add some features controlled by command line

.gitignore

@@ -1,2 +1,8 @@
 # Ignore any generated xlsx documents
-*.xlsx
+*.xlsx
+
+# Ignore compiled binary
+json2excel
+
+# Ignore test data
+*.json

cmd/main/main.go

@@ -2,6 +2,7 @@ package main
 
 import (
 	"encoding/json"
+	"flag"
 	"fmt"
 	"log"
 	"os"
@@ -13,10 +14,27 @@ import (
 // Initial concept from https://stackoverflow.com/q/68621039
 
 func main() {
-	jsonFile := "test.json"
+	//jsonFile := "test.json"
 	parentNode := "input"
-	sheetName := "Sheet2"
+	//worksheetName := "Sheet2"
-	outputFilename := "test.xlsx"
+	//outputFilename := "test.xlsx"
+
+	// Command line arguments
+	var inputJson string
+	var worksheetName string
+	var outputFilename string
+	var boldTopRow bool
+	var freezeTopRow bool
+	var autoFilter bool
+
+	// Process command line arguments
+	flag.StringVar(&inputJson, "inputJson", "./input.json", "Full path to input json data file")
+	flag.StringVar(&outputFilename, "outputFilename", "./output.xlsx", "Filename for excel worksheet output")
+	flag.StringVar(&worksheetName, "worksheetName", "Sheet1", "Label to set on worksheet")
+	flag.BoolVar(&boldTopRow, "bold-toprow", true, "Sets the top row of the worksheet to bold")
+	flag.BoolVar(&freezeTopRow, "freeze-toprow", true, "Freezes the first row of the Excel worksheet")
+	flag.BoolVar(&autoFilter, "autofilter", true, "Sets the auto filter on the first row")
+	flag.Parse()
 
 	var xlsx *excelize.File
 	var s []byte
@@ -27,7 +45,7 @@ func main() {
 	var cell string
 	var row, column int
 
-	// TODO - truncate sheetName to the maximum 31 characters
+	// TODO - truncate worksheetName to the maximum 31 characters
 
 	// Check if xlsx file exists already, and if it does then open and append data
 	if fileExists(outputFilename) {
@@ -35,23 +53,23 @@ func main() {
 		xlsx, err = excelize.OpenFile(outputFilename)
 		if err != nil {
 			fmt.Println(err)
-			return
+			os.Exit(1)
 		}
 
 		// Since we have an existing workbook, check if the sheet we want to write to already exists
 		sheetFound := false
 		for index, name := range xlsx.GetSheetMap() {
-			if name == sheetName {
+			if name == worksheetName {
-				fmt.Printf("Found worksheet '%s' at index '%d'\n", sheetName, index)
+				fmt.Printf("Found worksheet '%s' at index '%d'\n", worksheetName, index)
 				sheetFound = true
 			}
 		}
 		if !sheetFound {
 			// Create the sheet
-			fmt.Printf("Creating worksheet '%s'\n", sheetName)
+			fmt.Printf("Creating worksheet '%s'\n", worksheetName)
-			sheetIndex, err = xlsx.NewSheet(sheetName)
+			sheetIndex, err = xlsx.NewSheet(worksheetName)
 			if err != nil {
-				fmt.Printf("Error creating worksheet '%s' : %s\n", sheetName, err)
+				fmt.Printf("Error creating worksheet '%s' : %s\n", worksheetName, err)
 			}
 			// Set active worksheet
 			fmt.Printf("Setting active sheet to index %d", sheetIndex)
@@ -64,26 +82,27 @@ func main() {
 		xlsx = excelize.NewFile()
 
 		// Rename the default Sheet1 to this worksheet name
-		if sheetName != "Sheet1" {
+		if worksheetName != "Sheet1" {
-			fmt.Printf("Renaming default worksheet to '%s'\n", sheetName)
+			fmt.Printf("Renaming default worksheet to '%s'\n", worksheetName)
-			err = xlsx.SetSheetName("Sheet1", sheetName)
+			err = xlsx.SetSheetName("Sheet1", worksheetName)
 			if err != nil {
-				fmt.Printf("Error setting sheet name to '%s': %s\n", sheetName, err)
+				fmt.Printf("Error setting sheet name to '%s': %s\n", worksheetName, err)
 			}
 		}
 	}
 
 	// Read the json input file
-	if fileExists(jsonFile) {
+	if fileExists(inputJson) {
-		s, err = os.ReadFile(jsonFile)
+		s, err = os.ReadFile(inputJson)
 		if err != nil {
 			panic(err)
 		}
 	} else {
-		fmt.Printf("Input JSON file '%s' does not exist.\n", jsonFile)
+		fmt.Printf("Input JSON file '%s' does not exist.\n", inputJson)
+		os.Exit(1)
 	}
 
-	// Read the json into an orderedmap to preserve the ordering of json structure
+	// Unmarshal the json into an orderedmap to preserve the ordering of json structure
 	o := orderedmap.New()
 	err = json.Unmarshal([]byte(s), &o)
 	if err != nil {
@@ -92,15 +111,15 @@ func main() {
 
 	// Assume that our content is within the first top-level key
 	topLevel := o.Keys()
-	fmt.Printf("topLevel: %v\n", topLevel)
+	fmt.Printf("Detected toplevel json key as: '%s'\n", topLevel[0])
 	parentNode = topLevel[0]
 
 	// Get a reference to the top level node we specified earlier
-	// TODO - validate this key exists
 	vislice, ok := o.Get(parentNode)
 	if !ok {
 		fmt.Printf("Missing key for multitype array")
 	}
+	// Get an interface that we can work with to access the sub elements
 	vslice := vislice.([]interface{})
 
 	// Get the keys for the first element so we know what the column names will be
@@ -108,22 +127,70 @@ func main() {
 	columnNames := columnMap.Keys()
 	fmt.Printf("Creating excel workbook with following headings : '%v'\n", columnNames)
 
-	// Add the header row
+	// Set the style for the header values
+	// Just handling bold for now but we can do other styles too as per https://xuri.me/excelize/en/style.html#NewStyle
+	headerStyle, err2 := xlsx.NewStyle(&excelize.Style{
+		Font: &excelize.Font{
+			Bold: boldTopRow,
+		},
+	})
+	if err2 != nil {
+		fmt.Printf("Error generating header style : '%s'\n", err2)
+	}
+
 	row = 1
 	column = 1
+
+	// Set the style
+	err = xlsx.SetRowStyle(worksheetName, row, row, headerStyle)
+	if err != nil {
+		fmt.Printf("Error setting header style : '%s'\n", err)
+	}
+
+	// Add the header row
 	for i := 0; i < len(columnNames); i++ {
 		cell, _ = excelize.CoordinatesToCellName(column, row)
 		fmt.Printf("Setting cell %s to value %s\n", cell, columnNames[i])
-		xlsx.SetCellValue(sheetName, cell, columnNames[i])
+		xlsx.SetCellValue(worksheetName, cell, columnNames[i])
+		//xlsx.SetCellStyle(worksheetName, cell, cell, headerStyle)
 		column++
 	}
 
+	// Freeze top row if requested, see https://xuri.me/excelize/en/utils.html#SetPanes
+	if freezeTopRow {
+		err = xlsx.SetPanes(worksheetName, &excelize.Panes{
+			Freeze:      true,
+			Split:       false,
+			XSplit:      0,
+			YSplit:      1,
+			TopLeftCell: "A2",
+			ActivePane:  "bottomLeft",
+			Panes: []excelize.PaneOptions{
+				{SQRef: "A2", ActiveCell: "A2", Pane: "bottomLeft"},
+			},
+		})
+		if err != nil {
+			fmt.Printf("Error freezing top row : '%s'\n", err)
+		}
+	}
+
+	// Handle autofilter
+	if autoFilter {
+		// cell is still a reference to the last cell in the header row
+		filterRange := "A1:" + cell
+		fmt.Printf("Setting autofilter to range '%s'\n", filterRange)
+		err = xlsx.AutoFilter(worksheetName, filterRange, nil)
+		if err != nil {
+			fmt.Printf("Error setting autofilter : '%s'\n", err)
+		}
+	}
+
+	// Now process the remaining data in our json input
 	// Set starting row for data
 	row = 2
 
-	fmt.Printf("Adding %d rows of data to spreadsheet.\n", len(vslice))
-
 	// Iterate the whole slice to get the data and add to the worksheet
+	fmt.Printf("Adding %d rows of data to spreadsheet.\n", len(vslice))
 	for i, v := range vslice {
 		// Print the contents each slice
 		//fmt.Printf("'%d' : '%v'\n", i, v)
@@ -145,7 +212,7 @@ func main() {
 
 			e, _ := vmap.Get(k[j])
 			//fmt.Printf("Setting cell %s to value %v\n", cell, e)
-			xlsx.SetCellValue(sheetName, cell, e)
+			xlsx.SetCellValue(worksheetName, cell, e)
 
 			// Move to the next column
 			//asciiValue++

cmd/main/main.go.txt

@@ -1,108 +0,0 @@
-package main
-
-import (
-	"bytes"
-	"encoding/json"
-	"errors"
-	"fmt"
-	"io/ioutil"
-
-	"github.com/xuri/excelize/v2"
-)
-
-// Initial concept from https://stackoverflow.com/q/68621039
-
-var end = errors.New("invalid end of array or object")
-
-func main() {
-	file, err := ioutil.ReadFile("test.json")
-	if err != nil {
-		panic(err)
-	}
-
-	testkey, err := objectKeys([]byte(file))
-	fmt.Println(testkey, err)
-	return
-
-	var data interface{}
-	json.Unmarshal(file, &data) // reading all json data
-	//fmt.Println(data)
-	t, ok := data.([]interface{}) // assertion Interface
-	_ = ok
-	//fmt.Printf("%[1]v  %[1]T\n", t) //map[string]interface {}
-
-	myMap := t[0] // aim here to get APP, Company and Category which will be the column name of Excel sheet
-	fmt.Printf("myMap: %v\n", myMap)
-	columnData, _ := myMap.(map[string]interface{}) // extract the underlying concrete data from interface
-	fmt.Printf("columnData: %v\n", columnData)
-	keys := make([]string, 0, len(columnData)) // creating and initializing slice to store column
-	for k := range columnData {
-		fmt.Printf("%[1]v %[1]T\n", k)
-		keys = append(keys, k)
-	}
-
-	return
-
-	xlsx := excelize.NewFile()
-	sheetName := "Sheet1"
-	xlsx.SetSheetName(xlsx.GetSheetName(1), sheetName)
-	c := 'A'
-	asciiValue := int(c)
-	var a string
-	for i := 0; i < len(keys); i++ {
-		a = string(asciiValue)
-		xlsx.SetCellValue(sheetName, a+"1", keys[i])
-		asciiValue++
-	}
-	err = xlsx.SaveAs("./Onkar.xlsx")
-	if err != nil {
-		fmt.Println(err)
-		return
-	}
-	fmt.Println("Excel file generated sucessfully")
-}
-
-func objectKeys(b []byte) ([]string, error) {
-	d := json.NewDecoder(bytes.NewReader(b))
-	t, err := d.Token()
-	if err != nil {
-		return nil, err
-	}
-	if t != json.Delim('{') {
-		return nil, errors.New("expected start of object")
-	}
-	var keys []string
-	for {
-		t, err := d.Token()
-		if err != nil {
-			return nil, err
-		}
-		if t == json.Delim('}') {
-			return keys, nil
-		}
-		keys = append(keys, t.(string))
-		if err := skipValue(d); err != nil {
-			return nil, err
-		}
-	}
-}
-func skipValue(d *json.Decoder) error {
-	t, err := d.Token()
-	if err != nil {
-		return err
-	}
-	switch t {
-	case json.Delim('['), json.Delim('{'):
-		for {
-			if err := skipValue(d); err != nil {
-				if err == end {
-					break
-				}
-				return err
-			}
-		}
-	case json.Delim(']'), json.Delim('}'):
-		return end
-	}
-	return nil
-}

internal/ordered/go.mod.txt

@@ -1,3 +0,0 @@
-module ordered
-
-go 1.19

internal/ordered/ordered.go.txt

@@ -1,267 +0,0 @@
-// Package ordered provided a type OrderedMap for use in JSON handling
-// although JSON spec says the keys order of an object should not matter
-// but sometimes when working with particular third-party proprietary code
-// which has incorrect using the keys order, we have to maintain the object keys
-// in the same order of incoming JSON object, this package is useful for these cases.
-//
-// Disclaimer:
-// same as Go's default [map](https://blog.golang.org/go-maps-in-action),
-// this OrderedMap is not safe for concurrent use, if need atomic access, may use a sync.Mutex to synchronize.
-package ordered
-
-// Refers
-//  JSON and Go        https://blog.golang.org/json-and-go
-//  Go-Ordered-JSON    https://github.com/virtuald/go-ordered-json
-//  Python OrderedDict https://github.com/python/cpython/blob/2.7/Lib/collections.py#L38
-//  port OrderedDict   https://github.com/cevaris/ordered_map
-
-import (
-	"bytes"
-	"container/list"
-	"encoding/json"
-	"fmt"
-	"io"
-)
-
-// the key-value pair type, for initializing from a list of key-value pairs, or for looping entries in the same order
-type KVPair struct {
-	Key   string
-	Value interface{}
-}
-
-type m map[string]interface{}
-
-// the OrderedMap type, has similar operations as the default map, but maintained
-// the keys order of inserted; similar to map, all single key operations (Get/Set/Delete) runs at O(1).
-type OrderedMap struct {
-	m
-	l    *list.List
-	keys map[string]*list.Element // the double linked list for delete and lookup to be O(1)
-}
-
-// Create a new OrderedMap
-func NewOrderedMap() *OrderedMap {
-	return &OrderedMap{
-		m:    make(map[string]interface{}),
-		l:    list.New(),
-		keys: make(map[string]*list.Element),
-	}
-}
-
-// Create a new OrderedMap and populate from a list of key-value pairs
-func NewOrderedMapFromKVPairs(pairs []*KVPair) *OrderedMap {
-	om := NewOrderedMap()
-	for _, pair := range pairs {
-		om.Set(pair.Key, pair.Value)
-	}
-	return om
-}
-
-// return all keys
-// func (om *OrderedMap) Keys() []string { return om.keys }
-
-// set value for particular key, this will remember the order of keys inserted
-// but if the key already exists, the order is not updated.
-func (om *OrderedMap) Set(key string, value interface{}) {
-	if _, ok := om.m[key]; !ok {
-		om.keys[key] = om.l.PushBack(key)
-	}
-	om.m[key] = value
-}
-
-// Check if value exists
-func (om *OrderedMap) Has(key string) bool {
-	_, ok := om.m[key]
-	return ok
-}
-
-// Get value for particular key, or nil if not exist; but don't rely on nil for non-exist; should check by Has or GetValue
-func (om *OrderedMap) Get(key string) interface{} {
-	return om.m[key]
-}
-
-// Get value and exists together
-func (om *OrderedMap) GetValue(key string) (value interface{}, ok bool) {
-	value, ok = om.m[key]
-	return
-}
-
-// deletes the element with the specified key (m[key]) from the map. If there is no such element, this is a no-op.
-func (om *OrderedMap) Delete(key string) (value interface{}, ok bool) {
-	value, ok = om.m[key]
-	if ok {
-		om.l.Remove(om.keys[key])
-		delete(om.keys, key)
-		delete(om.m, key)
-	}
-	return
-}
-
-// Iterate all key/value pairs in the same order of object constructed
-func (om *OrderedMap) EntriesIter() func() (*KVPair, bool) {
-	e := om.l.Front()
-	return func() (*KVPair, bool) {
-		if e != nil {
-			key := e.Value.(string)
-			e = e.Next()
-			return &KVPair{key, om.m[key]}, true
-		}
-		return nil, false
-	}
-}
-
-// Iterate all key/value pairs in the reverse order of object constructed
-func (om *OrderedMap) EntriesReverseIter() func() (*KVPair, bool) {
-	e := om.l.Back()
-	return func() (*KVPair, bool) {
-		if e != nil {
-			key := e.Value.(string)
-			e = e.Prev()
-			return &KVPair{key, om.m[key]}, true
-		}
-		return nil, false
-	}
-}
-
-// this implements type json.Marshaler interface, so can be called in json.Marshal(om)
-func (om *OrderedMap) MarshalJSON() (res []byte, err error) {
-	res = append(res, '{')
-	front, back := om.l.Front(), om.l.Back()
-	for e := front; e != nil; e = e.Next() {
-		k := e.Value.(string)
-		res = append(res, fmt.Sprintf("%q:", k)...)
-		var b []byte
-		b, err = json.Marshal(om.m[k])
-		if err != nil {
-			return
-		}
-		res = append(res, b...)
-		if e != back {
-			res = append(res, ',')
-		}
-	}
-	res = append(res, '}')
-	// fmt.Printf("marshalled: %v: %#v\n", res, res)
-	return
-}
-
-// this implements type json.Unmarshaler interface, so can be called in json.Unmarshal(data, om)
-func (om *OrderedMap) UnmarshalJSON(data []byte) error {
-	dec := json.NewDecoder(bytes.NewReader(data))
-	dec.UseNumber()
-
-	// must open with a delim token '{'
-	t, err := dec.Token()
-	if err != nil {
-		return err
-	}
-	if delim, ok := t.(json.Delim); !ok || delim != '{' {
-		return fmt.Errorf("expect JSON object open with '{'")
-	}
-
-	err = om.parseobject(dec)
-	if err != nil {
-		return err
-	}
-
-	t, err = dec.Token()
-	if err != io.EOF {
-		return fmt.Errorf("expect end of JSON object but got more token: %T: %v or err: %v", t, t, err)
-	}
-
-	return nil
-}
-
-func (om *OrderedMap) parseobject(dec *json.Decoder) (err error) {
-	var t json.Token
-	for dec.More() {
-		t, err = dec.Token()
-		if err != nil {
-			return err
-		}
-
-		key, ok := t.(string)
-		if !ok {
-			return fmt.Errorf("expecting JSON key should be always a string: %T: %v", t, t)
-		}
-
-		t, err = dec.Token()
-		if err == io.EOF {
-			break
-		} else if err != nil {
-			return err
-		}
-
-		var value interface{}
-		value, err = handledelim(t, dec)
-		if err != nil {
-			return err
-		}
-
-		// om.keys = append(om.keys, key)
-		om.keys[key] = om.l.PushBack(key)
-		om.m[key] = value
-	}
-
-	t, err = dec.Token()
-	if err != nil {
-		return err
-	}
-	if delim, ok := t.(json.Delim); !ok || delim != '}' {
-		return fmt.Errorf("expect JSON object close with '}'")
-	}
-
-	return nil
-}
-
-func parsearray(dec *json.Decoder) (arr []interface{}, err error) {
-	var t json.Token
-	arr = make([]interface{}, 0)
-	for dec.More() {
-		t, err = dec.Token()
-		if err != nil {
-			return
-		}
-
-		var value interface{}
-		value, err = handledelim(t, dec)
-		if err != nil {
-			return
-		}
-		arr = append(arr, value)
-	}
-	t, err = dec.Token()
-	if err != nil {
-		return
-	}
-	if delim, ok := t.(json.Delim); !ok || delim != ']' {
-		err = fmt.Errorf("expect JSON array close with ']'")
-		return
-	}
-
-	return
-}
-
-func handledelim(t json.Token, dec *json.Decoder) (res interface{}, err error) {
-	if delim, ok := t.(json.Delim); ok {
-		switch delim {
-		case '{':
-			om2 := NewOrderedMap()
-			err = om2.parseobject(dec)
-			if err != nil {
-				return
-			}
-			return om2, nil
-		case '[':
-			var value []interface{}
-			value, err = parsearray(dec)
-			if err != nil {
-				return
-			}
-			return value, nil
-		default:
-			return nil, fmt.Errorf("Unexpected delimiter: %q", delim)
-		}
-	}
-	return t, nil
-}