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package tmuxedit
import (
"fmt"
"os"
"os/exec"
"strings"
)
// runCommand is the seam for exec.Command().Output(). Override in tests.
var runCommand = func(name string, args ...string) ([]byte, error) {
return exec.Command(name, args...).Output()
}
// resolveTargetPane determines which tmux pane to target using a fallback
// 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) {
// 1. Explicit --pane flag
if p := strings.TrimSpace(flagPane); p != "" {
return p, nil
}
// 2. Environment variable
if p := strings.TrimSpace(os.Getenv("HEXAI_TMUX_PANE")); p != "" {
return p, nil
}
// 3. Query tmux for the active pane in the current window
return 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}")
if err != nil {
return "", fmt.Errorf("cannot determine tmux pane: %w", err)
}
pane := strings.TrimSpace(string(out))
if pane == "" {
return "", fmt.Errorf("tmux returned empty pane ID")
}
return pane, nil
}
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