bin/rcup


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#!/bin/sh

#set -x

REPLACE_ALL=0

DEST_DIR=$HOME
DOTFILES_DIR=$HOME/.dotfiles
HOSTNAME=`hostname -s`
HOST_FILES=$DOTFILES_DIR/host-$HOSTNAME
DEBUG=:
PRINT=echo
VERBOSE=:
PROMPT=echo
DIRSTACK=":$DOTFILES_DIR"
MKDIR=mkdir
LN=ln
RM=rm

pushdir() {
  DIRSTACK="$DIRSTACK:$PWD/$1"
  $DEBUG "cd'ing to $1 from `pwd` with stack $DIRSTACK"
  cd $1
}

popdir() {
  current=`echo $DIRSTACK | sed -e 's/.*://g'`
  prior=`echo $DIRSTACK | sed -e "s|:$current$||" | sed -e 's/.*://g'`
  DIRSTACK=`echo $DIRSTACK | sed -e 's/:[^:]*$//'`
  $DEBUG "cd'ing to $prior from `pwd` with stack $DIRSTACK"
  cd $prior
}

build_path() {
  local dest=$1
  local file=$2
  local dotted=$3

  if [ $dotted -eq 1 ]; then
    echo $dest/$file
  else
    echo $dest/.$file
  fi
}

link_dir() {
  local dir=$1
  local dest_dir=$2
  local dotfiles_dir=$3
  local dotted=$4
  local dest_path=`build_path $dest_dir $dir $dotted`

  $VERBOSE "recurring on $dest_path"
  $MKDIR -p $dest_path
  pushdir $dir
  for f in *; do
    $DEBUG "handling the file $f"
    handle_file $f $dest_path $3/$1 1
  done
  popdir
}

link_file() {
  local file=$1
  local dest_dir=$2
  local dotfiles_dir=$3
  local dotted=$4
  local dest_file=`build_path $dest_dir $file $dotted`

  $PRINT "linking $dest_file"
  if [ -h $dest_file ]; then
    rm -f $dest_file
  fi
  $LN -s $dotfiles_dir/$file $dest_file
}

replace_file() {
  local file=$1
  local dest_dir=$2
  local dotfiles_dir=$3
  local dotted=$4
  local dest_file=`build_path $dest_dir $file $dotted`
  
  $RM -rf $dest_file
  link_file $file $dest_dir $dotfiles_dir $dotted
}

is_identical() {
  diff -q -s $1 $2 > /dev/null
}

handle_file() {
  local file=$1
  local dest_dir=$2
  local dotfiles_dir=$3
  local dotted=$4

  $DEBUG handle_file $1 $2 $3 $4

  if [ ! -e $file ]; then
    $VERBOSE "skipping non-existent file $file"
  elif [ -d $file ]; then
    link_dir $file $dest_dir $dotfiles_dir $dotted
  else
    dest_file=`build_path $dest_dir $file $dotted`
    if [ -e "$dest_file" ]; then
      if is_identical $file $dest_file; then
        $VERBOSE "identical $dest_file"
      elif [ $REPLACE_ALL -eq 1 ]; then
        replace_file $file $dest_dir $dotfiles_dir $dotted
      else
        $PROMPT "overwrite ${dest_file}? [ynaq]"
        read overwrite
        case $overwrite in
          a)
            REPLACE_ALL=1
            replace_file $file $dest_dir $dotfiles_dir $dotted
            ;;
          y) replace_file $file $dest_dir $dotfiles_dir $dotted
            ;;
          q) exit 1
            ;;
          *) $VERBOSE "skipping $dest_file"
            ;;
        esac
      fi
    else
      link_file $file $dest_dir $dotfiles_dir $dotted
    fi
  fi
}

metafile() {
  [ x$2 = 'xhost-' -o x$3 = 'xtag-' -o x$1 = "xRakefile" -o x$1 = "xinstall" ]
}

handle_command_line() {
  arg_tags=""
  verbosity=0
  while getopts qvt: opt; do
    case "$opt" in
      t) arg_tags="$arg_tags $OPTARG";;
      v) verbosity=$(($verbosity + 1));;
      q) verbosity=$(($verbosity - 1));;
    esac
  done
  shift $(($OPTIND-1))

  if [ $verbosity -ge 2 ]; then
    DEBUG=echo
    VERBOSE=echo
    PRINT=echo
  elif [ $verbosity -eq 1 ]; then
    DEBUG=:
    VERBOSE=echo
    PRINT=echo
  elif [ $verbosity -eq 0 ]; then
    DEBUG=:
    VERBOSE=:
    PRINT=echo
  else
    DEBUG=:
    VERBOSE=:
    PRINT=:
  fi

  if [ "x$arg_tags" != "x" ]; then
    TAGS=$arg_tags
  fi

  FILES=$@
}

if [ -e $HOME/.rcrc ]; then
  . $HOME/.rcrc
fi

handle_command_line $*

cd $DOTFILES_DIR

for file in ${FILES:-*}; do
  host_portion=`echo $file | sed -e 's/host-.*/host-/'`
  tag_portion=`echo $file | sed -e 's/tag-.*/tag-/'`
  if ! metafile $file $host_portion $tag_portion; then
    handle_file $file $DEST_DIR $DOTFILES_DIR 0
  fi
done

cd $DOTFILES_DIR

if [ -d $HOST_FILES ]; then
  pushdir `basename $HOST_FILES`
  for file in ${FILES:-*}; do
    handle_file $file $DEST_DIR $HOST_FILES 0
  done
  popdir
fi

cd $DOTFILES_DIR

for tag in $TAGS; do
  if [ -d tag-$tag ]; then
    pushdir `basename tag-$tag`
    for file in ${FILES:-*}; do
      handle_file $file $DEST_DIR $DOTFILES_DIR/tag-$tag 0
    done
    popdir
  fi
done