refactor(io): separate types for read and write streams

This is a structural refactor with no logical changes, yet. Done in
preparation for simplifying rstream/rbuffer which will require more
state inline in RStream.

The initial idea was to have RStream and WStream as sub-types
symetrically but that doesn't work, as sockets are both reading and
writing. Also there is very little write-specific state to start with,
so the benefit of a separate WStream struct is a lot smaller. Just
document what fields in `Stream` are write specific.

2 files changed, 3 insertions, 3 deletions

diff --git a/src/nvim/tui/input.c b/src/nvim/tui/input.c
index f1594dfcb9..588fed2d90 100644
--- a/src/nvim/tui/input.c
+++ b/src/nvim/tui/input.c
@@ -167,7 +167,7 @@ void tinput_destroy(TermInput *input)
   map_destroy(int, &kitty_key_map);
   rbuffer_free(input->key_buffer);
   uv_close((uv_handle_t *)&input->timer_handle, NULL);
-  stream_close(&input->read_stream, NULL, NULL);
+  rstream_may_close(&input->read_stream);
   termkey_destroy(input->tk);
 }
 
@@ -737,7 +737,7 @@ static void handle_raw_buffer(TermInput *input, bool force)
   }
 }
 
-static void tinput_read_cb(Stream *stream, RBuffer *buf, size_t count_, void *data, bool eof)
+static void tinput_read_cb(RStream *stream, RBuffer *buf, size_t count_, void *data, bool eof)
 {
   TermInput *input = data;
 
diff --git a/src/nvim/tui/input.h b/src/nvim/tui/input.h
index bf6d0f2978..646fbdd16a 100644
--- a/src/nvim/tui/input.h
+++ b/src/nvim/tui/input.h
@@ -33,7 +33,7 @@ typedef struct {
   TermKey_Terminfo_Getstr_Hook *tk_ti_hook_fn;  ///< libtermkey terminfo hook
   uv_timer_t timer_handle;
   Loop *loop;
-  Stream read_stream;
+  RStream read_stream;
   RBuffer *key_buffer;
   TUIData *tui_data;
 } TermInput;