mesh-catalog/modules/xorg/cmd/xorg/main.go

// xorg's tools (novox/hq ADR 0208, research 026/05): node-display-server's verbs `displays` and
// `layout`, and the module's own tools for one output's mode, the primary output, DPI, input devices,
// the keyboard map, a screenshot and the server's log.
//
// Every tool that touches the screen acts in the operator's running session, which it finds through
// internal/desktop: the node's runtime has none of its own. With no session, the answer says so as
// structured data. A tool that changes the running server changes it until the next login; the
// answer says what makes it last.
package main

import (
	"context"
	"fmt"
	"os"
	"time"

	stdio "git.novox.be/novox/mesh-sdk/go"

	"xorg/internal/desktop"
)

// The session's holders this module prefers as the session's own process.
var sessionHolders = []string{"i3", "sway", "openbox", "bspwm", "awesome", "xmonad"}

func main() {
	if err := stdio.Serve("", tools(desktop.Machine(sessionHolders...))); err != nil {
		fmt.Fprintln(os.Stderr, err)
		os.Exit(1)
	}
}

// call bounds one tool call below the runtime's 30 s limit.
func call(run func(ctx context.Context, a desktop.Args) (any, error)) func(map[string]any) (any, error) {
	return func(args map[string]any) (any, error) {
		ctx, cancel := context.WithTimeout(context.Background(), 25*time.Second)
		defer cancel()
		return run(ctx, desktop.Args(args))
	}
}

func tools(d desktop.Desk) []stdio.Tool {
	x := xorg{d: d}
	return []stdio.Tool{
		{
			Name: "node-display-server.displays",
			Description: "The X screen and every output: connected or not, primary, where it sits, its rotation, " +
				"physical size and DPI, the monitor's identity from its EDID (manufacturer, product, serial, name, " +
				"fingerprint), the current and preferred mode, and every mode with its rates. Disconnected outputs " +
				"are listed by name only unless all is true. Also the autorandr profile in force, when one matches.",
			Input: desktop.Schema(map[string]any{
				"all":   desktop.Flag("list disconnected outputs in full (default false)"),
				"modes": desktop.Flag("list every mode of each output (default true)"),
			}),
			Run: call(x.displays),
		},
		{
			Name: "node-display-server.layout",
			Description: "Monitor layout profiles (autorandr), keyed by the connected monitors' identities, so one " +
				"profile needs no machine's name. list: every profile with the monitors it is for, which match " +
				"the monitors connected now and which is in force. save: the current arrangement under a name " +
				"(replace true to overwrite). apply: load one. The profiles are the operator's data, never the mesh's.",
			Input: desktop.Schema(map[string]any{
				"action":  desktop.Enum("list, save or apply", "list", "save", "apply"),
				"name":    desktop.Str("the profile to save or apply"),
				"replace": desktop.Flag("save over an existing profile of that name (default false)"),
			}, "action"),
			Run: call(x.layout),
		},
		{
			Name: "xorg_set_mode",
			Description: "Change one output now, through xrandr: its mode (WxH, or auto for the preferred one), rate, " +
				"rotation, scale, position (x/y, or beside another output), on or off, primary. dry_run answers " +
				"the command without running it. Lasts until the next login or hotplug: save a layout profile to keep it.",
			Input: desktop.Schema(map[string]any{
				"output":   desktop.Str("the output, as displays names it (e.g. eDP-1)"),
				"mode":     desktop.Str("WxH, or auto for the monitor's preferred mode"),
				"rate":     desktop.Num("refresh rate in Hz"),
				"rotate":   desktop.Enum("rotation", "normal", "left", "right", "inverted"),
				"scale":    desktop.Num("scale factor, 0.25 to 4 (1 = none)"),
				"x":        desktop.Int("left edge on the screen, in pixels"),
				"y":        desktop.Int("top edge on the screen, in pixels"),
				"relation": desktop.Enum("place it beside another output instead of at x/y", "right-of", "left-of", "above", "below", "same-as"),
				"of":       desktop.Str("the output the relation is to"),
				"off":      desktop.Flag("switch the output off"),
				"primary":  desktop.Flag("make it the primary output"),
				"dry_run":  desktop.Flag("answer the command, run nothing"),
			}, "output"),
			Run: call(x.setMode),
		},
		{
			Name:        "xorg_primary",
			Description: "Which output is primary (the one the bar's tray and new windows prefer); with output, make it primary now.",
			Input:       desktop.Schema(map[string]any{"output": desktop.Str("the output to make primary (optional)")}),
			Run:         call(x.primary),
		},
		{
			Name: "xorg_dpi",
			Description: "The DPI X programs are told (Xft.dpi) beside each monitor's physical DPI. With value, set " +
				"Xft.dpi and the screen's DPI now: programs started after it use it. The module's resources file " +
				"sets it again at the next login (96 until it is a setting).",
			Input: desktop.Schema(map[string]any{"value": desktop.Int("dots per inch, 48 to 480 (optional)")}),
			Run:   call(x.dpi),
		},
		{
			Name: "xorg_input_devices",
			Description: "The input devices the X server knows: id, name, pointer or keyboard, master or slave, and " +
				"for each pointer its libinput settings (tap, natural scroll, acceleration, disable while typing, " +
				"left handed, enabled).",
			Input: desktop.Schema(map[string]any{"name": desktop.Str("only devices whose name contains this (optional)")}),
			Run:   call(x.inputDevices),
		},
		{
			Name: "xorg_input_set",
			Description: "Change libinput settings of a device now: tap, tap_drag, natural_scroll, disable_while_typing, " +
				"left_handed, middle_emulation, enabled (true/false), accel_speed (-1 to 1). The device is an id or a " +
				"name; a name applies to every device of that name that has the setting. Lasts until the device " +
				"reconnects or the next login.",
			Input: desktop.Schema(map[string]any{
				"device":               desktop.Str("the device's id or exact name"),
				"tap":                  desktop.Flag("tap to click"),
				"tap_drag":             desktop.Flag("tap and drag"),
				"natural_scroll":       desktop.Flag("natural (reversed) scrolling"),
				"disable_while_typing": desktop.Flag("ignore the touchpad while typing"),
				"left_handed":          desktop.Flag("swap the buttons"),
				"middle_emulation":     desktop.Flag("both buttons together are the middle one"),
				"enabled":              desktop.Flag("the device takes input at all"),
				"accel_speed":          desktop.Num("pointer acceleration, -1 to 1"),
			}, "device"),
			Run: call(x.inputSet),
		},
		{
			Name: "xorg_keyboard",
			Description: "The X keyboard map: rules, model, layout, variant and options. With layout, variant, model " +
				"or options, set them now (options replace the current ones; an empty list clears them). Lasts " +
				"until the next login.",
			Input: desktop.Schema(map[string]any{
				"layout":  desktop.Str("e.g. us, be, us,be"),
				"variant": desktop.Str("e.g. intl"),
				"model":   desktop.Str("e.g. pc105"),
				"options": desktop.List("e.g. [\"caps:escape\", \"compose:ralt\"]"),
			}),
			Run: call(x.keyboard),
		},
		{
			Name: "xorg_screenshot",
			Description: "Take a screenshot to a PNG file: the whole screen, one output, or one window by its X id. " +
				"Written under the account's home (default ~/Pictures/Screenshots/screenshot-<time>.png). Answers " +
				"the path, size and bytes, never the image.",
			Input: desktop.Schema(map[string]any{
				"output": desktop.Str("only this output (optional)"),
				"window": desktop.Str("only this window, by its X id, e.g. 0x3a00007 (optional)"),
				"path":   desktop.Str("where to write it, inside the home (optional)"),
			}),
			Run: call(x.screenshot),
		},
		{
			Name: "xorg_x_log",
			Description: "The X server's log for the running session (or the newest one): its version, when it " +
				"started, and its errors — with warnings when asked — newest last.",
			Input: desktop.Schema(map[string]any{
				"warnings": desktop.Flag("include warnings (default false)"),
				"limit":    desktop.Int("at most this many lines (default 100, at most 1000)"),
			}),
			Run: call(x.xlog),
		},
	}
}