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.TH "waybar\-niri\-window" "5" "2026\-08\-31"
.PP
.SH NAME
.PP
waybar \- niri window module
.PP
.SH DESCRIPTION
.PP
The \fBwindow\fR module displays the title of the currently focused window in niri.\&
.PP
.SH CONFIGURATION
.PP
Addressed by \fBniri/window\fR
.PP
\fBformat\fR: 
.br
typeof: string 
.br
default: {title} 
.br
The format, how information should be displayed.\& On {} the current window title is displayed.\&
.PP
\fBrewrite\fR: 
.br
typeof: object 
.br
Rules to rewrite window title.\& See \fBrewrite rules\fR.\&
.PP
\fBseparate\-outputs\fR: 
.br
typeof: bool 
.br
Show the active window of the monitor the bar belongs to, instead of the focused window.\&
.PP
\fBicon\fR: 
.br
typeof: bool 
.br
default: false 
.br
Option to hide the application icon.\&
.PP
\fBicon\-size\fR: 
.br
typeof: integer 
.br
default: 24 
.br
Option to change the size of the application icon.\&
.PP
\fBexpand\fR: 
.br
typeof: bool 
.br
default: false 
.br
Enables this module to consume all left over space dynamically.\&
.PP
.SH FORMAT REPLACEMENTS
.PP
See the output of "niri msg windows" for examples
.PP
\fB{title}\fR: The current title of the focused window.\&
.PP
\fB{app_id}\fR: The current app ID of the focused window.\&
.PP
.SH REWRITE RULES
.PP
\fBrewrite\fR is an object where keys are regular expressions and values are
rewrite rules if the expression matches.\& Rules may contain references to
captures of the expression.\&
.PP
Regular expression and replacement follow ECMA\-script rules.\&
.PP
If no expression matches, the title is left unchanged.\&
.PP
Invalid expressions (e.\&g.\&, mismatched parentheses) are skipped.\&
.PP
.SH EXAMPLES
.PP
.nf
.RS 4
"niri/window": {
	"format": "{}",
	"rewrite": {
		"(\&.*) \- Mozilla Firefox": "🌎 $1",
		"(\&.*) \- zsh": "> [$1]"
	}
}
.fi
.RE
.PP
.SH STYLE
.PP
.PD 0
.IP \(bu 4
\fB#window\fR
.IP \(bu 4
\fBwindow#waybar.\&empty #window\fR When no windows are on the workspace
.PD
.PP
The following classes are applied to the entire Waybar rather than just the
window widget:
.PP
.PD 0
.IP \(bu 4
\fBwindow#waybar.\&empty\fR When no windows are in the workspace
.IP \(bu 4
\fBwindow#waybar.\&solo\fR When only one window is on the workspace
.IP \(bu 4
\fBwindow#waybar.\&<app\-id>\fR Where \fBapp\-id\fR is the app ID of the only window on
the workspace