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cmd.go
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cmd.go
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package main
import (
"context"
"io"
"os"
"os/exec"
"github.com/pkg/errors"
)
func stdIoLSConn(ctx context.Context, name string, arg ...string) (io.ReadWriteCloser, error) {
cmd := exec.CommandContext(ctx, name, arg...)
stdin, err := cmd.StdinPipe()
if err != nil {
return nil, errors.Wrap(err, "failed to create stdin pipe for language server")
}
stdout, err := cmd.StdoutPipe()
if err != nil {
return nil, errors.Wrap(err, "failed to create stdout pipe for language server")
}
cmd.Stderr = os.Stderr
if err := cmd.Start(); err != nil {
return nil, errors.Wrap(err, "failed to start cmd for language server")
}
return &cmdRWCloser{
Cmd: cmd,
Reader: stdout,
Writer: stdin,
}, nil
}
type cmdRWCloser struct {
*exec.Cmd
// Reader and Writer do not need to be Closers since they are StdoutPipe
// and StdinPipe respectively. Both of those will be closed by Cmd.Wait.
io.Reader
io.Writer
}
func (c *cmdRWCloser) Close() error {
if err := c.Cmd.Process.Kill(); err != nil {
return errors.Wrap(err, "unable to kill process during cmdRWCloser.Close()")
}
if err := c.Cmd.Wait(); err != nil {
return errors.Wrap(err, "unable to wait on cmd to finish during cmdRWCloser.Close()")
}
return nil
}