add plugin to show colors

plugins/palette.go

@@ -0,0 +1,73 @@
+package plugins
+
+import (
+	"fmt"
+	"image"
+	"image/color"
+	"regexp"
+
+	"github.com/matrix-org/gomatrix"
+)
+
+// Palette responds to color messages
+type Palette struct {
+}
+
+// Descr describes this plugin
+func (h *Palette) Descr() string {
+	return "Creates an solid 256x56 image of the color specified."
+}
+
+// Re is the regex for matching color messages.
+func (h *Palette) Re() string {
+	return `(?i)^#[a-f0-9]{6}$`
+}
+
+// Match determines if we are asking for a color
+func (h *Palette) Match(user, msg string) bool {
+	re := regexp.MustCompile(h.Re())
+	return re.MatchString(msg)
+}
+
+// SetStore we don't need a store here
+func (h *Palette) SetStore(s PluginStore) {}
+
+func (h *Palette) parseHexColor(s string) (*color.RGBA, error) {
+	c := &color.RGBA{
+		A: 0xff,
+	}
+	_, err := fmt.Sscanf(s, "#%02x%02x%02x", &c.R, &c.G, &c.B)
+	if err != nil {
+		return nil, err
+	}
+
+	return c, nil
+}
+
+// RespondText to color request events
+func (h *Palette) RespondText(c *gomatrix.Client, ev *gomatrix.Event, user, post string) {
+	const width, height = 256, 56
+
+	img := image.NewRGBA(image.Rect(0, 0, 256, 56))
+	color, err := h.parseHexColor(post)
+	if err != nil {
+		fmt.Println(err)
+		SendText(c, ev.RoomID, fmt.Sprintf("%s", err))
+	}
+
+	for y := 0; y < height; y++ {
+		for x := 0; x < width; x++ {
+			img.Set(x, y, color)
+		}
+	}
+
+	err = SendImage(c, ev.RoomID, img)
+	if err != nil {
+		fmt.Println(err)
+	}
+}
+
+// Name color
+func (h *Palette) Name() string {
+	return "Palette"
+}

plugins/plugins.go

@@ -188,6 +188,7 @@ var Plugs = Plugins{
 	&Hi{},
 	&LoveYou{},
 	&OpenBSDMan{},
+	&Palette{},
 	&Snap{},
 	&Source{},
 	&Thanks{},