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/vim.h

@@ -0,0 +1,158 @@
+#ifndef NEOVIM_API_VIM_H
+#define NEOVIM_API_VIM_H
+
+#include <stdint.h>
+#include <stdbool.h>
+
+#include "api/defs.h"
+
+/// Send keys to vim input buffer, simulating user input.
+///
+/// @param str The keys to send
+void vim_push_keys(String str);
+
+/// 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);
+
+/// Evaluates the expression str using the vim internal expression
+/// evaluator (see |expression|).
+/// Dictionaries and lists are recursively expanded.
+///
+/// @param str The expression str
+/// @param[out] err Details of an error that may have occurred
+/// @return The expanded object
+Object vim_eval(String str, Error *err);
+
+/// Calculates the number of display cells `str` occupies, tab is counted as
+/// one cell.
+///
+/// @param str Some text
+/// @return The number of cells
+int64_t vim_strwidth(String str);
+
+/// Returns a list of paths contained in 'runtimepath'
+///
+/// @return The list of paths
+StringArray vim_list_runtime_paths(void);
+
+/// Changes vim working directory
+///
+/// @param dir The new working directory
+/// @param[out] err Details of an error that may have occurred
+void vim_change_directory(String dir, Error *err);
+
+/// Return the current line
+///
+/// @param[out] err Details of an error that may have occurred
+/// @return The current line string
+String vim_get_current_line(Error *err);
+
+/// Delete the current line
+///
+/// @param[out] err Details of an error that may have occurred
+void vim_del_current_line(Error *err);
+
+/// Sets the current line
+///
+/// @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);
+
+/// Gets a global variable
+///
+/// @param name The variable name
+/// @param[out] err Details of an error that may have occurred
+/// @return The variable value
+Object vim_get_var(String name, Error *err);
+
+/// Sets a global variable. Passing 'nil' as value deletes the variable.
+///
+/// @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 if any
+Object vim_set_var(String name, Object value, Error *err);
+
+/// Gets a vim variable
+///
+/// @param name The variable name
+/// @param[out] err Details of an error that may have occurred
+/// @return The variable value
+Object vim_get_vvar(String name, Error *err);
+
+/// Get an option value string
+///
+/// @param name The option name
+/// @param[out] err Details of an error that may have occurred
+/// @return The option value
+Object vim_get_option(String name, Error *err);
+
+/// Sets an option value
+///
+/// @param name The option name
+/// @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);
+
+/// Write a message to vim output buffer
+///
+/// @param str The message
+void vim_out_write(String str);
+
+/// Write a message to vim error buffer
+///
+/// @param str The message
+void vim_err_write(String str);
+
+/// Gets the number of buffers
+///
+/// @return The number of buffers
+int64_t vim_get_buffer_count(void);
+
+/// Return the current buffer
+///
+/// @reqturn The buffer handle
+Buffer vim_get_current_buffer(void);
+
+/// Sets the current buffer
+///
+/// @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);
+
+/// Gets the number of windows
+///
+/// @return The number of windows
+int64_t vim_get_window_count(void);
+
+/// Return the current window
+///
+/// @return The window handle
+Window vim_get_current_window(void);
+
+/// Sets the current window
+///
+/// @param handle The window handle
+void vim_set_current_window(Window window, Error *err);
+
+/// Gets the number of tab pages
+///
+/// @return The number of tab pages
+int64_t vim_get_tabpage_count(void);
+
+/// Return the current tab page
+///
+/// @return The tab page handle
+Tabpage vim_get_current_tabpage(void);
+
+/// Sets the current tab page
+///
+/// @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);
+
+#endif  // NEOVIM_API_VIM_H
+