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package main
import (
"context"
"flag"
"fmt"
"io"
"os"
"path/filepath"
"time"
"codeberg.org/snonux/hexai/internal/hexaiaction"
"codeberg.org/snonux/hexai/internal/tmux"
"golang.org/x/term"
)
func main() {
infile := flag.String("infile", "", "Read input from this file instead of stdin")
outfile := flag.String("outfile", "", "Write output to this file instead of stdout")
// Tmux/UI flags
forceTmux := flag.Bool("tmux", false, "Force running the UI in a tmux split-pane (auto if not set)")
noTmux := flag.Bool("no-tmux", false, "Disable tmux mode even if available")
uiChild := flag.Bool("ui-child", false, "INTERNAL: run interactive UI and write to -outfile atomically")
tmuxTarget := flag.String("tmux-target", "", "tmux split target (advanced)")
tmuxSplit := flag.String("tmux-split", "v", "tmux split orientation: v or h")
tmuxPercent := flag.Int("tmux-percent", 33, "tmux split size percentage (1-100)")
flag.Parse()
// Child mode: run TUI and write atomically to -outfile
if *uiChild {
if err := runChild(*infile, *outfile); err != nil {
fmt.Fprintln(os.Stderr, err)
os.Exit(1)
}
return
}
// Parent mode: decide inline vs tmux
if shouldRunInTmux(*forceTmux, *noTmux) {
if err := runInTmuxParent(*tmuxTarget, *tmuxSplit, *tmuxPercent); err != nil {
fmt.Fprintln(os.Stderr, err)
os.Exit(1)
}
return
}
// Inline path: only if we have a TTY for UI; otherwise echo input
if isTTY(os.Stdout.Fd()) && isTTY(os.Stdin.Fd()) {
in, out, closeIn, closeOut, err := openIO(*infile, *outfile)
if err != nil {
fmt.Fprintln(os.Stderr, err)
os.Exit(1)
}
defer closeIn()
defer closeOut()
if err := hexaiactionRun(context.Background(), in, out, os.Stderr); err != nil {
fmt.Fprintln(os.Stderr, err)
os.Exit(1)
}
return
}
// Fallback: no TTY and tmux not available; echo input to output
if err := echoThrough(*infile, *outfile); err != nil {
fmt.Fprintln(os.Stderr, err)
os.Exit(1)
}
}
// openIO returns readers/writers for infile/outfile flags with deferred closers.
func openIO(infile, outfile string) (io.Reader, io.Writer, func(), func(), error) {
in := io.Reader(os.Stdin)
out := io.Writer(os.Stdout)
closeIn := func() {}
closeOut := func() {}
if path := infile; path != "" {
f, err := os.Open(path)
if err != nil {
return nil, nil, func() {}, func() {}, fmt.Errorf("hexai-action: cannot open infile: %w", err)
}
in = f
closeIn = func() { _ = f.Close() }
}
if path := outfile; path != "" {
f, err := os.Create(path)
if err != nil {
return nil, nil, func() {}, func() {}, fmt.Errorf("hexai-action: cannot open outfile: %w", err)
}
out = f
closeOut = func() { _ = f.Close() }
}
return in, out, closeIn, closeOut, nil
}
// runChild runs the interactive flow and writes the final output atomically to outfile.
var hexaiactionRun = hexaiaction.Run
func runChild(infile, outfile string) error {
if outfile == "" {
// No atomic handoff needed; just run normally to stdout
in, out, closeIn, closeOut, err := openIO(infile, "")
if err != nil {
return err
}
defer closeIn()
defer closeOut()
return hexaiactionRun(context.Background(), in, out, os.Stderr)
}
tmp := outfile + ".tmp"
in, out, closeIn, closeOut, err := openIO(infile, tmp)
if err != nil {
return err
}
defer closeIn()
if err := hexaiactionRun(context.Background(), in, out, os.Stderr); err != nil {
// On error, try to echo input to tmp to avoid blocking
closeOut()
if copyErr := echoThrough(infile, tmp); copyErr != nil {
return fmt.Errorf("hexai-action child: %v; echo failed: %v", err, copyErr)
}
} else {
closeOut()
}
return os.Rename(tmp, outfile)
}
var isTTYFn = isTTY
var tmuxAvailableFn = tmux.Available
var splitRunFn = tmux.SplitRun
var osExecutableFn = os.Executable
func shouldRunInTmux(forceTmux, noTmux bool) bool {
if noTmux {
return false
}
if forceTmux {
return true
}
// Auto: prefer tmux when stdio are not TTYs (Helix :pipe scenario)
if !(isTTYFn(os.Stdin.Fd()) && isTTYFn(os.Stdout.Fd())) && tmuxAvailableFn() {
return true
}
return false
}
func isTTY(fd uintptr) bool { return term.IsTerminal(int(fd)) }
func runInTmuxParent(target, split string, percent int) error {
// Prepare temp files
dir, err := os.MkdirTemp("", "hexai-action-")
if err != nil {
return err
}
defer func() { _ = os.RemoveAll(dir) }()
inPath := filepath.Join(dir, "input.txt")
outPath := filepath.Join(dir, "reply.txt")
// Read stdin and persist to inPath
if err := persistStdin(inPath); err != nil {
return err
}
// Build child argv
exe, err := osExecutableFn()
if err != nil {
return err
}
argv := []string{exe, "-ui-child", "-infile", inPath, "-outfile", outPath}
// Spawn tmux split
opts := tmux.SplitOpts{Target: target, Vertical: split != "h", Percent: percent}
if err := splitRunFn(opts, argv); err != nil {
return err
}
// Wait for outfile to appear
if err := waitForFile(outPath, 60*time.Second); err != nil {
return err
}
// Print to stdout
return catFileToStdout(outPath)
}
func persistStdin(path string) error {
f, err := os.Create(path)
if err != nil {
return err
}
defer func() { _ = f.Close() }()
if _, err := io.Copy(f, os.Stdin); err != nil {
return err
}
return f.Sync()
}
func waitForFile(path string, timeout time.Duration) error {
deadline := time.Now().Add(timeout)
for {
if _, err := os.Stat(path); err == nil {
return nil
}
if time.Now().After(deadline) {
return fmt.Errorf("hexai-action: timeout waiting for reply file")
}
time.Sleep(200 * time.Millisecond)
}
}
func catFileToStdout(path string) error {
f, err := os.Open(path)
if err != nil {
return err
}
defer func() { _ = f.Close() }()
_, err = io.Copy(os.Stdout, f)
return err
}
func echoThrough(infile, outfile string) error {
// Read from infile or stdin and write to outfile or stdout
var in io.Reader = os.Stdin
var out io.Writer = os.Stdout
if infile != "" {
f, err := os.Open(infile)
if err != nil {
return err
}
defer func() { _ = f.Close() }()
in = f
}
if outfile != "" {
f, err := os.Create(outfile)
if err != nil {
return err
}
defer func() { _ = f.Close() }()
out = f
}
_, err := io.Copy(out, in)
return err
}
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