github.com/bazelbuild/rules_webtesting@v0.2.0/go/metadata/main/merger.go (about)

     1  // Copyright 2016 Google Inc.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //      http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  // Binary merger takes multiple metadata files and merges them to produce a single
    16  // metadata file.
    17  package main
    18  
    19  import (
    20  	"flag"
    21  	"log"
    22  
    23  	"github.com/bazelbuild/rules_webtesting/go/metadata"
    24  )
    25  
    26  var output = flag.String("output", "", "output file for generated metadata")
    27  
    28  func main() {
    29  	flag.Parse()
    30  
    31  	data := &metadata.Metadata{}
    32  
    33  	for _, file := range flag.Args() {
    34  		m, err := metadata.FromFile(file, nil)
    35  		if err != nil {
    36  			log.Fatalf("Error reading %q: %v", file, err)
    37  		}
    38  		data, err = metadata.Merge(data, m)
    39  		if err != nil {
    40  			log.Fatalf("Error merging file %q: %v", file, err)
    41  		}
    42  	}
    43  
    44  	if err := data.ToFile(*output); err != nil {
    45  		log.Fatalf("Error writing %s: %v", *output, err)
    46  	}
    47  }