Create go version of main.py

User ID Parser/IdParser.go

@@ -0,0 +1,169 @@
+package main
+
+import (
+	"encoding/csv"
+	"errors"
+	"flag"
+	"fmt"
+	"io/ioutil"
+	"log"
+	"os"
+)
+
+// Variables used for command line parameters
+var (
+	CsvInput   string
+	CsvOutput  string
+	unique_old []string
+	unique_ids []string
+)
+
+func init() {
+
+	flag.StringVar(&CsvInput, "i", "", "Input csv or folder [required]")
+	flag.StringVar(&CsvOutput, "o", "out.csv", "Output CSV")
+	flag.Parse()
+}
+
+// struct for getting just user ID out of csv file
+type DiscordCSV struct {
+	UserID string
+}
+
+func main() {
+
+	// Check if there is no input and exits if true
+	if CsvInput == "" {
+		println("No input given, use -h for help on how to use this program")
+		os.Exit(0)
+	}
+
+	// Opens input and gets info
+	fileInfo, err := os.Stat(CsvInput)
+	if err != nil {
+		// error handling
+		println(err.Error())
+	}
+
+	// checks if input is directory or file
+	if fileInfo.IsDir() {
+		// file is a directory
+		files, err := ioutil.ReadDir(CsvInput)
+		if err != nil {
+			log.Fatal(err)
+		}
+
+		// For each file in folder
+		for _, file := range files {
+			if !file.IsDir() {
+				process(CsvInput + file.Name())
+			}
+
+		}
+
+	} else {
+		// file is not a directory
+		process(CsvInput)
+
+	}
+
+}
+
+func process(CsvPath string) {
+
+	if _, err := os.Stat(CsvOutput); err == nil {
+		// path/to/whatever exists
+
+		// Read CSV file
+		lines, err := ReadCsv(CsvOutput)
+		if err != nil {
+			panic(err)
+		}
+		// Loop through lines & turn into object
+		for _, line := range lines {
+			data := DiscordCSV{
+				UserID: line[0],
+			}
+			unique_old = append(unique_old, data.UserID)
+		}
+
+		WriteCSV(CsvPath)
+
+	} else if errors.Is(err, os.ErrNotExist) {
+		// path/to/whatever does *not* exist
+		OutFile, err := os.Create(CsvOutput)
+		if err != nil {
+			fmt.Println(err)
+			return
+		}
+		OutFile.Close()
+
+		WriteCSV(CsvPath)
+
+	} else {
+		// Schrodinger: file may or may not exist. See err for details.
+
+		// Therefore, do *NOT* use !os.IsNotExist(err) to test for file existence
+		println(err)
+	}
+
+}
+
+func WriteCSV(InFile string) {
+	// Create DiscordIDs list
+	var DiscordIDs []string
+
+	// Read CSV file
+	lines, err := ReadCsv(InFile)
+	if err != nil {
+		panic(err)
+	}
+
+	OutFile, err := os.OpenFile(CsvOutput, os.O_APPEND|os.O_WRONLY|os.O_CREATE, 0600)
+
+	// Loop through lines & add to DiscordIDs list
+	for _, line := range lines {
+		data := DiscordCSV{
+			UserID: line[0],
+		}
+		if !contains(DiscordIDs, data.UserID) {
+			DiscordIDs = append(DiscordIDs, data.UserID)
+		}
+	}
+
+	// Checks if ID is already in list
+	// if it isnt then it gets writen to list
+	for _, ID := range DiscordIDs {
+		if !contains(unique_old, ID) {
+			OutFile.WriteString(ID + "\n")
+		}
+	}
+}
+
+func ReadCsv(filename string) ([][]string, error) {
+
+	// Open CSV file
+	f, err := os.Open(filename)
+	if err != nil {
+		return [][]string{}, err
+	}
+	defer f.Close()
+
+	// Read File into a Variable
+	lines, err := csv.NewReader(f).ReadAll()
+	if err != nil {
+		return [][]string{}, err
+	}
+
+	return lines, nil
+}
+
+func contains(s []string, str string) bool {
+	for _, v := range s {
+		if v == str {
+			return true
+		}
+	}
+
+	return false
+}