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(define-module (tw services desktop)
#:use-module (gnu)
#:use-module (gnu home services)
#:use-module (gnu home services shepherd)
#:use-module ((gnu packages networking) #:select (blueman))
#:use-module ((gnu packages wm) #:select (polybar))
#:use-module ((gnu packages xdisorg) #:select (numlockx hsetroot))
#:use-module ((gnu packages xorg) #:select (xrandr xset))
#:use-module (gnu services configuration)
#:use-module (guix gexp)
#:use-module (guix packages)
#:use-module ((guix records) #:select (match-record))
#:use-module (srfi srfi-1)
#:use-module (srfi srfi-26)
#:use-module ((tw theme) #:select (catppuccin-polybar))
#:export (home-desktop-layout-configuration
home-monitor-configuration
home-desktop-layout-service-type
home-blueman-service-type))
;; Monitor layout and polybars
(define-maybe/no-serialization string)
(define (list-of-strings? thing)
(and (list? thing) (every string? thing)))
(define-configuration/no-serialization home-monitor-configuration
(name string "The monitor's name in X11.")
(xrandr-options (list-of-strings '()) "Options to pass to xrandr to
configure this monitor."))
(define (list-of-monitors? thing)
(and (list? thing) (every home-monitor-configuration? thing)))
(define-configuration/no-serialization home-desktop-layout-configuration
(desktop-background string "Path to an image that will be set as the desktop
background. An initial @code{~/} is replaced with $HOME/.")
(battery-name maybe-string "The device name of the system's battery, if any.
See @code{/sys/class/power_supply}.")
(ac-adapter-name maybe-string "The device name of the system's mains power
supply, if any. See @code{/sys/class/power_supply}.")
(monitors list-of-monitors "List of monitor declarations to apply."))
(define (polybar-config monitors)
`(("polybar/config.ini" ,(local-file "files/polybar.ini"))
("polybar/catppuccin.ini" ,catppuccin-polybar)))
(define polybar-wrapper
(program-file "polybar-wrapper"
#~(begin
;; This wrapper program checks that the monitor we want to start
;; polybar on is actually connected.
(use-modules (ice-9 popen)
(ice-9 rdelim))
(let* ((connected-str (string-append (getenv "POLYBAR_MONITOR") " connected"))
(xrandr (open-pipe* OPEN_READ #$(file-append xrandr "/bin/xrandr") "-q"))
(monitor-connected?
(let loop ((line (read-line xrandr)))
(cond
((eof-object? line) #f) ; we didn't find our monitor connected
((string-prefix? connected-str line) #t) ; the monitor we want is connected
(else (loop (read-line xrandr))))))) ; keep looking
(close-pipe xrandr)
(when monitor-connected?
(execl #$(file-append polybar "/bin/polybar")))))))
(define (maybe-value maybe fallback)
(if (maybe-value-set? maybe) maybe fallback))
(define (polybar-service monitor battery-name ac-adapter-name)
(shepherd-service
(documentation (string-append "Polybar desktop bar for monitor " monitor "."))
(provision (list (symbol-append 'polybar- (string->symbol monitor))))
(requirement '(xorg-setup))
(start #~(make-forkexec-constructor
(list #$polybar-wrapper)
#:environment-variables
(cons* #$(string-append "POLYBAR_MONITOR=" monitor)
#$(string-append "POLYBAR_BATTERY=" (maybe-value battery-name ""))
#$(string-append "POLYBAR_AC_ADAPTER=" (maybe-value ac-adapter-name ""))
(default-environment-variables))))
(stop #~(make-kill-destructor))))
(define (desktop-layout-services config)
(match-record config <home-desktop-layout-configuration>
(desktop-background battery-name ac-adapter-name monitors)
(cons* (shepherd-service
(documentation "Set up X displays on login.")
(provision '(xorg-setup))
(one-shot? #t)
(start #~(lambda _
(define (replace-home path)
(if (string-prefix? "~/" path)
(string-replace path (getenv "HOME") 0 1)
path))
(system* #$(file-append numlockx "/bin/numlockx") "on")
;; Turn off the monitors if there is no input for 10 minutes.
(system* #$(file-append xset "/bin/xset") "dpms" "600" "600" "600")
;; TODO: may need one xrandr invocation per monitor; this is
; ;what tw/home/cern.scm had before.
(system* #$(file-append xrandr "/bin/xrandr")
#$@(append-map (lambda (monitor)
(match-record monitor <home-monitor-configuration>
(name xrandr-options)
`("--output" ,name ,@xrandr-options)))
monitors))
;; Set the desktop background picture. Hopefully doing this just after
;; xrandr works and sets it for both screens.
(system* #$(file-append hsetroot "/bin/hsetroot")
"-cover" (replace-home #$desktop-background)))))
(map (compose (cut polybar-service <> battery-name ac-adapter-name)
home-monitor-configuration-name)
monitors))))
(define home-desktop-layout-service-type
(service-type
(name 'desktop-layout)
(extensions
(list (service-extension home-shepherd-service-type desktop-layout-services)
(service-extension home-xdg-configuration-files-service-type polybar-config)))
(description
"Configure the desktop background, monitor layout and polybar.")))
;; Blueman
(define (blueman-services config)
(list (shepherd-service
(documentation "Blueman applet; provides a GUI for connection to bluetooth devices.")
(provision '(blueman-applet))
(start #~(make-forkexec-constructor
(list #$(file-append blueman "/bin/blueman-applet"))))
(stop #~(make-kill-destructor)))))
(define home-blueman-service-type
(service-type
(name 'blueman)
(default-value #f)
(extensions
(list (service-extension home-shepherd-service-type blueman-services)))
(description
"Run the Blueman applet for graphical Bluetooth control.")))
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