#!/usr/bin/env bash
# vim:ft=bash:sw=4:ts=4:et:
# (requiring /bin/bash because Solaris' /bin/sh sucks)

# TODO -- add trapping of INT signal, moves renamed dir back to ~/.zsh

#--------------------------------------------------------------------------
# bootstrap installation for Ian's shell environment
#--------------------------------------------------------------------------

# feedback functions
Msg () {
    echo " * $*"
}
Die () {
    echo " * $*"
    exit 1
}

# helper functions
do_symlinks () {
    Msg "Symlinking new .zshrc and .zprofile"
    for i in $HOME/.zsh/_*.zsh; do
        ln -sf "$i" "$HOME/$(echo $i | perl -lpe's{.+/_(.+)\.zsh}{.$1}')"
    done
    Msg "Local installation finished."
}

do_install () {
    host='ian@am.orpho.us'
    dotfiles='
        .zsh
        .vim
        .screenrc
        .ssh/config
        .subversion/{config,servers}
        .cvs{rc,ignore}
        .w3m/keymap
        .Xdefaults
        .irbrc
    '

    Msg "Moving existing .zsh directory out of the way"
    old="$HOME/OLD-ZSH-DIR-TO-DELETE"
    if [ -d "$HOME/.zsh" ]; then
        mv "$HOME/.zsh" $old
    fi

    Msg "Downloading files from $host"
    (
        cd
        # some `tar' binaries don't like stdin
        f=".zsh-TEMP-INSALL.$$"
        touch $f
        chmod 0600 $f
        ssh $host tar -cz --exclude=.svn $dotfiles >$f
        tar -xzf $f
        rm $f
    )

    do_symlinks;

    Msg "Linking .vimrc and .gvimrc"
    for i in vimrc gvimrc; do
        ln -sf "$HOME/.vim/$i" "$HOME/.$i"
    done

    Msg "Touch .{g,}vimlocal"
    touch ~/.{g,}vimlocal

    # we have to do a secondary delete later on because of NFS syncing
    Msg "Will remove existing .zsh directory in a few seconds"
    rm -rf $old
    (sleep 10 && rm -rf $old) &

    if [ -r ~/.bootstrap-post.sh ]; then
        Msg "Running bootstrap post-install script"
        . ~/.bootstrap-post.sh
    fi

    Msg "Installation finished."
}

# parse command line arguments and do stuff
if [ "$1" = "-l" ]; then
    do_symlinks
    exit
elif [ $# = 0 ]; then
    if [ "$(hostname)" = "am"  ]; then
        Die "Can't run bootstrap on our source host!"
    else
        do_install
    fi
else
    echo <<END_USAGE
usage: $0 [ -l ]
options:
    -l      don't scp any files, just do symlinks
END_USAGE
    exit 1
fi