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package askcli
import (
"context"
"errors"
"fmt"
"io"
"os/exec"
"path/filepath"
"strings"
)
type binaryFinder func() (string, error)
type repoTopLevelDetector func(context.Context) (string, error)
type commandRunner func(context.Context, string, []string, io.Reader, io.Writer, io.Writer) error
type Executor struct {
commandName string
findBinary binaryFinder
detectRepoRoot repoTopLevelDetector
runCommand commandRunner
}
func NewExecutor(commandName string) Executor {
return Executor{
commandName: strings.TrimSpace(commandName),
findBinary: findTaskBinary,
detectRepoRoot: detectRepoRoot,
runCommand: runTaskCommand,
}
}
func (e Executor) taskArgs(repoRoot string, args []string) ([]string, error) {
projectName, err := projectNameFromRoot(repoRoot)
if err != nil {
return nil, err
}
return append([]string{"project:" + projectName, "+agent"}, args...), nil
}
func (e Executor) Run(ctx context.Context, args []string, stdin io.Reader, stdout, stderr io.Writer) (int, error) {
executor := normalizeExecutor(e)
taskPath, err := executor.findBinary()
if err != nil {
return 1, fmt.Errorf("%s: task binary lookup failed: %w", executor.label(), err)
}
repoRoot, err := executor.detectRepoRoot(ctx)
if err != nil {
return 1, fmt.Errorf("%s: must be run inside a git repository: %w", executor.label(), err)
}
taskArgs, err := executor.taskArgs(repoRoot, args)
if err != nil {
return 1, fmt.Errorf("%s: %w", executor.label(), err)
}
if err := executor.runCommand(ctx, taskPath, taskArgs, stdin, stdout, stderr); err != nil {
return exitCodeFor(err), nil
}
return 0, nil
}
func (e Executor) label() string {
label := strings.TrimSpace(e.commandName)
if label == "" {
return "ask"
}
return label
}
func normalizeExecutor(e Executor) Executor {
if e.commandName == "" {
e.commandName = "ask"
}
if e.findBinary == nil {
e.findBinary = findTaskBinary
}
if e.detectRepoRoot == nil {
e.detectRepoRoot = detectRepoRoot
}
if e.runCommand == nil {
e.runCommand = runTaskCommand
}
return e
}
func projectNameFromRoot(repoRoot string) (string, error) {
projectName := filepath.Base(strings.TrimSpace(repoRoot))
if projectName == "" || projectName == "." || projectName == string(filepath.Separator) {
return "", fmt.Errorf("could not derive project name from git root %q", repoRoot)
}
return projectName, nil
}
func findTaskBinary() (string, error) {
path, err := exec.LookPath("task")
if err != nil {
return "", fmt.Errorf("task binary 'task' not found in PATH; install task and retry")
}
return path, nil
}
func detectRepoRoot(ctx context.Context) (string, error) {
out, err := exec.CommandContext(ctx, "git", "rev-parse", "--show-toplevel").Output()
if err != nil {
return "", fmt.Errorf("must be run inside a git repository so project name can be derived")
}
root := strings.TrimSpace(string(out))
if root == "" {
return "", fmt.Errorf("git returned an empty repository root")
}
return root, nil
}
func runTaskCommand(ctx context.Context, name string, args []string, stdin io.Reader, stdout, stderr io.Writer) error {
cmd := exec.CommandContext(ctx, name, args...)
cmd.Stdin = stdin
cmd.Stdout = stdout
cmd.Stderr = stderr
return cmd.Run()
}
func exitCodeFor(err error) int {
var exitErr *exec.ExitError
if errors.As(err, &exitErr) {
return exitErr.ExitCode()
}
return 1
}
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