install

#!/usr/bin/env bash

NOLINK=0
uname -s | grep MINGW &>/dev/null && NOLINK=1

LINK='ln -s'
[ $NOLINK -ne 0 ] && LINK='cp -a'

etc="$HOME/etc"

if [ ! -d "$etc" ]; then
    echo ERROR: Configuration directory $etc not found - exiting.
    exit 1
fi

echo Updating dotfile links in $HOME from $etc

map="
    bash_profile:.bash_profile
    bashrc:.bashrc
    dosemurc:.dosemurc
    fonts.conf:.config/fontconfig/fonts.conf
    gdbinit:.gdbinit
    gitconfig:.gitconfig
    gtk.css:.config/gtk-3.0/gtk.css
    gtk-settings.ini:.config/gtk-3.0/settings.ini
    hgrc:.hgrc
    inputrc:.inputrc
    lldbinit:.lldbinit
    minttyrc:.minttyrc
    plan:.plan
    screenrc:.screenrc
    startxwinrc:.startxwinrc
    tmux.conf:.tmux.conf
    user-dirs.dirs:.config/user-dirs.dirs
    vimrc:.vimrc
    Xmodmap:.Xmodmap
    Xresources:.Xresources
    "

for f in $map; do
    src="$etc/$(echo "$f" | cut -d: -f1)"
    dst="$HOME/$(echo "$f" | cut -d: -f2)"

    if [ ! -f "$src" ]; then
        echo ERROR: Missing source file $src - exiting.
        exit 1
    fi

    dstdir=$(dirname "$dst")
    if [ "x$dstdir" != "x." -a ! -d "$dstdir" ]; then
        mkdir -p "$dstdir"
        if [ $? -ne 0 ]; then
            echo "ERROR: failed to make $dstdir"
            exit 1
        fi
    fi

    if [ -f "$dst" -a ! -L "$dst" ]; then
        if [ $NOLINK -ne 0 ]; then
            dstdiff="$dst.diff"
            diff -Naur "$dst" "$src" > $dstdiff
            if [ $? -ne 0 ]; then
                echo WARNING: $dst differs from $src - please merge
                echo
                cat "$dst.diff"
                echo
            fi
        else
            dstbak="$dst.bak"
            echo WARNING: Destination file $dst already exists and is not a link - moving it out of the way to $dstbak.
            mv "$dst" "$dstbak"
        fi
    fi

    if [ -L "$dst" ]; then
        cursrc=$(readlink -f "$dst")
        if [ "$cursrc" != "$src" ]; then
            dstbak="$dst.bak"
            echo WARNING: Destination file $dst already exists and is a link to $cursrc - moving it out of the way to $dstbak.
            mv "$dst" "$dstbak"
        fi
    fi

    if [ ! -f "$dst" ]; then
        echo Installing $src as $dst
        $LINK "$src" "$dst"
    fi
done