added a general comment to dwm.h how dwm is basically organized
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dwm.h
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dwm.h
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/*
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* (C)opyright MMVI Anselm R. Garbe <garbeam at gmail dot com>
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* See LICENSE file for license details.
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*
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* dynamic window manager is designed like any other X client as well. It is
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* driven through handling X events. In contrast to other X clients, a window
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* manager like dwm selects for SubstructureRedirectMask on the root window, to
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* receive events about child window appearance and disappearance. Only one X
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* connection at a time is allowed to select for this event mask by any X
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* server, thus only one window manager instance can be executed at a time.
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* Any attempt to select for SubstructureRedirectMask by any connection after
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* another connection already selected for those events, will result in an
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* error generated by the server. Such errors are reported through calling the
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* current X error handler.
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*
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* Calls to pop an X event from the event queue of the X connection are
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* blocking. Due the fact, that dwm reads status text from standard input, a
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* select-driven main loop has been implemented which selects for reads on the
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* X connection and STDIN_FILENO to handle all data smoothly and without
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* busy-loop quirks.. The event handlers of dwm are organized in an array
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* which is accessed whenever a new event has been popped. This allows event
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* dispatching in O(1) time.
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*
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* Each child window of the root window is called a client in window manager
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* terminology, except windows which have set the override_redirect flag.
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* Clients are organized in a global doubly-linked client list, the focus
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* history is remembered through a global stack list. Each client contains an
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* array of Bools of the same size as the global tags array to indicate the
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* tags of a client. There are no other data structures to organize the clients
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* in tag lists, because a single global list is most simple. All clients which
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* have at least one tag enabled of the current tags viewed, will be visible on
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* the screen, all other clients are banned to the x-location 2 * screen width.
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* This avoids having additional layers of workspace handling.
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*
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* For each client dwm creates a small title window which is resized whenever
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* the WM_NAME or _NET_WM_NAME properties are updated.
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*
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* Keys and tagging rules are organized as arrays as well and defined in the
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* config.h file. These arrays are kept static in event.o and tag.o
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* respectively, because no other part of dwm needs access to them.
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*
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* The current mode is represented by the arrange function pointer which wether
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* points to dofloat or dotile.
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*/
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#include "config.h"
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