new action: DeleteLines (#4)

Signed-off-by: Hadi <112569860+anotherhadi@users.noreply.github.com>

leak-utils/misc/deleteLines.go

@@ -0,0 +1,187 @@
+package misc
+
+import (
+	"bufio"
+	"fmt"
+	"os"
+	"strconv"
+	"strings"
+
+	"github.com/anotherhadi/eleakxir/leak-utils/settings"
+)
+
+func deleteXFirstLines(lu settings.LeakUtils, inputFile, outputFile string, x int) error {
+	in, err := os.Open(inputFile)
+	if err != nil {
+		return err
+	}
+	defer in.Close()
+
+	out, err := os.Create(outputFile)
+	if err != nil {
+		return err
+	}
+	defer out.Close()
+
+	scanner := bufio.NewScanner(in)
+	writer := bufio.NewWriter(out)
+	defer writer.Flush()
+
+	lineNum := 0
+	for scanner.Scan() {
+		lineNum++
+		if lineNum <= x {
+			continue
+		}
+		_, err := writer.WriteString(scanner.Text() + "\n")
+		if err != nil {
+			return err
+		}
+	}
+
+	return scanner.Err()
+}
+
+// Delete the last X lines of a file
+func deleteXLastLines(lu settings.LeakUtils, inputFile, outputFile string, x int) error {
+	in, err := os.Open(inputFile)
+	if err != nil {
+		return err
+	}
+	defer in.Close()
+
+	lines := []string{}
+	scanner := bufio.NewScanner(in)
+	for scanner.Scan() {
+		lines = append(lines, scanner.Text())
+	}
+	if err := scanner.Err(); err != nil {
+		return err
+	}
+
+	if x > len(lines) {
+		x = len(lines)
+	}
+
+	out, err := os.Create(outputFile)
+	if err != nil {
+		return err
+	}
+	defer out.Close()
+	writer := bufio.NewWriter(out)
+	defer writer.Flush()
+
+	for _, line := range lines[:len(lines)-x] {
+		_, err := writer.WriteString(line + "\n")
+		if err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
+
+// Print the first X lines of a file with index starting from 1
+func printFirstXLines(lu settings.LeakUtils, inputFile string, x int) error {
+	in, err := os.Open(inputFile)
+	if err != nil {
+		return err
+	}
+	defer in.Close()
+
+	scanner := bufio.NewScanner(in)
+	lineNum := 0
+	for scanner.Scan() && lineNum < x {
+		lineNum++
+		fmt.Println(settings.Muted.Render(fmt.Sprintf("%d: %s", lineNum, scanner.Text())))
+	}
+
+	return scanner.Err()
+}
+
+// Print the last X lines of a file with index starting from 1 from the bottom
+func printLastXLines(lu settings.LeakUtils, inputFile string, x int) error {
+	in, err := os.Open(inputFile)
+	if err != nil {
+		return err
+	}
+	defer in.Close()
+
+	lines := []string{}
+	scanner := bufio.NewScanner(in)
+	for scanner.Scan() {
+		lines = append(lines, scanner.Text())
+	}
+	if err := scanner.Err(); err != nil {
+		return err
+	}
+
+	// Si x est supérieur au nombre de lignes, on affiche tout
+	if x > len(lines) {
+		x = len(lines)
+	}
+
+	start := len(lines) - x
+	subLines := lines[start:]
+
+	// Affiche les lignes avec 1 en bas
+	for i := 0; i < len(subLines); i++ {
+		// index = nombre total de lignes affichées - position dans le slice
+		index := len(subLines) - i
+		fmt.Println(settings.Muted.Render(fmt.Sprintf("%d: %s", index, subLines[i])))
+	}
+
+	return nil
+}
+
+func DeleteFirstLines(lu settings.LeakUtils, inputFile, outputFile string, show int) error {
+	err := printFirstXLines(lu, inputFile, show)
+	if err != nil {
+		return err
+	}
+
+	reader := bufio.NewReader(os.Stdin)
+	fmt.Println(settings.Muted.Render("How many lines do you want to delete from the start? "))
+	input, err := reader.ReadString('\n')
+	if err != nil {
+		return err
+	}
+	input = strings.TrimSpace(input)
+	x, err := strconv.Atoi(input)
+	if err != nil {
+		return fmt.Errorf("bad input: %s", err)
+	}
+
+	err = deleteXFirstLines(lu, inputFile, outputFile, x)
+	if err != nil {
+		return err
+	}
+	return nil
+}
+
+func DeleteLastLines(lu settings.LeakUtils, inputFile, outputFile string, show int) error {
+	err := printLastXLines(lu, inputFile, show)
+	if err != nil {
+		return err
+	}
+
+	reader := bufio.NewReader(os.Stdin)
+	fmt.Println(settings.Muted.Render("How many lines do you want to delete from the end? "))
+	input, err := reader.ReadString('\n')
+	if err != nil {
+		return err
+	}
+	input = strings.TrimSpace(input)
+	x, err := strconv.Atoi(input)
+	if err != nil {
+		return fmt.Errorf("bad input: %s", err)
+	}
+
+	err = deleteXLastLines(lu, inputFile, outputFile, x)
+	if err != nil {
+		return err
+	}
+
+	fmt.Println(settings.Muted.Render(fmt.Sprintf("%d lines deleted from the end. Result saved to %s", x, outputFile)))
+	return nil
+}