Hello world

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

internal/linkhandler/apps.go

@@ -0,0 +1,100 @@
+package linkhandler
+
+import (
+	"os/exec"
+	"path/filepath"
+	"runtime"
+	"strconv"
+	"strings"
+)
+
+// macOS apps: where a link was clicked (the frontmost app; the link
+// handler runs in the background, so it doesn't change it), and which app
+// a process's terminal belongs to. Elsewhere these know nothing.
+
+// App is a running macOS app: its bundle path and process ID.
+type App struct {
+	Bundle string
+	PID    int
+}
+
+// FrontApp is the frontmost app.
+func FrontApp() App {
+	if runtime.GOOS != "darwin" {
+		return App{}
+	}
+	asn, err := exec.Command("lsappinfo", "front").Output()
+	if err != nil {
+		return App{}
+	}
+	out, err := exec.Command("lsappinfo", "info", "-only", "pid", "-only", "bundlepath", strings.TrimSpace(string(asn))).Output()
+	if err != nil {
+		return App{}
+	}
+	var a App
+	for _, l := range strings.Split(string(out), "\n") {
+		k, v, _ := strings.Cut(strings.TrimSpace(l), "=")
+		switch strings.Trim(k, `"`) {
+		case "pid":
+			a.PID, _ = strconv.Atoi(v)
+		case "LSBundlePath":
+			a.Bundle = strings.Trim(v, `"`)
+		}
+	}
+	return a
+}
+
+// HostApp is the app bundle among pid's ancestors (the terminal it runs
+// in), "" if none.
+func HostApp(pid int) string {
+	if runtime.GOOS != "darwin" {
+		return ""
+	}
+	for range 32 {
+		out, err := exec.Command("ps", "-o", "ppid=,comm=", "-p", strconv.Itoa(pid)).Output()
+		if err != nil {
+			return ""
+		}
+		ppid, comm, _ := strings.Cut(strings.TrimSpace(string(out)), " ")
+		// The innermost bundle: kitty's quick access terminal is one
+		// inside kitty.app.
+		if i := strings.LastIndex(comm, ".app/Contents/MacOS/"); i >= 0 {
+			return comm[:i+len(".app")]
+		}
+		if pid, err = strconv.Atoi(ppid); err != nil || pid <= 1 {
+			return ""
+		}
+	}
+	return ""
+}
+
+// IsTerminal reports whether bundle is a terminal app.
+func IsTerminal(bundle string) bool {
+	name := strings.ToLower(filepath.Base(bundle))
+	for _, t := range []string{"kitty", "ghostty", "wezterm", "iterm", "terminal.app", "alacritty", "warp"} {
+		if strings.Contains(name, t) {
+			return true
+		}
+	}
+	return false
+}
+
+// IsDropdown reports whether bundle is a terminal shown only by a hotkey
+// (kitty's quick access terminal): activating it doesn't show it.
+func IsDropdown(bundle string) bool { return strings.Contains(bundle, "quick-access") }
+
+// ShowDropdown shows a hidden dropdown terminal (it toggles: call it only
+// when the dropdown isn't frontmost).
+func ShowDropdown(bundle string) {
+	if i := strings.Index(bundle, "kitty.app"); i >= 0 {
+		kitten := bundle[:i+len("kitty.app")] + "/Contents/MacOS/kitten"
+		_ = exec.Command(kitten, "quick-access-terminal").Start()
+	}
+}
+
+// Activate brings the app to the front.
+func Activate(bundle string) {
+	if runtime.GOOS == "darwin" && bundle != "" {
+		_ = exec.Command("open", "-a", bundle).Run()
+	}
+}