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-README for the Vim source code
-
-Here are a few hints for finding your way around the source code.  This
-doesn't make it less complex than it is, but it gets you started.
-
-You might also want to read ":help development".
-
-
-JUMPING AROUND
-
-First of all, use ":make tags" to generate a tags file, so that you can jump
-around in the source code.
-
-To jump to a function or variable definition, move the cursor on the name and
-use the CTRL-] command.  Use CTRL-T or CTRL-O to jump back.
-
-To jump to a file, move the cursor on its name and use the "gf" command.
-
-Most code can be found in a file with an obvious name (incomplete list):
-	autocmd.c	autocommands
-	buffer.c	manipulating buffers (loaded files)
-	diff.c		diff mode (vimdiff)
-	eval.c		expression evaluation
-	fileio.c	reading and writing files
-	findfile.c	search for files in 'path'
-	fold.c		folding
-	getchar.c	getting characters and key mapping
-	indent.c	C and Lisp indentation
-	mark.c		marks
-	mbyte.c		multi-byte character handling
-	memfile.c	storing lines for buffers in a swapfile
-	memline.c	storing lines for buffers in memory
-	menu.c		menus
-	message.c	(error) messages
-	ops.c		handling operators ("d", "y", "p")
-	option.c	options
-	quickfix.c	quickfix commands (":make", ":cn")
-	regexp.c	pattern matching
-	screen.c	updating the windows
-	search.c	pattern searching
-	sign.c		signs
-	spell.c		spell checking
-	syntax.c	syntax and other highlighting
-	tag.c		tags
-	term.c		terminal handling, termcap codes
-	undo.c		undo and redo
-	window.c	handling split windows
-
-
-DEBUGGING
-
-If you have a reasonable recent version of gdb, you can use the :Termdebug
-command to debug Vim.  See  ":help :Termdebug".
-
-When something is time critical or stepping through code is a hassle, use the
-channel logging to create a time-stamped log file.  Add lines to the code like
-this:
-	ch_log(NULL, "Value is now %02x", value);
-After compiling and starting Vim, do:
-	:call ch_logfile('debuglog', 'w')
-And edit "debuglog" to see what happens.  The channel functions already have
-ch_log() calls, thus you always see that in the log.
-
-
-IMPORTANT VARIABLES
-
-The current mode is stored in "State".  The values it can have are NORMAL,
-INSERT, CMDLINE, and a few others.
-
-The current window is "curwin".  The current buffer is "curbuf".  These point
-to structures with the cursor position in the window, option values, the file
-name, etc.  These are defined in structs.h.
-
-All the global variables are declared in globals.h.
-
-
-THE MAIN LOOP
-
-This is conveniently called main_loop().  It updates a few things and then
-calls normal_cmd() to process a command.  This returns when the command is
-finished.
-
-The basic idea is that Vim waits for the user to type a character and
-processes it until another character is needed.  Thus there are several places
-where Vim waits for a character to be typed.  The vgetc() function is used for
-this.  It also handles mapping.
-
-Updating the screen is mostly postponed until a command or a sequence of
-commands has finished.  The work is done by update_screen(), which calls
-win_update() for every window, which calls win_line() for every line.
-See the start of screen.c for more explanations.
-
-
-COMMAND-LINE MODE
-
-When typing a ":", normal_cmd() will call getcmdline() to obtain a line with
-an Ex command.  getcmdline() contains a loop that will handle each typed
-character.  It returns when hitting <CR> or <Esc> or some other character that
-ends the command line mode.
-
-
-EX COMMANDS
-
-Ex commands are handled by the function do_cmdline().  It does the generic
-parsing of the ":" command line and calls do_one_cmd() for each separate
-command.  It also takes care of while loops.
-
-do_one_cmd() parses the range and generic arguments and puts them in the
-exarg_t and passes it to the function that handles the command.
-
-The ":" commands are listed in ex_cmds.h.  The third entry of each item is the
-name of the function that handles the command.  The last entry are the flags
-that are used for the command.
-
-
-NORMAL MODE COMMANDS
-
-The Normal mode commands are handled by the normal_cmd() function.  It also
-handles the optional count and an extra character for some commands.  These
-are passed in a cmdarg_t to the function that handles the command.
-
-There is a table nv_cmds in normal.c which lists the first character of every
-command.  The second entry of each item is the name of the function that
-handles the command.
-
-
-INSERT MODE COMMANDS
-
-When doing an "i" or "a" command, normal_cmd() will call the edit() function.
-It contains a loop that waits for the next character and handles it.  It
-returns when leaving Insert mode.
-
-
-OPTIONS
-
-There is a list with all option names in option.c, called options[].
-
-
-THE GUI
-
-Most of the GUI code is implemented like it was a clever terminal.  Typing a
-character, moving a scrollbar, clicking the mouse, etc. are all translated
-into events which are written in the input buffer.  These are read by the
-main code, just like reading from a terminal.  The code for this is scattered
-through gui.c.  For example: gui_send_mouse_event() for a mouse click and
-gui_menu_cb() for a menu action.  Key hits are handled by the system-specific
-GUI code, which calls add_to_input_buf() to send the key code.
-
-Updating the GUI window is done by writing codes in the output buffer, just
-like writing to a terminal.  When the buffer gets full or is flushed,
-gui_write() will parse the codes and draw the appropriate items.  Finally the
-system-specific GUI code will be called to do the work.
-
-
-DEBUGGING THE GUI
-
-Remember to prevent that gvim forks and the debugger thinks Vim has exited,
-add the "-f" argument.  In gdb: "run -f -g".
-
-When stepping through display updating code, the focus event is triggered
-when going from the debugger to Vim and back.  To avoid this, recompile with
-some code in gui_focus_change() disabled.