backporting my intro-comment of old dwm.h
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dwm.c
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dwm.c
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/* See LICENSE file for copyright and license details. */
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/* See LICENSE file for copyright and 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 selects for SubstructureRedirectMask on the root window, to receive
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* events about window (dis-)appearance. Only one X connection at a time is
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* allowed to select for this event mask.
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*
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* Calls to fetch an X event from the event queue are blocking. Due reading
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* status text from standard input, a select()-driven main loop has been
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* implemented which selects for reads on the X connection and STDIN_FILENO to
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* handle all data smoothly. The event handlers of dwm are organized in an
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* array which is accessed whenever a new event has been fetched. This allows
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* event dispatching in O(1) time.
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*
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* Each child of the root window is called a client, except windows which have
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* set the override_redirect flag. Clients are organized in a global
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* doubly-linked client list, the focus history is remembered through a global
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* stack list. Each client contains an array of Bools of the same size as the
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* global tags array to indicate the tags of a client. For each client dwm
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* creates a small title window, which is resized whenever the (_NET_)WM_NAME
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* properties are updated or the client is moved/resized.
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*
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* Keys and tagging rules are organized as arrays and defined in the config.h
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* file. These arrays are kept static in event.o and tag.o respectively,
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* because no other part of dwm needs access to them. The current layout is
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* represented by the lt pointer.
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*
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* To understand everything else, start reading main().
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*/
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#include <errno.h>
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#include <locale.h>
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#include <regex.h>
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