.files/install

#!/bin/zsh
# .files/installer
# (c) 2014 MORI Taeyeon

# Paths & Utils
DOT="$(realpath "$(dirname "$0")")"
cd "$DOT"

setopt EXTENDED_GLOB
source "$DOT/lib/libzsh-utils.zsh"

# Parse commandline
OVERWRITE=false
ASK=true

function print_usage() {
    echo "Usage: $1 [--help] [--overwrite] [--dont-ask]"
    echo
    echo "Install Tae's dotfiles"
    echo
    echo "Parameters:"
    echo "    -h, --help    Display this help message"
    echo "    --overwrite   Just overwrite existing dotfiles"
    echo "    --dont-ask    Don't ask questions. Use default values"
}

for arg in "$@"; do
    [[ -z "$STATE" ]] && {
        case "$arg" in
            -h|--help) print_usage "$0"; exit 0;;
            --overwrite) OVERWRITE=true;;
            --dont-ask) ASK=false;;
            *) print_usage "$0"; exit 1;;
        esac
    } || {
        case "$STATE" in
            # handle options with parameters
        esac
        STATE=
    }
done
[[ -n "$STATE" ]] && err "Option $STATE is missing it's parameter!" && exit 1

# Helper functions
function generate() {
    [[ -e "$1" ]] && ! $OVERWRITE && ! grep -q "Generated by .files/install" "$1" && \
        err "Custom version of $1 detected. Please delete it before running .files/install" && exit 1
    echo "${2-#} Generated by .files/install" >"$1"
    echo "${2-#} `date "+%m/%d/%Y %H:%M:%S"`" >>"$1"
    echo >>"$1"
    cat >>"$1"
}

function relink() {
    [[ ! -e "$1" ]] && err "No such file or directory: '$1'" && return 1
    [[ -L "$2" ]] && rm -f "$2"
    [[ -e "$2" ]] && ! $OVERWRITE && err "File already exists and isn't a symbolic link: '$2'" && return 1
    color 31 ln -s "$(relpath "$1" "$(dirname "$2")")" "$2"
}

# Update git modules
msg "Updating git submodules..."
git submodule update --init --recursive

# Ask questions about user
$ASK && msg "Asking questions..." || err "Not asking any questions:"

[[ -e "$DOT/etc/user-info" ]] && source "$DOT/etc/user-info"

[[ -z "$REALNAME" ]] && REALNAME=`grep "^$USER:[^:]*:$UID:" /etc/passwd | cut -d: -f5 | cut -d, -f1`

if $ASK; then
    ask "  Real name" REALNAME
    ask "  E-Mail address" EMAIL
else
    color 36 echo "  default REALNAME=\"$REALNAME\""
    color 36 echo "  default EMAIL=\"$EMAIL\""
fi

color 32 echo "  Writing etc/user-info"
generate "$DOT/etc/user-info" <<EOF
REALNAME="$REALNAME"
EMAIL="$EMAIL"
EOF

# Setup dotfiles
msg "Linking dotfiles..."
for file in "$DOT/dotfiles"/*; do
    NAM="${file:t}"
    color 32 echo "  Adding .$NAM"
    relink "$file" "$HOME/.$NAM"
done

# Setup .config
: ${XDG_CONFIG_HOME:=~/.config}
msg "Linking .config files... ($XDG_CONFIG_HOME)"
(
    cd "$DOT/config"
    for dir in $(find . -type d); do
        if [ ! -d "$XDG_CONFIG_HOME/$dir" ]; then
            color 32 echo "  Creating ${dir:2}"
            mkdir "$XDG_CONFIG_HOME/$dir"
        fi
    done
    for file in $(find . -type f); do
        file="${file:2}"
        color 32 echo "  Adding $file"
        relink "$DOT/config/$file" "$XDG_CONFIG_HOME/$file"
    done
);

# Setup git
msg "Setting up Git configuration..."

GIT="$DOT/git"
[[ -e "$HOME/.gitconfig" ]] && ! grep -q ".files/install" "$HOME/.gitconfig" && err "Custom ~/.gitconfig already exists! Please remove it before running .files/install" && exit 1

color 32 echo "  Writing .gitconfig"
generate "$HOME/.gitconfig" <<EOF
[include]
    path = $(relpath "$GIT" "$HOME")/config
    path = $(relpath "$GIT" "$HOME")/user-info
EOF

[ "`uname -s`" = "Darwin" ] && \
cat >>"$HOME/.gitconfig" <<EOF
    path = $(relpath "$GIT" "$HOME")/osx
EOF

color 32 echo "  Writing git/user-info"
generate "$GIT/user-info" <<EOF
[user]
    name = $REALNAME
    email = $EMAIL
EOF

# Setup ZSH/Prezto
msg "Setting up ZSH configuration..."
ZSH="$DOT/zsh"

color 32 echo "  Writing .zshenv"
generate "$HOME/.zshenv" <<EOF
export DOTFILES="\$HOME/$(relpath "$DOT" "$HOME")"
ZDOTDIR="\$DOTFILES/zsh"
source "\$ZDOTDIR/zshenv"
EOF

for file in zshrc zpreztorc zlogin zlogout zprofile; do
    color 32 echo "  Adding .$file"
    relink "$ZSH/$file" "$ZSH/.$file"
done

relink "$ZSH/prezto" "$ZSH/.zprezto"

# Check login shell
if  getent passwd $(id -un) | grep -q 'zsh$'; then
    msg "Login shell is already set to zsh, you're good to go!"
else
    msg "Setting login shell to '$(which zsh)'..."
    chsh -s "$(which zsh)"
fi


warn "You may need to relog for all changes to take effect."
warn "If you're currently running zsh, you definitely need to at least restart the shell to apply changes."