chore: Add simple parsers for journald and tail files

internal/parser/tail.go

@@ -0,0 +1,39 @@
+package parser
+
+import (
+	"bufio"
+	"errors"
+	"fmt"
+	"os"
+	"os/exec"
+)
+
+func ParseFile(path string) (Parser, error) {
+	if path == "" {
+		return Parser{}, errors.New("path cannot be empty")
+	}
+
+	if _, err := os.Stat(path); os.IsNotExist(err) {
+		return Parser{}, fmt.Errorf("file does not exist: %s", path)
+	}
+
+	cmd := exec.Command("tail", "-F", "-n", "10", path)
+
+	stdout, err := cmd.StdoutPipe()
+	if err != nil {
+		return Parser{}, fmt.Errorf("stdout pipe error: %w", err)
+	}
+
+	if err := cmd.Start(); err != nil {
+		return Parser{}, fmt.Errorf("failed to start tail parser: %w", err)
+	}
+
+	p := Parser{
+		parser: bufio.NewScanner(stdout),
+		ch:     make(chan string, 100),
+		cmd:    cmd,
+		file:   &path,
+	}
+
+	return p, nil
+}