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1// Copyright 2022 The Gitea Authors. All rights reserved.
2// SPDX-License-Identifier: MIT
3
4package foreachref
5
6import (
7 "encoding/hex"
8 "fmt"
9 "io"
10 "strings"
11)
12
13var (
14 nullChar = []byte("\x00")
15 dualNullChar = []byte("\x00\x00")
16)
17
18// Format supports specifying and parsing an output format for 'git
19// for-each-ref'. See See git-for-each-ref(1) for available fields.
20type Format struct {
21 // fieldNames hold %(fieldname)s to be passed to the '--format' flag of
22 // for-each-ref. See git-for-each-ref(1) for available fields.
23 fieldNames []string
24
25 // fieldDelim is the character sequence that is used to separate fields
26 // for each reference. fieldDelim and refDelim should be selected to not
27 // interfere with each other and to not be present in field values.
28 fieldDelim []byte
29 // fieldDelimStr is a string representation of fieldDelim. Used to save
30 // us from repetitive reallocation whenever we need the delimiter as a
31 // string.
32 fieldDelimStr string
33 // refDelim is the character sequence used to separate reference from
34 // each other in the output. fieldDelim and refDelim should be selected
35 // to not interfere with each other and to not be present in field
36 // values.
37 refDelim []byte
38}
39
40// NewFormat creates a forEachRefFormat using the specified fieldNames. See
41// git-for-each-ref(1) for available fields.
42func NewFormat(fieldNames ...string) Format {
43 return Format{
44 fieldNames: fieldNames,
45 fieldDelim: nullChar,
46 fieldDelimStr: string(nullChar),
47 refDelim: dualNullChar,
48 }
49}
50
51// Flag returns a for-each-ref --format flag value that captures the fieldNames.
52func (f Format) Flag() string {
53 var formatFlag strings.Builder
54 for i, field := range f.fieldNames {
55 // field key and field value
56 formatFlag.WriteString(fmt.Sprintf("%s %%(%s)", field, field))
57
58 if i < len(f.fieldNames)-1 {
59 // note: escape delimiters to allow control characters as
60 // delimiters. For example, '%00' for null character or '%0a'
61 // for newline.
62 formatFlag.WriteString(f.hexEscaped(f.fieldDelim))
63 }
64 }
65 formatFlag.WriteString(f.hexEscaped(f.refDelim))
66 return formatFlag.String()
67}
68
69// Parser returns a Parser capable of parsing 'git for-each-ref' output produced
70// with this Format.
71func (f Format) Parser(r io.Reader) *Parser {
72 return NewParser(r, f)
73}
74
75// hexEscaped produces hex-escpaed characters from a string. For example, "\n\0"
76// would turn into "%0a%00".
77func (f Format) hexEscaped(delim []byte) string {
78 escaped := ""
79 for i := 0; i < len(delim); i++ {
80 escaped += "%" + hex.EncodeToString([]byte{delim[i]})
81 }
82 return escaped
83}