Introduce nvim namespace: Move files.

Move files from src/ to src/nvim/.
- src/nvim/ becomes the new root dir for nvim executable sources.
- src/libnvim/ is planned to become root dir of the neovim library.

src/nvim/api/window.h

@@ -0,0 +1,115 @@
+#ifndef NEOVIM_API_WINDOW_H
+#define NEOVIM_API_WINDOW_H
+
+#include <stdint.h>
+#include <stdbool.h>
+
+#include "api/defs.h"
+
+/// Gets the current buffer in a window
+///
+/// @param window The window handle
+/// @param[out] err Details of an error that may have occurred
+/// @return The buffer handle
+Buffer window_get_buffer(Window window, Error *err);
+
+/// Gets the cursor position in the window
+///
+/// @param window The window handle
+/// @param[out] err Details of an error that may have occurred
+/// @return the (row, col) tuple
+Position window_get_cursor(Window window, Error *err);
+
+/// Sets the cursor position in the window
+///
+/// @param window The window handle
+/// @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, Position pos, Error *err);
+
+/// Gets the window height
+///
+/// @param window The window handle
+/// @param[out] err Details of an error that may have occurred
+/// @return the height in rows
+int64_t window_get_height(Window window, Error *err);
+
+/// Sets the window height. This will only succeed if the screen is split
+/// horizontally.
+///
+/// @param window The window handle
+/// @param height the new height in rows
+/// @param[out] err Details of an error that may have occurred
+void window_set_height(Window window, int64_t height, Error *err);
+
+/// Gets the window width
+///
+/// @param window The window handle
+/// @param[out] err Details of an error that may have occurred
+/// @return the width in columns
+int64_t window_get_width(Window window, Error *err);
+
+/// Sets the window width. This will only succeed if the screen is split
+/// vertically.
+///
+/// @param window The window handle
+/// @param width the new width in columns
+/// @param[out] err Details of an error that may have occurred
+void window_set_width(Window window, int64_t width, Error *err);
+
+/// Gets a window variable
+///
+/// @param window The window handle
+/// @param name The variable name
+/// @param[out] err Details of an error that may have occurred
+/// @return The variable value
+Object window_get_var(Window window, String name, Error *err);
+
+/// Sets a window variable. Passing 'nil' as value deletes the variable.
+///
+/// @param window The window handle
+/// @param name The variable name
+/// @param value The variable value
+/// @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);
+
+/// Gets a window option value
+///
+/// @param window The window handle
+/// @param name The option name
+/// @param[out] err Details of an error that may have occurred
+/// @return The option value
+Object window_get_option(Window window, String name, Error *err);
+
+/// Sets a window option value. Passing 'nil' as value deletes the option(only
+/// works if there's a global fallback)
+///
+/// @param window The window handle
+/// @param name The option name
+/// @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);
+
+/// Gets the window position in display cells. First position is zero.
+///
+/// @param window The window handle
+/// @param[out] err Details of an error that may have occurred
+/// @return The (row, col) tuple with the window position
+Position window_get_position(Window window, Error *err);
+
+/// Gets the window tab page
+///
+/// @param window The window handle
+/// @param[out] err Details of an error that may have occurred
+/// @return The tab page that contains the window
+Tabpage window_get_tabpage(Window window, Error *err);
+
+/// Checks if a window is valid
+///
+/// @param window The window handle
+/// @return true if the window is valid, false otherwise
+bool window_is_valid(Window window);
+
+#endif  // NEOVIM_API_WINDOW_H
+