diff --git a/.gitignore b/.gitignore
index b60de5b..79efafb 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1,3 @@
 **/target
+.venv/
+**/__pycache__
diff --git a/pyproject.toml b/pyproject.toml
new file mode 100644
index 0000000..2397bf8
--- /dev/null
+++ b/pyproject.toml
@@ -0,0 +1,13 @@
+[project]
+name = "balloon"
+version = "0.0.1"
+description = "Reuse chunks of HTML in other HTML files via preprocessing."
+authors = ["Cutieguwu <olivia.a.brooks77@gmail.com>"]
+dependencies = [
+    "result",
+]
+
+requires-python = ">=3.13"
+
+[tool.uv.sources]
+result = { git = "https://github.com/montasaurus/result" }
diff --git a/src/main.py b/src/main.py
index a465ad3..b9f2879 100644
--- a/src/main.py
+++ b/src/main.py
@@ -3,9 +3,7 @@ from __future__ import annotations
 from dataclasses import dataclass
 from types import NoneType
 from typing import Optional
-from icecream.icecream import print_function
 from result import Result, Ok, Err
-from icecream import ic
 import os
 import sys
 
@@ -49,14 +47,14 @@ class Tag:
         return param_value
 
     def write(self) -> str:
-        return f'<{self.value}>{self.trail if self.trail != None else ''}'
+        return f'<{self.value}>{self.trail if self.trail != None else ""}'
 
 @dataclass
 class HTML:
     value: str
 
     # Returns all tags in order in the html file.
-    def tags(self) -> list[Tag]:
+    def tags(self) -> Result[list[Tag], str]:
         tag = str()
         trail: Optional[str] = str()
         tags = list()
@@ -72,16 +70,25 @@ class HTML:
                 record = not record # why can't I have ! operator...
             elif record == True:
                 tag += c
+
             else:
-                trail += c
+                try:
+                    assert type(trail) == str
+                    trail += c
+                except AssertionError:
+                    return Err('Invalid HTML Structure')
 
         tags.append(Tag(tag, trail))
-        return tags
+        return Ok(tags)
 
     def inflate(self) -> Result[str, str]:
         file = str()
 
-        for tag in self.tags():
+        tags = self.tags()
+        if tags.is_err():
+            return Err(tags.err()) # type: ignore[arg-type]
+
+        for tag in tags.ok(): # type: ignore[union-attr]
             if tag.type() == 'include':
                 chunk = tag.get_param('src')
                 if isinstance(chunk, NoneType):
@@ -98,36 +105,32 @@ class HTML:
     def write(self) -> str:
         return self.inflate().unwrap()
 
-
 def main() -> None:
     # If:
     #   Incorrect number of arguments
     #   Long help flag
     #   Short help flag
-    if len(sys.argv) != 2 or (
+    if len(sys.argv) != 3 or (
         sys.argv[0] == '--help'
         or sys.argv[0] == '-h'
     ):
         help()
         return
 
-    file_name = sys.argv[1].removeprefix('src/')
-
-    with open(str(WORK_DIR) + 'src/' + file_name, 'rt') as f:
+    with open(str(WORK_DIR) + sys.argv[1], 'rt') as f:
         html_src = HTML(f.read())
 
+    # Patch to make sure that target paths are available.
     try:
-        os.makedirs(str(WORK_DIR) + 'target/' + os.path.dirname(file_name))
+        os.makedirs(str(WORK_DIR) + os.path.dirname(sys.argv[2]))
     except FileExistsError:
         pass
 
-    with open(str(WORK_DIR) + 'target/' + file_name, 'w') as f:
+    with open(str(WORK_DIR) + sys.argv[2], 'w') as f:
         f.write(html_src.write())
 
 def help() -> None:
-    print('Usage: python balloon.py [OPTIONS] <SOURCE>')
-    print()
-    print('Note: balloon implicitly assumes that <SOURCE> is in src/, and should inflate into target/')
+    print('Usage: python balloon.py [OPTIONS] <SOURCE> <DESTINATION>')
     print()
     print()
     print('Options:')
diff --git a/uv.lock b/uv.lock
new file mode 100644
index 0000000..266efc2
--- /dev/null
+++ b/uv.lock
@@ -0,0 +1,19 @@
+version = 1
+revision = 3
+requires-python = ">=3.13"
+
+[[package]]
+name = "balloon"
+version = "0.0.1"
+source = { virtual = "." }
+dependencies = [
+    { name = "result" },
+]
+
+[package.metadata]
+requires-dist = [{ name = "result", git = "https://github.com/montasaurus/result" }]
+
+[[package]]
+name = "result"
+version = "0.19.0"
+source = { git = "https://github.com/montasaurus/result#59cd2fb7b57e4851a7054917fbd03c4c8f68a62f" }