#!/bin/zsh
  
  # Each line in this string has the following entries separated by a space
  # character.
  # <bundle-name>, <repo-url>, <plugin-location>, <repo-local-clone-dir>
  # FIXME: Is not kept local by zsh!
  local bundles=""
  
  # Syntaxes
  #   bundle <url> [<loc>=/] [<name>]
  bundle () {
  
      # Bundle spec arguments' default values.
      local url="$ANTIGEN_DEFAULT_REPO_URL"
      local loc=/
      local name=
      local load=true
  
      # Set spec values based on the positional arguments.
      local position_args='url loc name'
      local i=1
      while ! [[ -z $1 || $1 == --*=* ]]; do

          local arg_name="$(echo "$position_args" | cut -d\  -f$i)"
          local arg_value="$1"

          eval "local $arg_name='$arg_value'"
          shift
          i=$(($i + 1))
      done

      # Check if url is just the plugin name. Super short syntax.
      if [[ "$url" != */* ]]; then
          loc="plugins/$url"
          url="$ANTIGEN_DEFAULT_REPO_URL"
      fi

      # Set spec values from keyword arguments, if any. The remaining arguments
      # are all assumed to be keyword arguments.
      while [[ $1 == --*=* ]]; do

          local arg_name="$(echo "$1" | cut -d= -f1 | sed 's/^--//')"
          local arg_value="$(echo "$1" | cut -d= -f2)"

          eval "local $arg_name='$arg_value'"
          shift
      done
  
      # Resolve the url.
      if [[ $url != git://* && $url != https://* ]]; then

          url="${url%.git}"

          name="$(basename "$url")"

          url="https://github.com/$url.git"

      fi
  
      # Plugin's repo will be cloned here.
      local clone_dir="$ANTIGEN_REPO_CACHE/$(echo "$url" \
          | sed -e 's/\.git$//' -e 's./.-SLASH-.g' -e 's.:.-COLON-.g')"
  
      # Make an intelligent guess about the name of the plugin, if not already
      # done or is explicitly specified.
      if [[ -z $name ]]; then
          name="$(basename $url/$loc)"
      fi
  
      # Add it to the record.
      bundles="$bundles
  $name $url $loc $clone_dir"
  
      # Load it, unless specified otherwise.
      if $load; then
          bundle-load "$name"
      fi
  }
  
  bundle-install () {

      local update=false

      if [[ $1 == --update ]]; then

          update=true

          shift

      fi
  
      mkdir -p "$ANTIGEN_BUNDLE_DIR"
  
      local handled_repos=""

      local install_bundles=""

      if [[ $# != 0 ]]; then
          # Record and install just the given plugin here and now.
          bundle "$@"

          install_bundles="$(echo "$bundles" | tail -1)"

      else
          # Install all the plugins, previously recorded.

          install_bundles="$(echo-non-empty "$bundles")"
      fi

      # If the above `if` is directly piped to the below `while`, the contents
      # inside the `if` construct are run in a new subshell, so changes to the
      # `$bundles` variable are lost after the `if` construct finishes. So, we
      # need the temporary `$install_bundles` variable.
      echo "$install_bundles" | while read spec; do

  
          local name="$(echo "$spec" | awk '{print $1}')"
          local url="$(echo "$spec" | awk '{print $2}')"
          local loc="$(echo "$spec" | awk '{print $3}')"
          local clone_dir="$(echo "$spec" | awk '{print $4}')"
  
          if [[ -z "$(echo "$handled_repos" | grep -Fm1 "$url")" ]]; then

              if [[ ! -d $clone_dir ]]; then

                  git clone "$url" "$clone_dir"

              elif $update; then
                  git --git-dir "$clone_dir/.git" pull

              fi
  
              handled_repos="$handled_repos
  $url"
          fi
  
          if [[ $name != *.theme ]]; then

              echo Installing $name

              local bundle_dest="$ANTIGEN_BUNDLE_DIR/$name"
              test -e "$bundle_dest" && rm -rf "$bundle_dest"

              ln -s "$clone_dir/$loc" "$bundle_dest"

          else
              mkdir -p "$ANTIGEN_BUNDLE_DIR/$name"
              cp "$clone_dir/$loc" "$ANTIGEN_BUNDLE_DIR/$name"
          fi
  
          bundle-load "$name"
  
      done

      # Initialize completions after installing
      bundle-apply

  }

  bundle-install! () {
      bundle-install --update
  }

  bundle-cleanup () {
  
      # Find directores in ANTIGEN_BUNDLE_DIR, that are not in the bundles record.
      local unidentified_bundles="$(comm -13 \
          <(echo-non-empty "$bundles" | awk '{print $1}' | sort) \
          <(ls -1 "$ANTIGEN_BUNDLE_DIR"))"
  
      if [[ -z $unidentified_bundles ]]; then
          echo "You don't have any unidentified bundles."
          return 0
      fi
  
      echo The following bundles are not recorded:
      echo "$unidentified_bundles" | sed 's/^/  /'
  
      echo -n '
  Delete them all? [y/N] '
      if read -q; then
          echo
          echo
          echo "$unidentified_bundles" | while read name; do
              echo -n Deleting $name...
              rm -rf "$ANTIGEN_BUNDLE_DIR/$name"
              echo ' done.'
          done
      else
          echo
          echo Nothing deleted.
      fi
  }

  bundle-load () {

      local name="$1"
      local bundle_dir="$ANTIGEN_BUNDLE_DIR/$name"

  
      # Source the plugin script

      local script_loc="$bundle_dir/$name.plugin.zsh"

      if [[ -f $script_loc ]]; then
          source "$script_loc"
      fi
  
      # If the name of the plugin ends with `.lib`, all the *.zsh files in it are
      # sourced. This is kind of a hack to source the libraries of oh-my-zsh.
      if [[ $name == *.lib ]]; then
          # FIXME: This throws an error if no files match the given glob pattern.
          for lib ($bundle_dir/*.zsh) source $lib
      fi
  
      # If the name ends with `.theme`, it is handled as if it were a zsh-theme
      # plugin.
      if [[ $name == *.theme ]]; then

          local theme_file="$bundle_dir/${name%.theme}.zsh-theme"
          test -f "$theme_file" && source "$theme_file"

      fi

      # Add to $fpath, for completion(s)
      fpath=($bundle_dir $fpath)

  }
  
  bundle-lib () {
      bundle --name=oh-my-zsh.lib --loc=lib
  }
  
  bundle-theme () {
      local url="$ANTIGEN_DEFAULT_REPO_URL"
      local name="${1:-robbyrussell}"

      bundle-install "$url" --name=$name.theme --loc=themes/$name.zsh-theme

  }

  bundle-apply () {

      # Initialize completion.

      compinit -i
  }

  # Does what it says.
  echo-non-empty () {
      echo "$@" | while read line; do
          [[ $line != "" ]] && echo $line
      done
  }
  
  -bundle-env-setup () {

      # Pre-startup initializations

      -set-default ANTIGEN_DEFAULT_REPO_URL \
          https://github.com/robbyrussell/oh-my-zsh.git
      -set-default ANTIGEN_REPO_CACHE $HOME/.antigen/cache
      -set-default ANTIGEN_BUNDLE_DIR $HOME/.antigen/bundles

  
      # Load the compinit module
      autoload -U compinit
  
      # Without the following, `compdef` function is not defined.
      compinit -i

  }
  
  # Same as `export $1=$2`, but will only happen if the name specified by `$1` is
  # not already set.
  -set-default () {

      local arg_name="$1"
      local arg_value="$2"

      eval "test -z \"\$$arg_name\" && export $arg_name='$arg_value'"
  }
  
  -bundle-env-setup