1 files changed, 134 insertions, 0 deletions
diff --git a/src/nvim/channel.h b/src/nvim/channel.h
new file mode 100644
index 0000000000..b856d197f1
--- /dev/null
+++ b/src/nvim/channel.h
@@ -0,0 +1,134 @@
+#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"
+
+#define CHAN_STDIO 1
+#define CHAN_STDERR 2
+
+typedef enum {
+  kChannelStreamProc,
+  kChannelStreamSocket,
+  kChannelStreamStdio,
+  kChannelStreamStderr,
+  kChannelStreamInternal
+} ChannelStreamType;
+
+typedef enum {
+  kChannelPartStdin,
+  kChannelPartStdout,
+  kChannelPartStderr,
+  kChannelPartRpc,
+  kChannelPartAll
+} ChannelPart;
+
+
+typedef struct {
+  Stream in;
+  Stream out;
+} StdioPair;
+
+typedef struct {
+  bool closed;
+} StderrState;
+
+typedef struct {
+  Callback cb;
+  dict_T *self;
+  garray_T buffer;
+  bool buffered;
+} CallbackReader;
+
+#define CALLBACK_READER_INIT ((CallbackReader){ .cb = CALLBACK_NONE, \
+                                                .self = NULL, \
+                                                .buffer = GA_EMPTY_INIT_VALUE, \
+                                                .buffered = false })
+static inline bool callback_reader_set(CallbackReader reader)
+{
+  return reader.cb.type != kCallbackNone || reader.self;
+}
+
+struct Channel {
+  uint64_t id;
+  size_t refcount;
+  MultiQueue *events;
+
+  ChannelStreamType streamtype;
+  union {
+    Process proc;
+    LibuvProcess uv;
+    PtyProcess pty;
+    Stream socket;
+    StdioPair stdio;
+    StderrState err;
+  } stream;
+
+  bool is_rpc;
+  RpcState rpc;
+  Terminal *term;
+
+  CallbackReader on_stdout;
+  CallbackReader on_stderr;
+  Callback on_exit;
+};
+
+EXTERN PMap(uint64_t) *channels;
+
+#ifdef INCLUDE_GENERATED_DECLARATIONS
+# include "channel.h.generated.h"
+#endif
+
+/// @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.out;
+
+    case kChannelStreamInternal:
+    case kChannelStreamStderr:
+      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.in;
+
+    case kChannelStreamInternal:
+    case kChannelStreamStderr:
+      abort();
+  }
+  abort();
+}
+
+
+#endif  // NVIM_CHANNEL_H