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mergeindex.go
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mergeindex.go
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package main
import (
"bufio"
"flag"
"fmt"
"log"
"os"
"path/filepath"
"strings"
jipb "github.com/stackb/scala-gazelle/build/stack/gazelle/scala/jarindex"
"github.com/stackb/scala-gazelle/pkg/jarindex"
"github.com/stackb/scala-gazelle/pkg/protobuf"
)
const debug = false
var (
outputFile string
predefinedLabels string
)
func main() {
log.SetPrefix("mergeindex: ")
log.SetFlags(0) // don't print timestamps
args := os.Args[1:]
if len(args) == 1 && strings.HasPrefix(args[0], "@") {
paramsFile := args[0][1:]
var err error
args, err = readParamsFile(paramsFile)
if err != nil {
log.Fatalln("failed to read params file:", paramsFile, err)
}
}
files, err := parseFlags(args)
if err != nil {
log.Fatal(err)
}
index, err := merge(files...)
if err != nil {
log.Fatal(err)
}
if err := protobuf.WriteFile(outputFile, index); err != nil {
log.Fatal(err)
}
}
func readParamsFile(filename string) ([]string, error) {
params := []string{}
f, err := os.Open(filename)
if err != nil {
return nil, err
}
defer f.Close()
scanner := bufio.NewScanner(f)
for scanner.Scan() {
line := strings.TrimSpace(scanner.Text())
if line == "" {
continue
}
params = append(params, line)
}
if err := scanner.Err(); err != nil {
return nil, err
}
return params, nil
}
func parseFlags(args []string) (files []string, err error) {
fs := flag.NewFlagSet("mergeindex", flag.ExitOnError) // flag.ContinueOnError
fs.StringVar(&predefinedLabels, "predefined", "", "a comma-separated list of labels to be considered predefined")
fs.StringVar(&outputFile, "output_file", "", "the output file to write")
fs.Usage = func() {
fmt.Fprintf(flag.CommandLine.Output(), "usage: mergeindex @PARAMS_FILE | mergeindex OPTIONS FILES")
fs.PrintDefaults()
}
if err = fs.Parse(args); err != nil {
return
}
if outputFile == "" {
log.Fatal("-output_file is required")
}
files = fs.Args()
if len(files) == 0 {
err = fmt.Errorf("mergeindex positional args should be a non-empty list of jarindex.{pb|json} files to merge")
}
return
}
func merge(filenames ...string) (*jipb.JarIndex, error) {
jars := make([]*jipb.JarFile, 0, len(filenames))
for _, filename := range filenames {
idx := jipb.JarIndex{}
if err := protobuf.ReadFile(filename, &idx); err != nil {
return nil, fmt.Errorf("reading jarindex file %q: %w", filename, err)
}
jars = append(jars, idx.JarFile...)
if debug {
if err := writeJarIndexJarFileJSONFiles(&idx); err != nil {
return nil, err
}
}
}
var predefined []string
if predefinedLabels != "" {
predefined = strings.Split(predefinedLabels, ",")
}
index, err := jarindex.MergeJarFiles(func(format string, args ...interface{}) {
log.Printf("warning: "+format, args...)
}, predefined, jars)
if err != nil {
return nil, err
}
index.Predefined = predefined
return index, nil
}
func writeJarIndexJarFileJSONFiles(idx *jipb.JarIndex) error {
for _, file := range idx.JarFile {
if err := writeJarFileJSONFile(file); err != nil {
return err
}
}
return nil
}
func writeJarFileJSONFile(file *jipb.JarFile) error {
jarFilename := "/tmp/" + filepath.Base(file.Filename) + ".json"
if err := protobuf.WriteFile(jarFilename, file); err != nil {
return err
}
log.Println("Wrote:", jarFilename)
return nil
}