feat(tmpl): IsSingleTarget (#5122)

refs #5024

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

cmd/build.go

@@ -173,6 +173,7 @@ func setupBuildContext(ctx *context.Context, options buildOpts) error {
 	ctx.Clean = options.clean
 
 	if options.singleTarget {
+		ctx.SingleTarget = true
 		ctx.Partial = true
 	}
 

internal/tmpl/tmpl.go

@@ -53,6 +53,7 @@ const (
 	patch           = "Patch"
 	prerelease      = "Prerelease"
 	isSnapshot      = "IsSnapshot"
+	isSingleTarget  = "IsSingleTarget"
 	isNightly       = "IsNightly"
 	isDraft         = "IsDraft"
 	env             = "Env"
@@ -118,6 +119,7 @@ func New(ctx *context.Context) *Template {
 		patch:           ctx.Semver.Patch,
 		prerelease:      ctx.Semver.Prerelease,
 		isSnapshot:      ctx.Snapshot,
+		isSingleTarget:  ctx.SingleTarget,
 		isNightly:       false,
 		isDraft:         ctx.Config.Release.Draft,
 		releaseNotes:    ctx.ReleaseNotes,

internal/tmpl/tmpl_test.go

@@ -48,6 +48,7 @@ func TestWithArtifact(t *testing.T) {
 			ctx.ModulePath = "github.com/goreleaser/goreleaser/v2"
 			ctx.ReleaseNotes = "test release notes"
 			ctx.Date = time.Unix(1678327562, 0)
+			ctx.SingleTarget = true
 		},
 	)
 	for expect, tmpl := range map[string]string{
@@ -89,6 +90,7 @@ func TestWithArtifact(t *testing.T) {
 		"2023-03-09T02:06:02Z":                `{{ .Date }}`,
 		"1678327562":                          `{{ .Timestamp }}`,
 		"snapshot true":                       `snapshot {{.IsSnapshot}}`,
+		"singletarget true":                   `singletarget {{.IsSingleTarget}}`,
 		"nightly false":                       `nightly {{.IsNightly}}`,
 		"draft true":                          `draft {{.IsDraft}}`,
 		"dirty true":                          `dirty {{.IsGitDirty}}`,

pkg/context/context.go

@@ -102,6 +102,7 @@ type Context struct {
 	Snapshot          bool
 	FailFast          bool
 	Partial           bool
+	SingleTarget      bool
 	SkipTokenCheck    bool
 	Clean             bool
 	PreRelease        bool

www/docs/cmd/goreleaser_build.md

@@ -10,7 +10,7 @@ Its intended usage is, for example, within Makefiles to avoid setting up ldflags
 
 It also allows you to generate a local build for your current machine only using the `--single-target` option, and specific build IDs using the `--id` option in case you have more than one.
 
-When using `--single-target`, the `GOOS` and `GOARCH` environment variables are used to determine the target, defaulting to the current machine target if not set.
+When using `--single-target`, the `GOOS`, `GOARCH`, `GOARM`, `GOAMD64`, and `GOMIPS` environment variables are used to determine the target, defaulting to the current machine target if not set.
 
 
 ```

www/docs/customization/templates.md

@@ -37,6 +37,7 @@ In fields that support templates, these fields are always available:
 | `.IsDraft`             | `true` if `release.draft` is set in the configuration, `false` otherwise                                   |
 | `.IsSnapshot`          | `true` if `--snapshot` is set, `false` otherwise                                                           |
 | `.IsNightly`           | `true` if `--nightly` is set, `false` otherwise                                                            |
+| `.IsSingleTarget`      | `true` if `--single-target` is set, `false` otherwise                                                      |
 | `.Env`                 | a map with system's environment variables                                                                  |
 | `.Date`                | current UTC date in RFC 3339 format                                                                        |
 | `.Now`                 | current UTC date as `time.Time` struct, allows all `time.Time` functions (e.g. `{{ .Now.Format "2006" }}`) |