Initial commit

1 files changed, 112 insertions, 0 deletions

diff --git a/renderer/renderer.go b/renderer/renderer.go
new file mode 100644
index 0000000..c3d3526
--- /dev/null
+++ b/renderer/renderer.go
@@ -0,0 +1,112 @@
+package renderer
+
+import (
+	"context"
+	"io"
+	"strconv"
+	"strings"
+	"text/template"
+	"time"
+
+	"mastodon"
+)
+
+type Renderer interface {
+	RenderErrorPage(ctx context.Context, writer io.Writer, err error)
+	RenderHomePage(ctx context.Context, writer io.Writer) (err error)
+	RenderSigninPage(ctx context.Context, writer io.Writer) (err error)
+	RenderTimelinePage(ctx context.Context, writer io.Writer, data *TimelinePageTemplateData) (err error)
+	RenderThreadPage(ctx context.Context, writer io.Writer, data *ThreadPageTemplateData) (err error)
+}
+
+type renderer struct {
+	template *template.Template
+}
+
+func NewRenderer(templateGlobPattern string) (r *renderer, err error) {
+	t := template.New("default")
+	t, err = t.Funcs(template.FuncMap{
+		"WithEmojis":              WithEmojis,
+		"DisplayInteractionCount": DisplayInteractionCount,
+		"TimeSince":               TimeSince,
+		"FormatTimeRFC3339":       FormatTimeRFC3339,
+	}).ParseGlob(templateGlobPattern)
+	if err != nil {
+		return
+	}
+	return &renderer{
+		template: t,
+	}, nil
+}
+
+func (r *renderer) RenderErrorPage(ctx context.Context, writer io.Writer, err error) {
+	r.template.ExecuteTemplate(writer, "error.tmpl", err)
+	return
+}
+
+func (r *renderer) RenderHomePage(ctx context.Context, writer io.Writer) (err error) {
+	return r.template.ExecuteTemplate(writer, "homepage.tmpl", nil)
+}
+
+func (r *renderer) RenderSigninPage(ctx context.Context, writer io.Writer) (err error) {
+	return r.template.ExecuteTemplate(writer, "signin.tmpl", nil)
+}
+
+func (r *renderer) RenderTimelinePage(ctx context.Context, writer io.Writer, data *TimelinePageTemplateData) (err error) {
+	return r.template.ExecuteTemplate(writer, "timeline.tmpl", data)
+}
+
+func (r *renderer) RenderThreadPage(ctx context.Context, writer io.Writer, data *ThreadPageTemplateData) (err error) {
+	return r.template.ExecuteTemplate(writer, "thread.tmpl", data)
+}
+
+func WithEmojis(content string, emojis []mastodon.Emoji) string {
+	var emojiNameContentPair []string
+	for _, e := range emojis {
+		emojiNameContentPair = append(emojiNameContentPair, ":"+e.ShortCode+":", "<img class=\"status-emoji\" src=\""+e.URL+"\" alt=\""+e.ShortCode+"\" />")
+	}
+	return strings.NewReplacer(emojiNameContentPair...).Replace(content)
+}
+
+func DisplayInteractionCount(c int64) string {
+	if c > 0 {
+		return strconv.Itoa(int(c))
+	}
+	return ""
+}
+
+func TimeSince(t time.Time) string {
+	dur := time.Since(t)
+
+	s := dur.Seconds()
+	if s < 60 {
+		return strconv.Itoa(int(s)) + "s"
+	}
+
+	m := dur.Minutes()
+	if m < 60 {
+		return strconv.Itoa(int(m)) + "m"
+	}
+
+	h := dur.Hours()
+	if h < 24 {
+		return strconv.Itoa(int(h)) + "h"
+	}
+
+	d := h / 24
+	if d < 30 {
+		return strconv.Itoa(int(d)) + "d"
+	}
+
+	mo := d / 30
+	if mo < 12 {
+		return strconv.Itoa(int(mo)) + "mo"
+	}
+
+	y := m / 12
+	return strconv.Itoa(int(y)) + "y"
+}
+
+func FormatTimeRFC3339(t time.Time) string {
+	return t.Format(time.RFC3339)
+}