#!/usr/bin/env bash

#
# Author: Tom Ryder (@tejr) <tom@sanctum.geek.nz>
#
# This script installs @tejr's dotfiles in $HOME with symlinks into the
# expected $HOME/.dotfiles path.
#
# By default, it checks out all Git submodules, and links in configuration for
# Bash, cURL, Git, Vim, and some terminfo(5) definitions. You can supply
# additional flags to link in other configuration files:
#
#   -d -- mysql/psql
#   -g -- GnuPG
#   -m -- Mutt
#   -n -- Ncmpcpp
#   -r -- Newsbeuter
#   -t -- tmux
#   -x -- X11
#
# You should be prompted about replacing any file or directory that already
# exists. I have tried to make the function that does this relatively safe, but
# there are almost certainly edge cases where it might break things, especially
# on systems other than GNU/Linux or BSD.
#
# Run this at your own risk!
#   

# Replace existing file with link if user confirms
lns() {
    local file=$1 link=$2
    if [[ -e $link ]]; then
        read -p "$link already exists; remove? [y/N] " confirm
        case $confirm in
            y*|Y*) 
                rm -r -- "$link"
                ln -s -- "$file" "$link"
                return
                ;;
            *)
                return 1
                ;;
        esac
    else
        ln -s -- "$file" "$link"
    fi
    return
}

# Bail if we don't have git(1)
if ! hash git 2>/dev/null; then
    printf 'install: Could not find git(1)!\n' >&2
    exit 1
fi

# Define dotfiles directory and check it exists
dotfiles=$HOME/.dotfiles
if ! [[ -d $dotfiles ]]; then
    printf 'install: Could not find %s!\n' "$dotfiles" >&2
    exit 1
fi

# Check out submodules
(cd -- "$dotfiles" && git submodule update --init)

# Link in essential logical binaries
mkdir -p -- "$HOME"/.local/bin
lns "$dotfiles"/ack/ack "$HOME"/.local/bin/ack

# Link in essential configuration files
mkdir -p -- "$HOME"/.config
lns "$dotfiles"/ack/ackrc            "$HOME"/.ackrc
lns "$dotfiles"/bash/bash_completion "$HOME"/.config/bash_completion
lns "$dotfiles"/bash/bash_logout     "$HOME"/.bash_logout
lns "$dotfiles"/bash/bash_profile    "$HOME"/.bash_profile
lns "$dotfiles"/bash/bashrc          "$HOME"/.bashrc
lns "$dotfiles"/bash/bashrc.d        "$HOME"/.bashrc.d
lns "$dotfiles"/curl/curlrc          "$HOME"/.curlrc
lns "$dotfiles"/git/gitconfig        "$HOME"/.gitconfig
lns "$dotfiles"/readline/inputrc     "$HOME"/.inputrc
lns "$dotfiles"/sh/profile           "$HOME"/.profile
lns "$dotfiles"/sh/profile.d         "$HOME"/.profile.d
lns "$dotfiles"/vim/vimrc            "$HOME"/.vimrc
lns "$dotfiles"/vim                  "$HOME"/.vim

# Link in shell stuff
while getopts :dgmnrtx opt; do
    case $opt in
        d)
            lns "$dotfiles"/mysql/my.cnf "$HOME"/.my.cnf
            lns "$dotfiles"/psql/psqlrc  "$HOME"/.psqlrc
            ;;
        g)
            mkdir -p -- "$HOME"/.gnupg
            lns "$dotfiles"/gnupg/gpg.conf       "$HOME"/.gnupg/gpg.conf
            lns "$dotfiles"/gnupg/gpg-agent.conf "$HOME"/.gnupg/gpg-agent.conf
            ;;
        m)
            lns "$dotfiles"/mutt/muttrc "$HOME"/.muttrc
            lns "$dotfiles"/mutt        "$HOME"/.mutt
            ;;
        n)
            lns "$dotfiles"/ncmpcpp "$HOME"/.ncmpcpp
            ;;
        r)
            mkdir -p -- "$HOME"/.config "$HOME"/.local/share/newsbeuter
            lns "$dotfiles"/newsbeuter "$HOME"/.config/newsbeuter
            ;;
        t)
            lns "$dotfiles"/tmux/tmux.conf "$HOME"/.tmux.conf
            ;;
        x)
            lns "$dotfiles"/i3           "$HOME"/.i3
            lns "$dotfiles"/X/Xmodmap    "$HOME"/.Xmodmap
            lns "$dotfiles"/X/Xresources "$HOME"/.Xresources
            lns "$dotfiles"/X/xsession   "$HOME"/.xsession
            lns "$dotfiles"/X/xsessionrc "$HOME"/.xsessionrc
            lns "$dotfiles"/vim/gvimrc   "$HOME"/.gvimrc
            ;;
    esac
done
shift $((OPTIND-1))

# Compile terminfo files
if hash tic 2>/dev/null; then
    for info in "$dotfiles"/terminfo/*.info; do
        tic "$info"
    done
fi