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// showimp is a utility for displaying the imports in a package.
package main
import (
"flag"
"fmt"
"go/parser"
"go/token"
"os"
"path/filepath"
"regexp"
"sort"
"strings"
"github.com/kisom/goutils/die"
"github.com/kisom/goutils/logging"
)
var (
gopath string
project string
debug bool
)
var (
stdLibRegexp = regexp.MustCompile(`^\w+(/\w+)*$`)
sourceRegexp = regexp.MustCompile(`^[^.].*\.go$`)
log = logging.NewConsole()
imports = map[string]bool{}
fset = &token.FileSet{}
)
func debugf(format string, args ...interface{}) {
if debug {
fmt.Printf(format, args...)
}
}
func debugln(args ...interface{}) {
if debug {
fmt.Println(args...)
}
}
func init() {
gopath = os.Getenv("GOPATH")
if gopath == "" {
fmt.Fprintf(os.Stderr, "GOPATH isn't set, can't proceed.")
os.Exit(1)
}
gopath += "/src/"
wd, err := os.Getwd()
if err != nil {
fmt.Fprintf(os.Stderr, "Unable to establish working directory: %v", err)
os.Exit(1)
}
if !strings.HasPrefix(wd, gopath) {
fmt.Fprintf(os.Stderr, "Can't determine my location in the GOPATH.\n")
fmt.Fprintf(os.Stderr, "Working directory is %s\n", wd)
fmt.Fprintf(os.Stderr, "Go source path is %s\n", gopath)
os.Exit(1)
}
project = wd[len(gopath):]
}
func walkFile(path string, info os.FileInfo, err error) error {
if !sourceRegexp.MatchString(path) {
return nil
}
debugln(path)
f, err := parser.ParseFile(fset, path, nil, parser.ImportsOnly)
if err != nil {
return err
}
for _, importSpec := range f.Imports {
importPath := strings.Trim(importSpec.Path.Value, `"`)
if stdLibRegexp.MatchString(importPath) {
debugln("standard lib:", importPath)
continue
} else if strings.HasPrefix(importPath, project) {
debugln("internal import:", importPath)
continue
} else if strings.HasPrefix(importPath, "golang.org/") {
debugln("extended lib:", importPath)
continue
}
debugln("import:", importPath)
imports[importPath] = true
}
return nil
}
func main() {
flag.BoolVar(&debug, "v", false, "log debugging information")
flag.Parse()
err := filepath.Walk(".", walkFile)
die.If(err)
fmt.Println("External imports:")
importList := make([]string, 0, len(imports))
for imp := range imports {
importList = append(importList, imp)
}
sort.Strings(importList)
for _, imp := range importList {
fmt.Println("\t", imp)
}
}
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