Difference between revisions of "Dwm"

Revision as of 15:38, 4 December 2012

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dwm is a dynamic window manager for X. It manages windows in tiled, stacked, and full-screen layouts, as well as many others with the help of optional patches. Layouts can be applied dynamically, optimizing the environment for the application in use and the task performed. dwm is extremely lightweight and fast, written in C and with a stated design goal of remaining under 2000 source lines of code. It provides multi-head support for xrandr and Xinerama.

Installing

These instructions will install dwm using makepkg along with the Arch Build System, or ABS for short. This will allow reconfiguring it at a later time without complications. If only interested in installing dwm for a test drive, simply install the binary package from the repositories instead:

# pacman -S dwm

You will probably also want to consider installing dmenu, a fast and lightweight dynamic menu for X:

# pacman -S dmenu

Requirements

Basic programming tools present in base-devel are needed in order to compile dwm and build a package for it, and the abs package is also a requisite for fetching the necessary build scripts:

# pacman -S base-devel abs

Download build scripts with ABS

Once the required packages are installed, use ABS to update and then copy the dwm build scripts from the ABS tree to a temporary directory. For example:

# abs community/dwm
$ cp -r /var/abs/community/dwm ~/dwm

Build and install package

Use cd to switch to the directory containing the build scripts (the example above used ~/dwm). Then run:

$ makepkg -i

This will compile dwm, build an Arch Linux package containing the resulting files, and install the package file all in one step. If problems are encountered, review the output for specific information.

Configuring

dwm, as mentioned before, is exclusively configured at compile-time via some of its source files, namely config.h and config.mk. While the initial configuration provides a good set of defaults, it is reasonable to expect eventual customization.

Method 1: ABS rebuild (recommended)

Modifying dwm is quite simple using this route.

Customizing config.h

Browse to the dwm source code directory saved during the installation process; ~/dwm in the example. The config.h found within this directory is where the general dwm preferences are stored. Most settings within the file should be self-explanatory. For detailed information on these settings, see the dwm website.

Once changes have been made, pipe the new md5sums into the PKGBUILD:

$ makepkg -g >> PKGBUILD

This will eliminate a checksum mismatch between the official config.h and the new revised copy.

Now, compile and reinstall:

$ makepkg -efi

Assuming the configuration changes were valid, this command will compile dwm, build and reinstall the resulting package. If problems were encountered, review the output for specific information.

Finally, restart dwm in order to apply the changes.

Notes

From now on, instead of updating the md5sums for every config.h revision, which are known to become frequent, one may erase the md5sums array and build dwm with the --skipinteg option:

$ makepkg -efi --skipinteg

And after adding a few lines to dwm's start-up script, it is possible to restart dwm without logging out or closing programs.

Method 2: Mercurial (advanced)

dwm is maintained upstream within a Mercurial version control system at suckless.org. Those already familiar with Mercurial may find it more convenient to maintain configurations and patches within this system. A detailed tutorial on this method is available at the dwm website.

Before building dwm from the Mercurial sources, be sure to alter config.mk accordingly, because failure to do so may result in X crashes. Here are the values that need changing:

Modify PREFIX:

PREFIX = /usr

The X11 include folder:

X11INC = /usr/include/X11

And the the X11 lib directory:

X11LIB = /usr/lib/X11

Starting dwm

To start dwm with startx or the SLIM login manager, simply append the following to ~/.xinitrc:

exec dwm

For GDM, add it to ~/.Xclients instead, and select "Run XClient Script" from the Sessions menu.

Starting a customized dwm from a display manager

The default /usr/share/xsessions/dwm.desktop does not allow for a customized start like can be done in .xinitrc. A solution to this problem is to make a start script, for example /usr/bin/dwm-personalized and make an alternative xsession .desktop file (/usr/share/xsessions/dwm-personalized.desktop).

Example of /usr/share/xsessions/dwm-personalized

[Desktop Entry]
Encoding=UTF-8
Name=Dwm-personalized
Comment=Dynamic window manager
Exec=dwm-personalized
Icon=dwm
Type=XSession

Example of /usr/bin/dwm-personalized

#!/bin/zsh

#Set swedish keyboard map
setxkbmap se

#Set chrome as default browser
if [ -n "$DISPLAY" ]; then
     BROWSER=google-chrome
fi

#Set status bar & start DWM
conky | while read -r; do xsetroot -name "$REPLY"; done &
exec dwm

Statusbar configuration

dwm uses the root window's name to display information in its statusbar, which can be changed with xsetroot -name.

Basic statusbar

This example prints the date in ISO 8601 format. Add it to files ~/.xinitrc or ~/.Xclients or see this page's discussion for more details about the GDM-3 case :

while true; do
   xsetroot -name "$( date +"%F %R" )"
   sleep 1m    # Update time every minute
done &
exec dwm

Here is an example intended for laptops that depends on the acpi package for showing battery information:

while true ; do
    xsetroot -name "$(acpi -b | awk 'sub(/,/,"") {print $3, $4}')"
    sleep 1m
done &
exec dwm

The script displays the amount of battery remaining besides its charging status by using the awk command to trim away the unneeded text from acpi, and tr to remove the commas.

An alternative to the above is to selectively show the battery status depending on the current charging state:

while true; do
	batt=$(LC_ALL=C acpi -b)

	case $batt in
	*Discharging*)
		batt="${batt#* * * }"
		batt="${batt%%, *} "
		;;
	*)
		batt=""
		;;
	esac

	xsetroot -name "$batt$(date +%R)"

	sleep 60
done &

exec dwm

Finally, make sure there is only one instance of dwm in ~/.xinitrc or ~/.Xclients, so combining everything together should resemble this:

~/.setbg
autocutsel &
termirssi &
urxvt &

while true; do
   xsetroot -name "$(date +"%F %R")"
   sleep 1m    # Update time every minute
done &
exec dwm

Here is another example that displays also the alsa volume and the battery state. The latter only when the system is off-line.

#set statusbar
while true
do
   if acpi -a | grep off-line > /dev/null; then
       xsetroot -name "Bat. $(awk 'sub(/,/,"") {print $3, $4}' <(acpi -b)) \
       | Vol. $(awk '/dB/ { gsub(/[\[\]]/,""); print $5}' <(amixer get Master)) \
       | $(date +"%a, %b %d %R")"
   else
       xsetroot -name "Vol. $(awk '/dB/ { gsub(/[\[\]]/,""); print $5}' <(amixer get Master)) \
       | $(date +"%a, %b %d %R")"
   fi
   sleep 1s   
done &

Conky statusbar

Conky can be printed to the statusbar with xsetroot -name:

conky | while read -r; do xsetroot -name "$REPLY"; done &
exec dwm

To do this, conky needs to be told to output text to the console only. The following is a sample conkyrc for a dual core CPU, displaying several stats:

out_to_console yes
out_to_x no
background no
update_interval 2
total_run_times 0
use_spacer none

TEXT
$mpd_smart :: ${cpu cpu1}% / ${cpu cpu2}%  ${loadavg 1} ${loadavg 2 3} :: ${acpitemp}c :: $memperc% ($mem) :: ${downspeed eth0}K/s ${upspeed eth0}K/s :: ${time %a %b %d %I:%M%P}

Basic usage

Using dmenu

Dmenu is a useful addon to dwm. Rather than a standard list-style menu, it acts as a sort of autocomplete to typing in the names of binaries. It is more advanced than many program launchers and integrates well within dwm.

To start it, press Template:Keypress + Template:Keypress (Template:Keypress should be the Template:Keypress key by default). This can, of course, be changed if you so desire. Then, simply type in the first few characters of the binary you wish to run until you see it along the top bar. Then, simply use your left and right arrow keys to navigate to it and press enter.

For more information, see dmenu.

Controlling windows

Moving a window to another tag

Moving a window from one tag to another is very simple. To do so, simply bring the window into focus by hovering over it with your cursor, then press Template:Keypress + Template:Keypress + Template:Keypress, where 'x' is the number of the tag to which you want to move the window. [Mod1] is, by default, the Template:Keypress key.

Closing a window

To cleanly close a window using dwm, simply press Template:Keypress + Template:Keypress + Template:Keypress.

Window layouts

By default, dwm will operate in tiled mode. This can be observed by new windows on the same tag growing smaller and smaller as new windows are opened. The windows will, together, take up the entire screen (except for the menu bar) at all times. There are, however, two other modes: floating and monocle. Floating mode should be familiar to users of non-tiling window managers; it allows users to rearrange windows as they please. Monocle mode will keep a single window visible at all times.

To switch to floating mode, simply press Template:Keypress + Template:Keypress. Template:Keypress is, by default, the Template:Keypress key. To check if you are in floating mode, you should see something like this next to the numbered tags in the top right corner of the screen: X>.

To switch to monocole mode, press Template:Keypress + Template:Keypress. To check if you are in monocle mode, you can see an M in square brackets (if no windows are open on that tag) or a number in square brackets (which corresponds with the number of windows open on that tag). Thus, a tag with no windows open would display this: [M], and a tag with 'n' windows open would display this: [n].

To return to tiled mode, press Template:Keypress + Template:Keypress. You will see a symbol which looks like this: []= .

Exiting dwm

To cleanly exit dwm, press Template:Keypress + Template:Keypress + Template:Keypress.

Source: dwm tutorial.

Extended usage

Patches & additional tiling modes

The official website has a number of patches that can add extra functionality to dwm. Users can easily customize dwm by applying the modifications they like. The Bottom Stack patch provides an additional tiling mode that splits the screen horizontally, as opposed to the default vertically oriented tiling mode. Similarly, bstack horizontal splits the tiles horizontally.

The gaplessgrid patch allows windows to be tiled like a grid.

Enable one layout per tag

The default behaviour of dwm is to apply the currently selected layout for all tags.To have different layouts for different tags use the pertag patch.

Fixing gaps around terminal windows

If there are empty gaps of desktop space outside terminal windows, it is likely due to the terminal's font size. Either adjust the size until finding the ideal scale that closes the gap, or toggle resizehints to False in config.h:

static Bool resizehints = False; /* False means respect size hints in tiled resizals */

This will cause dwm to ignore resize requests from all client windows, not just terminals. The downside to this workaround is that some terminals may suffer redraw anomalies, such as ghost lines and premature line wraps, among others.

Urxvt

Another choice for urxvt users is applying the hints patch and regressing to dwm's original behaviour:

static Bool resizehints = True;

Restart dwm without logging out or closing programs

For restarting dwm without logging out or closing applications, change or add a startup script so that it loads dwm in a while loop, like this:

while true; do
    # Log stderror to a file 
    dwm 2> ~/.dwm.log
    # No error logging
    #dwm >/dev/null 2>&1
done

dwm can now be restarted without destroying other X windows by pressing the usual Mod-Shift-Q combination.

It is a good idea to place the above startup script into a separate file, ~/bin/startdwm for instance, and execute it through ~/.xinitrc. From this point on, when desiring to actually end the X session simply execute killall startdwm, or bind it to a convenient key.

Make the right Alt key work as if it were Mod4 (Windows Key)

When using Mod4 (aka Super/Windows Key) as the MODKEY, it may be equally convenient to have the right Alt key (Alt_R) act as Mod4. This will allow performing otherwise awkward keystrokes one-handed, such as zooming with Alt_R+Enter.

First, find out which keycode is assigned to Alt_R:

xmodmap -pke | grep Alt_R

Then simply add the following to the startup script (e.g. ~/.xinitrc), changing the keycode 113 if necessary to the result gathered by the previous xmodmap command:

xmodmap -e "keycode 113 = Super_L"  # reassign Alt_R to Super_L
xmodmap -e "remove mod1 = Super_L"  # make sure X keeps it out of the mod1 group

Now, any functions that are triggered by a Super_L (Windows) key press will also be triggered by an Alt_R key press.

Disable focus follows mouse behaviour

To disable focus follows mouse behaviour comment out the following line in definiton of struct handler in dwm.c

[EnterNotify] = enternotify, 

Note that this change can cause some difficulties. After it the first click on inactive window will only bring the focus on it. To interact with window contents (buttons, fields etc) you need to click again. Also if you have several monitors you can notice that keyboard focus doesn't switch to another monitor activated by clicking.

Adding custom keybinds/shortcuts

Two entries are needed in config.h to create custom keybinds. One under the "/* commands /*" section, and another under the "static Key keys[] = {" section.

static const char *<keybindname>[]   = { "<command>", "<flags>", "<arguments>", NULL };

<keybindname> can be anything... <command> <-flags> and <arguments> can be anything but they have to be individually enclosed in "",

{ MODKEY,            XK_<key>,      spawn,          {.v = <keybindname> } },

...would bind Mod+<key> to the command defined previously.

{ MODKEY|ShiftMask,  XK_<key>,      spawn,          {.v = <keybindname> } },

...would bind Mod+Shift+<key> Use ControlMask for Ctrl key.

Single keys such as Fn or multimedia keys have to be bound with the hex codes obtainable from the program "xev"

{ 0,                 0xff00,    spawn,       {.v = <keybindname> } },

...would bind foo key 0xff00 to <keybindname>

Fixing misbehaving Java applications

As of JRE 6u20, Java applications misbehave in dwm because it is not a known window manager to Java. This causes menus to close when the mouse is released, and other little issues. First, install wmname from the [community] repository:

# pacman -S wmname

Now all you have to do is use wmname to set a WM name that Java recognizes:

$ wmname LG3D

This is not permanent, so you may want to add this command to your .xinitrc.

It is also possible to change enable export _JAVA_AWT_WM_NONREPARENTING=1 in /etc/profile.d/jre.sh

See also

• dwm's official website
• Introduction to dwm video
• dmenu - Simple application launcher from the developers of dwm
• The dwm thread on the forums
• Hacking dwm thread
• Check out the forums' wallpaper thread for a selection of dwm wallpapers
• Show off your dwm configuration forum thread
• Moved to dwm