WTF-986 Dynamically display droplet attributes based on defined column names

Signed-off-by: Chris Cummer <chriscummer@me.com>

modules/digitalocean/display.go

@@ -2,33 +2,65 @@ package digitalocean
 
 import (
 	"fmt"
-	"strings"
 
 	"github.com/wtfutil/wtf/utils"
 )
 
+const maxColWidth = 10
+
+// defaultColumns defines the default set of columns to display in the widget
+// This can be over-ridden in the cofig by explicitly defining a set of columns
+var defaultColumns = []string{
+	"Name",
+	"Status",
+	"Vcpus",
+	"Disk",
+	"Memory",
+	"Region.Slug",
+}
+
 func (widget *Widget) content() (string, string, bool) {
 	title := widget.CommonSettings().Title
 	if widget.err != nil {
 		return title, widget.err.Error(), true
 	}
 
-	str := fmt.Sprintf(
-		" [%s]Droplets\n\n",
-		widget.settings.common.Colors.Subheading,
-	)
+	if len(defaultColumns) < 1 {
+		return title, " no columns defined", false
+	}
+
+	str := fmt.Sprintf(" [::b][%s]", widget.settings.common.Colors.Subheading)
+
+	for _, colName := range defaultColumns {
+		truncName := utils.Truncate(colName, maxColWidth, false)
+
+		str += fmt.Sprintf("%-10s", truncName)
+	}
+
+	str += "\n"
 
 	for idx, droplet := range widget.droplets {
-		dropletName := droplet.Name
+		// This defines the formatting for the row, one tab-seperated string
+		// for each defined column
+		fmtStr := " [%s]"
+		for range defaultColumns {
+			fmtStr += "%-10s"
+		}
 
-		row := fmt.Sprintf(
-			"[%s] %-8s %-24s %s",
+		vals := []interface{}{
 			widget.RowColor(idx),
-			droplet.Status,
-			dropletName,
-			utils.Truncate(strings.Join(droplet.Tags, ","), 24, true),
-		)
+		}
 
+		// Dynamically access the droplet to get the requested columns values
+		for _, colName := range defaultColumns {
+			val := droplet.ValueForColumn(colName)
+			truncVal := utils.Truncate(val, maxColWidth, false)
+
+			vals = append(vals, truncVal)
+		}
+
+		// And format, print, and color the row
+		row := fmt.Sprintf(fmtStr, vals...)
 		str += utils.HighlightableHelper(widget.View, row, idx, 33)
 	}
 

modules/digitalocean/droplet.go

@@ -1,17 +1,87 @@
 package digitalocean
 
-import "github.com/digitalocean/godo"
+import (
+	"fmt"
+	"reflect"
+	"strings"
+
+	"github.com/digitalocean/godo"
+)
 
 // Droplet represents WTF's view of a DigitalOcean droplet
 type Droplet struct {
 	godo.Droplet
+
+	Image  Image
+	Region Region
+}
+
+// Image represents WTF's view of a DigitalOcean droplet image
+type Image struct {
+	godo.Image
+}
+
+// Region represents WTF's view of a DigitalOcean region
+type Region struct {
+	godo.Region
 }
 
 // NewDroplet creates and returns an instance of Droplet
 func NewDroplet(doDroplet godo.Droplet) *Droplet {
 	droplet := &Droplet{
 		doDroplet,
+
+		Image{
+			*doDroplet.Image,
+		},
+
+		Region{
+			*doDroplet.Region,
+		},
 	}
 
 	return droplet
 }
+
+// ValueForColumn returns a string value for the given column
+func (drop *Droplet) ValueForColumn(colName string) string {
+	r := reflect.ValueOf(drop)
+	f := reflect.Indirect(r).FieldByName(colName)
+
+	var strVal string
+
+	// Figure out if we should forward this property to a sub-object
+	// Lets us support "Region.Name" column definitions
+	split := strings.Split(colName, ".")
+
+	switch split[0] {
+	case "Image":
+		strVal = drop.Image.ValueForColumn(split[1])
+	case "Region":
+		strVal = drop.Region.ValueForColumn(split[1])
+	default:
+		strVal = fmt.Sprintf("%v", f)
+	}
+
+	return strVal
+}
+
+// ValueForColumn returns a string value for the given column
+func (reg *Image) ValueForColumn(colName string) string {
+	r := reflect.ValueOf(reg)
+	f := reflect.Indirect(r).FieldByName(colName)
+
+	strVal := fmt.Sprintf("%v", f)
+
+	return strVal
+}
+
+// ValueForColumn returns a string value for the given column
+func (reg *Region) ValueForColumn(colName string) string {
+	r := reflect.ValueOf(reg)
+	f := reflect.Indirect(r).FieldByName(colName)
+
+	strVal := fmt.Sprintf("%v", f)
+
+	return strVal
+}

utils/text.go

@@ -77,12 +77,13 @@ func Truncate(src string, maxLen int, withEllipse bool) string {
 	return src
 }
 
-// Formats number as string with 1000 delimiters and, if necessary, rounds it to 2 decimals
+// PrettyNumber formats number as string with 1000 delimiters and, if necessary, rounds it to 2 decimals
 func PrettyNumber(number float64) string {
 	p := message.NewPrinter(language.English)
+
 	if number == math.Trunc(number) {
 		return p.Sprintf("%.0f", number)
-	} else {
+	}
+
 	return p.Sprintf("%.2f", number)
 }
-}