Support importing comment types (#22510)

This commit adds support for specifying comment types when importing
with `gitea restore-repo`. It makes it possible to import issue changes,
such as "title changed" or "assigned user changed".

An earlier version of this pull request was made by Matti Ranta, in
https://future.projects.blender.org/blender-migration/gitea-bf/pulls/3

There are two changes with regard to Matti's original code:

1. The comment type was an `int64` in Matti's code, and is now using a
string. This makes it possible to use `comment_type: title`, which is
more reliable and future-proof than an index into an internal list in
the Gitea Go code.

2. Matti's code also had support for including labels, but in a way that
would require knowing the database ID of the labels before the import
even starts, which is impossible. This can be solved by using label
names instead of IDs; for simplicity I I left that out of this PR.

2 files changed, 16 insertions, 0 deletions

diff --git a/models/issues/comment.go b/models/issues/comment.go
index 87e6b0a229..91dc128277 100644
--- a/models/issues/comment.go
+++ b/models/issues/comment.go
@@ -175,6 +175,15 @@ func (t CommentType) String() string {
 	return commentStrings[t]
 }
 
+func AsCommentType(typeName string) CommentType {
+	for index, name := range commentStrings {
+		if typeName == name {
+			return CommentType(index)
+		}
+	}
+	return CommentTypeUnknown
+}
+
 // RoleDescriptor defines comment tag type
 type RoleDescriptor int
 
diff --git a/models/issues/comment_test.go b/models/issues/comment_test.go
index 0d0570ae34..f1232729f1 100644
--- a/models/issues/comment_test.go
+++ b/models/issues/comment_test.go
@@ -62,3 +62,10 @@ func TestFetchCodeComments(t *testing.T) {
 	assert.NoError(t, err)
 	assert.Len(t, res, 1)
 }
+
+func TestAsCommentType(t *testing.T) {
+	assert.Equal(t, issues_model.CommentTypeUnknown, issues_model.AsCommentType(""))
+	assert.Equal(t, issues_model.CommentTypeUnknown, issues_model.AsCommentType("nonsense"))
+	assert.Equal(t, issues_model.CommentTypeComment, issues_model.AsCommentType("comment"))
+	assert.Equal(t, issues_model.CommentTypePRUnScheduledToAutoMerge, issues_model.AsCommentType("pull_cancel_scheduled_merge"))
+}