Start: Add shell script

Same as the batch file. Also edit the python script to work when
a venv is clean.

Signed-off-by: kingbri <bdashore3@proton.me>

start.py

@@ -3,7 +3,6 @@ import argparse
 import os
 import pathlib
 import subprocess
-from main import entrypoint
 
 
 def get_requirements_file():
@@ -44,7 +43,7 @@ def get_argparser():
 
 
 if __name__ == "__main__":
-    subprocess.run("pip -V")
+    subprocess.run(["pip", "-V"])
 
     parser = get_argparser()
     args = parser.parse_args()
@@ -55,6 +54,8 @@ if __name__ == "__main__":
         requirements_file = (
             "requirements-nowheel" if args.nowheel else get_requirements_file()
         )
-        subprocess.run(f"pip install -U -r {requirements_file}.txt")
+        subprocess.run(["pip", "install", "-U", "-r", f"{requirements_file}.txt"])
 
+    # Import entrypoint after installing all requirements
+    from main import entrypoint
     entrypoint()

start.sh

@@ -1,5 +1,19 @@
 #!/bin/bash
-cd "$(dirname "$0")"
-source ./venv/bin/activate
-pip -V
-python main.py
+
+cd "$(dirname "$0")" || exit
+
+if [ -n "$CONDA_PREFIX" ]; then
+    echo "It looks like you're in a conda environment. Skipping venv check."
+else
+    if [ ! -d "venv" ]; then
+        echo "Venv doesn't exist! Creating one for you."
+        python3 -m venv venv
+    fi
+
+    echo "Activating venv"
+
+    # shellcheck source=/dev/null
+    source venv/bin/activate
+fi
+
+python3 start.py "$@"