Add markdown widget

Author: kdheepak

Project.toml

@@ -5,6 +5,7 @@ version = "0.1.0"
 
 [deps]
 Crayons = "a8cc5b0e-0ffa-5ad4-8c14-923d3ee1735f"
+Markdown = "d6f4376e-aef5-505a-96c1-9c027394607a"
 REPL = "3fa0cd96-eef1-5676-8a61-b3b8758bbffb"
 TERMIOS = "10233e3b-0d6c-416a-8c1a-d3d286bd6cd2"
 TextWrap = "b718987f-49a8-5099-9789-dcd902bef87d"

src/TerminalUserInterfaces.jl

@@ -23,6 +23,7 @@ include("widgets/widgets.jl")
 
 include("widgets/block.jl")
 
+include("widgets/markdown.jl")
 include("widgets/paragraph.jl")
 include("widgets/progressbar.jl")
 include("widgets/list.jl")

src/widgets/markdown.jl

@@ -0,0 +1,75 @@
+using Markdown
+
+Base.@kwdef struct MarkdownBlock
+    block::Block
+    text::Markdown.MD
+end
+
+function draw(d::MarkdownBlock, area::Rect, buf::Buffer)
+    draw(d.block, area, buf);
+    text_area = inner(d.block, area)
+
+    title_area = Rect(left(area), top(area), width(area), height(area) ÷ 5)
+    # Assume first block is always the header
+    draw(d.text.content[1], title_area, buf)
+
+    body_area = Rect(left(area), bottom(title_area), width(area), height(area) - height(title_area))
+    body_area = Rect(body_area, Margin(5, 5))
+    items = d.text.content[2:end]
+    inner_area = Rect(left(body_area), top(body_area) - height(body_area) ÷ length(items), width(body_area), height(body_area) ÷ length(items))
+    for (i, c) in enumerate(d.text.content[2:end])
+        inner_area = Rect(left(inner_area), bottom(inner_area), width(inner_area), height(inner_area))
+        draw(c, inner_area, buf)
+    end
+end
+
+function draw(h::Markdown.Header, area::Rect, buf::Buffer)
+    b = Block(border_type = BorderTypeLight)
+    draw(b, area, buf);
+
+    title = h.text[1]
+
+    row = top(area) + height(area) ÷ 2
+    col = width(area) ÷ 2 - ( length(title) ÷ 2 )
+    set(buf, col, row, title, Crayon(bold = true))
+end
+
+function draw(l::Markdown.List, area::Rect, buf::Buffer)
+
+    for (i, item) in enumerate(l.items)
+        item_area = Rect(
+            left(area),
+            top(area) + (i - 1) * (height(area) ÷ length(l.items)),
+            width(area),
+            height(area) ÷ length(l.items)
+        )
+        row = top(item_area)
+        col = left(item_area)
+        set(buf, col, row, " * ", Crayon(bold = true, foreground = :red))
+        inner_area = Rect(item_area, Margin(0, 5))
+        draw(item[1], inner_area, buf)
+    end
+
+end
+
+function draw(p::Markdown.Paragraph, area::Rect, buf::Buffer)
+
+    row = top(area)
+    col = left(area)
+    for c in p.content
+        if typeof(c) == String
+            l = length(c)
+            set(buf, col, row, c)
+            col += l
+        elseif typeof(c) == Markdown.Bold
+            l = length(c.text[1])
+            set(buf, col, row, c.text[1], Crayon(bold = true))
+            col += l
+        elseif typeof(c) == Markdown.Italic
+            l = length(c.text[1])
+            set(buf, col, row, c.text[1], Crayon(italics = true))
+            col += l
+        end
+    end
+
+end