) {
+	titles := make(map[string]bool)
+	for _, c := range components {
+		if _, contains := titles[c.Title]; contains {
+			console.Exit(fmt.Sprintf("Config validation error: component titles should be unique. Please rename '%s'", c.Title))
+		}
+		titles[c.Title] = true
+	}
 }

example.yml

@@ -112,6 +112,7 @@ textboxes:
     rate-ms: 10000
     sample: curl wttr.in/newyork?0ATQF
     border: false
+    transform: echo 1
   - title: San Francisco weather
     position: [[17, 30], [13, 7]]
     rate-ms: 10000