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format.go
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format.go
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/*
Copyright 2023 The pdfcpu Authors.
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.
*/
package format
import (
"strconv"
"time"
"github.com/pdfcpu/pdfcpu/pkg/pdfcpu/model"
)
// Text returns a string with resolved place holders for pageNr, pageCount, timestamp or pdfcpu version.
func Text(text, timeStampFormat string, pageNr, pageCount int) (string, bool) {
// replace %p with pageNr
// %P with pageCount
// %t with timestamp
// %v with pdfcpu version
var (
bb []byte
hasPercent bool
unique bool
)
for i := 0; i < len(text); i++ {
if text[i] == '%' {
if hasPercent {
bb = append(bb, '%')
}
hasPercent = true
continue
}
if hasPercent {
hasPercent = false
if text[i] == 'p' {
bb = append(bb, strconv.Itoa(pageNr)...)
unique = true
continue
}
if text[i] == 'P' {
bb = append(bb, strconv.Itoa(pageCount)...)
unique = true
continue
}
if text[i] == 't' {
bb = append(bb, time.Now().Format(timeStampFormat)...)
unique = true
continue
}
if text[i] == 'v' {
bb = append(bb, model.VersionStr...)
unique = true
continue
}
}
bb = append(bb, text[i])
}
return string(bb), unique
}