986f076276
Add a new generic container registry client via a new `container` package. Use this to create a command line utility as well as a new upload target for container registries. The code uses the github.com/containers/* project and packages to interact with container registires that is also used by skopeo, podman et al. One if the dependencies is `proglottis/gpgme` that is using cgo to bind libgpgme, so we have to add the corresponding devel package to the BuildRequires as well as installing it on CI. Checks will follow later via an integration test.
84 lines
1.8 KiB
Go
84 lines
1.8 KiB
Go
package cwriter
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import (
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"bytes"
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"errors"
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"io"
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"os"
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"strconv"
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)
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// ErrNotTTY not a TeleTYpewriter error.
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var ErrNotTTY = errors.New("not a terminal")
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// https://github.com/dylanaraps/pure-sh-bible#cursor-movement
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const (
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escOpen = "\x1b["
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cuuAndEd = "A\x1b[J"
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)
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// Writer is a buffered the writer that updates the terminal. The
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// contents of writer will be flushed when Flush is called.
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type Writer struct {
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out io.Writer
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buf bytes.Buffer
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lines int
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fd int
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isTerminal bool
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}
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// New returns a new Writer with defaults.
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func New(out io.Writer) *Writer {
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w := &Writer{out: out}
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if f, ok := out.(*os.File); ok {
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w.fd = int(f.Fd())
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w.isTerminal = IsTerminal(w.fd)
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}
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return w
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}
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// Flush flushes the underlying buffer.
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func (w *Writer) Flush(lines int) (err error) {
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// some terminals interpret 'cursor up 0' as 'cursor up 1'
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if w.lines > 0 {
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err = w.clearLines()
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if err != nil {
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return
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}
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}
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w.lines = lines
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_, err = w.buf.WriteTo(w.out)
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return
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}
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// Write appends the contents of p to the underlying buffer.
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func (w *Writer) Write(p []byte) (n int, err error) {
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return w.buf.Write(p)
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}
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// WriteString writes string to the underlying buffer.
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func (w *Writer) WriteString(s string) (n int, err error) {
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return w.buf.WriteString(s)
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}
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// ReadFrom reads from the provided io.Reader and writes to the
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// underlying buffer.
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func (w *Writer) ReadFrom(r io.Reader) (n int64, err error) {
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return w.buf.ReadFrom(r)
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}
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// GetWidth returns width of underlying terminal.
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func (w *Writer) GetWidth() (int, error) {
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if !w.isTerminal {
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return -1, ErrNotTTY
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}
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tw, _, err := GetSize(w.fd)
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return tw, err
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}
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func (w *Writer) ansiCuuAndEd() error {
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buf := make([]byte, 8)
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buf = strconv.AppendInt(buf[:copy(buf, escOpen)], int64(w.lines), 10)
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_, err := w.out.Write(append(buf, cuuAndEd...))
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return err
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}
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