customize ldflags

closes ##5

README.md

@@ -57,6 +57,7 @@ repo: user/repo
 binary_name: my-binary
 build:
   main: ./cmd/main.go
+  ldflags: -s -w
   oses:
     - darwin
     - freebsd
@@ -64,7 +65,8 @@ build:
     - amd64
 ```
 
-> `oses` and `arches` should be in `GOOS`/`GOARCH`-compatible format.
+> - `oses` and `arches` should be in `GOOS`/`GOARCH`-compatible format.
+> - `-s -w` is the default value for `ldflags`.
 
 ### Archive customization
 
@@ -107,7 +109,7 @@ files:
 > By default GoReleaser adds the binary itself, `LICENCE*`, `LICENSE*`,
 `README*` and `CHANGELOG*`.
 
-### ldflags
+### ldflags (main.version)
 
 GoReleaser already sets a `main.version` ldflag, so, in you `main.go` program,
 you can:

config/config.go

@@ -22,9 +22,10 @@ type Homebrew struct {
 
 // BuildConfig contains the build configuration section
 type BuildConfig struct {
-	Oses   []string
-	Arches []string
-	Main   string
+	Oses    []string
+	Arches  []string
+	Main    string
+	Ldflags string
 }
 
 // GitInfo includes tags and diffs used in some point
@@ -107,6 +108,9 @@ func (config *ProjectConfig) fillBasicData() {
 	if len(config.Build.Arches) == 0 {
 		config.Build.Arches = []string{"amd64", "386"}
 	}
+	if config.Build.Ldflags == "" {
+		config.Build.Ldflags = "-s -w"
+	}
 	if config.Archive.NameTemplate == "" {
 		config.Archive.NameTemplate = "{{.BinaryName}}_{{.Os}}_{{.Arch}}"
 	}

pipeline/build/build.go

@@ -35,16 +35,19 @@ func (Pipe) Run(config config.ProjectConfig) error {
 }
 
 func build(system, arch string, config config.ProjectConfig) error {
-	log.Println("Building", system+"/"+arch, "...")
+	ldflags := config.Build.Ldflags + " -X main.version=" + config.Git.CurrentTag
 	name, err := config.ArchiveName(system, arch)
 	if err != nil {
 		return err
 	}
+	output := "dist/" + name + "/" + config.BinaryName
+	log.Println("Building", output, "...")
+	log.Println("'" + ldflags + "'")
 	cmd := exec.Command(
 		"go",
 		"build",
-		"-ldflags=-s -w -X main.version="+config.Git.CurrentTag,
-		"-o", "dist/"+name+"/"+config.BinaryName,
+		"-ldflags="+ldflags,
+		"-o", output,
 		config.Build.Main,
 	)
 	cmd.Env = append(