api: Add FUNC_ATTR_DEFERRED attribute to a number of functions

Any function that can directly mutate the screen or execute vimscript had the
attribute applied.

src/nvim/api/buffer.c

@@ -69,6 +69,7 @@ String buffer_get_line(Buffer buffer, Integer index, Error *err)
 /// @param line The new line.
 /// @param[out] err Details of an error that may have occurred
 void buffer_set_line(Buffer buffer, Integer index, String line, Error *err)
+  FUNC_ATTR_DEFERRED
 {
   Object l = STRING_OBJ(line);
   Array array = {.items = &l, .size = 1};
@@ -81,6 +82,7 @@ void buffer_set_line(Buffer buffer, Integer index, String line, Error *err)
 /// @param index The line index
 /// @param[out] err Details of an error that may have occurred
 void buffer_del_line(Buffer buffer, Integer index, Error *err)
+  FUNC_ATTR_DEFERRED
 {
   Array array = ARRAY_DICT_INIT;
   buffer_set_line_slice(buffer, index, index, true, true, array, err);
@@ -163,6 +165,7 @@ void buffer_set_line_slice(Buffer buffer,
                       Boolean include_end,
                       ArrayOf(String) replacement,
                       Error *err)
+  FUNC_ATTR_DEFERRED
 {
   buf_T *buf = find_buffer_by_handle(buffer, err);
 
@@ -314,6 +317,7 @@ Object buffer_get_var(Buffer buffer, String name, Error *err)
 /// @param[out] err Details of an error that may have occurred
 /// @return The old value
 Object buffer_set_var(Buffer buffer, String name, Object value, Error *err)
+  FUNC_ATTR_DEFERRED
 {
   buf_T *buf = find_buffer_by_handle(buffer, err);
 
@@ -349,6 +353,7 @@ Object buffer_get_option(Buffer buffer, String name, Error *err)
 /// @param value The option value
 /// @param[out] err Details of an error that may have occurred
 void buffer_set_option(Buffer buffer, String name, Object value, Error *err)
+  FUNC_ATTR_DEFERRED
 {
   buf_T *buf = find_buffer_by_handle(buffer, err);
 
@@ -399,6 +404,7 @@ String buffer_get_name(Buffer buffer, Error *err)
 /// @param name The buffer name
 /// @param[out] err Details of an error that may have occurred
 void buffer_set_name(Buffer buffer, String name, Error *err)
+  FUNC_ATTR_DEFERRED
 {
   buf_T *buf = find_buffer_by_handle(buffer, err);
 
@@ -444,6 +450,7 @@ void buffer_insert(Buffer buffer,
                    Integer lnum,
                    ArrayOf(String) lines,
                    Error *err)
+  FUNC_ATTR_DEFERRED
 {
   buffer_set_line_slice(buffer, lnum, lnum, false, true, lines, err);
 }

src/nvim/api/tabpage.c

@@ -62,6 +62,7 @@ Object tabpage_get_var(Tabpage tabpage, String name, Error *err)
 /// @param[out] err Details of an error that may have occurred
 /// @return The tab page handle
 Object tabpage_set_var(Tabpage tabpage, String name, Object value, Error *err)
+  FUNC_ATTR_DEFERRED
 {
   tabpage_T *tab = find_tab_by_handle(tabpage, err);
 

src/nvim/api/vim.c

@@ -31,19 +31,12 @@
 # include "api/vim.c.generated.h"
 #endif
 
-/// Send keys to vim input buffer, simulating user input.
-///
-/// @param str The keys to send
-void vim_push_keys(String str)
-{
-  abort();
-}
-
 /// Executes an ex-mode command str
 ///
 /// @param str The command str
 /// @param[out] err Details of an error that may have occurred
 void vim_command(String str, Error *err)
+  FUNC_ATTR_DEFERRED
 {
   // Run the command
   try_start();
@@ -111,6 +104,7 @@ String vim_replace_termcodes(String str, Boolean from_part, Boolean do_lt,
 /// @param[out] err Details of an error that may have occurred
 /// @return The expanded object
 Object vim_eval(String str, Error *err)
+  FUNC_ATTR_DEFERRED
 {
   Object rv;
   // Evaluate the expression
@@ -230,6 +224,7 @@ String vim_get_current_line(Error *err)
 /// @param line The line contents
 /// @param[out] err Details of an error that may have occurred
 void vim_set_current_line(String line, Error *err)
+  FUNC_ATTR_DEFERRED
 {
   buffer_set_line(curbuf->handle, curwin->w_cursor.lnum - 1, line, err);
 }
@@ -238,6 +233,7 @@ void vim_set_current_line(String line, Error *err)
 ///
 /// @param[out] err Details of an error that may have occurred
 void vim_del_current_line(Error *err)
+  FUNC_ATTR_DEFERRED
 {
   buffer_del_line(curbuf->handle, curwin->w_cursor.lnum - 1, err);
 }
@@ -259,6 +255,7 @@ Object vim_get_var(String name, Error *err)
 /// @param[out] err Details of an error that may have occurred
 /// @return the old value if any
 Object vim_set_var(String name, Object value, Error *err)
+  FUNC_ATTR_DEFERRED
 {
   return dict_set_value(&globvardict, name, value, err);
 }
@@ -289,6 +286,7 @@ Object vim_get_option(String name, Error *err)
 /// @param value The new option value
 /// @param[out] err Details of an error that may have occurred
 void vim_set_option(String name, Object value, Error *err)
+  FUNC_ATTR_DEFERRED
 {
   set_option_to(NULL, SREQ_GLOBAL, name, value, err);
 }
@@ -297,6 +295,7 @@ void vim_set_option(String name, Object value, Error *err)
 ///
 /// @param str The message
 void vim_out_write(String str)
+  FUNC_ATTR_DEFERRED
 {
   write_msg(str, false);
 }
@@ -305,6 +304,7 @@ void vim_out_write(String str)
 ///
 /// @param str The message
 void vim_err_write(String str)
+  FUNC_ATTR_DEFERRED
 {
   write_msg(str, true);
 }
@@ -314,6 +314,7 @@ void vim_err_write(String str)
 ///
 /// @param str The message
 void vim_report_error(String str)
+  FUNC_ATTR_DEFERRED
 {
   vim_err_write(str);
   vim_err_write((String) {.data = "\n", .size = 1});
@@ -357,6 +358,7 @@ Buffer vim_get_current_buffer(void)
 /// @param id The buffer handle
 /// @param[out] err Details of an error that may have occurred
 void vim_set_current_buffer(Buffer buffer, Error *err)
+  FUNC_ATTR_DEFERRED
 {
   buf_T *buf = find_buffer_by_handle(buffer, err);
 
@@ -407,6 +409,7 @@ Window vim_get_current_window(void)
 ///
 /// @param handle The window handle
 void vim_set_current_window(Window window, Error *err)
+  FUNC_ATTR_DEFERRED
 {
   win_T *win = find_window_by_handle(window, err);
 
@@ -462,6 +465,7 @@ Tabpage vim_get_current_tabpage(void)
 /// @param handle The tab page handle
 /// @param[out] err Details of an error that may have occurred
 void vim_set_current_tabpage(Tabpage tabpage, Error *err)
+  FUNC_ATTR_DEFERRED
 {
   tabpage_T *tp = find_tab_by_handle(tabpage, err);
 

src/nvim/api/window.c

@@ -52,6 +52,7 @@ ArrayOf(Integer, 2) window_get_cursor(Window window, Error *err)
 /// @param pos the (row, col) tuple representing the new position
 /// @param[out] err Details of an error that may have occurred
 void window_set_cursor(Window window, ArrayOf(Integer, 2) pos, Error *err)
+  FUNC_ATTR_DEFERRED
 {
   win_T *win = find_window_by_handle(window, err);
 
@@ -111,6 +112,7 @@ Integer window_get_height(Window window, Error *err)
 /// @param height the new height in rows
 /// @param[out] err Details of an error that may have occurred
 void window_set_height(Window window, Integer height, Error *err)
+  FUNC_ATTR_DEFERRED
 {
   win_T *win = find_window_by_handle(window, err);
 
@@ -154,6 +156,7 @@ Integer window_get_width(Window window, Error *err)
 /// @param width the new width in columns
 /// @param[out] err Details of an error that may have occurred
 void window_set_width(Window window, Integer width, Error *err)
+  FUNC_ATTR_DEFERRED
 {
   win_T *win = find_window_by_handle(window, err);
 
@@ -199,6 +202,7 @@ Object window_get_var(Window window, String name, Error *err)
 /// @param[out] err Details of an error that may have occurred
 /// @return The old value
 Object window_set_var(Window window, String name, Object value, Error *err)
+  FUNC_ATTR_DEFERRED
 {
   win_T *win = find_window_by_handle(window, err);
 
@@ -234,6 +238,7 @@ Object window_get_option(Window window, String name, Error *err)
 /// @param value The option value
 /// @param[out] err Details of an error that may have occurred
 void window_set_option(Window window, String name, Object value, Error *err)
+  FUNC_ATTR_DEFERRED
 {
   win_T *win = find_window_by_handle(window, err);