csvcell.go

/*
MIT License

Copyright (c) 2025 Elliot Michael Keavney

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
*/

package csvcell

import (
	"bufio"
	"log"
	"os"
	"strings"
)

// Function to read a CSV file
func ReadCSV(rootDirPath string, fileName string) (result [][18278]string) {

	// Go introduced OpenRoot in version 1.24, it restricts file operations to a single directory
	rootDir, err := os.OpenRoot(rootDirPath)
	if err != nil {
		panic("Directory path does not exist")
	}

	defer rootDir.Close()

	// Open the file
	file, err := rootDir.Open(fileName)
	if err != nil {
		log.Fatal("File " + fileName + " cannot be opened or does not exist")
	}

	defer file.Close()

	scanner := bufio.NewScanner(file)

	// For loop to scan lines in the file and add to a slice
	for scanner.Scan() {
		line := scanner.Text()
		// Create a slice and split each line into an index based on the , delimiter
		var splitSlice = []string{}
		splitSlice = strings.Split(line, ",")
		// Convert splitSlice into an array named splitArray
		splitArray := [18278]string{}
		copy(splitArray[:], splitSlice)
		// Append to array
		result = append(result, splitArray)
	}

	if err := scanner.Err(); err != nil {
		log.Fatal(err)
	}
	return result
}

// Function to write to a CSV file
func WriteCSV(rootDirPath string, fileName string, commaPrepend int, csvRow string, commaAppend int) {

	// Go introduced OpenRoot in version 1.24, it restricts file operations to a single directory
	rootDir, err := os.OpenRoot(rootDirPath)
	if err != nil {
		panic("Directory path does not exist")
	}

	defer rootDir.Close()

	// Open/create the file
	file, err := rootDir.OpenFile(fileName, os.O_APPEND|os.O_CREATE|os.O_WRONLY, 0644)
	if err != nil {
		log.Fatal("File " + fileName + " cannot be opened or does not exist")
	}

	defer file.Close()

	// Write the string to the file and add optional commas at the beginning or end of the row
	_, err = file.WriteString(strings.Repeat(",", commaPrepend) + csvRow + strings.Repeat(",", commaAppend) + "\n")
	if err != nil {
		panic(err)
	}
}

// Function to retrieve all contents from a plain text file
func FileData(rootDirPath string, fileName string) (result string) {

	// Go introduced OpenRoot in version 1.24, it restricts file operations to a single directory
	rootDir, err := os.OpenRoot(rootDirPath)

	if err != nil {
		panic("Directory path does not exist")
	}

	defer rootDir.Close()

	file, err := rootDir.Open(fileName)

	if err != nil {
		log.Fatal(err)
	}

	defer file.Close()

	scanner := bufio.NewScanner(file)

	var fileSlice []string

	for scanner.Scan() {
		line := scanner.Text()
		fileSlice = append(fileSlice, line)
	}

	result = strings.Join(fileSlice, "")
	return result
}

// Function to retrieve all file and directory names from a specific directory
func DirList(rootDirPath string) (result []string) {
	rootDir, err := os.Open(rootDirPath)

	if err != nil {
		panic("Directory path does not exist")
	}

	defer rootDir.Close()

	fileList, err := rootDir.ReadDir(-1)

	if err != nil {
		log.Fatal(err)
	}

	for _, fileListLoop := range fileList {
		result = append(result, fileListLoop.Name())
	}
	return result
}