mirror of
https://github.com/go-gitea/gitea
synced 2024-09-12 04:09:41 +02:00
85 lines
2.6 KiB
Go
85 lines
2.6 KiB
Go
|
// Copyright 2022 The Gitea Authors. All rights reserved.
|
||
|
// Use of this source code is governed by a MIT-style
|
||
|
// license that can be found in the LICENSE file.
|
||
|
|
||
|
package foreachref
|
||
|
|
||
|
import (
|
||
|
"encoding/hex"
|
||
|
"fmt"
|
||
|
"io"
|
||
|
"strings"
|
||
|
)
|
||
|
|
||
|
var (
|
||
|
nullChar = []byte("\x00")
|
||
|
dualNullChar = []byte("\x00\x00")
|
||
|
)
|
||
|
|
||
|
// Format supports specifying and parsing an output format for 'git
|
||
|
// for-each-ref'. See See git-for-each-ref(1) for available fields.
|
||
|
type Format struct {
|
||
|
// fieldNames hold %(fieldname)s to be passed to the '--format' flag of
|
||
|
// for-each-ref. See git-for-each-ref(1) for available fields.
|
||
|
fieldNames []string
|
||
|
|
||
|
// fieldDelim is the character sequence that is used to separate fields
|
||
|
// for each reference. fieldDelim and refDelim should be selected to not
|
||
|
// interfere with each other and to not be present in field values.
|
||
|
fieldDelim []byte
|
||
|
// fieldDelimStr is a string representation of fieldDelim. Used to save
|
||
|
// us from repetitive reallocation whenever we need the delimiter as a
|
||
|
// string.
|
||
|
fieldDelimStr string
|
||
|
// refDelim is the character sequence used to separate reference from
|
||
|
// each other in the output. fieldDelim and refDelim should be selected
|
||
|
// to not interfere with each other and to not be present in field
|
||
|
// values.
|
||
|
refDelim []byte
|
||
|
}
|
||
|
|
||
|
// NewFormat creates a forEachRefFormat using the specified fieldNames. See
|
||
|
// git-for-each-ref(1) for available fields.
|
||
|
func NewFormat(fieldNames ...string) Format {
|
||
|
return Format{
|
||
|
fieldNames: fieldNames,
|
||
|
fieldDelim: nullChar,
|
||
|
fieldDelimStr: string(nullChar),
|
||
|
refDelim: dualNullChar,
|
||
|
}
|
||
|
}
|
||
|
|
||
|
// Flag returns a for-each-ref --format flag value that captures the fieldNames.
|
||
|
func (f Format) Flag() string {
|
||
|
var formatFlag strings.Builder
|
||
|
for i, field := range f.fieldNames {
|
||
|
// field key and field value
|
||
|
formatFlag.WriteString(fmt.Sprintf("%s %%(%s)", field, field))
|
||
|
|
||
|
if i < len(f.fieldNames)-1 {
|
||
|
// note: escape delimiters to allow control characters as
|
||
|
// delimiters. For example, '%00' for null character or '%0a'
|
||
|
// for newline.
|
||
|
formatFlag.WriteString(f.hexEscaped(f.fieldDelim))
|
||
|
}
|
||
|
}
|
||
|
formatFlag.WriteString(f.hexEscaped(f.refDelim))
|
||
|
return formatFlag.String()
|
||
|
}
|
||
|
|
||
|
// Parser returns a Parser capable of parsing 'git for-each-ref' output produced
|
||
|
// with this Format.
|
||
|
func (f Format) Parser(r io.Reader) *Parser {
|
||
|
return NewParser(r, f)
|
||
|
}
|
||
|
|
||
|
// hexEscaped produces hex-escpaed characters from a string. For example, "\n\0"
|
||
|
// would turn into "%0a%00".
|
||
|
func (f Format) hexEscaped(delim []byte) string {
|
||
|
escaped := ""
|
||
|
for i := 0; i < len(delim); i++ {
|
||
|
escaped += "%" + hex.EncodeToString([]byte{delim[i]})
|
||
|
}
|
||
|
return escaped
|
||
|
}
|