Add onSetActive callback (#2885)

Co-authored-by: taconi <igor.tacoi@protonmail.com>

internal/action/tab.go

@@ -1,9 +1,12 @@
 package action
 
 import (
+	luar "layeh.com/gopher-luar"
+
 	"github.com/zyedidia/micro/v2/internal/buffer"
 	"github.com/zyedidia/micro/v2/internal/config"
 	"github.com/zyedidia/micro/v2/internal/display"
+	ulua "github.com/zyedidia/micro/v2/internal/lua"
 	"github.com/zyedidia/micro/v2/internal/screen"
 	"github.com/zyedidia/micro/v2/internal/views"
 	"github.com/zyedidia/tcell/v2"
@@ -276,6 +279,11 @@ func (t *Tab) SetActive(i int) {
 			p.SetActive(false)
 		}
 	}
+
+	err := config.RunPluginFn("onSetActive", luar.New(ulua.L, MainTab().CurPane()))
+	if err != nil {
+		screen.TermMessage(err)
+	}
 }
 
 // GetPane returns the pane with the given split index

runtime/help/plugins.md

@@ -50,6 +50,8 @@ which micro defines:
 
 * `postinit()`: initialization function called after `init()`.
 
+* `onSetActive(bufpane)`: runs when changing the currently active panel.
+
 * `onBufferOpen(buf)`: runs when a buffer is opened. The input contains
    the buffer object.