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79 lines
1.9 KiB
79 lines
1.9 KiB
// Copyright 2013 Google, Inc. All rights reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package main
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import (
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"flag"
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"fmt"
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"log"
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"os"
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)
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import "github.com/kylelemons/go-gypsy/yaml"
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var (
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file = flag.String("file", "config.yaml", "(Simple) YAML file to read")
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)
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func main() {
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cmd := os.Args[0]
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flag.Usage = func() {
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fmt.Println(`Usage:`, cmd, `[<options>] [<param> ...]
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All <param>s given on the commandline are looked up in
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the config file "config.yaml" (or whatever is specified for -file).
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Examples:
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$`, cmd, `mapping.key1 # = value1
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Get the key1 element of the "mapping" mapping
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$`, cmd, `config.server[1]
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Get the second (1th) element of the "server" list inside the "config" mapping
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$`, cmd, `mapping mapping.key1 config config.server config.admin[1].password
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Retrieve a bunch of options. With the example yaml file, some of these
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options are errors, which will print the (text of the) actual Go error from
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node.Get
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Options:`)
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flag.PrintDefaults()
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}
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flag.Parse()
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config, err := yaml.ReadFile(*file)
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if err != nil {
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log.Fatalf("readfile(%q): %s", *file, err)
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}
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params := flag.Args()
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width := 0
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for _, param := range params {
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if w := len(param); w > width {
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width = w
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}
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}
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for _, param := range params {
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val, err := config.Get(param)
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if err != nil {
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fmt.Printf("%-*s = %s\n", width, param, err)
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continue
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}
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fmt.Printf("%-*s = %q\n", width, param, val)
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}
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}
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