vis-lua: expose file open event to lua

The event is only triggerred for new files read from disk (e.g.
splitting an existing window will not cause an event to be emitted).

2 files changed, 8 insertions, 0 deletions

diff --git a/README.md b/README.md
index c88f5f7..284b80b 100644
--- a/README.md
+++ b/README.md
@@ -585,6 +585,7 @@ At this time there exists no API stability guarantees.
    - `events` hooks
      - `start()`
      - `quit()`
+     - `file_open(file)`
      - `win_open(win)`
      - `win_close(win)`
      - `theme_change(name)`
diff --git a/vis-lua.c b/vis-lua.c
index 56949fe..91ce414 100644
--- a/vis-lua.c
+++ b/vis-lua.c
@@ -1503,6 +1503,13 @@ void vis_lua_quit(Vis *vis) {
 
 void vis_lua_file_open(Vis *vis, File *file) {
 	debug("event: file-open: %s %p %p\n", file->name ? file->name : "unnamed", (void*)file, (void*)file->text);
+	lua_State *L = vis->lua;
+	vis_lua_event_get(L, "file_open");
+	if (lua_isfunction(L, -1)) {
+		obj_ref_new(L, file, "vis.file");
+		pcall(vis, L, 1, 0);
+	}
+	lua_pop(L, 1);
 }
 
 void vis_lua_file_save(Vis *vis, File *file) {