From 8299617ebc24a4a5bd1dc03070e17713be7e1e1b Mon Sep 17 00:00:00 2001 From: Simon Ser Date: Wed, 12 Feb 2020 14:42:51 +0100 Subject: Turn message part viewers into plugins --- plugins/base/viewer.go | 38 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 38 insertions(+) create mode 100644 plugins/base/viewer.go (limited to 'plugins/base/viewer.go') diff --git a/plugins/base/viewer.go b/plugins/base/viewer.go new file mode 100644 index 0000000..a76ecf9 --- /dev/null +++ b/plugins/base/viewer.go @@ -0,0 +1,38 @@ +package koushinbase + +import ( + "fmt" + + "git.sr.ht/~emersion/koushin" + "github.com/emersion/go-message" +) + +// ErrViewUnsupported is returned by Viewer.ViewMessagePart when the message +// part isn't supported. +var ErrViewUnsupported = fmt.Errorf("cannot generate message view: unsupported part") + +// Viewer is a message part viewer. +type Viewer interface { + // ViewMessagePart renders a message part. The returned value is displayed + // in a template. ErrViewUnsupported is returned if the message part isn't + // supported. + ViewMessagePart(*koushin.Context, *IMAPMessage, *message.Entity) (interface{}, error) +} + +var viewers []Viewer + +// RegisterViewer registers a message part viewer. +func RegisterViewer(viewer Viewer) { + viewers = append(viewers, viewer) +} + +func viewMessagePart(ctx *koushin.Context, msg *IMAPMessage, part *message.Entity) (interface{}, error) { + for _, viewer := range viewers { + v, err := viewer.ViewMessagePart(ctx, msg, part) + if err == ErrViewUnsupported { + continue + } + return v, err + } + return nil, ErrViewUnsupported +} -- cgit v1.2.3-59-g8ed1b