39 lines
1.0 KiB
Go
39 lines
1.0 KiB
Go
package alpsbase
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import (
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"fmt"
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"git.sr.ht/~emersion/alps"
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"github.com/emersion/go-message"
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)
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// ErrViewUnsupported is returned by Viewer.ViewMessagePart when the message
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// part isn't supported.
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var ErrViewUnsupported = fmt.Errorf("cannot generate message view: unsupported part")
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// Viewer is a message part viewer.
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type Viewer interface {
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// ViewMessagePart renders a message part. The returned value is displayed
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// in a template. ErrViewUnsupported is returned if the message part isn't
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// supported.
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ViewMessagePart(*alps.Context, *IMAPMessage, *message.Entity) (interface{}, error)
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}
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var viewers []Viewer
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// RegisterViewer registers a message part viewer.
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func RegisterViewer(viewer Viewer) {
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viewers = append(viewers, viewer)
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}
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func viewMessagePart(ctx *alps.Context, msg *IMAPMessage, part *message.Entity) (interface{}, error) {
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for _, viewer := range viewers {
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v, err := viewer.ViewMessagePart(ctx, msg, part)
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if err == ErrViewUnsupported {
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continue
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}
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return v, err
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}
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return nil, ErrViewUnsupported
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}
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