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sample.go
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sample.go
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// Copyright 2019 Anapaya Systems
//
// 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 config
import (
"bufio"
"bytes"
"fmt"
"io"
"strings"
)
// CtxMap contains the context for sample generation.
type CtxMap map[string]string
// WriteSample writes all sample config blocks in order of appearance with
// indentation and header to dst.
func WriteSample(dst io.Writer, path Path, ctx CtxMap, samplers ...Sampler) {
var buf bytes.Buffer
for _, sampler := range samplers {
p := path.Extend(sampler.ConfigName())
writeHeader(dst, p)
sampler.Sample(&buf, p, ctx)
writeWithIndent(dst, &buf)
buf.Reset()
}
}
// WriteString writes the string to dst. It panics if an error occurs.
func WriteString(dst io.Writer, s string) {
_, err := dst.Write([]byte(s))
if err != nil {
panic(fmt.Sprintf("Unable to write string err=%s", err))
}
}
// writeWithIndent writes the contents of src indented to dst.
func writeWithIndent(dst io.Writer, src io.Reader) {
scanner := bufio.NewScanner(src)
for scanner.Scan() {
if len(scanner.Text()) > 0 {
fmt.Fprintf(dst, " %s\n", scanner.Text())
} else {
fmt.Fprintln(dst)
}
}
}
// writeHeader creates a header from path and writes it to dst.
func writeHeader(dst io.Writer, path Path) {
WriteString(dst, fmt.Sprintf("\n[%s]", strings.Join(path, ".")))
}