GolangのCUIライブラリを使ってExcelの中身を確認するツールを作ってみた

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package main

import (
        "fmt"
        "os"
        "strconv"

        "github.com/gdamore/tcell"
        "github.com/rivo/tview"
        "github.com/tealeg/xlsx"
)

func main() {
        app := tview.NewApplication()

        // Generate Sheet List Instance
        generateSheets := func() *tview.List {
                result := tview.NewList().ShowSecondaryText(false)
                result.SetBorder(true).SetTitle("Sheets")

                return result
        }
        sheets := generateSheets()

        // Generate Column Table Instance
        tables := tview.NewTable().SetBorders(true)
        tables.SetBorder(true).SetTitle("Contents")

        // Create Excel instance
        createExcelInstance := func(excelFileName string) *xlsx.File {
                xlFile, err := xlsx.OpenFile(excelFileName)
                if err != nil {
                        panic(err)
                }

                return xlFile
        }
        excel := createExcelInstance("./test.xlsx")

        // Add Sheets to Sheet List
        addSheets := func(sheets *tview.List, excelInstance *xlsx.File) {
                for _, sheet := range excelInstance.Sheets {
                        tmp := sheet

                        sheets.AddItem(tmp.Name, "", 0, func() {
                                // Clear the table
                                tables.Clear()

                                for i, row := range tmp.Rows {
                                        // Add row number:
                                        tables.SetCellSimple(i, 0, strconv.Itoa(i+1))

                                        for j, cell := range row.Cells {
                                                tables.SetCellSimple(i, j+1, cell.String())
                                        }
                                }

                                tables.ScrollToBeginning()
                                app.SetFocus(tables)
                        })

                        sheets.SetDoneFunc(func() {
                                app.Stop()
                                os.Exit(0)
                        })

                        tables.SetDoneFunc(func(key tcell.Key) {
                                switch key {
                                case tcell.KeyEscape:
                                        tables.Clear()
                                        app.SetFocus(sheets)
                                case tcell.KeyEnter:
                                        // Press Enter to select the rows
                                        tables.SetSelectable(true, false)
                                }
                        })

                        tables.SetSelectedFunc(func(row int, column int) {
                                for i := 0; i < tables.GetColumnCount(); i++ {
                                        tables.GetCell(row, i).SetTextColor(tcell.ColorRed)
                                }
                                tables.SetSelectable(false, false)
                        })
                }

        }
        addSheets(sheets, excel)

        flex := tview.NewFlex().
                AddItem(sheets, 0, 1, true).
                AddItem(tables, 0, 5, false)

        if err := app.SetRoot(flex, true).Run(); err != nil {
                fmt.Printf("Error running application: %s\n", err)
        }
}