do formatting to heading row of empty worksheet

.drone.sh

@@ -0,0 +1,15 @@
+#!/bin/sh
+
+# disable CGO for cross-compiling
+export CGO_ENABLED=0
+
+export now=$(TZ=Australia/Sydney date '+%Y%m%d-%H%M%S')
+echo $now
+#pwd
+#ls -lah ~
+#go env
+echo "build commences"
+go build -ldflags "-X main.sha1ver=`git rev-parse HEAD` -X main.buildTime=$now" -o json2excel
+echo "build complete"
+sha256sum json2excel > json2excel_checksum.txt
+ls -lah

.drone.yml

@@ -0,0 +1,30 @@
+kind: pipeline
+type: docker
+name: default
+
+# Docs at https://docs.drone.io/pipeline/exec/overview/
+# Also see https://github.com/harness/drone-cli/blob/master/.drone.yml
+
+steps:
+- name: build
+  image: golang
+  environment:
+    CGO_ENABLED: 0
+  commands:
+  - sh ./.drone.sh
+
+- name: dell-sftp-deploy
+  image: hypervtechnics/drone-sftp
+  settings:
+    host: deft.dell.com
+    username:
+      from_secret: DELLFTP_USER
+    password:
+      from_secret: DELLFTP_PASS
+    port: 22
+    source: ./
+    filter: json2excel*
+    clean: false
+    target: /
+    overwrite: true
+    verbose: true    

cmd/main/main.go

@@ -153,6 +153,53 @@ func main() {
 	// Get an interface that we can work with to access the sub elements
 	vslice := vislice.([]interface{})
 
+	if len(vslice) < 1 {
+		// There was no data but lets just log that and close off the empty workbook
+		fmt.Printf("No data found contained in top-level json key '%s', no work to do.\n", parentNode)
+
+		// Create new file
+		xlsx = createWorkbook(worksheetName, outputFilename)
+
+		// Run code to add column names to the first row of the workbook based off the keyOrder, if defined
+		if len(config.keyOrder) > 0 {
+			var columnHeadings []string
+			for _, value := range config.keyOrder {
+				columnHeadings = append(columnHeadings, value)
+			}
+			createHeadingRow(xlsx, worksheetName, columnHeadings)
+
+			headerStyle, err := xlsx.NewStyle(&excelize.Style{
+				Font: &excelize.Font{
+					Bold: true,
+				},
+			})
+			if err != nil {
+				fmt.Printf("Error generating header style : '%s'\n", err)
+			} else {
+				// Set the style if there was no error generating it
+				if boldTopRow {
+					err = xlsx.SetRowStyle(worksheetName, 1, 1, headerStyle)
+					if err != nil {
+						fmt.Printf("Error setting header style : '%s'\n", err)
+					}
+				}
+			}
+
+			if autoWidth {
+				err = SetColAutoWidth(xlsx, worksheetName)
+				if err != nil {
+					fmt.Printf("Error setting auto width : '%s'\n", err)
+				}
+			}
+		}
+
+		// Close off the file
+		if err := xlsx.SaveAs(outputFilename); err != nil {
+			log.Fatal(err)
+		}
+		return
+	}
+
 	// Check that the first element is what we expected
 	if _, ok := vslice[0].(orderedmap.OrderedMap); !ok {
 		error := fmt.Sprintf("Type of first vslice element is not an ordered map. It appears to be '%v'\n", reflect.TypeOf(vslice[0]))
@@ -196,13 +243,13 @@ func main() {
 	})
 	if err2 != nil {
 		fmt.Printf("Error generating header style : '%s'\n", err2)
-	}
-
-	// Set the style
-	if boldTopRow {
-		err = xlsx.SetRowStyle(worksheetName, 1, 1, headerStyle)
-		if err != nil {
-			fmt.Printf("Error setting header style : '%s'\n", err)
+	} else {
+		// Set the style if there was no error generating it
+		if boldTopRow {
+			err = xlsx.SetRowStyle(worksheetName, 1, 1, headerStyle)
+			if err != nil {
+				fmt.Printf("Error setting header style : '%s'\n", err)
+			}
 		}
 	}