This closes #1565, support adjust formula when instering columns and rows (#1567)

adjust.go

@@ -131,6 +131,7 @@ func (f *File) adjustColDimensions(ws *xlsxWorksheet, col, offset int) error {
 			if cellCol, cellRow, _ := CellNameToCoordinates(v.R); col <= cellCol {
 				if newCol := cellCol + offset; newCol > 0 {
 					ws.SheetData.Row[rowIdx].C[colIdx].R, _ = CoordinatesToCellName(newCol, cellRow)
+					_ = f.adjustFormula(ws.SheetData.Row[rowIdx].C[colIdx].F, columns, offset, false)
 				}
 			}
 		}
@@ -152,21 +153,46 @@ func (f *File) adjustRowDimensions(ws *xlsxWorksheet, row, offset int) error {
 	for i := 0; i < len(ws.SheetData.Row); i++ {
 		r := &ws.SheetData.Row[i]
 		if newRow := r.R + offset; r.R >= row && newRow > 0 {
-			f.adjustSingleRowDimensions(r, newRow)
+			f.adjustSingleRowDimensions(r, newRow, offset, false)
 		}
 	}
 	return nil
 }
 
 // adjustSingleRowDimensions provides a function to adjust single row dimensions.
-func (f *File) adjustSingleRowDimensions(r *xlsxRow, num int) {
+func (f *File) adjustSingleRowDimensions(r *xlsxRow, num, offset int, si bool) {
 	r.R = num
 	for i, col := range r.C {
 		colName, _, _ := SplitCellName(col.R)
 		r.C[i].R, _ = JoinCellName(colName, num)
+		_ = f.adjustFormula(col.F, rows, offset, si)
 	}
 }
 
+// adjustFormula provides a function to adjust shared formula reference.
+func (f *File) adjustFormula(formula *xlsxF, dir adjustDirection, offset int, si bool) error {
+	if formula != nil && formula.Ref != "" {
+		coordinates, err := rangeRefToCoordinates(formula.Ref)
+		if err != nil {
+			return err
+		}
+		if dir == columns {
+			coordinates[0] += offset
+			coordinates[2] += offset
+		} else {
+			coordinates[1] += offset
+			coordinates[3] += offset
+		}
+		if formula.Ref, err = f.coordinatesToRangeRef(coordinates); err != nil {
+			return err
+		}
+		if si && formula.Si != nil {
+			formula.Si = intPtr(*formula.Si + 1)
+		}
+	}
+	return nil
+}
+
 // adjustHyperlinks provides a function to update hyperlinks when inserting or
 // deleting rows or columns.
 func (f *File) adjustHyperlinks(ws *xlsxWorksheet, sheet string, dir adjustDirection, num, offset int) {

adjust_test.go

@@ -445,3 +445,23 @@ func TestAdjustCols(t *testing.T) {
 
 	assert.NoError(t, f.Close())
 }
+
+func TestAdjustFormula(t *testing.T) {
+	f := NewFile()
+	formulaType, ref := STCellFormulaTypeShared, "C1:C5"
+	assert.NoError(t, f.SetCellFormula("Sheet1", "C1", "=A1+B1", FormulaOpts{Ref: &ref, Type: &formulaType}))
+	assert.NoError(t, f.DuplicateRowTo("Sheet1", 1, 10))
+	assert.NoError(t, f.InsertCols("Sheet1", "B", 1))
+	assert.NoError(t, f.InsertRows("Sheet1", 1, 1))
+	for cell, expected := range map[string]string{"D2": "=A1+B1", "D3": "=A2+B2", "D11": "=A1+B1"} {
+		formula, err := f.GetCellFormula("Sheet1", cell)
+		assert.NoError(t, err)
+		assert.Equal(t, expected, formula)
+	}
+	assert.NoError(t, f.SaveAs(filepath.Join("test", "TestAdjustFormula.xlsx")))
+	assert.NoError(t, f.Close())
+
+	assert.NoError(t, f.adjustFormula(nil, rows, 0, false))
+	assert.Equal(t, f.adjustFormula(&xlsxF{Ref: "-"}, rows, 0, false), ErrParameterInvalid)
+	assert.Equal(t, f.adjustFormula(&xlsxF{Ref: "XFD1:XFD1"}, columns, 1, false), ErrColumnNumber)
+}

rows.go

@@ -662,7 +662,7 @@ func (f *File) DuplicateRowTo(sheet string, row, row2 int) error {
 	}
 
 	rowCopy.C = append(make([]xlsxC, 0, len(rowCopy.C)), rowCopy.C...)
-	f.adjustSingleRowDimensions(&rowCopy, row2)
+	f.adjustSingleRowDimensions(&rowCopy, row2, row2-row, true)
 
 	if idx2 != -1 {
 		ws.SheetData.Row[idx2] = rowCopy