dotctl

#!/usr/bin/env bash

set -eu
set -o pipefail

# Copy a file if it does not exist
# Skip if the diff is empty
# Interactively resolve the diff if needed
dotctl_vimdiff() {
	if [[ "${#}" -ne 2 ]]; then
		exit 1
	fi
	if [[ ! -e "${1}" ]]; then
		echo "[+] Installing ${2} to ${1}..."
		cp -i "${2}" "${1}"
		return
	fi

	if [[ -z "$(diff "${1}" "${2}")" ]]; then
		echo "[+] Skippping (empty diff) ${1}"
	else
		echo "[+] Updating ${1}..."
		vimdiff "${1}" "${2}"
	fi
}

# Diff files from this repo with the ones in $HOME
dotctl_diff() {
	# Diff configuration files prefixed by a '.' in $HOME
	for f in 'bashrc' 'zshrc' 'tmux.conf' 'vimrc' 'colordiffrc' 'digrc'; do
		dotctl_vimdiff "${HOME}/.${f}" "${f}"
	done

	# Diff configuration files in $HOME/.shell/
	for f in 'shell/'*.{sh,bash,zsh}; do
		dotctl_vimdiff "${HOME}/.shell/$(basename "${f}")" "${f}"
	done

	# Diff configuration files in $HOME/.config directories
	for f in 'git/'*; do
		dotctl_vimdiff "${HOME}/.config/git/$(basename "${f}")" "${f}"
	done
}

# Initial installation on a fresh system
dotctl_install() {
	# Use any argument to bypass this check
	if [[ "${#}" -ne 1 ]]; then
		echo 'READ ME before blindly launching me!!'
		exit 1
	fi

	# Git config directory setup
	mkdir -p "${HOME}/.config/git"

	# Shell setup
	mkdir -p "${HOME}/.shell/history"

	pushd "${HOME}/.shell/" > /dev/null
	curl -Sso 'dircolors.256dark' \
		'https://raw.githubusercontent.com/seebi/dircolors-solarized/master/dircolors.256dark'
	if [[ ! -d 'zsh-syntax-highlighting' ]]; then
		git clone 'https://github.com/zsh-users/zsh-syntax-highlighting.git'
	fi
	popd > /dev/null

	# Vim setup
	for d in 'autoload' 'bundle' 'backup' 'undodir'; do
		mkdir -p "${HOME}/.vim/${d}"
	done

	# Install pathogen plugin
	curl -Sso "${HOME}/.vim/autoload/pathogen.vim" \
		'https://raw.githubusercontent.com/tpope/vim-pathogen/master/autoload/pathogen.vim'

	pushd "${HOME}/.vim/bundle/" > /dev/null
	# bogado/file-line: Open a file and go to specified line using <filename>:<line>
	# tpope/vim-fugitive: a Git wrapper so awesome, it should be illegal
	# tpope/vim-markdown: Vim Markdown runtime files
	# tpope/vim-git: Vim Git runtime files
	# altercation/vim-colors-solarized: precision colorscheme for the vim text editor
	# ciaranm/securemodelines: A secure alternative to Vim modelines
	# tpope/vim-commentary: comment stuff out
	# dahu/SearchParty: Extended search commands and maps for Vim
	# dahu/vim-fanfingtastic: Find a char across lines
	# tpope/vim-repeat: enable repeating supported plugin maps with "."
	# scrooloose/syntastic: Syntax checking hacks for vim
	# tpope/vim-surround: quoting/parenthesizing made simple
	# wting/rust.vim: Rust support
	# tpope/vim-unimpaired: pairs of handy bracket mappings
	# fatih/vim-go: Go development plugin for Vim
	# editorconfig/editorconfig-vim: Editor Config support
	plugins=(
		'https://github.com/bogado/file-line.git'
		'https://github.com/tpope/vim-fugitive.git'
		'https://github.com/tpope/vim-markdown.git'
		'https://github.com/tpope/vim-git.git'
		'https://github.com/altercation/vim-colors-solarized.git'
		'https://github.com/ciaranm/securemodelines.git'
		'https://github.com/tpope/vim-commentary.git'
		'https://github.com/dahu/SearchParty.git'
		'https://github.com/dahu/vim-fanfingtastic.git'
		'https://github.com/tpope/vim-repeat.git'
		'https://github.com/scrooloose/syntastic.git'
		'https://github.com/tpope/vim-surround.git'
		'https://github.com/wting/rust.vim.git'
		'https://github.com/tpope/vim-unimpaired.git'
		'https://github.com/fatih/vim-go.git'
		'https://github.com/editorconfig/editorconfig-vim.git'
	)
	for p in "${plugins[@]}"; do
		if [[ ! -d ${p##*/} ]]; then
			git clone "${p}"
		fi
	done
	popd > /dev/null

	# Update all other dotfiles
	dotctl_diff
}

# Update all Git clone plugins and additions then diff config files
dotctl_update() {
	pushd "${HOME}/.vim/bundle" > /dev/null
	for b in *; do
		pushd "${b}" > /dev/null
		echo "[+] Updating ${b}..."
        # Update failures are not fatal
        git pull origin || echo "[!] Failed to update ${b}"
		popd > /dev/null
	done
	popd > /dev/null

	pushd "${HOME}/.shell" > /dev/null
	for d in "zsh-syntax-highlighting"; do
		if [[ -d "${d}" ]]; then
			pushd "${d}" > /dev/null
			echo "[+] Updating ${d}..."
            # Update failures are not fatal
			git pull origin || echo "[!] Failed to update ${d}"
			popd > /dev/null
		fi
	done
	popd > /dev/null

	# Update all other dotfiles
	dotctl_diff
}

dotctl_help() {
	>&2 echo "Install and update dotfiles"
	>&2 echo ""
	>&2 echo "USAGE:"
	>&2 echo "    dotctl [SUBCOMMAND]"
	>&2 echo ""
	>&2 echo "SUBCOMMANDS:"
	>&2 echo "    install     Install Bash, Zsh, Vim, Git, etc. configs"
	>&2 echo "    update      Update Vim plugins and Zsh highligh Git repos"
	>&2 echo "    diff        Diff and update dotfiles"
}

main() {
	if [[ "${#}" -eq 0 ]]; then
		dotctl_help
		return
	fi

	case "${1}" in
		"d" | "diff")
			dotctl_diff ;;
		"u" | "update")
			dotctl_update ;;
		"i" | "install")
			dotctl_install "${@}";;
		*)
			>&2 echo "Uknown command!"
			dotctl_help
			exit 1 ;;
	esac

	echo "[+] Done!"
}

main "${@}"