event: Remove EventType enum and pass a callback to `event_push`

This approach is more flexible because we don't need to support a fixed set of
"event types", any module can push events to be handled in main loop by simply
passing a callback to the Event structure.

5 files changed, 9 insertions, 25 deletions

diff --git a/src/nvim/os/event.c b/src/nvim/os/event.c
index f20d43c6a4..43c02b13b2 100644
--- a/src/nvim/os/event.c
+++ b/src/nvim/os/event.c
@@ -170,19 +170,7 @@ static size_t process_from(klist_t(Event) *queue)
   Event event;
 
   while (kl_shift(Event, queue, &event) == 0) {
-    switch (event.type) {
-      case kEventSignal:
-        signal_handle(event);
-        break;
-      case kEventRStreamData:
-        rstream_read_event(event);
-        break;
-      case kEventJobExit:
-        job_exit_event(event);
-        break;
-      default:
-        abort();
-    }
+    event.handler(event);
     count++;
   }
 
diff --git a/src/nvim/os/event_defs.h b/src/nvim/os/event_defs.h
index dbee3e2ba7..553d4e3125 100644
--- a/src/nvim/os/event_defs.h
+++ b/src/nvim/os/event_defs.h
@@ -7,16 +7,12 @@
 #include "nvim/os/rstream_defs.h"
 
 typedef void * EventSource;
+typedef struct event Event;
+typedef void (*event_handler)(Event event);
 
-typedef enum {
-  kEventSignal,
-  kEventRStreamData,
-  kEventJobExit
-} EventType;
-
-typedef struct {
+struct event {
   EventSource source;
-  EventType type;
+  event_handler handler;
   union {
     int signum;
     struct {
@@ -25,6 +21,6 @@ typedef struct {
     } rstream;
     Job *job;
   } data;
-} Event;
+}; 
 
 #endif  // NVIM_OS_EVENT_DEFS_H
diff --git a/src/nvim/os/job.c b/src/nvim/os/job.c
index 2ca1023290..d0ac82c047 100644
--- a/src/nvim/os/job.c
+++ b/src/nvim/os/job.c
@@ -489,7 +489,7 @@ static void emit_exit_event(Job *job)
 {
   Event event = {
     .source = job_event_source(job),
-    .type = kEventJobExit,
+    .handler = job_exit_event,
     .data.job = job
   };
   event_push(event);
diff --git a/src/nvim/os/rstream.c b/src/nvim/os/rstream.c
index 8f1c30de50..b95098cc52 100644
--- a/src/nvim/os/rstream.c
+++ b/src/nvim/os/rstream.c
@@ -430,7 +430,7 @@ static void emit_read_event(RStream *rstream, bool eof)
 {
   Event event = {
     .source = rstream_event_source(rstream),
-    .type = kEventRStreamData,
+    .handler = rstream_read_event,
     .data.rstream = {
       .ptr = rstream,
       .eof = eof
diff --git a/src/nvim/os/signal.c b/src/nvim/os/signal.c
index 2f93cfb08a..b330c7f788 100644
--- a/src/nvim/os/signal.c
+++ b/src/nvim/os/signal.c
@@ -164,7 +164,7 @@ static void signal_cb(uv_signal_t *handle, int signum)
 
   Event event = {
     .source = signal_event_source(),
-    .type = kEventSignal,
+    .handler = signal_handle,
     .data = {
       .signum = signum
     }