add rc/markdown.kak

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diff --git a/rc/markdown.kak b/rc/markdown.kak
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+# http://daringfireball.net/projects/markdown
+# ‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾
+
+# Detection
+# ‾‾‾‾‾‾‾‾‾
+
+hook global BufSetOption mimetype=text/x-markdown %{
+    set buffer filetype markdown
+}
+
+hook global BufCreate .*[.](markdown|md) %{
+    set buffer filetype markdown
+}
+
+# Highlighters
+# ‾‾‾‾‾‾‾‾‾‾‾‾
+
+addhl -group / regions -default content markdown \
+    sh         ```sh   ```                    '' \
+    fish       ```fish ```                    '' \
+    ruby       ```ruby ```                    '' \
+    code       ```     ```                    '' \
+    code       ``       ``                    '' \
+    code       `         `                    ''
+
+addhl -group /markdown/code fill meta
+
+addhl -group /markdown/sh   ref sh
+addhl -group /markdown/fish ref fish
+addhl -group /markdown/ruby ref ruby
+
+# Setext-style header
+addhl -group /markdown/content regex (\A|\n\n)[^\n]+\n={2,}\h*\n\h*$ 0:blue
+addhl -group /markdown/content regex (\A|\n\n)[^\n]+\n-{2,}\h*\n\h*$ 0:cyan
+
+# Atx-style header
+addhl -group /markdown/content regex ^(#+)(\h+)([^\n]+) 1:red
+
+addhl -group /markdown/content regex ^\h+([-\*])\h+[^\n]*(\n\h+[^-\*]\S+[^\n]*)*$ 0:yellow 1:cyan
+addhl -group /markdown/content regex ^([-=~]+)\n[^\n\h].*?\n\1$ 0:magenta
+addhl -group /markdown/content regex (?<!\w)\+[^\n]+?\+(?!\w) 0:green
+addhl -group /markdown/content regex (?<!\w)_[^\n]+?_(?!\w) 0:yellow
+addhl -group /markdown/content regex (?<!\w)\*[^\n]+?\*(?!\w) 0:red
+addhl -group /markdown/content regex <[a-z]+://.*?> 0:cyan
+addhl -group /markdown/content regex ^\h*(>\h*)+ 0:comment
+addhl -group /markdown/content regex \H\K\h\h$ 0:PrimarySelection
+
+# Commands
+# ‾‾‾‾‾‾‾‾
+
+def -hidden _markdown_filter_around_selections %{
+    eval -draft -itersel %{
+        exec <a-x>
+        # remove trailing white spaces
+        try %{ exec -draft s \h+$ <ret> d }
+    }
+}
+
+def -hidden _markdown_indent_on_new_line %{
+    eval -draft -itersel %{
+        # preserve previous line indent
+        try %{ exec -draft <space> K <a-&> }
+        # filter previous line
+        try %{ exec -draft k : _markdown_filter_around_selections <ret> }
+        # copy block quote(s), list item prefix and following white spaces
+        try %{ exec -draft k x s ^\h*\K((>\h*)|[*+-])+\h* <ret> y j p }
+    }
+}
+
+# Initialization
+# ‾‾‾‾‾‾‾‾‾‾‾‾‾‾
+
+hook global WinSetOption filetype=markdown %{
+    addhl ref markdown
+
+    hook window InsertEnd  .* -group markdown-hooks  _markdown_filter_around_selections
+    hook window InsertChar \n -group markdown-indent _markdown_indent_on_new_line
+}
+
+hook global WinSetOption filetype=(?!markdown).* %{
+    rmhl markdown
+    rmhooks window markdown-indent
+    rmhooks window markdown-hooks
+}