Update run-from-git instructions

With the switch fromm requirements.txt to pyproject.toml,
the instructions no longer were accurate.

Also add instructions on how to use virtual environment and
how to install optional dependencies.

Author: dconrad5

docs/run-from-git.md

@@ -2,7 +2,7 @@
 title: Run from Git
 ---
 
-If you are on Linux and want to try out the latest version of gPodder, it is easy to do by cloning from Git. You only need Python, PyGObject3, Gtk3 and Git installed, all other dependencies can be installed into the Git checkout.
+If you want to try out the latest version of gPodder or help develop, it is easy to clone from Git. You only need Python, PyGObject3, Gtk3 and Git installed, all other dependencies can be installed into the Git checkout.
 
 ## Do I need `root`, compile anything or install it system-wide?
 
@@ -25,28 +25,62 @@ As gPodder is written in Python, there is no need to compile anything or to inst
 
 ## Optional Dependencies
 
+Defined in pyproject.toml:
+
+* eyed3
+* PySocks
 * html5lib
 * mutagen
+* filelock
+* pillow
 * yt-dlp
 
 ## Instructions
 
+First time setup:
+
     git clone https://github.com/gpodder/gpodder.git
     cd gpodder
-    # To install required and optional dependencies
-    # (not including git, python or gtk3 dependencies)
-    python3 -m pip install -r tools/requirements.txt         # as root
-    python3 -m pip install --user -r tools/requirements.txt  # as user
+
+    # Optional: create virtual environment (required on MacOS)
+    python3 -m venv ./.venv
+    # load virtual environment, if using one
+    source ./.venv/bin/activate
+
+    # Select one of the following four steps to install dependencies:
+    # (does not install git, python or gtk3 dependencies)
+
+    # required dependencies only (as root, or if in virtual environment)
+    python3 -m pip install .
+    # required dependencies only (as user)
+    python3 -m pip install --user .
+    # required and optional dependencies (as root, or if in virtual environment)
+    python3 -m pip install '.[eyed3,gui,html5lib,mutagen,coverart,yt-dlp]'
+    # required and optional dependencies (as user)
+    python3 -m pip install --user '.[eyed3,gui,html5lib,mutagen,coverart,yt-dlp]'
+
     # Optional: Create desktop icon
     python3 tools/create-desktop-icon.py
 
-    # Windows and Mac need the fake dbus module
+    # Windows and Mac: add the fake debus module to the python path
     export PYTHONPATH=./tools/fake-dbus-module/
 
     # To directly launch from command line
     bin/gpo                               # cli client
     bin/gpodder                           # gtk3 client
 
+The next time you wish to run gPodder, do the following:
+
+    cd gpodder
+
+    # if using a virtual environment
+    source ./.venv/bin/activate
+
+    # if on Windows or Mac
+    export PYTHONPATH=./tools/fake-dbus-module/
+
+    ./bin/gpodder
+
 ## Updating
 
     cd gpodder