diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..729a846
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,177 @@
+typings/
+
+# Byte-compiled / optimized / DLL files
+__pycache__/
+*.py[cod]
+*$py.class
+
+# C extensions
+*.so
+
+# Distribution / packaging
+.Python
+build/
+develop-eggs/
+dist/
+downloads/
+eggs/
+.eggs/
+lib/
+lib64/
+parts/
+sdist/
+var/
+wheels/
+share/python-wheels/
+*.egg-info/
+.installed.cfg
+*.egg
+MANIFEST
+
+# PyInstaller
+#  Usually these files are written by a python script from a template
+#  before PyInstaller builds the exe, so as to inject date/other infos into it.
+*.manifest
+*.spec
+
+# Installer logs
+pip-log.txt
+pip-delete-this-directory.txt
+
+# Unit test / coverage reports
+htmlcov/
+.tox/
+.nox/
+.coverage
+.coverage.*
+.cache
+nosetests.xml
+coverage.xml
+*.cover
+*.py,cover
+.hypothesis/
+.pytest_cache/
+cover/
+
+# Translations
+*.mo
+*.pot
+
+# Django stuff:
+*.log
+local_settings.py
+db.sqlite3
+db.sqlite3-journal
+
+# Flask stuff:
+instance/
+.webassets-cache
+
+# Scrapy stuff:
+.scrapy
+
+# Sphinx documentation
+docs/_build/
+
+# PyBuilder
+.pybuilder/
+target/
+
+# Jupyter Notebook
+.ipynb_checkpoints
+
+# IPython
+profile_default/
+ipython_config.py
+
+# pyenv
+#   For a library or package, you might want to ignore these files since the code is
+#   intended to run in multiple environments; otherwise, check them in:
+# .python-version
+
+# pipenv
+#   According to pypa/pipenv#598, it is recommended to include Pipfile.lock in version control.
+#   However, in case of collaboration, if having platform-specific dependencies or dependencies
+#   having no cross-platform support, pipenv may install dependencies that don't work, or not
+#   install all needed dependencies.
+#Pipfile.lock
+
+# UV
+#   Similar to Pipfile.lock, it is generally recommended to include uv.lock in version control.
+#   This is especially recommended for binary packages to ensure reproducibility, and is more
+#   commonly ignored for libraries.
+#uv.lock
+
+# poetry
+#   Similar to Pipfile.lock, it is generally recommended to include poetry.lock in version control.
+#   This is especially recommended for binary packages to ensure reproducibility, and is more
+#   commonly ignored for libraries.
+#   https://python-poetry.org/docs/basic-usage/#commit-your-poetrylock-file-to-version-control
+#poetry.lock
+
+# pdm
+#   Similar to Pipfile.lock, it is generally recommended to include pdm.lock in version control.
+#pdm.lock
+#   pdm stores project-wide configurations in .pdm.toml, but it is recommended to not include it
+#   in version control.
+#   https://pdm.fming.dev/latest/usage/project/#working-with-version-control
+.pdm.toml
+.pdm-python
+.pdm-build/
+
+# PEP 582; used by e.g. github.com/David-OConnor/pyflow and github.com/pdm-project/pdm
+__pypackages__/
+
+# Celery stuff
+celerybeat-schedule
+celerybeat.pid
+
+# SageMath parsed files
+*.sage.py
+
+# Environments
+.env
+.venv
+env/
+venv/
+ENV/
+env.bak/
+venv.bak/
+
+# Spyder project settings
+.spyderproject
+.spyproject
+
+# Rope project settings
+.ropeproject
+
+# mkdocs documentation
+/site
+
+# mypy
+.mypy_cache/
+.dmypy.json
+dmypy.json
+
+# Pyre type checker
+.pyre/
+
+# pytype static type analyzer
+.pytype/
+
+# Cython debug symbols
+cython_debug/
+
+# PyCharm
+#  JetBrains specific template is maintained in a separate JetBrains.gitignore that can
+#  be found at https://github.com/github/gitignore/blob/main/Global/JetBrains.gitignore
+#  and can be added to the global gitignore or merged into this file.  For a more nuclear
+#  option (not recommended) you can uncomment the following to ignore the entire idea folder.
+#.idea/
+
+# Ruff stuff:
+.ruff_cache/
+
+# PyPI configuration file
+.pypirc
+
diff --git a/.python-version b/.python-version
new file mode 100644
index 0000000..2c07333
--- /dev/null
+++ b/.python-version
@@ -0,0 +1 @@
+3.11
diff --git a/install.sh b/install.sh
deleted file mode 100755
index f72f4c4..0000000
--- a/install.sh
+++ /dev/null
@@ -1,5 +0,0 @@
-#!/bin/sh
-
-SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
-sudo cp "$SCRIPT_DIR/mailfmt" /usr/bin/mailfmt
-echo "mailfmt has been installed to /usr/bin/mailfmt."
diff --git a/mailfmt.py b/mailfmt.py
new file mode 100755
index 0000000..fadc3dc
--- /dev/null
+++ b/mailfmt.py
@@ -0,0 +1,231 @@
+#!/bin/env python
+
+# Simple text-wrapping script for email.
+# Preserves code blocks, quotes, and signature.
+# Automatically joins and re-wraps paragraphs to
+# ensure even spacing & avoid ugly wrapping.
+# Preserves signoffs.
+# Signoff heuristic:
+# 1-5 words ending with a comma, followed by
+# 1-5 words that each start with capital letters.
+# Author: Daniel Fichtinger
+# License: ISC
+
+import textwrap
+import sys
+import re
+import argparse
+
+
+def main() -> None:
+    paragraph: list[str] = []
+    skipping = False
+    squash = True
+    prev_is_parbreak = False
+    out_stream = sys.stdout
+    reflow = True
+    width = 74
+    break_long_words = False
+    replace_whitespace = True
+    markdown_safe = False
+
+    in_signoff = False
+    in_signature = False
+
+    def pprint(string: str):
+        if markdown_safe and (in_signoff or in_signature) and string:
+            string += " \\"
+        if not squash:
+            print(string, file=out_stream)
+        else:
+            parbreak = not string
+            nonlocal prev_is_parbreak
+            if skipping or not (parbreak and prev_is_parbreak):
+                print(string, file=out_stream)
+            prev_is_parbreak = parbreak
+
+    def wrap(text: str):
+        return textwrap.wrap(
+            text,
+            width=width,
+            break_long_words=break_long_words,
+            replace_whitespace=replace_whitespace,
+        )
+
+    def flush_paragraph():
+        if paragraph:
+            if reflow:
+                joined = " ".join(paragraph)
+                wrapped = wrap(joined)
+                pprint("\n".join(wrapped))
+            else:
+                for line in paragraph:
+                    for wrapped_line in wrap(line):
+                        pprint(wrapped_line)
+            paragraph.clear()
+
+    signoff_cache: str = ""
+
+    def check_signoff(line: str) -> bool:
+        if not line:
+            return False
+        words = line.split()
+        n = len(words)
+        # first potential signoff line
+        if not signoff_cache and 1 <= n <= 5 and line[-1] == ",":
+            return True
+        # second potential line
+        elif signoff_cache and 1 <= n <= 5 and line[-1].isalpha():
+            for w in words:
+                if not w[0].isupper():
+                    return False
+            return True
+        else:
+            return False
+
+    if __name__ == "__main__":
+        parser = argparse.ArgumentParser(
+            description='Formatter for plain text email.\n"--no-*" options are NOT passed by default.',
+            epilog="""
+    Author : Daniel Fichtinger
+    License: ISC
+    Contact: daniel@ficd.ca
+            """,
+            formatter_class=argparse.RawDescriptionHelpFormatter,
+        )
+        parser.add_argument(
+            "-w",
+            "--width",
+            required=False,
+            help="Text width for wrapping. (default: %(default)s)",
+            default=width,
+            type=int,
+        )
+        parser.add_argument(
+            "-b",
+            "--break-long-words",
+            required=False,
+            help="Break long words while wrapping. (default: %(default)s)",
+            action="store_true",
+        )
+        parser.add_argument(
+            "--no-replace-whitespace",
+            required=False,
+            help="Don't normalize whitespace when wrapping.",
+            action="store_false",
+        )
+        parser.add_argument(
+            "--no-reflow",
+            required=False,
+            help="Don't reflow lines.",
+            action="store_false",
+        )
+        parser.add_argument(
+            "--no-signoff",
+            required=False,
+            help="Don't preserve signoff line breaks.",
+            action="store_false",
+        )
+        parser.add_argument(
+            "--no-signature",
+            required=False,
+            help="Don't preserve signature block.",
+            action="store_false",
+        )
+        parser.add_argument(
+            "--no-squash",
+            required=False,
+            help="Don't squash consecutive paragraph breaks.",
+            action="store_false",
+        )
+        parser.add_argument(
+            "-m",
+            "--markdown-safe",
+            required=False,
+            help="Output format safe for Markdown rendering.",
+            action="store_true",
+        )
+        parser.add_argument(
+            "-i",
+            "--input",
+            required=False,
+            type=str,
+            default="STDIN",
+            help="Input file. (default: %(default)s)",
+        )
+        parser.add_argument(
+            "-o",
+            "--output",
+            required=False,
+            type=str,
+            default="STDOUT",
+            help="Output file. (default: %(default)s)",
+        )
+        args = parser.parse_args()
+        width = args.width
+        should_check_signoff = args.no_signoff
+        should_check_signature = args.no_signature
+        reflow = args.no_reflow
+        squash = args.no_squash
+        replace_whitespace = args.no_replace_whitespace
+        break_long_words = args.break_long_words
+        markdown_safe = args.markdown_safe
+
+        if args.input == "STDIN":
+            reader = sys.stdin
+        else:
+            with open(args.input, "r") as in_stream:
+                reader = in_stream
+        if args.output != "STDOUT":
+            out_stream = open(args.output, "w")
+
+        for line in reader:
+            line = line.rstrip()
+            if should_check_signoff:
+                is_signoff = check_signoff(line)
+                if is_signoff:
+                    in_signoff = True
+                    if not signoff_cache:
+                        signoff_cache = line
+                    else:
+                        pprint(signoff_cache)
+                        pprint(line)
+                        in_signoff = False
+                        signoff_cache = ""
+                    continue
+                elif not is_signoff and signoff_cache:
+                    paragraph.append(signoff_cache)
+                    signoff_cache = ""
+                    in_signoff = False
+            if line.startswith("```"):
+                flush_paragraph()
+                skipping = not skipping
+                pprint(line)
+            elif should_check_signature and line == "--":
+                flush_paragraph()
+                skipping = True
+                in_signature = True
+                pprint("-- ")
+            elif not line or re.match(
+                r"^(\s+|-\s+|\+\s+|\*\s+|>\s*|#\s+|From:|To:|Cc:|Bcc:|Subject:|Reply-To:|In-Reply-To:|References:|Date:|Message-Id:|User-Agent:)",
+                line,
+            ):
+                flush_paragraph()
+                pprint(line)
+            elif skipping:
+                pprint(line)
+            else:
+                paragraph.append(line)
+        else:
+            if signoff_cache:
+                paragraph.append(signoff_cache)
+                signoff_cache = ""
+            flush_paragraph()
+        if out_stream is not None:
+            out_stream.close()
+
+
+if __name__ == "__main__":
+    main()
+
+# pyright: basic
diff --git a/pyproject.toml b/pyproject.toml
new file mode 100644
index 0000000..d8dedf2
--- /dev/null
+++ b/pyproject.toml
@@ -0,0 +1,17 @@
+[project]
+name = "mailfmt"
+version = "0.1.0"
+description = "Add your description here"
+readme = "README.md"
+authors = [
+    { name = "Daniel Fichtinger", email = "daniel@ficd.ca" }
+]
+requires-python = ">=3.11"
+dependencies = []
+
+[project.scripts]
+mailfmt = "mailfmt:main"
+
+[build-system]
+requires = ["hatchling"]
+build-backend = "hatchling.build"
diff --git a/src/mailfmt/__init__.py b/src/mailfmt/__init__.py
new file mode 100644
index 0000000..ffdcf09
--- /dev/null
+++ b/src/mailfmt/__init__.py
@@ -0,0 +1,6 @@
+from . import mailfmt
+
+
+def main() -> None:
+    print("Hello from mail format")
+    mailfmt.mailfmt()
diff --git a/mailfmt b/src/mailfmt/mailfmt.py
similarity index 71%
rename from mailfmt
rename to src/mailfmt/mailfmt.py
index a12e4c7..2a1f964 100755
--- a/mailfmt
+++ b/src/mailfmt/mailfmt.py
@@ -16,78 +16,73 @@ import sys
 import re
 import argparse
 
-paragraph: list[str] = []
-skipping = False
-squash = True
-prev_is_parbreak = False
-out_stream = sys.stdout
-reflow = True
-width = 74
-break_long_words = False
-replace_whitespace = True
-markdown_safe = False
 
-in_signoff = False
-in_signature = False
+def mailfmt() -> None:
+    paragraph: list[str] = []
+    skipping = False
+    squash = True
+    prev_is_parbreak = False
+    out_stream = sys.stdout
+    reflow = True
+    width = 74
+    break_long_words = False
+    replace_whitespace = True
+    markdown_safe = False
 
+    in_signoff = False
+    in_signature = False
 
-def pprint(string: str):
-    if markdown_safe and (in_signoff or in_signature) and string:
-        string += " \\"
-    if not squash:
-        print(string, file=out_stream)
-    else:
-        parbreak = not string
-        global prev_is_parbreak
-        if skipping or not (parbreak and prev_is_parbreak):
+    def pprint(string: str):
+        if markdown_safe and (in_signoff or in_signature) and string:
+            string += " \\"
+        if not squash:
             print(string, file=out_stream)
-        prev_is_parbreak = parbreak
-
-
-def wrap(text: str):
-    return textwrap.wrap(
-        text,
-        width=width,
-        break_long_words=break_long_words,
-        replace_whitespace=replace_whitespace,
-    )
-
-
-def flush_paragraph():
-    if paragraph:
-        if reflow:
-            joined = " ".join(paragraph)
-            wrapped = wrap(joined)
-            pprint("\n".join(wrapped))
         else:
-            for line in paragraph:
-                for wrapped_line in wrap(line):
-                    pprint(wrapped_line)
-        paragraph.clear()
+            parbreak = not string
+            nonlocal prev_is_parbreak
+            if skipping or not (parbreak and prev_is_parbreak):
+                print(string, file=out_stream)
+            prev_is_parbreak = parbreak
 
+    def wrap(text: str):
+        return textwrap.wrap(
+            text,
+            width=width,
+            break_long_words=break_long_words,
+            replace_whitespace=replace_whitespace,
+        )
 
-signoff_cache: str = ""
+    def flush_paragraph():
+        if paragraph:
+            if reflow:
+                joined = " ".join(paragraph)
+                wrapped = wrap(joined)
+                pprint("\n".join(wrapped))
+            else:
+                for line in paragraph:
+                    for wrapped_line in wrap(line):
+                        pprint(wrapped_line)
+            paragraph.clear()
 
+    signoff_cache: str = ""
 
-def check_signoff(line: str) -> bool:
-    if not line:
-        return False
-    words = line.split()
-    n = len(words)
-    # first potential signoff line
-    if not signoff_cache and 1 <= n <= 5 and line[-1] == ",":
-        return True
-    # second potential line
-    elif signoff_cache and 1 <= n <= 5 and line[-1].isalpha():
-        for w in words:
-            if not w[0].isupper():
-                return False
-        return True
-    else:
-        return False
+    def check_signoff(line: str) -> bool:
+        if not line:
+            return False
+        words = line.split()
+        n = len(words)
+        # first potential signoff line
+        if not signoff_cache and 1 <= n <= 5 and line[-1] == ",":
+            return True
+        # second potential line
+        elif signoff_cache and 1 <= n <= 5 and line[-1].isalpha():
+            for w in words:
+                if not w[0].isupper():
+                    return False
+            return True
+        else:
+            return False
 
-
-if __name__ == "__main__":
     parser = argparse.ArgumentParser(
         description='Formatter for plain text email.\n"--no-*" options are NOT passed by default.',
         epilog="""
@@ -228,4 +223,8 @@ Contact: daniel@ficd.ca
     if out_stream is not None:
         out_stream.close()
 
+
+if __name__ == "__main__":
+    mailfmt()
+
 # pyright: basic
diff --git a/uninstall.sh b/uninstall.sh
deleted file mode 100755
index e995aa0..0000000
--- a/uninstall.sh
+++ /dev/null
@@ -1,4 +0,0 @@
-#!/bin/sh
-
-sudo rm /usr/bin/mailfmt
-echo "mailfmt has been uninstalled."
diff --git a/uv.lock b/uv.lock
new file mode 100644
index 0000000..6688ee9
--- /dev/null
+++ b/uv.lock
@@ -0,0 +1,8 @@
+version = 1
+revision = 2
+requires-python = ">=3.11"
+
+[[package]]
+name = "mailfmt"
+version = "0.1.0"
+source = { editable = "." }