internal/testgit: Prepare for tag

5 files changed, 82 insertions, 10 deletions

diff --git a/internal/testgit/command.go b/internal/testgit/command.go
index 7f1835ec..db874bd1 100644
--- a/internal/testgit/command.go
+++ b/internal/testgit/command.go
@@ -25,7 +25,7 @@ func (repo *Repo) command(
 func (repo *Repo) run(
 	tb testing.TB,
 	stdin io.Reader,
-	command string,
+	command string, //nolint:unparam
 	args ...string,
 ) (stdout []byte, err error) {
 	tb.Helper()
diff --git a/internal/testgit/commit.go b/internal/testgit/commit.go
index 883db312..b1838e71 100644
--- a/internal/testgit/commit.go
+++ b/internal/testgit/commit.go
@@ -8,18 +8,11 @@ import (
 	"lindenii.org/go/furgit/object/id"
 )
 
-// CommitTreeIdentity configures an author or committer identity
-// for [Repo.CommitTree].
-type CommitTreeIdentity struct {
-	Name  string
-	Email string
-}
-
 // CommitTreeOptions configures [Repo.CommitTree].
 type CommitTreeOptions struct {
 	Message       string
-	Author        CommitTreeIdentity
-	Committer     CommitTreeIdentity
+	Author        Identity
+	Committer     Identity
 	AuthorDate    string
 	CommitterDate string
 }
diff --git a/internal/testgit/identity.go b/internal/testgit/identity.go
new file mode 100644
index 00000000..1c155464
--- /dev/null
+++ b/internal/testgit/identity.go
@@ -0,0 +1,7 @@
+package testgit
+
+// Identity configures a Git identity.
+type Identity struct {
+	Name  string
+	Email string
+}
diff --git a/internal/testgit/revparse.go b/internal/testgit/revparse.go
new file mode 100644
index 00000000..ffa5b702
--- /dev/null
+++ b/internal/testgit/revparse.go
@@ -0,0 +1,26 @@
+package testgit
+
+import (
+	"fmt"
+	"strings"
+	"testing"
+
+	"lindenii.org/go/furgit/object/id"
+)
+
+// RevParse resolves one revision spec to an object ID.
+func (repo *Repo) RevParse(tb testing.TB, spec string) (id.ObjectID, error) {
+	tb.Helper()
+
+	stdout, err := repo.run(tb, nil, "git", "rev-parse", "--verify", "--end-of-options", spec)
+	if err != nil {
+		return id.ObjectID{}, fmt.Errorf("rev-parse %q: %w", spec, err)
+	}
+
+	objectID, err := repo.objectFormat.FromString(strings.TrimSuffix(string(stdout), "\n"))
+	if err != nil {
+		return id.ObjectID{}, fmt.Errorf("parse git rev-parse output %q: %w", string(stdout), err)
+	}
+
+	return objectID, nil
+}
diff --git a/internal/testgit/tag.go b/internal/testgit/tag.go
new file mode 100644
index 00000000..9aaac157
--- /dev/null
+++ b/internal/testgit/tag.go
@@ -0,0 +1,46 @@
+package testgit
+
+import (
+	"fmt"
+	"testing"
+
+	"lindenii.org/go/furgit/object/id"
+)
+
+// TagAnnotatedOptions configures [Repo.TagAnnotated].
+type TagAnnotatedOptions struct {
+	Message    string
+	Tagger     Identity
+	TaggerDate string
+}
+
+// TagAnnotated creates an annotated tag object and returns its object ID.
+func (repo *Repo) TagAnnotated(
+	tb testing.TB,
+	name string,
+	target id.ObjectID,
+	opts TagAnnotatedOptions,
+) (id.ObjectID, error) {
+	tb.Helper()
+
+	cmd := repo.command(tb, "git", "tag", "-a", "-m", opts.Message, "--end-of-options", name, target.String())
+
+	if opts.Tagger.Name != "" {
+		cmd.Env = setEnv(cmd.Env, "GIT_COMMITTER_NAME", opts.Tagger.Name)
+	}
+
+	if opts.Tagger.Email != "" {
+		cmd.Env = setEnv(cmd.Env, "GIT_COMMITTER_EMAIL", opts.Tagger.Email)
+	}
+
+	if opts.TaggerDate != "" {
+		cmd.Env = setEnv(cmd.Env, "GIT_COMMITTER_DATE", opts.TaggerDate)
+	}
+
+	err := cmd.Run()
+	if err != nil {
+		return id.ObjectID{}, fmt.Errorf("tag -a %q %s: %w", name, target, err)
+	}
+
+	return repo.RevParse(tb, "refs/tags/"+name)
+}