diff --git a/.gitignore b/.gitignore
index c18dd8d..372c13e 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1,2 @@
 __pycache__/
+
diff --git a/.mypy.ini b/.mypy.ini
deleted file mode 100644
index 4c10470..0000000
--- a/.mypy.ini
+++ /dev/null
@@ -1,2 +0,0 @@
-[mypy]
-python_version = 3.12.3
diff --git a/.ruff.toml b/.ruff.toml
index 782b4a4..23f9b37 100644
--- a/.ruff.toml
+++ b/.ruff.toml
@@ -1,5 +1,7 @@
-line-length = 78
-indent-width = 4
+line-length = 79
+indent-width = 2
+target-version = "py312"
 
 [lint]
-select = ["E", "F"]
+select = ["W", "E", "F", "C"]
+
diff --git a/LICENSE b/LICENSE
index fdddb29..1e9858b 100644
--- a/LICENSE
+++ b/LICENSE
@@ -22,3 +22,4 @@ ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 OTHER DEALINGS IN THE SOFTWARE.
 
 For more information, please refer to <https://unlicense.org>
+
diff --git a/README.md b/README.md
index 4d9c604..adc16d0 100644
--- a/README.md
+++ b/README.md
@@ -5,3 +5,10 @@ rewriting [pyzule](https://github.com/asdfzxcvbn/pyzule), but actually good this
 this is pretty much just a hobby project that i'll work on when i'm bored. pyzule in its current state is kinda ugly, but it works and i haven't really had the motivation to work on it. there really isn't any need for improvements, anyway..
 
 `cyan` will target python v3.12 (finally!), be pep8-compliant (hopefully..), and be type-hinted!
+
+## plan
+
+- have a __main__ file ofc, this is what `cyan` command runs
+- also have a cyan file, it should have the main logic of the program
+- have other files for a class of the ipa/app, main executable, etc
+
diff --git a/cyan.py b/cyan.py
deleted file mode 100755
index 32cd01c..0000000
--- a/cyan.py
+++ /dev/null
@@ -1,32 +0,0 @@
-#!/usr/bin/python3
-# cyan, aka pyzule-rw; by zx, 2024
-
-import os
-import sys
-import argparse
-
-parser = argparse.ArgumentParser(
-    description="cyan, an azule \"clone\" for modifying iOS apps")
-parser.add_argument("-o", metavar="output",
-                    help="if unspecified, overwrites input")
-parser.add_argument("-f", metavar="file", nargs="+",
-                    help="a tweak to inject/item to be added to the bundle")
-
-parser.add_argument("--overwrite", action="store_true",
-                    help="skip overwrite confirmation")
-
-parser.add_argument("input", help="the app to be modified (.app/.ipa)")
-args = parser.parse_args()
-
-INPUT = os.path.realpath(args.input)
-WORKING_DIR = os.getcwd()
-PZ_DIR = os.path.expanduser("~/.config/cyan")
-changed = False
-
-if not (INPUT.endswith(".ipa") or INPUT.endswith(".app")):
-    sys.exit("[!] input must be a .ipa/.app")
-elif not os.path.exists(INPUT):
-    sys.exit("[!] input does not exist")
-elif not args.o and (input("[<] override your input file? [y/N] ").strip()
-                     .lower() not in ("y", "yes")):
-    sys.exit("[!] not overriding input, missing -o")
diff --git a/requirements.txt b/requirements.txt
new file mode 100644
index 0000000..7892fdd
--- /dev/null
+++ b/requirements.txt
@@ -0,0 +1,2 @@
+lief
+
diff --git a/src/__main__.py b/src/__main__.py
new file mode 100755
index 0000000..d4275ca
--- /dev/null
+++ b/src/__main__.py
@@ -0,0 +1,49 @@
+#!/usr/bin/env python3
+# cyan, aka pyzule-rw; by zx, 2024
+
+import argparse
+
+import cyan
+
+
+def main() -> None:
+  parser = argparse.ArgumentParser(
+    description="cyan, an azule \"clone\" for modifying iOS apps"
+  )
+
+  parser.add_argument(
+    "-i", "--input", metavar="input", required=True,
+    help="the app to be modified (.app/.ipa)"
+  )
+  parser.add_argument(
+    "-o", "--output", metavar="output",
+    help="if unspecified, overwrites input"
+  )
+
+  parser.add_argument(
+    "-f", metavar="file", nargs="+",
+    help="a tweak to inject/item to be added to the bundle"
+  )
+
+  parser.add_argument(
+    "--overwrite", action="store_true",
+    help="skip overwrite confirmation"
+  )
+
+  cyan.main(parser)
+
+if __name__ == "__main__":
+  main()
+
+# INPUT = os.path.realpath(args.input)
+# WORKING_DIR = os.getcwd()
+# PZ_DIR = os.path.expanduser("~/.config/cyan")
+# changed = False
+
+# if not (INPUT.endswith(".ipa") or INPUT.endswith(".app")):
+#     sys.exit("[!] input must be a .ipa/.app")
+# elif not os.path.exists(INPUT):
+#     sys.exit("[!] input does not exist")
+# elif not args.o and (input("[<] override your input file? [y/N] ").strip()
+#                      .lower() not in ("y", "yes")):
+#     sys.exit("[!] not overriding input, missing -o")
diff --git a/src/cyan.py b/src/cyan.py
new file mode 100644
index 0000000..90530fd
--- /dev/null
+++ b/src/cyan.py
@@ -0,0 +1,25 @@
+import os
+from argparse import ArgumentParser
+
+import tbhutils
+
+
+def main(parser: ArgumentParser) -> None:
+  args = parser.parse_args()
+  args.i = os.path.normpath(args.input)
+
+  if args.output is not None:
+    args.o = os.path.normpath(args.output)
+    if not (args.o.endswith(".app") or args.o.endswith(".ipa")):
+      print("[?] output's file extension not specified; will create ipa")
+      args.o += ".ipa"
+  else:
+    args.o = args.i
+
+  arg_err = tbhutils.validate_inputs(args)
+  if arg_err is not None:
+    parser.error(arg_err)
+
+  # verbose notices
+  if args.o
+
diff --git a/src/tbhutils.py b/src/tbhutils.py
new file mode 100644
index 0000000..6c4281d
--- /dev/null
+++ b/src/tbhutils.py
@@ -0,0 +1,17 @@
+import os
+from typing import Optional
+from argparse import Namespace
+
+
+def validate_inputs(args: Namespace) -> Optional[str]:
+  if not (
+      args.i.endswith(".ipa")
+      or args.i.endswith(".app")
+  ):
+    return "the input file must be an ipa/app"
+
+  if not os.path.exists(args.i):
+    return f"{args.i} does not exist"
+
+
+