diff --git a/builtin_commands.py b/builtin_commands.py
new file mode 100644
index 0000000..685039c
--- /dev/null
+++ b/builtin_commands.py
@@ -0,0 +1,5 @@
+from panflute import Element
+
+class commands:
+	def woah(e: Element) -> Element:
+		return e
diff --git a/command.py b/command.py
new file mode 100644
index 0000000..9cd3312
--- /dev/null
+++ b/command.py
@@ -0,0 +1,18 @@
+from panflute import Div,Span
+from util import *
+from typing import Callable
+
+class Command:
+	pass
+
+class InlineCommand(Span, Command):
+	def call(self, f: Callable) -> Span:
+		r = f(self)
+		return replaceEl(self, Span(*r.content, identifier=r.identifier, classes=r.classes, attributes=r.attributes))
+	pass
+
+class MultilineCommand(Div, Command):
+	def call(self, f: Callable) -> Div:
+		r = f(self)
+		return replaceEl(self, Div(*r.content, identifier=r.identifier, classes=r.classes, attributes=r.attributes))
+	pass
diff --git a/formatitko.py b/formatitko.py
index 6f45bae..07125f4 100644
--- a/formatitko.py
+++ b/formatitko.py
@@ -2,26 +2,52 @@
 
 # Import local files
 from whitespace import *
+from command import *
+from util import *
+from builtin_commands import commands
 
 from panflute import *
+import re
 
 from mj_show import show
 
-ifs = ["dog"]
+flags = ["dog"]
 
 def transform(e: Element):
 	"""Transform the AST, making format-agnostic changes."""
 	if isinstance(e, Whitespace) and bavlna(e):
-		e.parent.content[e.index] = NBSP()
+		e = replaceEl(e, NBSP())
 
 	if hasattr(e, "attributes"):
+		# `if` attribute. Only show this element if flag is set.
 		if "if" in e.attributes:
-			if not e.attributes["if"] in ifs:
-				del e.parent.content[e.index]
+			if not e.attributes["if"] in flags:
+				deleteEl(e)
+				return
+		# `ifn` attribute. Only show this element if flag is NOT set
+		if "ifn" in e.attributes:
+			if e.attributes["ifn"] in flags:
+				deleteEl(e)
+				return
+		
+		# `c` attribute. Execute a command with the name saved in this attribute.
+		if (isinstance(e, Div) or isinstance(e, Span)) and "c" in e.attributes:
+			if isinstance(e, Div):
+				e = replaceEl(e, MultilineCommand(*e.content, identifier=e.identifier, classes=e.classes, attributes=e.attributes))
+			else:
+				e = replaceEl(e, InlineCommand(*e.content, identifier=e.identifier, classes=e.classes, attributes=e.attributes))
+	
+	# Handle special command shorthand [!commandname]{}
+	if isinstance(e, Span) and len(e.content) == 1 and isinstance(e.content[0], Str) and re.match(r"^!\w+$", e.content[0].text):
+		e = replaceEl(e, InlineCommand(identifier=e.identifier, classes=e.classes, attributes={**e.attributes, "c": e.content[0].text[1:]}))
 
 	if hasattr(e, "content"):
 		for c in e.content:
 			transform(c)
+
+	# All commands on the inside execute first while being transformed
+	if isinstance(e, Command):
+		pass # TODO: Dodělat tohle
 		
 
 doc = load()
@@ -30,6 +56,5 @@ print(show(doc))
 transform(doc)
 print("---------------------")
 print(show(doc))
-print(vars(doc))
 
 
diff --git a/test.md b/test.md
index 66698e5..de6056c 100644
--- a/test.md
+++ b/test.md
@@ -14,6 +14,8 @@ This should be seen by all.
 
 [This too!]{if=cat}
 
+[An inline command with contents and **bold** and another [!command]{} inside!]{c=bro}
+
 [!woah]{a=b} <!-- A special command! WOW -->
 
 
diff --git a/util.py b/util.py
new file mode 100644
index 0000000..3a05f67
--- /dev/null
+++ b/util.py
@@ -0,0 +1,7 @@
+from panflute import Element
+
+def replaceEl(e: Element, r: Element) -> Element:
+	e.parent.content[e.index] = r
+	return r
+def deleteEl(e: Element):
+	del e.parent.content[e.index]