feat: imgage feature

backend/uframe/keywords.py

@@ -20,7 +20,7 @@ from uframe.ir import (
     Gauge, Sparkline, Status, Table,
     Form, Field, Password, Radio, Checkbox, FormButton,
     Let, Source, IfBlock, ForLoop, CacheControl, OnSubmit, StateDecl,
-    BigTitle,
+    BigTitle, ImageNode,
     ComponentDef, ComponentUse,
 )
 from uframe.themes import BUILTIN_THEMES
@@ -120,6 +120,25 @@ register_keyword("columns", section="",
 # Big Text
 # ---------------------------------------------------------------------------
 
+register_keyword("image", node_class=ImageNode, section="Content",
+    detail='image "path.png" braille 30',
+    snippet='image "${path}" ${mode:braille} ${width:30}',
+    highlight_values=["braille", "block", "ascii", "halfblock"],
+    is_leaf=True)
+
+register_keyword("dither", section="",
+    detail="", snippet="",
+    highlight_values=["floyd", "threshold", "none"],
+    is_style_directive=True)
+
+register_keyword("invert", section="",
+    detail="", snippet="",
+    is_style_directive=True)
+
+register_keyword("caption", section="",
+    detail="", snippet="",
+    is_style_directive=True)
+
 register_keyword("bigtitle", node_class=BigTitle, section="Content",
     detail='bigtitle "TEXT" block',
     snippet='bigtitle "${text}" ${font:block}',