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package libfastimport
import (
"bufio"
"io"
"strings"
"git.lukeshu.com/go/libfastimport/textproto"
)
type UnsupportedCommand string
func (e UnsupportedCommand) Error() string {
return "Unsupported command: " + string(e)
}
type cmderror struct {
Cmd
error
}
// A Frontend is something that produces a fast-import stream; the
// Frontend object provides methods for reading from it.
type Frontend struct {
fir *textproto.FIReader
cbw *textproto.CatBlobWriter
w *bufio.Writer
c chan cmderror
}
func NewFrontend(fastImport io.Reader, catBlob io.Writer) *Frontend {
ret := Frontend{}
ret.fir = textproto.NewFIReader(fastImport)
if catBlob != nil {
ret.w = bufio.NewWriter(catBlob)
ret.cbw = textproto.NewCatBlobWriter(ret.w)
}
return &ret
}
func (f *Frontend) nextLine() (line string, err error) {
retry:
line, err = f.fir.ReadLine()
if err != nil {
return
}
switch {
case strings.HasPrefix(line, "#"):
f.c <- cmderror{CmdComment{Comment: line[1:]}, nil}
goto retry
case strings.HasPrefix(line, "cat-blob "):
f.c <- parse_cat_blob(line)
goto retry
case strings.HasPrefix(line, "get-mark "):
f.c <- parse_get_mark(line)
goto retry
default:
return
}
}
func (f *Frontend) parse() {
for {
line, err := f.nextLine()
if err != nil {
f.c <- cmderror{nil, err}
return
}
switch {
case strings.HasPrefix(line, "blob "):
case strings.HasPrefix(line, "commit "):
case strings.HasPrefix(line, "checkpoint\n"):
case strings.HasPrefix(line, "done\n"):
case strings.HasPrefix(line, "feature "):
case strings.HasPrefix(line, "ls "):
case strings.HasPrefix(line, "option "):
case strings.HasPrefix(line, "progress "):
case strings.HasPrefix(line, "reset "):
case strings.HasPrefix(line, "tag "):
default:
f.c <- cmderror{nil, UnsupportedCommand(line)}
return
}
}
}
func (f *Frontend) ReadCmd() (Cmd, error) {
cmderror := <-f.c
cmd := cmderror.Cmd
err := cmderror.error
return cmderror.Cmd, cmderror.error
}
func (f *Frontend) RespondGetMark(sha1 string) error {
// TODO
return f.w.Flush()
}
func (f *Frontend) RespondCatBlob(sha1 string, data string) error {
// TODO
return f.w.Flush()
}
func (f *Frontend) RespondLs(mode textproto.Mode, dataref string, path textproto.Path) error {
// TODO
return f.w.Flush()
}
|
