98 lines
3.2 KiB
Groff
98 lines
3.2 KiB
Groff
.TH RIVERGUILE 1 2023-11-25 "git.sr.ht/~leon_plickat/riverguile" "General Commands Manual"
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.SH NAME
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.P
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riverguile \- scheme powered layout generator for river
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.
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.SH SYNOPSIS
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.SY riverguile
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.YS
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.
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.SH DESCRIPTION
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.P
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Layout generator for the
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.BR river (1)
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Wayland server which allows users to define layouts using guile scheme functions.
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.
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.P
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The layout namespace is \fBriverguile\fB.
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.
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.P
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Uppon launch, riverguile tries to eval a scheme script and checks the following
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paths for it in the given order:
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.IP \(bu 2
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\fBlayout.scm\fR
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.IP \(bu 2
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\fB$XDG_CONFIG_HOME/river/layout.scm\fR
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.IP \(bu 2
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\fB$HOME/.config/river/layout.scm\fR
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.IP \(bu 2
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\fB/etc/riverguile/layout.scm\fR
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.
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.P
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In the context of this script, a special procedure
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\fB(install-handler \fR\fIkey\fR \fIproc\fR\fB)\fR is available, which can be
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used to install handlers to certain events.
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The parameter \fIkey\fR is a symbol indicating for which event to install
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the procedure \fIproc\fR.
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.P
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The key \fBlayout-demand\fR installs a handler for layout demands, which must
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accept five required arguments, which are, in order: The amount of views in the
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layout (integer), the available width (integer), the available height (integer),
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the currently active tag set (integer representing a bitfield of size 32)
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and the global name of the output the layout is needed for (integer).
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The procedure must return a list containing exactly as many lists as there are
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views in the layout.
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Each of those sublists must contains exactly four numerical values, which are
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the x and y coordinates of the window as well as its width and height.
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Window positions and dimensions get applied to rivers window list top to bottom.
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Note that the numerical values do not need to be exact, riverguile takes care
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of rounding and casting for you.
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.P
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The key \fBuser-command\fR install a handler for user commands, which are the
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strings a user can send to layout generators.
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This handler procedure must accept three arguments, which are, in order:
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The command (string), the currently active tags (integer representing a
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bitfield of size 32) and the global name of the output (integer).
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This event can be used to change paramters of the layout.
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A new layout demand will be send right after this event.
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.
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.
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.SH EXAMPLE
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.P
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This is an example configuration, which installs a layout that simply assigns
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each window all usable space and a user command handler that tries to evaluate
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all send commands as scheme code.
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.
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.P
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.RS
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.EX
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(install-handler 'user-command (lambda (cmd tags output)
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(eval-string cmd)))
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(install-handler 'layout-demand (lambda (view-count width height tags output)
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(letrec ((iter (lambda (n)
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(if (eq? 0 n)
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'()
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(append (list (list 0 0 width height))
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(iter (1- n)))))))
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(iter view-count))))
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.EE
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.RE
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.
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.
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.SH SEE ALSO
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.BR river (1),
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.BR riverctl (1),
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.BR rivertile (1),
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.BR guile (1)
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.
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.
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.SH AUTHOR
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.P
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.MT leonhenrik.plickat@stud.uni-goettingen.de
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Leon Henrik Plickat
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.ME
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