tmp

completers/wl-mirror_completer/cmd/root.go

@@ -2,6 +2,7 @@ package cmd
 
 import (
 	"github.com/carapace-sh/carapace"
+	"github.com/carapace-sh/carapace-bin/pkg/actions/tools/sway"
 	"github.com/spf13/cobra"
 )
 
@@ -73,4 +74,8 @@ func init() {
 			"270", "apply a clockwise rotation",
 		).UniqueList("-"),
 	})
+
+	carapace.Gen(rootCmd).PositionalCompletion(
+		sway.ActionOutputs(), // TODO other sources
+	)
 }

pkg/actions/tools/sway/output.go

@@ -0,0 +1,38 @@
+package sway
+
+import (
+	"encoding/json"
+	"fmt"
+
+	"github.com/carapace-sh/carapace"
+)
+
+type swayOutput struct {
+	Name  string
+	Make  string
+	Modes []struct {
+		Width   int
+		Height  int
+		Refresh int
+	}
+}
+
+// ActionOutputs completes outputs
+func ActionOutputs() carapace.Action {
+	return carapace.ActionExecCommand("swaymsg", "-t", "get_outputs")(func(output []byte) carapace.Action {
+		var outputs []swayOutput
+		if err := json.Unmarshal(output, &outputs); err != nil {
+			return carapace.ActionMessage(err.Error())
+		}
+
+		vals := make([]string, 0)
+		for _, o := range outputs {
+			description := o.Make
+			if len(o.Modes) > 0 {
+				description += fmt.Sprintf(" %vx%v @ %v Hz", o.Modes[0].Width, o.Modes[0].Height, float64(o.Modes[0].Refresh)/1000)
+			}
+			vals = append(vals, o.Name, description)
+		}
+		return carapace.ActionValuesDescribed(vals...)
+	})
+}