Read notification from STDIN

February 6, 2025 · View on GitHub

Discalimer: Currently no active development going on.

[[https://github.com/phuhl/linux_notification_center/workflows/CI/badge.svg?branch=master]]

Linux Notification Center

A haskell-written notification center for users that like a desktop with style...

Take part in the discussion on our [[https://github.com/phuhl/linux_notification_center/discussions][discussion board]]!

#+BEGIN_EXAMPLE

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                                    ╒══════╕
                                NEW │ 2023 │ Update:
                                    ╘══════╛


                      For all users of the non-git packages:
                              ¨¨¨¨¨        ¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨

   Customize all CSS might [probably will] brake your current styling settings.
         (more information on this in the file updateyourconfig2021.org)


                                 New config style
                                 ┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈

              █▀▄ █▀▄ █▀█ █ █ ▀█▀ █▀█ █▀▀   █▀▀ █ █ █▀█ █▀█ █▀▀ █▀▀
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        The configuration file is now in YAML format. It's also massively
                   cleaned up thanks to the input of MyriaCore!

                        The new configuration allows for:

                              Extended Scriptability
                              ┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈

         Now any notification can be modified by an external script. This
        allows for all the logic you could possibly do on a notification.

                 Define special styles for special notifications!


                                 Many more fixes
                                 ┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈

                           Additional Features from 2021
                           ┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈

                         New deadd.css configuration file
                           Style all elements yourself

                          Reload CSS styling on the fly

                Use CSS transitions when loading a new colortheme
                           and smoothly change the mood



                   As always, many thanks to our contributors:


    (¯`·.¸¸.·´                                                     `·.¸¸.·´¯)
   ( \                                                                     / )
   ( \ )          MyriaCore S-NA ahmubashshir mgil2 resolritter          ( / )
  ( ) (           woutervb avdv TaylanTatli rbowden91 kianmeng            ) ( )
   ( / )          opalmay balsoft trk9001 CobaltSpace lierdakil          ( \ )
   ( /                                                                     \ )
    (_.·´¯`·.¸                                                    ¸.·´¯`·.¸_)


                               Thank you very much!


        Finally, thank you to everyone who created issues, commented, and
                         helped to further this project.

                                                                                     ▝
                                                                                     ▝

▖ ▐ ▖ ▐ ▌ Further news in releasenotes.org ▐ ▙▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▟

#+END_EXAMPLE

** Features

The notification center receives notifications via DBUS (like any notification daemon) and shows them in the upper right corner of the screen. The notification (if not specified in the notification otherwise) will also be shown in the notification center even after the notification disappeared by itself. The notifications can be clicked to make them disappear.

Notifications can be replaced by the use of the =replaces-id= feature of the notification specification.

The notification center can (optionally) show user-specified buttons in the bottom that can be in two states (highlighted/not highlighted) and that can run customizable shell commands.

** Screenshots

Some applications, notification: [[file:README.org.img/org_20200223_193450_1en7sh.jpg]]

Notification Center opened: [[file:README.org.img/org_20200223_193345_VhlbOf.jpg]]

Link, Markup, Progressbar, and Action support: [[file:README.org.img/org_20201220_000601_9V037T.jpg]]

** Usage

To start it: #+BEGIN_SRC sh

deadd-notification-center #+END_SRC

Toggle between hidden and shown state of the notification center: #+BEGIN_SRC sh kill -s USR1 $(pidof deadd-notification-center) #+END_SRC

Set the state of a user defined button (in this example the first button, which has =id= 0): #+BEGIN_SRC sh

turn highlighting on

notify-send.py a --hint boolean:deadd-notification-center:true
int:id:0 boolean:state:true type:string:buttons

turn highlighting off

notify-send.py a --hint boolean:deadd-notification-center:true
int:id:0 boolean:state:false type:string:buttons #+END_SRC This snippet uses [[https://github.com/phuhl/notify-send.py][notify-send.py]], an improved version of libnotify (notify-send).

Clear all notifications #+BEGIN_SRC sh

within the notification center

notify-send.py a --hint boolean:deadd-notification-center:true
string:type:clearInCenter

popups

notify-send.py a --hint boolean:deadd-notification-center:true
string:type:clearPopups #+END_SRC

Pause/Unpause popup notifications #+BEGIN_SRC sh

notify-send.py a --hint boolean:deadd-notification-center:true
string:type:pausePopups

notify-send.py a --hint boolean:deadd-notification-center:true
string:type:unpausePopups #+END_SRC

Reload CSS Styling file #+BEGIN_SRC sh notify-send.py a --hint boolean:deadd-notification-center:true
string:type:reloadStyle #+END_SRC

Send notifications that only show up in the notification center but do not produce a popup: #+BEGIN_SRC sh notify-send.py "Does not pop up" -t 1 #+END_SRC

*** Supported hints and features

Action buttons with gtk icons #+BEGIN_SRC sh notify-send.py "And buttons" "Do you like buttons?"
--hint boolean:action-icons:true
--action yes:face-cool no:face-sick
#+END_SRC

Notification images by gtk icon #+BEGIN_SRC sh notify-send.py "Icons are" "COOL"
--hint string:image-path:face-cool #+END_SRC

Notification images by file #+BEGIN_SRC sh notify-send.py "Images are" "COOL"
--hint string:image-path:file://path/to/image/from/root.png #+END_SRC

Notification with progress bar #+BEGIN_SRC sh notify-send.py "This notification has a progressbar" "33%"
--hint int:has-percentage:33) #or notify-send.py "This notification has a progressbar" "33%"
--hint int:value:33) #+END_SRC

Notification with slider #+BEGIN_SRC sh notify-send.py "This notification has a slider" "33%"
--hint int:has-percentage:33 --action changeValue:abc) #+END_SRC

*** Example: Brightness indicator

This snippet can be used to produce a brightness-indicator. It requires the [[https://github.com/phuhl/notify-send.py][notify-send.py]] script.

#+BEGIN_SRC sh #!/bin/bash

if [ "$1" == "inc" ]; then xbacklight -inc 5 fi

if [ "$1" == "dec" ]; then xbacklight -lower 5 fi

BRIGHTNESS= $(xbacklight -get) NOTI_ID=$ (notify-send.py "Bildschirmhelligkeit" " $BRIGHTNESS/100" \ --hint string:image-path:video-display boolean:transient:true \ int:has-percentage:$ BRIGHTNESS
--replaces-process "brightness-popup") #+END_SRC

*** Example: Volume indicator

This snippet can be used to produce a volume-indicator. It requires the [[https://github.com/phuhl/notify-send.py][notify-send.py]] script.

#+BEGIN_SRC sh #!/bin/bash

if [ "$1" == "inc" ]; then amixer -q sset Master 5%+ fi

if [ "$1" == "dec" ]; then amixer -q sset Master 5%- fi

if [ "$1" == "mute" ]; then amixer -q sset Master toggle fi

AMIXER= $(amixer sget Master) VOLUME=$ (echo $AMIXER | grep 'Right:' | awk -F'[][]' '{ print \$ 2 }' | tr -d "%") MUTE= $(echo$ AMIXER | grep -o '[off]' | tail -n 1) if [ " $VOLUME" -le 20 ]; then ICON=audio-volume-low else if [ "$ VOLUME" -le 60 ]; then ICON=audio-volume-medium else ICON=audio-volume-high fi fi if [ "$MUTE" == "[off]" ]; then ICON=audio-volume-muted fi

NOTI_ID= $(notify-send.py "Lautstärke" "$ VOLUME/100"
--hint string:image-path: $ICON boolean:transient:true \ int:has-percentage:$ VOLUME
--replaces-process "volume-popup") #+END_SRC

** Install

Install from the AUR for Arch: [[https://aur.archlinux.org/packages/deadd-notification-center/][deadd-notification-center]].

If you want to spare yourself the hassle of the build time there is a binary package available: [[https://aur.archlinux.org/packages/deadd-notification-center-bin/][deadd-notification-center-bin]].

If you don't want to wait for me to publish the next stable release: Use the new AUR git-package.

[[https://aur.archlinux.org/packages/deadd-notification-center-git/][deadd-notification-center-git]].

On Ubuntu, Debian, everything... Replace 1.7.2 with the current-most release from the [[https://github.com/phuhl/linux_notification_center/releases][release section]].

Manually install the dependencies (exact names might differ in your distribution):

gtk3
gobject-introspection-runtime

#+BEGIN_SRC sh tar -xvzf linux_notification_center-1.7.2.tar.gz cd linux_notification_center-1.7.2 wget https://github.com/phuhl/linux_notification_center/releases/download/1.7.2/deadd-notification-center mkdir -p .out mv deadd-notification-center .out sudo make install #+END_SRC

Dependencies:

[[https://www.archlinux.org/packages/community/x86_64/stack/][stack]]
cairo
pango
gobject-introspection
gtk3

#+BEGIN_SRC shell-script make sudo make install #+END_SRC

** Configuration

NOTE: Some styling config has moved. More infos in this file: [[https://github.com/phuhl/linux_notification_center/blob/master/updateyourconfig2021.org][updateyourconfig2021.org]]

No configuration is necessary, the notification center comes with sensible defaults™.

All colors and sizes are customizable, as well as the default timeout for notifications and the optional buttons in the notification center. Below are possible configurable options shown. The configuration file must be located at =~/.config/deadd/deadd.yml= (or, if configured differently on your system: =${XDG_CONFIG_HOME}/deadd/deadd.yml=).

Additionally, a =deadd.css= will be loaded from the same folder. It contains the styling of the notification center. You can load changes from the =deadd.css= file by using the command described in the section "Usage".

#+BEGIN_SRC yaml

Margins for notification-center/notifications

margin-top: 0 margin-right: 0

Margins for notification-center

margin-bottom: 0

Width of the notification center/notifications in pixels.

width: 500

Command to run at startup. This can be used to setup

button states.

startup-command: deadd-notification-center-startup

Monitor on which the notification center/notifications will be

printed. If "follow-mouse" is set true, this does nothing.

monitor: 0

If true, the notification center/notifications will open on the

screen, on which the mouse is. Overrides the "monitor" setting.

follow-mouse: false

notification-center: ### Margin at the top/right/bottom of the notification center in ### pixels. This can be used to avoid overlap between the notification ### center and bars such as polybar or i3blocks. # margin-top: 0 # margin-right: 0 # margin-bottom: 0

### Width of the notification center in pixels.
# width: 500

### Monitor on which the notification center will be printed. If
### "follow-mouse" is set true, this does nothing.
# monitor: 0

### If true, the notification center will open on the screen, on which
### the mouse is. Overrides the "monitor" setting.
# follow-mouse: false

### Notification center closes when the mouse leaves it
hide-on-mouse-leave: true

### If newFirst is set to true, newest notifications appear on the top
### of the notification center. Else, notifications stack, from top to
### bottom.
new-first: true

### If true, the transient field in notifications will be ignored,
### thus the notification will be persisted in the notification
### center anyways
ignore-transient: false

### Custom buttons in notification center
buttons:
  ### Numbers of buttons that can be drawn on a row of the notification
  ### center.
  # buttons-per-row: 5

  ### Height of buttons in the notification center (in pixels).    
  # buttons-height: 60

  ### Horizontal and vertical margin between each button in the 
  ### notification center (in pixels).
  # buttons-margin: 2

  ### Button actions and labels. For each button you must specify a
  ### label and a command.
  actions:
    # - label: VPN
    #   command: "sudo vpnToggle"
    # - label: Bluetooth
    #   command: bluetoothToggle
    # - label: Wifi
    #   command: wifiToggle
    # - label: Screensaver
    #   command: screensaverToggle
    # - label: Keyboard
    #   command: keyboardToggle

notification: ### If true, markup (, , , ) will be displayed properly use-markup: true

### If true, html entities (& for &, % for %, etc) will be ### parsed properly. This is useful for chromium-based apps, which ### tend to send these in notifications. parse-html-entities: true dbus: ### If noti-closed messages are enabled, the sending application ### will know that a notification was closed/timed out. This can ### be an issue for certain applications, that overwrite ### notifications on status updates (e.g. Spotify on each ### song). When one of these applications thinks, the notification ### has been closed/timed out, they will not overwrite existing ### notifications but send new ones. This can lead to redundant ### notifications in the notification center, as the close-message ### is send regardless of the notification being persisted. send-noti-closed: false app-icon: ### If set to true: If no icon is passed by the app_icon parameter ### and no application "desktop-entry"-hint is present, deadd will ### try to guess the icon from the application name (if present). guess-icon-from-name: true ### The display size of the application icons in the notification ### pop-ups and in the notification center icon-size: 20 image: ### The maximal display size of images that are part of ### notifications for notification pop-ups and in the notification ### center size: 100 ### The margin around the top, bottom, left, and right of ### notification images. margin-top: 15 margin-bottom: 15 margin-left: 15 margin-right: 0 ### Apply modifications to certain notifications: ### Each modification rule needs a "match" and either a "modify" or ### a "script" entry. modifications: ### Match: ### Matches the notifications against these rules. If all of the ### values (of one modification rule) match, the "modify"/"script" ### part is applied. # - match: ### Possible match criteria: # title: "Notification title" # body: "Notification body" # time: "12:44" # app-name: "App name" # urgency: "low" # "low", "normal" or "critical" # modify: ### Possible modifications # title: "abc" # body: "abc" # app-name: "abc" # app-icon: "file:///abc.png" ### The timeout has three special values: ### timeout: 0 -> don't time out at all ### timeout: -1 -> use default timeout ### timeout: 1 -> don't show as pop-up ### timeout: >1 -> milliseconds until timeout # timeout: 1 # margin-right: 10 # margin-top: 10 # image: "file:///abc.png" # image-size: 10 # transient: true # send-noti-closed: false ### Remove action buttons from notifications # remove-actions: true ### Set the action-icons hint to true, action labels will then ### be intergreted as GTK icon names # action-icons: true ### List of actions, where the even elements (0, 2, ...) are the ### action name and the odd elements are the label # actions: # - previous # - media-skip-backward # - play # - media-playback-start # - next # - media-skip-forward ### Action commands, where the keys (e.g. "play") is the action ### name and the value is a program call that should be executed ### on action. Prevents sending of the action to the application. # action-commands: # play: playerctl play-pause # previous: playerctl previous # next: playerctl next ### Add a class-name to the notification container, that can be ### used for specific styling of notifications using the ### deadd.css file # class-name: "abc" # - match: # app-name: "Chromium" ### Instead of modifying a notification directly, a script can be ### run, which will receive the notification as JSON on STDIN. It ### is expected to return JSON/YAML configuration that defines the ### modifications that should be applied. Minimum complete return ### value must be '{"modify": {}, "match": {}}'. Always leave the "match" ### object empty (technical reasons, i.e. I am lazy). # script: "linux-notification-center-parse-chromium" - match: app-name: "Spotify" modify: image-size: 80 timeout: 1 send-noti-closed: true class-name: "Spotify" action-icons: true actions: - previous - media-skip-backward - play - media-playback-start - next - media-skip-forward action-commands: play: playerctl play-pause previous: playerctl previous next: playerctl next # - match: # title: Bildschirmhelligkeit # modify: # image-size: 60 popup: ### Default timeout used for notifications in milli-seconds. This can ### be overwritten with the "-t" option (or "--expire-time") of the ### notify-send command. default-timeout: 10000 ### Margin above/right/between notifications (in pixels). This can ### be used to avoid overlap between notifications and a bar such as ### polybar or i3blocks. margin-top: 50 margin-right: 50 margin-between: 20 ### Defines after how many lines of text the body will be truncated. ### Use 0 if you want to disable truncation. max-lines-in-body: 3 ### Determines whether the GTK widget that displays the notification body ### in the notification popup will be hidden when empty. This is especially ### useful for transient notifications that display a progress bar. # hide-body-if-empty: false ### Monitor on which the notifications will be ### printed. If "follow-mouse" is set true, this does nothing. # monitor: 0 ### If true, the notifications will open on the ### screen, on which the mouse is. Overrides the "monitor" setting. # follow-mouse: false click-behavior: ### The mouse button for dismissing a popup. Must be either "mouse1", ### "mouse2", "mouse3", "mouse4", or "mouse5" dismiss: mouse1 ### The mouse button for opening a popup with the default action. ### Must be either "mouse1", "mouse2", "mouse3", "mouse4", or "mouse5" default-action: mouse3

#+END_SRC

*** CSS styling

The default CSS style can be found in =/etc/xdg/deadd/deadd.css=. It is advised to copy this file to =${XDG_CONFIG_HOME}/deadd/deadd.css= (usually =.config/deadd/deadd.css=) if you want to make changes.

In the file you can change CSS styles (GTK3-flavor). Should the installation not have created a =dead.css=, you can use the content of [[https://github.com/phuhl/linux_notification_center/blob/master/style.css][style.css]] as a foundation.

The following class-names for labels are defined:

Notifications:

=label.deadd-noti-center.notification.appname= :: Appname

=label.deadd-noti-center.notification.body= :: Textbody

=label.deadd-noti-center.notification.title= :: Notification title

=image.deadd-noti-center.notification.image= :: Image of a notification

=image.deadd-noti-center.notification.icon= :: Appicon

=button.deadd-noti-center.notification.actionbutton= :: Action buttons

Notifications in the notification center:

=label.deadd-noti-center.in-center.appname= :: Appname

=label.deadd-noti-center.in-center.body= :: Textbody

=label.deadd-noti-center.in-center.title= :: Notification title

=label.deadd-noti-center.in-center.time= :: Notification time

=image.deadd-noti-center.in-center.image= :: Image of a notification

=image.deadd-noti-center.in-center.icon= :: Appicon

=button.deadd-noti-center.in-center.button-close= :: Close button on notification

=button.deadd-noti-center.in-center.actionbutton= :: Action buttons

Notification-center:

=label.deadd-noti-center.noti-center.time= :: The big time at the top

=label.deadd-noti-center.noti-center.date= :: The date text

=label.deadd-noti-center.noti-center.delete-all= :: "Delete all" Button

=button.deadd-noti-center.noti-center.userbutton= :: User buttons

Additionally, you can specify custom class-names in the modifications-section of your =deadd.yml=. These class names will be defined on the notification container (all notification elements lie within) of pop-ups and in-center.

**** Examples:

Remove appname and icon from notifications

#+BEGIN_SRC css image.deadd-noti-center.notification.icon, label.deadd-noti-center.notification.appname, image.deadd-noti-center.in-center.icon, label.deadd-noti-center.in-center.appname { opacity: 0 } #+END_SRC

Change font

#+BEGIN_SRC css .deadd-noti-center { font-family: monospace; } #+END_SRC

Specify special background for one app

[[file:README.org.img/org_20210119_120536_adyKnd.jpg]]

#+BEGIN_SRC css .notificationInCenter.Spotify { background: linear-gradient(130deg, rgba(0, 0, 0, 0.1), rgba(0, 255, 0, 0.3)); border-radius: 5px; } #+END_SRC

This change requires a modification in your deadd.yml:

#+BEGIN_SRC yaml notification: modifications:

match: app-name: "Spotify" modify: class-name: "Spotify" #+END_SRC

*** Notification-based scripting

You can modify notifications if they match certain criteria.

Matching:

The criteria you can specify are equality for the following parameters:

title

body

app-name

time

The matching parameters can be specified in the section =notification.modifications.match= of your =deadd.yml=.

Modifying:

You can set the following parameters:

=title=

=body=

=app-name=

=timeout= (specified in milliseconds)

=margin-right= (overrides ~~distanceRight~~ from the configuration)

=margin-top= (overrides ~~distanceTop~~ from the configuration)

=icon= (overrides the app-icon, value must be either empty, a path to an image or a gtk-icon-name)

=image= (overrides the image of the notification, value must be either empty, a path to an image or a gtk-icon-name)

=image-size=

=transient= (value has to be =true= or =false=)

=send-noti-closed= (value has to be =true= or =false=, if set to true it will prevent that a DBUS =NotificationClosed= message will be send for this notification. Only applies if the configuration parameter =configSendNotiClosedDbusMessage= is set to =true=)

=class-name= (adds a CSS-class name to the container of the notification for styling)

=remove-actions= (value can be anything, if used, no action buttons will be displayed on the notifications)

=action-icons= (=true= or =false=, if set to =true= the action label will be interpreted as an gtk-icon-name and an icon is displayed)

=actions= (array where every even element is the action name, every odd element is the action label. Actions are rendered as buttons in a notification. As the action most likely won't be known by the notification sender, you probably want to use this with the =action-commands= modification)

=action-commands= (object where the keys are the action name and the value is a program call that should be executed when the action button has been clicked. Prevents sending of the action to the application.)

The modification parameters can be specified in the section =notification.modifications.modify= of your =deadd.yml=.

Running Scripts:

Instead of modifying a notification directly, a script can be run, which will receive the notification as JSON on STDIN. The script is expected to return JSON/YAML configuration that defines the modifications that should be applied. Minimum complete return value must be ={"modify": {}, "match": {}}=. Always leave the "match" object empty (technical reasons, i.e. I am lazy).

Example script to turn a notification from WhatsApp in Chromium into something sensible:

Before:

[[file:README.org.img/org_20210119_122628_AUuEu3.jpg]]

After:

[[file:README.org.img/org_20210119_122031_BNYKTp.jpg]]

Configuration:

#+BEGIN_SRC yaml notification: modifications:

match: app-name: "Chromium" script: "linux-notification-center-parse-chromium"

#+END_SRC

Script executed on Chromium notifications:

#+BEGIN_SRC sh #!/bin/bash

Read notification from STDIN

noti="" while read line do noti= ${noti}$ {line} done < "${1:-/dev/stdin}"

Use jq to parse JSON and get the body field of the notification

body= $(echo$ noti | jq '.body') if [[ " $body" == "\"<a href=\\\"https://web.whatsapp.com/\\\">web.whatsapp.com</a>"* ]]; then # It's Whatsapp web, lets modify the notification isWhatsapp=1 body=$ (echo $body | cut -c 64-) img=$ (echo $noti | jq '.image') if [[ "$ img" == ""NamedIcon \""* ]]; then filepath= $(echo$ img | cut -c 14- | head -c -4) cp $filepath /tmp/whatsappimg.png fi fi

if [[ " $isWhatsapp" == "1" ]]; then # Returning the modifications to dnc as JSON echo "{\"modify\": {\"app-icon\": \"whatsapp-desktop\", \"app-name\": \"WhatsApp\", \"image-size\": 50, \"image\": \"file:///tmp/whatsappimg.png\", \"remove-actions\": true, \"class-name\": \"WhatsApp\", \"body\":\"$ {body}}, "match": {}}" else echo '{"modify": {}, "match": {}}' fi #+END_SRC

** Contribute

First of all: Contribution is obviously 100% optional.

If you want to join the development chat, join our matrix channel: #deadd-notification-center:beeper.com or drop by on the discussion board: https://github.com/phuhl/linux_notification_center/discussions

If you do not want to contribute with your time, you can buy me a beer. Someone mentioned, they would be willing to donate, so here is my PayPal link: [[https://paypal.me/phuhl]]. Should you consider to donate, please be aware that this does not buy you the right to demand anything. This is a hobby and will be. But if you just want to give me some motivation by showing me that you appreciate my work, feel free to do so :)

** See also

Also take a look at my [[https://github.com/phuhl/notify-send.py][notify-send.py]] which imitates notify-send (libnotify) but also is able to replace notifications.