#!/usr/bin/env bash

# SPDX-License-Identifier: 0BSD
# bash <(curl --proto '=https' --tlsv1.2 -sSf https://ftp.silversoft.se/git-setup.sh)

################################################################################
# Helper script to set up some sane defaults for git configuration.            #
################################################################################

echo -n "$(tput setaf 121)" && clear
cat <<EOF

   ██╗███╗   ███╗██████╗ ██╗   ██╗███████╗
   ██║████╗ ████║██╔══██╗██║   ██║██╔════╝
   ██║██╔████╔██║██████╔╝██║   ██║███████╗
   ██║██║╚██╔╝██║██╔══██╗██║   ██║╚════██║
   ██║██║ ╚═╝ ██║██████╔╝╚██████╔╝███████║
   ╚═╝╚═╝     ╚═╝╚═════╝  ╚═════╝ ╚══════╝
       Git Configuration Setup Script

   This script sets up some sane defaults for git configuration.
   Some of these are personal preferences, but most are generally
   useful. It is meant to be run once, and will overwrite any
   existing configuration.

EOF

echo -n "$(tput setaf 161)"
cat <<EOF
   This script will backup and replace your current git configuration!
   It is completely inert if you do not confirm the installation.
   It only touches the global git configuration, and nothing else.

EOF
echo -n "$(tput sgr0)" # Reset text color

################################################################################
################################################################################

# Unix timestamp for versioning backups.
timestamp=$(date +%s)

# Doing it this way might be useful for when git starts defaulting
# to storing its configuration files in ~/.config/git/config.
config_path=~/.gitconfig

# Function to check if a command exists, and exit if it does not.
assure_installed() {
    if ! command -v "$1" &> /dev/null
    then
        echo "$1 is not installed. Exiting..."
        exit 1
    fi
}

# Function to ask for confirmation with a message.
ask_confirmation() {
    read -p "$1 [y/N]: " -n 1 -r
    echo
    if [[ ! $REPLY =~ ^[Yy]$ ]]
    then
        echo "Aborting and exiting..."
        exit 1
    fi
}

# Check if git is installed
assure_installed git

# Ask if the user wants to continue
ask_confirmation "Install git configuration?"

# Backup the current git config if it exists.
echo "Backing up current git configuration..."
mv $config_path ~/.gitconfig_backup_"$timestamp"

# Get name and email from current git config
name=$(git config --global user.name)
email=$(git config --global user.email)

# This is bash magic to get the current user with the first
# letter in uppercase. This will be used as global user.name.
user=${USER^^${USER:0:1}}

# If the old name is not empty, we will use it.
if [ -n "$name" ]; then
    echo "Using current user name: $name"
    user=$name
fi

# Email here should be empty, which is desired, since
# we do not want our email in source control.
git config --global user.email "$email"
git config --global user.name "$user"

# These are sometimes a pain, given you need a valid ssh key for pulling.
# git config --global url.ssh://git@bitbucket.org/.insteadOf https://bitbucket.org/
# git config --global url.ssh://git@github.com/.insteadOf https://github.com/
# git config --global url.ssh://git@gitlab.com/.insteadOf https://gitlab.com/

# Set the default editor to neovim
git config --global core.editor nvim

# Set default pull to rebase and upstream
git config --global pull.rebase true
git config --global pull.default upstream

# Set default branch to master. Some prefer main.
# I use master for compatibility reasons.
git config --global init.defaultBranch master

# We want our dates to be relative
git config --global log.date relative

# Set autocorrect to prompt
# Makes it correct typos, but asks for confirmation
git config --global help.autoCorrect prompt

# Sort branches by committer date, not author date
# Will make ´git branch´ and ´git log --graph --oneline --all´ show branches
# in the order they were last committed to, not when they were created.
git config --global branch.sort -committerdate

# Sort `git tag` by semver, in descending order
git config --global tag.sort -version:refname

################################################################################
# Below are some settings aliases and pretty formats that I like to use.       #
################################################################################

# Beware of the space placement here, it is easy to mess up.

# Default pretty format for git log
git config --global format.pretty \
"format:%C(auto,yellow)%h%C(auto,magenta)% G? \
%C(auto,blue)%<(14,trunc)%ad %C(auto,green)%<(8,trunc)\
%aN%C(auto,reset)%s%C(auto,red)% gD% D"

# Set git alias 'l' for a pretty log with graph.
git config --global alias.l \
"log --date-order --date=iso --graph --full-history --all \
--pretty='format:\
%x08%x09%C(red)%h \
%C(cyan)%ad%x08%x08%x08%x08%x08%x08%x08%x08%x08%x08%x08%x08%x08%x08%x08 \
%C(bold blue)%<(8,trunc)%aN%C(reset)%C(bold yellow)%d %C(reset)%s'"

# Set git alias 's' for a pretty status
git config --global alias.s \
"status --short --branch --untracked-files --ahead-behind"

# Diff with stat
git config --global alias.d \
"diff --stat"

git config --global alias.hotspot \
    "!git log --name-only --pretty=format: | grep -v '^$' | sort | uniq -c | sort -nr | head"

git config --global alias.recent \
    "!git log --since='2 weeks ago' --name-only --pretty=format: | grep -v '^$' | sort | uniq -c | sort -nr"

git config --global alias.topfiles \
    "!git log --name-only --pretty=format: | grep -v '^$' | sort | uniq -c | sort -nr | head -n 10"

################################################################################
################################################################################

if [ -z "$email" ]; then
    email="<None> (Empty email in git config)"
fi

echo
echo "  | Configured identity:"
echo "  |    Name: $(git config --global user.name)"
echo "  |    Email: $email"
echo

echo -e "A backup of your old config was saved to \e[33m~/.gitconfig_backup_$timestamp\e[0m"
echo -e "You can view your new configuration with \e[33mgit config --global -l\e[0m"
echo -e "Your git configuration has been set up."
echo -e "\e[32mSuccess!\e[0m"