# If not running interactively, don't do anything
[[ $- != *i* ]] && return

is_ssh() {
	if [ -n "$SSH_CLIENT" ] || [ -n "$SSH_CONNECTION" ] || [ -n "$SSH_TTY" ]; then
		return 0
	else
		return 1
	fi
}

# Signal to some programs that vi is the editor that should be launched.
export EDITOR=vim

# Set shell keybindings to vi
set -o vi

#
# The dotfile directory; used by sd()
#
export DOTDIR="$HOME/Dotfiles"

#
# Local user software. Add software to the software directory
# and its bin directory will be automatically loaded when a shell
# is launched.
#
SOFTWARE="$HOME/Software"

# Add some extra directories to the PATH
PATH="$HOME/bin:$PATH"
export PATH HOME TERM

# Store the original path because if scansoft is called, it rebuilds
# the path, starting with the original path.
PATH_BAK="$PATH"

available() {
    type $1 > /dev/null 2>&1
    return $?
}

scansoft() {
        PATH="$PATH_BAK"
        if [ ! -d "$SOFTWARE" ]; then
            mkdir -p "$SOFTWARE"
        else
            # Sort -n to sort entries numerically (to allow precedence)
            for D in `find "$SOFTWARE" -maxdepth 1 -type d | sort -n`; do
		    if [ -d "$D/bin" ]; then
			echo "Include '$(basename $D)'"
			export PATH="$D/bin:$PATH"
		    fi
            done
        fi
}

ensoft() {
        if [ -z "$1" ]; then
                echo "Usage: ensoft <dir>"
                return
        fi
	if [ -d "$SOFTWARE/$1" ]; then
		if [ -d "$SOFTWARE/$1/_bin" ]; then
			echo "Enabling '$1'..."
			mv "$SOFTWARE/$1/_bin" "$SOFTWARE/$1/bin"
			echo "Enabled. Run 'scansoft' to apply changes."
		elif [ -d "$SOFTWARE/$1/bin" ]; then
			echo "Already enabled."
		else
			echo "'$1' exists, but is not a software directory."
		fi
	else
		echo "'$1' does not exist in the software directory."
	fi
}

disoft() {
        if [ -z "$1" ]; then
                echo "Usage: disoft <dir>"
                return
        fi
	if [ -d "$SOFTWARE/$1" ]; then
		if [ -d "$SOFTWARE/$1/bin" ]; then
			echo "Disabling '$1'..."
			mv "$SOFTWARE/$1/bin" "$SOFTWARE/$1/_bin"
			echo "Disabled. Run 'scansoft' to apply changes."
		elif [ -d "$SOFTWARE/$1/_bin" ]; then
			echo "Already disabled."
		else
			echo "'$1' exists, but is not a software directory."
		fi
	else
		echo "'$1' does not exist in the software directory."
	fi
}

mod_time() {
    if [ -n "$1" ] && [ -f "$1" ]; then
        case "$(uname)" in
            Linux) stat -c %Y "$1";;
            *BSD) stat -f %m "$1";; 
            *) echo "0";; # Force compilation every time.
        esac
    else
        echo "0"
    fi
}

#
# Dotfile Syncing - If changes are made to any of my dotfiles in git, they're
# synced to the home directory.
#

sd() {
	if [ -z "$DOTDIR" ]; then
		echo "sd: No dotfile directory specified. Please define \$DOTDIR."
		return 1
	fi

	if [ ! -d "$DOTDIR" ]; then
		echo "sd: The dotfile directory '$DOTDIR' does not exist."
		return 1
	fi

	find "$DOTDIR" -type f -not -path "$DOTDIR/.git/*" \
		-not -name '*.md' -not -name '*.swp' \
		-not -path '*CVS*' -not -name '.#*' \
		| while IFS= read -r listing; do
		local="$HOME/$(echo "$listing" | sed "s|$DOTDIR/||g")"
		docopy=0
		if [ -f "$local" ]; then
			diff -N "$listing" "$local" > /dev/null
			docopy=$?
		else
			docopy=1
		fi
		if [ $docopy -eq 1 ]; then
			localmtime=$(mod_time "$local" 2> /dev/null)
			if [ -z "$localmtime" ]; then
				localmtime=0
			fi
			listingmtime=$(mod_time "$listing" 2> /dev/null)
			if [ -z "$listingmtime" ]; then
				listingmtime=0
			fi
			if [ $listingmtime -gt $localmtime ]; then
				dir=$(dirname "$local")
				if [ ! -d "$dir" ]; then
					mkdir -p "$dir"
					echo "Created directory '$dir'."
				fi
				cp -v "$listing" "$local"
			else
				cp -v "$local" "$listing"
			fi
		fi
	done
}

#
# Shell Prompt
#

# ANSI Colors - Used for Prompt
ANSI_RESET="\[\033[0m\]"       # reset
ANSI_HICOLOR="\[\033[1m\]"     # hicolor
ANSI_UNDERLINE="\[\033[4m\]"   # underline
ANSI_INVERT="\[\033[7m\]"      # inverse background and foreground
ANSI_BLACK="\[\033[30m\]"      # foreground black
ANSI_RED="\[\033[31m\]"        # foreground red
ANSI_GREEN="\[\033[32m\]"      # foreground green
ANSI_YELLOW="\[\033[33m\]"     # foreground yellow
ANSI_BLUE="\[\033[34m\]"       # foreground blue
ANSI_MAGENTA="\[\033[35m\]"    # foreground magenta
ANSI_CYAN="\[\033[36m\]"       # foreground cyan
ANSI_FWHT="\[\033[37m\]"       # foreground white
ANSI_WHITE="\[\033[40m\]"      # background black
ANSI_BG_RED="\[\033[41m\]"     # background red
ANSI_BG_GREEN="\[\033[42m\]"   # background green
ANSI_BG_YELLOW="\[\033[43m\]"  # background yellow
ANSI_BG_BLUE="\[\033[44m\]"    # background blue
ANSI_BG_MAGENTA="\[\033[45m\]" # background magenta
ANSI_BG_CYAN="\[\033[46m\]"    # background cyan
ANSI_BG_WHITE="\[\033[47m\]"   # background white

trim() {
	awk '{print $1}'
}

generate_prompt() {
	LAST_EXIT=$?

	printf "\n%s" "$ANSI_HICOLOR"
	printf "%s " "$(date '+%Y-%m-%d %H:%M')"

	if [ "$(git rev-parse --is-inside-work-tree 2> /dev/null)" = "true" ]; then
		printf ' %s(%s)' "$ANSI_YELLOW" "$(git rev-parse --abbrev-ref HEAD)"
	fi

	printf "%s\n" "$ANSI_RESET"

	printf "%s" "$ANSI_GREEN"
	printf "%s" "$USER"
	printf "%s" "$ANSI_RESET"

	printf "@"

	printf "%s" "$ANSI_GREEN"
	printf "%s" "$(hostname -s)"
	printf "%s" "$ANSI_RESET"

	printf ":"
	printf "%s" "$ANSI_HICOLOR"

	DIR=$(echo $PWD | sed "s|$HOME|~|g")

	printf "%s" "$DIR"
	
	printf "%s\n" "$ANSI_RESET"

	if [ "$LAST_EXIT" != "0" ]; then
		printf "%s(%s)%s " "$ANSI_RED" "$LAST_EXIT" "$ANSI_RESET"
	fi

	if [ "$(whoami)" = "root" ]; then
		printf "# "
	else
		printf "$ "
	fi
}

PS1="\$(generate_prompt)"

#
# Startup functions - these are executed on every shell start.
#

# Run scansoft on shell start
scansoft

if [ -f "$HOME/.aliases" ]; then
	. "$HOME/.aliases"
fi