make fileio module to make my life easier

pkg/fileio/fileio.go

@@ -0,0 +1,51 @@
+package fileio
+
+import (
+	"bufio"
+	"fmt"
+	"os"
+
+	"github.com/HikariKnight/ls-iommu/pkg/errorcheck"
+)
+
+// This just implements repetetive tasks I have to do with files
+
+func AppendContent(content string, fileName string) {
+	// Open the file
+	f, err := os.OpenFile(fileName, os.O_APPEND|os.O_WRONLY, os.ModePerm)
+	errorcheck.ErrorCheck(err, fmt.Sprintf("Error opening \"%s\" for writing", fileName))
+	defer f.Close()
+
+	// Write the content
+	_, err = f.WriteString(content)
+	errorcheck.ErrorCheck(err, fmt.Sprintf("Error writing to %s", fileName))
+}
+
+func ReadLines(fileName string) []string {
+	content, err := os.Open(fileName)
+	errorcheck.ErrorCheck(err, fmt.Sprintf("Error reading file %s", fileName))
+	defer content.Close()
+
+	// Make a list of lines
+	var lines []string
+
+	// Read the file line by line
+	scanner := bufio.NewScanner(content)
+	for scanner.Scan() {
+		lines = append(lines, scanner.Text())
+	}
+
+	// Return all the lines
+	return lines
+
+}
+
+func ReadFile(fileName string) string {
+	// Read the whole file
+	content, err := os.ReadFile(fileName)
+	errorcheck.ErrorCheck(err, fmt.Sprintf("Failed to ReadFile on %s", fileName))
+
+	// Return all the lines as one string
+	return string(content)
+
+}