#!/usr/bin/env bash
#
# Script to set up dotfiles repository and run installer.
#
# Installs git using apt-get if not in $PATH.
# Pulls latest dotfiles repository.
#
#
# Usage:
#
#   i. Run in new bash shell.
#
#       $ bash bootstrap.sh
#       $ bash /path/to/bootstrap.sh
#       $ wget path.to/bootstrap.sh -qO - | bash
#
#   ii.  Source into existing bash shell.
#
#       $ source bootstrap.sh
#       $ source /path/to/bootstrap.sh
#       $ source <(wget -q path.to/bootstrap.sh)
#
#
# Configuration:
#
#   $REPOSITORY - GitHub repository to clone
#                 @default "andrejusk/dotfiles"
#
#   $WORKSPACE  - parent directory to clone repository into
#                 @default "$HOME/workspace"
#
#   $INSTALLER  - installer file name
#                 @default "install.sh"
#
#   $FAST_MODE  - whether to skip git (and speed up install steps)
#                 @defualt unset
#
#
set -o pipefail
echo "setting up..."

# Variables: $REPOSITORY
if [ -z "$REPOSITORY" ]; then
    REPOSITORY="andrejusk/dotfiles"
fi
readonly repository_url="git@github.com:$REPOSITORY.git"
echo "using repository: $repository_url"

# Variables: $WORKSPACE
if [ -z "$WORKSPACE" ]; then
    WORKSPACE="$HOME/workspace"
fi
readonly dotfiles_dir="$WORKSPACE/dotfiles"
echo "using dir: $dotfiles_dir"

# Variables: $INSTALLER
if [ -z "$INSTALLER" ]; then INSTALLER="install.sh"; fi
readonly installer="$dotfiles_dir/$INSTALLER"
echo "using installer: $installer"

# Pull latest git if not skipped
if [ -z "$FAST_MODE" ]; then

    # Ensure git is installed
    if ! [ -x "$(command -v git)" ]; then
        echo "installing git..."
        sudo apt-get update -qqy
        sudo apt-get install git -qqy
    fi

    # Ensure latest is pulled
    echo "pulling latest..."
    if [[ ! -d $dotfiles_dir ]]; then
        mkdir -p "$dotfiles_dir"
        git clone -q "$repository_url" "$dotfiles_dir"
    else
        git --git-dir="$dotfiles_dir/.git" fetch -q
        git --git-dir="$dotfiles_dir/.git" rebase -q --autostash FETCH_HEAD
    fi

fi

# Install dotfiles
cd "$dotfiles_dir"
source "$installer"
echo "done!"