feat(brew): post_install (#1790)

Signed-off-by: Carlos Alexandro Becker <caarlos0@gmail.com>

Co-authored-by: Grachev Mikhail <work@mgrachev.com>

internal/pipe/brew/brew.go

@@ -261,6 +261,7 @@ func dataFor(ctx *context.Context, cfg config.Homebrew, cl client.Client, artifa
 		Conflicts:        cfg.Conflicts,
 		Plist:            cfg.Plist,
 		Install:          split(cfg.Install),
+		PostInstall:      cfg.PostInstall,
 		Tests:            split(cfg.Test),
 		DownloadStrategy: cfg.DownloadStrategy,
 		CustomRequire:    cfg.CustomRequire,

internal/pipe/brew/brew_test.go

@@ -77,6 +77,7 @@ func TestFullFormulae(t *testing.T) {
 	data.Dependencies = []config.HomebrewDependency{{Name: "gtk+"}}
 	data.Conflicts = []string{"svn"}
 	data.Plist = "it works"
+	data.PostInstall = `system "touch", "/tmp/foo"`
 	data.CustomBlock = []string{"devel do", `  url "https://github.com/caarlos0/test/releases/download/v0.1.3/test_Darwin_x86_64.tar.gz"`, `  sha256 "1633f61598ab0791e213135923624eb342196b3494909c91899bcd0560f84c68"`, "end"}
 	data.Install = []string{"custom install script", "another install script"}
 	data.Tests = []string{`system "#{bin}/{{.ProjectName}} -version"`}

internal/pipe/brew/template.go

@@ -11,6 +11,7 @@ type templateData struct {
 	Plist            string
 	DownloadStrategy string
 	Install          []string
+	PostInstall      string
 	Dependencies     []config.HomebrewDependency
 	Conflicts        []string
 	Tests            []string
@@ -95,6 +96,13 @@ class {{ .Name }} < Formula
     {{- end }}
   end
 
+  {{- with .PostInstall }}
+
+  def post_install
+    {{ . }}
+  end
+  {{- end -}}
+
   {{- with .Caveats }}
 
   def caveats; <<~EOS

internal/pipe/brew/testdata/test.rb.golden

@@ -38,6 +38,10 @@ class Test < Formula
     another install script
   end
 
+  def post_install
+    system "touch", "/tmp/foo"
+  end
+
   def caveats; <<~EOS
     Here are some caveats
   EOS

pkg/config/config.go

@@ -95,6 +95,7 @@ type Homebrew struct {
 	Caveats          string               `yaml:",omitempty"`
 	Plist            string               `yaml:",omitempty"`
 	Install          string               `yaml:",omitempty"`
+	PostInstall      string               `yaml:"post_install,omitempty"`
 	Dependencies     []HomebrewDependency `yaml:",omitempty"`
 	Test             string               `yaml:",omitempty"`
 	Conflicts        []string             `yaml:",omitempty"`