Add prefix for all commands in documentation (#2877)

* Add prefix for commands in docs

* Add prefix for commands in example's README

docs/tutorial/database.rst

@@ -204,7 +204,7 @@ Run the ``init-db`` command:
 
 .. code-block:: none
 
-    flask init-db
+    $ flask init-db
     Initialized the database.
 
 There will now be a ``flaskr.sqlite`` file in the ``instance`` folder in

docs/tutorial/deploy.rst

@@ -21,7 +21,7 @@ is installed first:
 
 .. code-block:: none
 
-    pip install wheel
+    $ pip install wheel
 
 Running ``setup.py`` with Python gives you a command line tool to issue
 build-related commands. The ``bdist_wheel`` command will build a wheel
@@ -29,7 +29,7 @@ distribution file.
 
 .. code-block:: none
 
-    python setup.py bdist_wheel
+    $ python setup.py bdist_wheel
 
 You can find the file in ``dist/flaskr-1.0.0-py3-none-any.whl``. The
 file name is the name of the project, the version, and some tags about
@@ -41,7 +41,7 @@ file with ``pip``.
 
 .. code-block:: none
 
-    pip install flaskr-1.0.0-py3-none-any.whl
+    $ pip install flaskr-1.0.0-py3-none-any.whl
 
 Pip will install your project along with its dependencies.
 
@@ -50,8 +50,8 @@ create the database in the instance folder.
 
 .. code-block:: none
 
-    export FLASK_APP=flaskr
-    flask init-db
+    $ export FLASK_APP=flaskr
+    $ flask init-db
 
 When Flask detects that it's installed (not in editable mode), it uses
 a different directory for the instance folder. You can find it at
@@ -70,7 +70,7 @@ You can use the following command to output a random secret key:
 
 .. code-block:: none
 
-    python -c 'import os; print(os.urandom(16))'
+    $ python -c 'import os; print(os.urandom(16))'
 
     b'_5#y2L"F4Q8z\n\xec]/'
 
@@ -99,7 +99,7 @@ first install it in the virtual environment:
 
 .. code-block:: none
 
-    pip install waitress
+    $ pip install waitress
 
 You need to tell Waitress about your application, but it doesn't use
 ``FLASK_APP`` like ``flask run`` does. You need to tell it to import and
@@ -107,7 +107,7 @@ call the application factory to get an application object.
 
 .. code-block:: none
 
-    waitress-serve --call 'flaskr:create_app'
+    $ waitress-serve --call 'flaskr:create_app'
 
     Serving on http://0.0.0.0:8080
 

docs/tutorial/factory.rst

@@ -30,7 +30,7 @@ directory should be treated as a package.
 
 .. code-block:: none
 
-    mkdir flaskr
+    $ mkdir flaskr
 
 .. code-block:: python
     :caption: ``flaskr/__init__.py``
@@ -138,25 +138,25 @@ For Linux and Mac:
 
 .. code-block:: none
 
-    export FLASK_APP=flaskr
-    export FLASK_ENV=development
-    flask run
+    $ export FLASK_APP=flaskr
+    $ export FLASK_ENV=development
+    $ flask run
 
 For Windows cmd, use ``set`` instead of ``export``:
 
 .. code-block:: none
 
-    set FLASK_APP=flaskr
-    set FLASK_ENV=development
-    flask run
+    > set FLASK_APP=flaskr
+    > set FLASK_ENV=development
+    > flask run
 
 For Windows PowerShell, use ``$env:`` instead of ``export``:
 
 .. code-block:: none
 
-    $env:FLASK_APP = "flaskr"
-    $env:FLASK_ENV = "development"
-    flask run
+    > $env:FLASK_APP = "flaskr"
+    > $env:FLASK_ENV = "development"
+    > flask run
 
 You'll see output similar to this:
 

docs/tutorial/install.rst

@@ -80,7 +80,7 @@ Use ``pip`` to install your project in the virtual environment.
 
 .. code-block:: none
 
-    pip install -e .
+    $ pip install -e .
 
 This tells pip to find ``setup.py`` in the current directory and install
 it in *editable* or *development* mode. Editable mode means that as you
@@ -91,7 +91,7 @@ You can observe that the project is now installed with ``pip list``.
 
 .. code-block:: none
 
-    pip list
+    $ pip list
 
     Package        Version   Location
     -------------- --------- ----------------------------------

docs/tutorial/layout.rst

@@ -5,8 +5,8 @@ Create a project directory and enter it:
 
 .. code-block:: none
 
-    mkdir flask-tutorial
-    cd flask-tutorial
+    $ mkdir flask-tutorial
+    $ cd flask-tutorial
 
 Then follow the :doc:`installation instructions </installation>` to set
 up a Python virtual environment and install Flask for your project.

docs/tutorial/tests.rst

@@ -28,7 +28,7 @@ Install them both:
 
 .. code-block:: none
 
-    pip install pytest coverage
+    $ pip install pytest coverage
 
 .. _pytest: https://pytest.readthedocs.io/
 .. _coverage: https://coverage.readthedocs.io/
@@ -510,7 +510,7 @@ the test functions you've written.
 
 .. code-block:: none
 
-    pytest
+    $ pytest
 
     ========================= test session starts ==========================
     platform linux -- Python 3.6.4, pytest-3.5.0, py-1.5.3, pluggy-0.6.0
@@ -532,13 +532,13 @@ to run pytest instead of running it directly.
 
 .. code-block:: none
 
-    coverage run -m pytest
+    $ coverage run -m pytest
 
 You can either view a simple coverage report in the terminal:
 
 .. code-block:: none
 
-    coverage report
+    $ coverage report
 
     Name                 Stmts   Miss Branch BrPart  Cover
     ------------------------------------------------------
@@ -553,7 +553,7 @@ An HTML report allows you to see which lines were covered in each file:
 
 .. code-block:: none
 
-    coverage html
+    $ coverage html
 
 This generates files in the ``htmlcov`` directory. Open
 ``htmlcov/index.html`` in your browser to see the report.