#!/bin/bash

#    This file is intended to be run as:
#
#       bash <(curl https://cryptonomic.net/dotfiles.sh)
#
#    It clones and then installs my dotfiles via
#    git clone d@cryptonomic.net:public_git/dotfiles.git

(
set -e
as_root()
{
        if [ "$(id -u)" = 0 ]
        then
                "$@"
        else
                sudo "$@"
        fi
}

check_dep()
{
        if ! [ "$(command -v "$1")" ]
        then
                DEPS="$DEPS $2"
        fi
}
DEPS=

# make git retry on ssh errors (presumed to be network errors).
git_retry()
{
        OUR_TEMPDIR=$(mktemp -d) || exit
        GIT_SSH_COMMAND=$OUR_TEMPDIR/git_ssh_command
        GIT_SSH_COMMAND_RESULT=$OUR_TEMPDIR/result
        printf '%s\n' \
               '#!/bin/sh' \
               'ssh "$@"; r=$?; echo $r > $GIT_SSH_COMMAND_RESULT; exit $r' \
                > "$GIT_SSH_COMMAND"
        chmod +x $GIT_SSH_COMMAND
        export GIT_SSH_COMMAND GIT_SSH_COMMAND_RESULT
        SLEEP=1
        while ! git "$@"
        do
                read result < "$GIT_SSH_COMMAND_RESULT"
                [ "$result" = 255 ] || break
                sleep $SLEEP
                SLEEP=$((SLEEP + 1))
        done
}

check_dep ssh-keygen ssh-client
check_dep git git

if [ "$DEPS" ]
then
        as_root apt install $DEPS
fi

[ -d ~/.ssh ] || mkdir ~/.ssh
[ -e ~/.ssh/id_ed25519.pub ] || ssh-keygen -t ed25519 -f ~/.ssh/id_ed25519 -N ''

if ! [ -d dotfiles ]
then
        git_retry clone --recurse-submodules d@cryptonomic.net:public_git/dotfiles.git
        cd dotfiles
else
        cd dotfiles
        git pull --ff-only
fi

make diff
read -p 'Install dotfiles (will overwrite your existing dotfiles)? [y/N]> '
case "$REPLY" in
        [yY]) make install ;;
esac

)