fix: re-added .Binary to supported fields

Also added a deprecation warning and tests,

Closes #476

internal/nametemplate/name.go

@@ -2,15 +2,22 @@ package nametemplate
 
 import (
 	"bytes"
+	"regexp"
 	"text/template"
 
+	"github.com/apex/log"
 	"github.com/goreleaser/goreleaser/context"
 	"github.com/goreleaser/goreleaser/internal/artifact"
 )
 
+var deprecatedBinary = regexp.MustCompile("\\{\\{ ?\\.Binary ?\\}\\}")
+
 // Apply applies the name template to the given artifact and name
 // TODO: this should be refactored alongside with other name template related todos
 func Apply(ctx *context.Context, a artifact.Artifact, name string) (string, error) {
+	if deprecatedBinary.MatchString(ctx.Config.Archive.NameTemplate) {
+		log.WithField("field", "{{.Binary}}").Warn("you are using a deprecated field on your template, please check the documentation")
+	}
 	var out bytes.Buffer
 	t, err := template.New("archive_name").Parse(ctx.Config.Archive.NameTemplate)
 	if err != nil {
@@ -26,6 +33,7 @@ func Apply(ctx *context.Context, a artifact.Artifact, name string) (string, erro
 		Version:     ctx.Version,
 		Tag:         ctx.Git.CurrentTag,
 		ProjectName: name,
+		Binary:      name, // TODO: deprecated, remove soon
 		Env:         ctx.Env,
 	}
 	err = t.Execute(&out, data)

internal/nametemplate/name_test.go

@@ -0,0 +1,52 @@
+package nametemplate
+
+import (
+	"testing"
+
+	"github.com/goreleaser/goreleaser/config"
+	"github.com/goreleaser/goreleaser/context"
+	"github.com/goreleaser/goreleaser/internal/artifact"
+	"github.com/tj/assert"
+)
+
+func TestNameTemplate(t *testing.T) {
+	var ctx = context.New(config.Project{
+		ProjectName: "proj",
+		Archive: config.Archive{
+			NameTemplate: "{{.Binary}}_{{.ProjectName}}_{{ .Os }}_{{ .Arch }}{{ if .Arm }}v{{ .Arm }}{{ end }}",
+			Replacements: map[string]string{
+				"windows": "windao",
+			},
+		},
+	})
+	s, err := Apply(ctx, artifact.Artifact{
+		Goos:   "windows",
+		Goarch: "amd64",
+		Name:   "winbin",
+	}, "bin")
+	assert.NoError(t, err)
+	assert.Equal(t, "bin_bin_windao_amd64", s)
+	s, err = Apply(ctx, artifact.Artifact{
+		Goos:   "darwin",
+		Goarch: "amd64",
+		Name:   "winbin",
+	}, "bin")
+	assert.NoError(t, err)
+	assert.Equal(t, "bin_bin_darwin_amd64", s)
+}
+
+func TestInvalidNameTemplate(t *testing.T) {
+	var ctx = context.New(config.Project{
+		ProjectName: "proj",
+		Archive: config.Archive{
+			NameTemplate: "{{.Binary}",
+		},
+	})
+	s, err := Apply(ctx, artifact.Artifact{
+		Goos:   "windows",
+		Goarch: "amd64",
+		Name:   "winbin",
+	}, "bin")
+	assert.EqualError(t, err, `template: archive_name:1: unexpected "}" in operand`)
+	assert.Empty(t, s)
+}