allow usage of multiple gopaths

.travis.yml

@@ -13,7 +13,7 @@ addons:
   postgresql: "9.4"
 
 env:
-  - DBNAME=kallax_test DBUSER=postgres DBPASS=''
+  - DBNAME=kallax_test DBUSER=postgres DBPASS='' GOPATH=/tmp/whatever:$GOPATH
 
 services:
   - postgresql

generator/processor.go

@@ -7,7 +7,6 @@ import (
 	"go/parser"
 	"go/token"
 	"go/types"
-	"os"
 	"path/filepath"
 	"reflect"
 	"strings"
@@ -459,16 +458,19 @@ func joinDirectory(directory string, files []string) []string {
 	return result
 }
 
-var goPath = os.Getenv("GOPATH")
-
 func typeName(typ types.Type) string {
 	return removeGoPath(typ.String())
 }
 
 func removeGoPath(path string) string {
-	importPath := filepath.ToSlash(goPath + "/src/")
 	path = filepath.ToSlash(path)
-	return strings.Replace(path, importPath, "", -1)
+	for _, p := range parseutil.DefaultGoPath {
+		p = filepath.ToSlash(p + "/src/")
+		if strings.HasPrefix(path, p) {
+			return strings.Replace(path, p, "", -1)
+		}
+	}
+	return path
 }
 
 func isIgnoredField(s *types.Struct, idx int) bool {

generator/processor_test.go

@@ -5,7 +5,6 @@ import (
 	"go/parser"
 	"go/token"
 	"go/types"
-	"path/filepath"
 	"reflect"
 	"testing"
 
@@ -340,7 +339,7 @@ func (s *ProcessorSuite) processFixture(source string) *Package {
 }
 
 func (s *ProcessorSuite) TestDo() {
-	p := NewProcessor(filepath.Join(goPath, "src", "gopkg.in/src-d/go-kallax.v1"), []string{"README.md"})
+	p := NewProcessor(pkgAbsPath, []string{"README.md"})
 	pkg, err := p.Do()
 	s.NotNil(pkg)
 	s.NoError(err)

generator/template.go

@@ -3,7 +3,6 @@ package generator
 import (
 	"bytes"
 	"fmt"
-	"go/build"
 	"go/types"
 	"io"
 	"os"
@@ -12,6 +11,8 @@ import (
 	"strings"
 	"text/template"
 
+	parseutil "gopkg.in/src-d/go-parse-utils.v1"
+
 	"golang.org/x/tools/imports"
 )
 
@@ -433,8 +434,18 @@ func printDocumentWithNumbers(code string) {
 	}
 }
 
+const pkgPath = "gopkg.in/src-d/go-kallax.v1/generator"
+
+var pkgAbsPath = func() string {
+	path, err := parseutil.DefaultGoPath.Abs(pkgPath)
+	if err != nil {
+		panic(err)
+	}
+	return path
+}()
+
 func loadTemplateText(filename string) string {
-	filename = filepath.Join(build.Default.GOPATH, "src/gopkg.in/src-d/go-kallax.v1/generator", filename)
+	filename = filepath.Join(pkgAbsPath, filename)
 	f, err := os.Open(filename)
 	if err != nil {
 		panic(err)
@@ -562,12 +573,12 @@ func writeFindByTpl(buf *bytes.Buffer, parent *Model, name string, f *Field, tpl
 // for the passed Field, in an autogenerated 'FindBy';
 // the second value returned is true if it was found a valid type
 func findableTypeName(f *Field) (string, bool) {
-	analycedType := f.Node.Type()
+	analyzedType := f.Node.Type()
 	collectionAlreadyScanned := false
 	for {
-		valid, deepest := lookupValid(f.Node.Pkg(), analycedType)
+		valid, deepest := lookupValid(f.Node.Pkg(), analyzedType)
 		if valid != nil {
-			return shortName(f.Node.Pkg(), analycedType), true
+			return shortName(f.Node.Pkg(), analyzedType), true
 		}
 
 		if collectionAlreadyScanned {
@@ -579,7 +590,7 @@ func findableTypeName(f *Field) (string, bool) {
 			break
 		}
 
-		analycedType = singular
+		analyzedType = singular
 		collectionAlreadyScanned = true
 	}
 
@@ -640,9 +651,7 @@ func isSpecialType(pkg *types.Package, typ types.Type) bool {
 }
 
 func specialTypeShortName(typ types.Type) (string, bool) {
-	s := removeGoPath(typ.String())
-	s = strings.Replace(s, "*", "", -1)
-	s = strings.Replace(s, "..", "", -1)
+	s := removeGoPath(strings.TrimLeft(typ.String(), "*."))
 	special, ok := specialTypes[s]
 	return special, ok
 }