*: Rename main loop variable from loop to main_loop

Current name is inappropriate for the following reasons:

1. It is often masked by local `loop` variables.
2. It cannot be searched for. There are many `loop` variables where `loop` is
   some local variable. There are many cases when “loop” word is used in
   a comment.
3. It is in any case bad idea to use a generic name as a name of the global
   variable. Best if global has module prefix: this is why it is in `main.h`:
   `main_loop` both stands for “a main loop” and “a loop defined in `main.*`”.

Since I have no idea how to list every occurrence of this variable method used
to rename it is “remove it from globals.h, try to compile, fix errors”. Thus if
some occurrence was hidden under false `#if` branch it was not replaced.

2 files changed, 5 insertions, 3 deletions

diff --git a/src/nvim/tui/input.c b/src/nvim/tui/input.c
index 99eb230a88..f374c6dc7a 100644
--- a/src/nvim/tui/input.c
+++ b/src/nvim/tui/input.c
@@ -4,6 +4,7 @@
 #include "nvim/api/vim.h"
 #include "nvim/api/private/helpers.h"
 #include "nvim/ascii.h"
+#include "nvim/main.h"
 #include "nvim/misc2.h"
 #include "nvim/os/os.h"
 #include "nvim/os/input.h"
@@ -92,7 +93,7 @@ static void flush_input(TermInput *input, bool wait_until_empty)
   size_t drain_boundary = wait_until_empty ? 0 : 0xff;
   do {
     uv_mutex_lock(&input->key_buffer_mutex);
-    loop_schedule(&loop, event_create(1, wait_input_enqueue, 1, input));
+    loop_schedule(&main_loop, event_create(1, wait_input_enqueue, 1, input));
     input->waiting = true;
     while (input->waiting) {
       uv_cond_wait(&input->key_buffer_cond, &input->key_buffer_mutex);
@@ -336,7 +337,7 @@ static void read_cb(Stream *stream, RBuffer *buf, size_t c, void *data,
       stream_close(&input->read_stream, NULL);
       queue_put(input->loop->fast_events, restart_reading, 1, input);
     } else {
-      loop_schedule(&loop, event_create(1, input_done_event, 0));
+      loop_schedule(&main_loop, event_create(1, input_done_event, 0));
     }
     return;
   }
diff --git a/src/nvim/tui/tui.c b/src/nvim/tui/tui.c
index 62bc81ba64..4732b816c5 100644
--- a/src/nvim/tui/tui.c
+++ b/src/nvim/tui/tui.c
@@ -11,6 +11,7 @@
 #include "nvim/vim.h"
 #include "nvim/ui.h"
 #include "nvim/map.h"
+#include "nvim/main.h"
 #include "nvim/memory.h"
 #include "nvim/api/vim.h"
 #include "nvim/api/private/helpers.h"
@@ -261,7 +262,7 @@ static void sigwinch_cb(SignalWatcher *watcher, int signum, void *data)
   UI *ui = data;
   update_size(ui);
   // run refresh_event in nvim main loop
-  loop_schedule(&loop, event_create(1, refresh_event, 0));
+  loop_schedule(&main_loop, event_create(1, refresh_event, 0));
 }
 
 static bool attrs_differ(HlAttrs a1, HlAttrs a2)