# git exercise. Single developer and local repository.

# First move to a safe place:
cd /tmp/

# Run the 'git' command and read the output, its a useful summary.
git

# Ask git what it knows about the status of the current directory.
git status

# Introduce yourself to git (set the variables for name and email):
git config --global user.name "Nicola Chiapolini"
git config --global user.email "nicola.chiapolini@physik.uzh.ch"

# Verify that git has correctly stored your config (see 'git help config')
git config user.name
git config user.email
git config -l

# Create a directory for this exercise and enter it.
mkdir demo_git_single_local
cd demo_git_single_local

# Create a new git repository within the current directory.
git init

# Verify that you have a brand new ".git/" directory...
ls -al
# ...and its content.
ls -al .git/

# Check the status and compare the output to the one from last time
git status

# Create a file named hello.py that prints some salutation.
echo "print('hello.')" > hello.py

# Check the status and compare the output to the one from last time
git status

# Put hello.py in the staging area
git add hello.py
# and check how the status changes
git status

# Now record commit to the repository.
git commit -m "My first commit. A big step for the mankind."

# Check status again, it is instructive.
git status

# Edit hello.py some more.
echo "import numpy as np" >> hello.py
echo "print(np.random.rand(3))" >> hello.py

# See how the status changes accordingly.
git status

# Show the changes between current and staged files.
git diff

# Add changes into the staging area (index)...
git add hello.py
# and see how the status changes accordingly.
git status

# Edit hello.py again, e.g., adding another print statement.
echo "print(np.eye(4))" >> hello.py

# And again the status..
git status
# and the changes between the 3 different versions.
git diff
git diff --staged

# Commit *only* changes from the staging area.
git commit -m "print 3 random numbers."

# Verify that changes not added to the staging area were not recorded.
git diff

# Commit all changes in hello.py skipping the staging area.
git commit hello.py -m "Added beautiful eyes."

# Edit hello.py again and create a new file.
echo "print(42)" >> hello.py
echo "import time" > clock.py
echo "print(time.ctime())" >> clock.py

# Inspect the status and the changes.
git status
git diff

# Commit everything, skipping the staging area where possible.
git add clock.py
git commit -a -m "Add a swiss clock and improve hello.py."

# Check that you really commited everything.
git status

# See the logs of all commits.
git log

# See the logs of all commits with the git GUI.
qgit

# Go crazy and mess with your files. Remove files.
echo "printttt('I hate you...')" > hello.py
rm -f clock.py

# Oh no! What have you done! Shame! Verify status and changes.
git status
git diff

# Get rid of the last untracked changes
git checkout .

# Verify that everything is back to normal.
ls
git status
git diff

#Relax: your work is safe.

