1 files changed, 84 insertions, 0 deletions
diff --git a/internal/file/file.go b/internal/file/file.go
new file mode 100644
index 0000000..4d9afab
--- /dev/null
+++ b/internal/file/file.go
@@ -0,0 +1,84 @@
+package file
+
+import (
+	"fmt"
+	"os"
+	"strconv"
+	"strings"
+)
+
+type File interface {
+	String() string
+	Name() string
+}
+
+type FdFile struct {
+	fd   int32
+	name string
+}
+
+func NewFd(fd int32, name string) FdFile {
+	return FdFile{fd, name}
+}
+
+func NewFdWithPid(fd int32, pid uint32) FdFile {
+	if linkName, err := os.Readlink(fmt.Sprintf("/proc/%d/fd/%d", pid, fd)); err == nil {
+		return FdFile{fd, linkName}
+	}
+	return FdFile{fd, "?"}
+}
+
+func (f FdFile) Name() string {
+	return f.name
+}
+
+func (f FdFile) String() string {
+	var sb strings.Builder
+
+	if len(f.name) == 0 {
+		sb.WriteString("?")
+	} else {
+		sb.WriteString(f.name)
+		sb.WriteString(" (")
+		sb.WriteString(strconv.FormatInt(int64(f.fd), 10))
+		sb.WriteString(")")
+	}
+
+	return sb.String()
+}
+
+type OldnameNewnameFile struct {
+	Oldname, Newname string
+}
+
+func (f OldnameNewnameFile) Name() string {
+	return f.Newname
+}
+
+func (f OldnameNewnameFile) String() string {
+	var sb strings.Builder
+
+	sb.WriteString("old:")
+	sb.WriteString(f.Oldname)
+	sb.WriteString(" ->new:")
+	sb.WriteString(f.Newname)
+
+	return sb.String()
+}
+
+type PathnameFile struct {
+	Pathname string
+}
+
+func (f PathnameFile) Name() string {
+	return f.Pathname
+}
+
+func (f PathnameFile) String() string {
+	var sb strings.Builder
+
+	sb.WriteString("pathname:")
+	sb.WriteString(f.Pathname)
+
+	return sb.String()
+}