diff --git a/events/go.mod b/events/go.mod
new file mode 100644
index 0000000..ec36a11
--- /dev/null
+++ b/events/go.mod
@@ -0,0 +1,5 @@
+module gitea.codeblob.work/pk/gut/events
+
+go 1.22.0
+
+require github.com/google/uuid v1.6.0
diff --git a/events/go.sum b/events/go.sum
new file mode 100644
index 0000000..7790d7c
--- /dev/null
+++ b/events/go.sum
@@ -0,0 +1,2 @@
+github.com/google/uuid v1.6.0 h1:NIvaJDMOsjHA8n1jAhLSgzrAzy1Hgr+hNrb57e+94F0=
+github.com/google/uuid v1.6.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
diff --git a/events/simple_emitter.go b/events/simple_emitter.go
new file mode 100644
index 0000000..4ea9011
--- /dev/null
+++ b/events/simple_emitter.go
@@ -0,0 +1,56 @@
+package events
+
+import (
+	"sync"
+
+	"github.com/google/uuid"
+)
+
+type syncEventListener struct {
+	id string
+	cb func(event string, data any)
+}
+
+type SyncEmitter struct {
+	sync.Mutex
+	listeners map[string][]syncEventListener
+}
+
+func NewSyncEventListener(cb func(event string, data any)) *syncEventListener {
+	return &syncEventListener{
+		id: uuid.NewString(),
+		cb: cb,
+	}
+}
+
+func NewSyncEmitter() *SyncEmitter {
+	return &SyncEmitter{
+		listeners: make(map[string][]syncEventListener),
+	}
+}
+
+func (e *SyncEmitter) Emit(event string, data any) {
+	e.Lock()
+	defer e.Unlock()
+	targets := e.listeners[event]
+
+	for _, listener := range targets {
+		listener.cb(event, data)
+	}
+}
+
+func (e *SyncEmitter) AddListener(event string, listener syncEventListener) {
+	e.Lock()
+	defer e.Unlock()
+	e.listeners[event] = append(e.listeners[event], listener)
+}
+
+func (e *SyncEmitter) RemoveListener(event string, listener syncEventListener) {
+	e.Lock()
+	defer e.Unlock()
+	for i, l := range e.listeners[event] {
+		if l.id == listener.id {
+			e.listeners[event] = append(e.listeners[event][:i], e.listeners[event][i+1:]...)
+		}
+	}
+}
diff --git a/fs/file.go b/fs/file.go
new file mode 100644
index 0000000..e629749
--- /dev/null
+++ b/fs/file.go
@@ -0,0 +1,11 @@
+package fs
+
+import (
+	"errors"
+	"os"
+)
+
+func PathExists(path string) bool {
+	_, err := os.Stat(path)
+	return !errors.Is(err, os.ErrNotExist)
+}
diff --git a/fs/go.mod b/fs/go.mod
new file mode 100644
index 0000000..5d2068b
--- /dev/null
+++ b/fs/go.mod
@@ -0,0 +1,3 @@
+module gitea.codeblob.work/pk/gut/fs
+
+go 1.22.0