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// Copyright (C) 2017-2018, 2021 Luke Shumaker <lukeshu@lukeshu.com>
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <https://www.gnu.org/licenses/>.
// Package libfastimport implements reading and writing of git
// fast-import streams.
//
// The documentation here focuses on use of the package itself; it
// generally assumes a working understanding of the format.
// Documentation on the format itself can be found in the
// git-fast-import(1) man-page.
//
// A program can write commands to a backend by wrapping the
// appropriate io.Writer with a Backend object.
//
// A program can read commands from a frontend by wrapping the
// appropriate io.Reader with a Frontend object.
package libfastimport
type fiReader interface {
PeekLine() (string, error)
ReadLine() (string, error)
}
type fiWriter interface {
WriteData(string) error
WriteLine(a ...interface{}) error
}
type cmdClass int
const (
cmdClassCommand cmdClass = 1 << iota // can be a top-level command
cmdClassInCommit // can be used within in a commit
cmdClassInCommand // can be used in-between lines of another multi-line command
cmdClassComment = cmdClassCommand | cmdClassInCommit | cmdClassInCommand // "can be used anywhere in the stream that comments are accepted"
)
// Cmd is a command that may be found in a fast-import stream.
type Cmd interface {
fiCmdRead(fiReader) (Cmd, error)
fiCmdWrite(fiWriter) error
fiCmdClass() cmdClass
}
func cmdIs(cmd Cmd, class cmdClass) bool {
return cmd.fiCmdClass()&class != 0
}
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