Implement STDERR output flag for interactive sorting

.github/workflows/ci.yml

@@ -11,7 +11,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: ["3.8", "3.9", "3.10", "3.11", "3.12"]
+        python-version: ["3.10", "3.11", "3.12"]
 
     steps:
     - uses: actions/checkout@v4
@@ -49,4 +49,4 @@ jobs:
       run: tox -e lint
 
     - name: Check formatting with ruff
-      run: tox -e format-check
+      run: tox -e format-check

.gitignore

@@ -1,159 +1,93 @@
-# Byte-compiled / optimized / DLL files
-__pycache__/
-*.py[cod]
 *$py.class
-
-# C extensions
+*$py.class
+*.cover
+*.egg
+*.egg-info/
+*.log
+*.manifest
+*.manifest
+*.mo
+*.pot
+*.py,cover
+*.py[cod]
+*.py[cod]
+*.sage.py
 *.so
-
-# Distribution / packaging
+*.so
+*.spec
+*.spec
+*.swo
+*.swp
+*~
+.DS_Store
 .Python
+.cache
+.coverage
+.coverage.*
+.dmypy.json
+.eggs/
+.env
+.hypothesis/
+.hypothesis/
+.idea/
+.installed.cfg
+.ipynb_checkpoints
+.mypy_cache/
+.nox/
+.pdm.toml
+.pybuilder/
+.pyre/
+.pytest_cache/
+.pytest_cache/
+.pytype/
+.ropeproject
+.scrapy
+.spyderproject
+.spyproject
+.tox/
+.tox/
+.venv
+.vscode/
+.webassets-cache
+/site
+ENV/
+MANIFEST
+Thumbs.db
+__pycache__/
+__pycache__/
+__pypackages__/
 build/
+celerybeat-schedule
+celerybeat.pid
+cover/
+coverage.xml
+cython_debug/
+db.sqlite3
+db.sqlite3-journal
 develop-eggs/
 dist/
+dmypy.json
+docs/_build/
 downloads/
 eggs/
-.eggs/
+env.bak/
+env/
+htmlcov/
+htmlcov/
+instance/
+ipython_config.py
 lib/
 lib64/
+local_settings.py
+nosetests.xml
 parts/
+pip-delete-this-directory.txt
+pip-log.txt
+profile_default/
 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
-
-# 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/#use-with-ide
-.pdm.toml
-
-# 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/
+var/
 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 added to the global gitignore or merged into this project gitignore.  For a PyCharm
-#  project, it is also recommended to add the following:
-#  .idea/
+venv/
+wheels/

src/interactive_sort/main.py

@@ -3,6 +3,7 @@
 import bisect
 import os
 import re
+import sys
 from functools import cmp_to_key
 
 
@@ -154,8 +155,12 @@ def key_func(x):
 
     def display_sorted(self):
         """Displays the current sorted data."""
-        os.system("cls" if os.name == "nt" else "clear")
-        print("--- Interactive Sorted Data ---")
+        output_stream = sys.stderr if self.args.stderr else sys.stdout
+
+        if not self.args.stderr:
+            os.system("cls" if os.name == "nt" else "clear")
+
+        print("--- Interactive Sorted Data ---", file=output_stream)
         items_to_display = self.data
         if self.args.unique:
             items_to_display = sorted(
@@ -165,21 +170,39 @@ def display_sorted(self):
             items_to_display = reversed(items_to_display)
 
         for item in items_to_display:
-            print(item)
-        print("-----------------------------")
+            print(item, file=output_stream)
+        print("-----------------------------", file=output_stream)
+
+    def output_final_sorted(self):
+        """Outputs the final sorted data to stdout (used when stderr flag is set)."""
+        items_to_display = self.data
+        if self.args.unique:
+            items_to_display = sorted(
+                set(items_to_display), key=lambda x: self.data.index(x)
+            )  # Maintain original order of first occurrence
+        if self.args.reverse:
+            items_to_display = reversed(items_to_display)
+
+        for item in items_to_display:
+            print(item, file=sys.stdout)
 
     def run(self):
         """Runs the interactive sort application."""
-        print("Enter lines of text. Press Ctrl+D (or Ctrl+Z then Enter on Windows) to finish.")
+        output_stream = sys.stderr if self.args.stderr else sys.stdout
+        print("Enter lines of text. Press Ctrl+D (or Ctrl+Z then Enter on Windows) to finish.", file=output_stream)
         try:
             while True:
                 line = input()
                 self.add_item(line)
                 self.display_sorted()
         except EOFError:
-            print("\nEnd of input.")
+            if self.args.stderr:
+                # When using stderr flag, output final sorted result to stdout
+                self.output_final_sorted()
+            else:
+                print("\nEnd of input.", file=output_stream)
         except KeyboardInterrupt:
-            print("\nExiting.")
+            print("\nExiting.", file=output_stream)
 
 
 def main():