1 files changed, 120 insertions, 0 deletions
diff --git a/src/nvim/channel.h b/src/nvim/channel.h
new file mode 100644
index 0000000000..b48f508722
--- /dev/null
+++ b/src/nvim/channel.h
@@ -0,0 +1,120 @@
+#ifndef NVIM_CHANNEL_H
+#define NVIM_CHANNEL_H
+
+#include "nvim/main.h"
+#include "nvim/event/socket.h"
+#include "nvim/event/process.h"
+#include "nvim/os/pty_process.h"
+#include "nvim/event/libuv_process.h"
+#include "nvim/eval/typval.h"
+#include "nvim/msgpack_rpc/channel_defs.h"
+
+typedef enum {
+  kChannelStreamProc,
+  kChannelStreamSocket,
+  kChannelStreamStdio,
+  kChannelStreamInternal
+} ChannelStreamType;
+
+typedef struct {
+  Stream in;
+  Stream out;
+} StdioPair;
+
+// typedef struct {
+//   Callback on_out;
+//   Callback on_close;
+//   Garray buffer;
+//   bool buffering;
+// } CallbackReader
+
+#define CallbackReader Callback
+
+struct Channel {
+  uint64_t id;
+  size_t refcount;
+  MultiQueue *events;
+
+  ChannelStreamType streamtype;
+  union {
+    Process proc;
+    LibuvProcess uv;
+    PtyProcess pty;
+    Stream socket;
+    StdioPair stdio;
+  } stream;
+
+  bool is_rpc;
+  RpcState rpc;
+  Terminal *term;
+
+  CallbackReader on_stdout;
+  CallbackReader on_stderr;
+  Callback on_exit;
+
+  varnumber_T *status_ptr; // TODO: refactor?
+};
+
+EXTERN PMap(uint64_t) *channels;
+
+#ifdef INCLUDE_GENERATED_DECLARATIONS
+# include "channel.h.generated.h"
+#endif
+
+static inline Channel *channel_alloc(ChannelStreamType type)
+{
+  Channel *chan = xcalloc(1, sizeof(*chan));
+  chan->id = next_chan_id++;
+  chan->events = multiqueue_new_child(main_loop.events);
+  chan->refcount = 1;
+  chan->streamtype = type;
+  pmap_put(uint64_t)(channels, chan->id, chan);
+  return chan;
+}
+
+/// @returns Channel with the id or NULL if not found
+static inline Channel *find_channel(uint64_t id)
+{
+  return pmap_get(uint64_t)(channels, id);
+}
+
+static inline Stream *channel_instream(Channel *chan)
+  FUNC_ATTR_NONNULL_ALL
+{
+  switch (chan->streamtype) {
+    case kChannelStreamProc:
+      return &chan->stream.proc.in;
+
+    case kChannelStreamSocket:
+      return &chan->stream.socket;
+
+    case kChannelStreamStdio:
+      return &chan->stream.stdio.in;
+
+    case kChannelStreamInternal:
+      abort();
+  }
+  abort();
+}
+
+static inline Stream *channel_outstream(Channel *chan)
+  FUNC_ATTR_NONNULL_ALL
+{
+  switch (chan->streamtype) {
+    case kChannelStreamProc:
+      return &chan->stream.proc.out;
+
+    case kChannelStreamSocket:
+      return &chan->stream.socket;
+
+    case kChannelStreamStdio:
+      return &chan->stream.stdio.out;
+
+    case kChannelStreamInternal:
+      abort();
+  }
+  abort();
+}
+
+
+#endif  // NVIM_CHANNEL_H