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buildtags.go
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buildtags.go
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package main
import (
"flag"
"fmt"
"go/build"
"go/parser"
"go/token"
"io/ioutil"
"os"
"path/filepath"
"strings"
)
var (
srcDir string
pkgDir = flag.String("pkg_dir", ".", "package working dir")
basePkg = flag.String("pkgs", "htc.com/csi", "package to build tags")
)
type importFile struct {
file string
srcFile string
}
func init() {
if build.Default.GOPATH == "" {
panic("$GOPATH is empty")
}
for _, dir := range build.Default.SrcDirs() {
if _, err := os.Stat(filepath.Join(dir, *basePkg)); err == nil {
srcDir = dir
break
}
}
if srcDir == "" {
panic(fmt.Sprintf("unable to find source dir for %s", *basePkg))
}
}
// get imports belonged to htc.com for a file.
func getImports(filepath string) ([]string, error) {
// Parse the file containing this very example
// but stop after processing the imports.
f, err := parser.ParseFile(token.NewFileSet(), filepath, nil, parser.ImportsOnly)
if err != nil {
return nil, err
}
// Print the imports from the file's AST.
result := []string{}
for _, s := range f.Imports {
v := s.Path.Value
if strings.HasPrefix(v, `"`+*basePkg) {
result = append(result, v[1:len(v)-1])
}
}
return result, nil
}
func pkgToPath(pkg string) string {
return filepath.Join(srcDir, pkg)
}
// TODO: perform real merge, but how ?!
func mergeTags(tags []string) string {
return strings.Join(tags, " ")
}
func main() {
flag.Parse()
wdir, err := filepath.Abs(*pkgDir)
if err != nil {
panic(fmt.Sprintf("unable to get package dir of %v err:%v", wdir, err))
}
pkgStae, err := os.Stat(wdir)
if err != nil {
panic(fmt.Sprintf("unable to get dir info of %v err:%v", wdir, err))
}
if !pkgStae.IsDir() {
panic(fmt.Sprintf("%v is not a dir", wdir))
}
tags := []string{}
seentags := map[string]bool{}
touched := map[string]bool{}
queue := []importFile{importFile{file: wdir}}
for len(queue) > 0 {
dirname := queue[0]
queue = queue[1:]
// handle diamond shape cases.
if touched[dirname.file] {
continue
}
touched[dirname.file] = true
infos, err := ioutil.ReadDir(dirname.file)
if err != nil {
panic(fmt.Sprintf("unable to read package %v imported from %v, err:%v",
dirname.file, dirname.srcFile, err))
}
for _, info := range infos {
if info.IsDir() {
continue
}
// it go file.
name := info.Name()
path := filepath.Join(dirname.file, name)
if strings.HasSuffix(name, ".go") {
// get imports of a go file.
imports, err := getImports(path)
if err != nil {
panic(fmt.Sprintf("unable to parse imports from %v err:%v", path, err))
}
for _, imp := range imports {
queue = append(queue, importFile{file: pkgToPath(imp), srcFile: path})
}
} else if name == "go_tags" && !info.IsDir() {
// read go tags content.
tag, err := ioutil.ReadFile(path)
if err != nil {
panic(fmt.Sprintf("unable to read go_tags from %v err:%v", path, err))
}
stag := strings.Replace(string(tag), "\n", "", -1)
_, seen := seentags[stag]
if !seen {
seentags[stag] = true
tags = append(tags, stag)
}
}
}
}
fmt.Print(mergeTags(tags))
}