feat: IsDraft template variable (#3888)

allows to use `{{ .IsDraft }}` in templates.

---------

Signed-off-by: Carlos A Becker <caarlos0@users.noreply.github.com>

internal/tmpl/tmpl.go

@@ -50,6 +50,7 @@ const (
 	patch           = "Patch"
 	prerelease      = "Prerelease"
 	isSnapshot      = "IsSnapshot"
+	isDraft         = "IsDraft"
 	env             = "Env"
 	date            = "Date"
 	now             = "Now"
@@ -106,6 +107,7 @@ func New(ctx *context.Context) *Template {
 		patch:           ctx.Semver.Patch,
 		prerelease:      ctx.Semver.Prerelease,
 		isSnapshot:      ctx.Snapshot,
+		isDraft:         ctx.Config.Release.Draft,
 		releaseNotes:    ctx.ReleaseNotes,
 		releaseURL:      ctx.ReleaseURL,
 		tagSubject:      ctx.Git.TagSubject,

internal/tmpl/tmpl_test.go

@@ -18,7 +18,12 @@ import (
 func TestWithArtifact(t *testing.T) {
 	t.Parallel()
 	ctx := testctx.NewWithCfg(
-		config.Project{ProjectName: "proj"},
+		config.Project{
+			ProjectName: "proj",
+			Release: config.Release{
+				Draft: true,
+			},
+		},
 		testctx.WithVersion("1.2.3"),
 		testctx.WithGitInfo(context.GitInfo{
 			PreviousTag: "v1.2.2",
@@ -36,6 +41,7 @@ func TestWithArtifact(t *testing.T) {
 			"MULTILINE": "something with\nmultiple lines\nremove this\nto test things",
 		}),
 		testctx.WithSemver(1, 2, 3, ""),
+		testctx.Snapshot,
 		func(ctx *context.Context) {
 			ctx.ModulePath = "github.com/goreleaser/goreleaser"
 			ctx.ReleaseNotes = "test release notes"
@@ -80,6 +86,8 @@ func TestWithArtifact(t *testing.T) {
 		"2023":                             `{{ .Now.Format "2006" }}`,
 		"2023-03-09T02:06:02Z":             `{{ .Date }}`,
 		"1678327562":                       `{{ .Timestamp }}`,
+		"snapshot true":                    `snapshot {{.IsSnapshot}}`,
+		"draft true":                       `draft {{.IsDraft}}`,
 
 		"remove this": "{{ filter .Env.MULTILINE \".*remove.*\" }}",
 		"something with\nmultiple lines\nto test things": "{{ reverseFilter .Env.MULTILINE \".*remove.*\" }}",

www/docs/customization/templates.md

@@ -33,6 +33,7 @@ Key                   |Description
 `.Prerelease`         |the prerelease part of the version, e.g. `beta`[^tag-is-semver]
 `.RawVersion`         |composed of `{Major}.{Minor}.{Patch}` [^tag-is-semver]
 `.ReleaseNotes`       |the generated release notes, available after the changelog step has been executed
+`.IsDraft`            |`true` if `release.draft` is set in the configuration, `false` otherwise. Since v1.17.
 `.IsSnapshot`         |`true` if `--snapshot` is set, `false` otherwise
 `.IsNightly`          |`true` if `--nightly` is set, `false` otherwise
 `.Env`                |a map with system's environment variables