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kube-arangodb/internal/md/sections.go

105 lines
2.3 KiB
Go

//
// DISCLAIMER
//
// Copyright 2023 ArangoDB GmbH, Cologne, Germany
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
// Copyright holder is ArangoDB GmbH, Cologne, Germany
//
package md
import (
"bytes"
"fmt"
"os"
"strings"
"github.com/arangodb/kube-arangodb/pkg/util/errors"
)
func ReplaceSectionsInFile(path string, sections map[string]string) error {
data, err := os.ReadFile(path)
if err != nil {
return err
}
res, err := ReplaceSections(string(data), sections)
if err != nil {
return err
}
return os.WriteFile(path, []byte(res), 0644)
}
func ReplaceSections(in string, sections map[string]string) (string, error) {
for k, v := range sections {
if n, err := ReplaceSection(in, v, k); err != nil {
return "", err
} else {
in = n
}
}
return in, nil
}
func ReplaceSection(in, replace, section string) (string, error) {
start, end := fmt.Sprintf("\n[START_INJECT]: # (%s)\n", section), fmt.Sprintf("[END_INJECT]: # (%s)\n", section)
b := bytes.NewBuffer(nil)
for len(in) > 0 {
startID := strings.Index(in, start)
if startID == -1 {
b.WriteString(in)
in = ""
continue
}
b.WriteString(in[0:startID])
in = moveString(in, startID+len(start))
b.WriteString(start)
b.WriteString(replace)
endID := strings.Index(in, end)
if endID == -1 {
return "", errors.Newf("END_INJECT sections is missing for section %s. Note that newline is required at the end and before tag", section)
}
if strings.HasSuffix(replace, "\n\n") {
// if section ends with empty line, we don't need to write newline for END marker
end = strings.TrimLeft(end, "\n")
} else {
end = "\n" + end
}
b.WriteString(end)
in = moveString(in, endID+len(end))
}
return b.String(), nil
}
func moveString(in string, offset int) string {
if offset >= len(in) {
return ""
}
return in[offset:]
}