1 files changed, 24 insertions, 4 deletions
diff --git a/internal/tmuxedit/pane.go b/internal/tmuxedit/pane.go
index aae2d69..0b6be93 100644
--- a/internal/tmuxedit/pane.go
+++ b/internal/tmuxedit/pane.go
@@ -7,8 +7,20 @@ import (
 	"strings"
 )
 
-// runCommand is the seam for exec.Command().Output(). Override in tests.
-var runCommand = func(name string, args ...string) ([]byte, error) {
+type tmuxEditDeps struct {
+	runCommand      func(string, ...string) ([]byte, error)
+	capturePane     func(string) (string, error)
+	openEditorPopup func(string, string, string) (string, error)
+	sendKeys        func(string, ...string) error
+	sendRepeatedKey func(string, string, int) error
+	sleepAfterClear func()
+	launchPopup     func(string, string, string, string) error
+}
+
+func (d tmuxEditDeps) command(name string, args ...string) ([]byte, error) {
+	if d.runCommand != nil {
+		return d.runCommand(name, args...)
+	}
 	return exec.Command(name, args...).Output()
 }
 
@@ -16,6 +28,10 @@ var runCommand = func(name string, args ...string) ([]byte, error) {
 // chain: explicit flag > HEXAI_TMUX_PANE env var > tmux query for active pane.
 // Returns the pane ID (e.g. "%5") or an error.
 func resolveTargetPane(flagPane string) (string, error) {
+	return tmuxEditDeps{}.resolveTargetPane(flagPane)
+}
+
+func (d tmuxEditDeps) resolveTargetPane(flagPane string) (string, error) {
 	// 1. Explicit --pane flag
 	if p := strings.TrimSpace(flagPane); p != "" {
 		return p, nil
@@ -25,12 +41,16 @@ func resolveTargetPane(flagPane string) (string, error) {
 		return p, nil
 	}
 	// 3. Query tmux for the active pane in the current window
-	return queryActivePane()
+	return d.queryActivePane()
 }
 
 // queryActivePane asks tmux for the active pane ID using display-message.
 func queryActivePane() (string, error) {
-	out, err := runCommand("tmux", "display-message", "-p", "#{pane_id}")
+	return tmuxEditDeps{}.queryActivePane()
+}
+
+func (d tmuxEditDeps) queryActivePane() (string, error) {
+	out, err := d.command("tmux", "display-message", "-p", "#{pane_id}")
 	if err != nil {
 		return "", fmt.Errorf("cannot determine tmux pane: %w", err)
 	}