Refactor task package layout for 4r0

1 files changed, 42 insertions, 0 deletions

diff --git a/internal/task/debug.go b/internal/task/debug.go
new file mode 100644
index 0000000..061dac2
--- /dev/null
+++ b/internal/task/debug.go
@@ -0,0 +1,42 @@
+package task
+
+import (
+	"io"
+	"os"
+)
+
+// debugConfig groups the optional debug-logging state for the task package.
+// Collecting related vars into a struct makes the mutable state explicit and
+// allows the logger to be swapped or reset cleanly without touching unrelated
+// package globals.
+type debugConfig struct {
+	writer io.Writer
+	file   *os.File // tracked separately so it can be closed on reconfiguration
+}
+
+// dbg holds the active debug-logging configuration for this package.
+// It is written only via SetDebugLog and read only in run().
+var dbg debugConfig
+
+// SetDebugLog enables logging of executed commands to the given file.
+// Passing an empty path disables logging and closes any previously opened file.
+func SetDebugLog(path string) error {
+	// Close existing debug file if open before re-configuring.
+	if dbg.file != nil {
+		_ = dbg.file.Close()
+		dbg.file = nil
+		dbg.writer = nil
+	}
+
+	if path == "" {
+		return nil
+	}
+
+	f, err := os.OpenFile(path, os.O_CREATE|os.O_WRONLY|os.O_APPEND, 0o644)
+	if err != nil {
+		return err
+	}
+	dbg.file = f
+	dbg.writer = f
+	return nil
+}