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package main
import (
"flag"
"fmt"
"go/build"
"log"
"path/filepath"
"strings"
)
// Returns an array of strings containing only the filenames that should build
// according to the Context given.
func filterFilenames(bctx build.Context, inputs []string) ([]string, error) {
outputs := []string{}
for _, filename := range inputs {
fullPath, err := filepath.Abs(filename)
if err != nil {
return nil, err
}
dir, base := filepath.Split(fullPath)
matches, err := bctx.MatchFile(dir, base)
if err != nil {
return nil, err
}
if matches {
outputs = append(outputs, filename)
}
}
return outputs, nil
}
func main() {
cgo := flag.Bool("cgo", false, "Sets whether cgo-using files are allowed to pass the filter.")
tags := flag.String("tags", "", "Only pass through files that match these tags.")
flag.Parse()
bctx := build.Default
bctx.BuildTags = strings.Split(*tags, ",")
bctx.CgoEnabled = *cgo // Worth setting? build.MatchFile ignores this.
outputs, err := filterFilenames(bctx, flag.Args())
if err != nil {
log.Fatalf("build_tags error: %v\n", err)
}
fmt.Println(strings.Join(outputs, " "))
}
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