#!/bin/sh

: ${RCM_LIB:=`dirname $0`/../share/rcm}
. $RCM_LIB/rcm.sh

link_or_copy() {
  $DEBUG "link_or_copy $1"
  local sigil=$1

  if [ "x$sigil" = "xX" ]; then
    echo $CP
  else
    echo $LN
  fi
}

link_file() {
  local src=$1
  local dest=$2
  local sigil=$3

  if [ -h $dest ]; then
    $RM -f $dest
  fi

  action=`link_or_copy $sigil`
  $DEBUG "$action $src $dest"
  $action $src $dest
}

replace_file() {
  local src=$1
  local dest=$2
  local sigil=$3

  $DEBUG replace_file $1 $2 $3
  
  $RM -rf $dest
  link_file $src $dest $sigil
}

is_nested() {
  echo $1 | sed "s:$DEST_DIR/::" | grep -q /
  return $?
}

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

handle_dir() {
  local dest=$1

  $DEBUG handle_dir $1

  dirname $dest | xargs $MKDIR -p
}

handle_file() {
  local src=$1
  local dest=$2
  local sigil=$3

  $DEBUG handle_file $1 $2 $3

  if [ -e "$dest" ]; then
    if is_identical $src $dest; then
      $VERBOSE "identical $dest"
    elif [ $REPLACE_ALL -eq 1 ]; then
      replace_file $src $dest $sigil
    else
      $PROMPT "overwrite ${dest}? [ynaq]"
      read overwrite
      case $overwrite in
        a) REPLACE_ALL=1
           replace_file $src $dest $sigil
           ;;
        y) replace_file $src $dest $sigil ;;
        q) exit 1 ;;
        *) $VERBOSE "skipping $dest" ;;
      esac
    fi
  else
    link_file $src $dest $sigil
  fi
}

show_help() {
  local exit_code=${1:-0}

  $PRINT "Usage: rcup [-CVqvfhikK] [-I EXCL_PAT] [-x EXCL_PAT] [-t TAG] [-d DOT_DIR]"
  $PRINT "see rcup(1) and rcm(5) for more details"

  exit $exit_code
}

handle_command_line() {
  local arg_tags=
  local verbosity=0
  local version=0
  local run_hooks=0
  local dotfiles_dirs=
  local files=
  local excludes=
  local includes=
  local always_copy=0
  REPLACE_ALL=0

  while getopts CVqvfhikKI:x:t:d: opt; do
    case "$opt" in
      C) always_copy=1 ;;
      d) dotfiles_dirs="$dotfiles_dirs $OPTARG" ;;
      f) REPLACE_ALL=1 ;;
      h) show_help ;;
      i) REPLACE_ALL=0 ;;
      I) includes="$includes $OPTARG" ;;
      k) run_hooks=1 ;;
      K) run_hooks=0 ;;
      q) verbosity=$(($verbosity - 1)) ;;
      t) arg_tags="$arg_tags $OPTARG" ;;
      v) verbosity=$(($verbosity + 1)) ;;
      V) version=1 ;;
      x) excludes="$excludes $OPTARG" ;;
    esac
  done
  shift $(($OPTIND-1))

  if [ $always_copy -eq 1 ]; then
    LN=$CP
  fi

  handle_common_flags rcup $version $verbosity

  tags=${arg_tags:-$TAGS}
  DOTFILES_DIRS=${dotfiles_dirs:-$DOTFILES_DIRS}
  RUN_HOOKS=$run_hooks
  files=$@

  for tag in $tags; do
    LS_ARGS="$LS_ARGS -t $tag"
  done
  for dotfiles_dir in $DOTFILES_DIRS; do
    LS_ARGS="$LS_ARGS -d $dotfiles_dir"
  done
  for exclude in $excludes; do
    LS_ARGS="$LS_ARGS -x $exclude"
  done
  for include in $includes; do
    LS_ARGS="$LS_ARGS -I $include"
  done
  LS_ARGS="$LS_ARGS $files"

  $DEBUG "LS_ARGS: $LS_ARGS"
}

LS_ARGS=-F

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

handle_command_line $*
: ${DOTFILES_DIRS:=$DOTFILES_DIRS $DEFAULT_DOTFILES_DIR}

run_hooks pre up

for dest_and_src in `lsrc $LS_ARGS`; do
  saved_ifs=$IFS
  IFS=:
  set $dest_and_src
  IFS=$saved_ifs
  dest=$1
  src=$2
  sigil=$3

  if is_nested $dest; then
    handle_dir $dest
  fi

  handle_file $src $dest $sigil
done

run_hooks post up