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// Copyright 2013 Canonical Ltd.
// Licensed under the LGPLv3, see LICENCE file for details.
package testing
import (
"fmt"
"go/build"
"path/filepath"
"sort"
"strings"
)
// stdlib repesents the packages that belong to the standard library.
var stdlib = map[string]bool{
"C": true, // not really a package
"archive/tar": true,
"archive/zip": true,
"bufio": true,
"bytes": true,
"compress/bzip2": true,
"compress/flate": true,
"compress/gzip": true,
"compress/lzw": true,
"compress/zlib": true,
"container/heap": true,
"container/list": true,
"container/ring": true,
"crypto": true,
"crypto/aes": true,
"crypto/cipher": true,
"crypto/des": true,
"crypto/dsa": true,
"crypto/ecdsa": true,
"crypto/elliptic": true,
"crypto/hmac": true,
"crypto/md5": true,
"crypto/rand": true,
"crypto/rc4": true,
"crypto/rsa": true,
"crypto/sha1": true,
"crypto/sha256": true,
"crypto/sha512": true,
"crypto/subtle": true,
"crypto/tls": true,
"crypto/x509": true,
"crypto/x509/pkix": true,
"database/sql": true,
"database/sql/driver": true,
"debug/dwarf": true,
"debug/elf": true,
"debug/goobj": true,
"debug/gosym": true,
"debug/macho": true,
"debug/pe": true,
"debug/plan9obj": true,
"encoding": true,
"encoding/ascii85": true,
"encoding/asn1": true,
"encoding/base32": true,
"encoding/base64": true,
"encoding/binary": true,
"encoding/csv": true,
"encoding/gob": true,
"encoding/hex": true,
"encoding/json": true,
"encoding/pem": true,
"encoding/xml": true,
"errors": true,
"expvar": true,
"flag": true,
"fmt": true,
"go/ast": true,
"go/build": true,
"go/doc": true,
"go/format": true,
"go/parser": true,
"go/printer": true,
"go/scanner": true,
"go/token": true,
"hash": true,
"hash/adler32": true,
"hash/crc32": true,
"hash/crc64": true,
"hash/fnv": true,
"html": true,
"html/template": true,
"image": true,
"image/color": true,
"image/color/palette": true,
"image/draw": true,
"image/gif": true,
"image/jpeg": true,
"image/png": true,
"index/suffixarray": true,
"io": true,
"io/ioutil": true,
"log": true,
"log/syslog": true,
"math": true,
"math/big": true,
"math/cmplx": true,
"math/rand": true,
"mime": true,
"mime/multipart": true,
"net": true,
"net/http": true,
"net/http/cgi": true,
"net/http/cookiejar": true,
"net/http/fcgi": true,
"net/http/httptest": true,
"net/http/httputil": true,
"net/http/pprof": true,
"net/mail": true,
"net/rpc": true,
"net/rpc/jsonrpc": true,
"net/smtp": true,
"net/textproto": true,
"net/url": true,
"os": true,
"os/exec": true,
"os/signal": true,
"os/user": true,
"path": true,
"path/filepath": true,
"reflect": true,
"regexp": true,
"regexp/syntax": true,
"runtime": true,
"runtime/cgo": true,
"runtime/debug": true,
"runtime/pprof": true,
"runtime/race": true,
"sort": true,
"strconv": true,
"strings": true,
"sync": true,
"sync/atomic": true,
"syscall": true,
"testing": true,
"testing/iotest": true,
"testing/quick": true,
"text/scanner": true,
"text/tabwriter": true,
"text/template": true,
"text/template/parse": true,
"time": true,
"unicode": true,
"unicode/utf16": true,
"unicode/utf8": true,
"unsafe": true,
}
// FindImports returns a sorted list of packages imported by the package
// with the given name that have the given prefix. The resulting list
// removes the common prefix, leaving just the short names.
func FindImports(packageName, prefix string) ([]string, error) {
allPkgs := make(map[string]bool)
if err := findImports(packageName, allPkgs, findProjectDir(prefix)); err != nil {
return nil, err
}
var result []string
for name := range allPkgs {
if strings.HasPrefix(name, prefix) {
result = append(result, name[len(prefix):])
}
}
sort.Strings(result)
return result, nil
}
func findProjectDir(projectPath string) string {
return filepath.Join(build.Default.GOPATH, "src", projectPath)
}
// findImports recursively adds all imported packages of given
// package (packageName) to allPkgs map.
func findImports(packageName string, allPkgs map[string]bool, srcDir string) error {
// skip packages defined in the standard library.
if stdlib[packageName] {
return nil
}
pkg, err := build.Default.Import(packageName, srcDir, 0)
if err != nil {
return fmt.Errorf("cannot find %q: %v", packageName, err)
}
for _, name := range pkg.Imports {
if !allPkgs[name] {
allPkgs[name] = true
if err := findImports(name, allPkgs, srcDir); err != nil {
return err
}
}
}
return nil
}
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