generate a version file

cmd/init.go

@@ -55,7 +55,7 @@ func init() {
 	initCmd.Flags().BoolVarP(&initOptions.dryRun, "dry-run", "d", false, "runs the generator dry")
 	initCmd.Flags().BoolVarP(&initOptions.force, "force", "f", false, "force files to overwrite existing ones")
 	initCmd.Flags().StringVarP(&initOptions.mainFile, "main-file", "m", "", "adds a .goreleaser.yml file (only for binary applications)")
-	initCmd.Flags().StringVarP(&initOptions.versionFile, "version-file", "v", "", "path to a version file to maintain")
+	initCmd.Flags().StringVarP(&initOptions.versionFile, "version-file", "v", "version.go", "path to a version file to maintain")
 
 	// Here you will define your flags and configuration settings.
 

genny/makefile/options.go

@@ -7,5 +7,8 @@ type Options struct {
 
 // Validate that options are usuable
 func (opts *Options) Validate() error {
+	if len(opts.VersionFile) == 0 {
+		opts.VersionFile = "version.go"
+	}
 	return nil
 }

genny/release/version_file.go

@@ -2,10 +2,16 @@ package release
 
 import (
 	"bytes"
+	"io/ioutil"
+	"os"
+	"path/filepath"
 	"regexp"
 	"strings"
 
 	"github.com/gobuffalo/genny"
+	"github.com/gobuffalo/genny/movinglater/gotools"
+	"github.com/gobuffalo/genny/movinglater/plushgen"
+	"github.com/gobuffalo/plush"
 	"github.com/pkg/errors"
 )
 
@@ -16,7 +22,10 @@ func writeVersionFile(opts *Options) genny.RunFn {
 
 		f, err := r.FindFile(opts.VersionFile)
 		if err != nil {
-			return errors.WithStack(err)
+			f, err = defaultVersionFile(opts.VersionFile)
+			if err != nil {
+				return errors.WithStack(err)
+			}
 		}
 
 		var matches []string
@@ -43,3 +52,51 @@ func writeVersionFile(opts *Options) genny.RunFn {
 		return r.File(f)
 	}
 }
+
+func defaultVersionFile(name string) (genny.File, error) {
+	dir := filepath.Dir(name)
+	files, err := ioutil.ReadDir(dir)
+	_, ok := err.(*os.PathError)
+	if err != nil && !ok {
+		return nil, errors.WithStack(err)
+	}
+	var pkg string
+	if len(files) == 0 {
+		pkg = filepath.Base(dir)
+	} else {
+		for _, fi := range files {
+			ext := filepath.Ext(fi.Name())
+			if ext != ".go" {
+				continue
+			}
+			if strings.HasSuffix(fi.Name(), "_test.go") {
+				continue
+			}
+			b, err := ioutil.ReadFile(fi.Name())
+			if err != nil {
+				return nil, errors.WithStack(err)
+			}
+			xf := genny.NewFile(fi.Name(), bytes.NewReader(b))
+			pkg, err = gotools.PackageName(xf)
+			if err != nil {
+				return nil, errors.WithStack(err)
+			}
+			break
+		}
+	}
+
+	f := genny.NewFile(name+".plush", strings.NewReader(versionTmpl))
+
+	ctx := plush.NewContext()
+	ctx.Set("pkg", pkg)
+	t := plushgen.Transformer(ctx)
+	f, err = t.Transform(f)
+	if err != nil {
+		return f, errors.WithStack(err)
+	}
+	return f, nil
+}
+
+const versionTmpl = `package <%= pkg %>
+
+const Version = ""`

genny/release/version_file_test.go

@@ -0,0 +1,45 @@
+package release
+
+import (
+	"context"
+	"testing"
+
+	"github.com/gobuffalo/genny"
+	"github.com/stretchr/testify/require"
+)
+
+func Test_writeVersionFile(t *testing.T) {
+
+	table := []struct {
+		vf  string
+		pkg string
+	}{
+		{"foo/version.go", "foo"},
+		{"version.go", "release"},
+	}
+
+	for _, tt := range table {
+		t.Run(tt.vf, func(st *testing.T) {
+			r := require.New(st)
+
+			opts := &Options{
+				VersionFile: tt.vf,
+			}
+
+			run := genny.DryRunner(context.Background())
+
+			fn := writeVersionFile(opts)
+			r.NoError(fn(run))
+
+			res := run.Results()
+
+			r.Len(res.Commands, 0)
+			r.Len(res.Files, 1)
+
+			f := res.Files[0]
+			r.Equal(opts.VersionFile, f.Name())
+			r.Contains(f.String(), "package "+tt.pkg)
+		})
+	}
+
+}

go.mod

@@ -3,12 +3,11 @@ module github.com/gobuffalo/release
 require (
 	github.com/Masterminds/semver v1.4.2
 	github.com/gobuffalo/envy v1.6.4
-	github.com/gobuffalo/genny v0.0.0-20180904214332-b7dcbfc7ea0a
+	github.com/gobuffalo/genny v0.0.0-20180905180744-ca4140706556
 	github.com/gobuffalo/packr v1.13.3
 	github.com/gobuffalo/plush v3.7.16+incompatible
 	github.com/gobuffalo/shoulders v0.0.0-20180904151418-9cac5899ceee
 	github.com/pkg/errors v0.8.0
 	github.com/spf13/cobra v0.0.3
 	github.com/stretchr/testify v1.2.2
-	golang.org/x/sys v0.0.0-20180905080454-ebe1bf3edb33 // indirect
 )

go.sum

@@ -10,8 +10,8 @@ github.com/fsnotify/fsnotify v1.4.7/go.mod h1:jwhsz4b93w/PPRr/qN1Yymfu8t87LnFCMo
 github.com/gobuffalo/envy v1.6.4 h1:kxamN+VYjPMzEdjc2mn4CIKiuYXGxc8VIwXJNixFlNY=
 github.com/gobuffalo/envy v1.6.4/go.mod h1:Abh+Jfw475/NWtYMEt+hnJWRiC8INKWibIMyNt1w2Mc=
 github.com/gobuffalo/flect v0.0.0-20180902163941-e03d6ccf1b21/go.mod h1:rCiQgmAE4axgBNl3jZWzS5rETRYTGOsrixTRaCPzNdA=
-github.com/gobuffalo/genny v0.0.0-20180904214332-b7dcbfc7ea0a h1:LozjeWkCQ2gCbSGtXyGNuWVfjlDTHv3yT+XkImvXyIg=
-github.com/gobuffalo/genny v0.0.0-20180904214332-b7dcbfc7ea0a/go.mod h1:CX+ymPzTO0Ti5qRyCFdtu78AncVEQ5QVe5cEeqMURJs=
+github.com/gobuffalo/genny v0.0.0-20180905180744-ca4140706556 h1:/ZTXnwIn9IYobWzKwrsDxiPEdwD6+W/F62lRBlG41Wg=
+github.com/gobuffalo/genny v0.0.0-20180905180744-ca4140706556/go.mod h1:FZNXcfF+FuV4i8BANht5bghYawahu+sIrDdES9govgw=
 github.com/gobuffalo/github_flavored_markdown v1.0.0 h1:e2dK+SoHgOc/vfXuYMdXwEg2vAUlFzp8SBRwTOXckQ0=
 github.com/gobuffalo/github_flavored_markdown v1.0.0/go.mod h1:c8/8gRnd6MSyyk+fp6E8O8cUTHd7P2cnDnH4G7o91l0=
 github.com/gobuffalo/packr v1.13.3 h1:XjxS2G7cI2kb1KtGwO+ziCdB/D0kAuU/eG3BAieQT+4=
@@ -91,8 +91,6 @@ golang.org/x/net v0.0.0-20180826012351-8a410e7b638d h1:g9qWBGx4puODJTMVyoPrpoxPF
 golang.org/x/net v0.0.0-20180826012351-8a410e7b638d/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
 golang.org/x/sync v0.0.0-20180314180146-1d60e4601c6f h1:wMNYb4v58l5UBM7MYRLPG6ZhfOqbKu7X5eyFl8ZhKvA=
 golang.org/x/sync v0.0.0-20180314180146-1d60e4601c6f/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
-golang.org/x/sys v0.0.0-20180903190138-2b024373dcd9 h1:lkiLiLBHGoH3XnqSLUIaBsilGMUjI+Uy2Xu2JLUtTas=
-golang.org/x/sys v0.0.0-20180903190138-2b024373dcd9/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20180905080454-ebe1bf3edb33 h1:I6FyU15t786LL7oL/hn43zqTuEGr4PN7F4XJ1p4E3Y8=
 golang.org/x/sys v0.0.0-20180905080454-ebe1bf3edb33/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/text v0.3.0 h1:g61tztE5qeGQ89tm6NTjjM9VPIm088od1l6aSorWRWg=