# Key bindings
# ------------
function fzf_key_bindings

  # Store current token in $dir as root for the 'find' command
  function fzf-file-widget -d "List files and folders"
    set -l commandline (__fzf_parse_commandline)
    set -l dir $commandline[1]
    set -l fzf_query $commandline[2]

    # "-path \$dir'*/\\.*'" matches hidden files/folders inside $dir but not
    # $dir itself, even if hidden.
    set -q FZF_CTRL_T_COMMAND; or set -l FZF_CTRL_T_COMMAND "
    command find -L \$dir -mindepth 1 \\( -path \$dir'*/\\.*' -o -fstype 'sysfs' -o -fstype 'devfs' -o -fstype 'devtmpfs' \\) -prune \
    -o -type f -print \
    -o -type d -print \
    -o -type l -print 2> /dev/null | sed 's@^\./@@'"

    set -q FZF_TMUX_HEIGHT; or set FZF_TMUX_HEIGHT 40%
    begin
      set -lx FZF_DEFAULT_OPTS "--height $FZF_TMUX_HEIGHT --reverse $FZF_DEFAULT_OPTS $FZF_CTRL_T_OPTS"
      eval "$FZF_CTRL_T_COMMAND | "(__fzfcmd)' -m --query "'$fzf_query'"' | while read -l r; set result $result $r; end
    end
    if [ -z "$result" ]
      commandline -f repaint
      return
    else
      # Remove last token from commandline.
      commandline -t ""
    end
    for i in $result
      commandline -it -- (string escape $i)
      commandline -it -- ' '
    end
    commandline -f repaint
  end

  function fzf-history-widget -d "Show command history"
    set -q FZF_TMUX_HEIGHT; or set FZF_TMUX_HEIGHT 40%
    begin
      set -lx FZF_DEFAULT_OPTS "--height $FZF_TMUX_HEIGHT $FZF_DEFAULT_OPTS --tiebreak=index --bind=ctrl-r:toggle-sort $FZF_CTRL_R_OPTS +m"
      history -z | eval (__fzfcmd) --read0 -q '(commandline)' | perl -pe 'chomp if eof' | read -lz result
      and commandline -- $result
    end
    commandline -f repaint
  end

  function fzf-cd-widget -d "Change directory"
    set -l commandline (__fzf_parse_commandline)
    set -l dir $commandline[1]
    set -l fzf_query $commandline[2]

    set -q FZF_ALT_C_COMMAND; or set -l FZF_ALT_C_COMMAND "
    command find -L \$dir -mindepth 1 \\( -path \$dir'*/\\.*' -o -fstype 'sysfs' -o -fstype 'devfs' -o -fstype 'devtmpfs' \\) -prune \
    -o -type d -print 2> /dev/null | sed 's@^\./@@'"
    set -q FZF_TMUX_HEIGHT; or set FZF_TMUX_HEIGHT 40%
    begin
      set -lx FZF_DEFAULT_OPTS "--height $FZF_TMUX_HEIGHT --reverse $FZF_DEFAULT_OPTS $FZF_ALT_C_OPTS"
      eval "$FZF_ALT_C_COMMAND | "(__fzfcmd)' +m --query "'$fzf_query'"' | read -l result

      if [ -n "$result" ]
        cd $result

        # Remove last token from commandline.
        commandline -t ""
      end
    end

    commandline -f repaint
  end

  function __fzfcmd
    set -q FZF_TMUX; or set FZF_TMUX 0
    set -q FZF_TMUX_HEIGHT; or set FZF_TMUX_HEIGHT 40%
    if [ $FZF_TMUX -eq 1 ]
      echo "fzf-tmux -d$FZF_TMUX_HEIGHT"
    else
      echo "fzf"
    end
  end

  bind \ct fzf-file-widget
  bind \cr fzf-history-widget
  bind \ec fzf-cd-widget

  if bind -M insert > /dev/null 2>&1
    bind -M insert \ct fzf-file-widget
    bind -M insert \cr fzf-history-widget
    bind -M insert \ec fzf-cd-widget
  end

  function __fzf_parse_commandline -d 'Parse the current command line token and return split of existing filepath and rest of token'
    # eval is used to do shell expansion on paths
    set -l commandline (eval "printf '%s' "(commandline -t))

    if [ -z $commandline ]
      # Default to current directory with no --query
      set dir '.'
      set fzf_query ''
    else
      set dir (__fzf_get_dir $commandline)

      if [ "$dir" = "." -a (string sub -l 1 $commandline) != '.' ]
        # if $dir is "." but commandline is not a relative path, this means no file path found
        set fzf_query $commandline
      else
        # Also remove trailing slash after dir, to "split" input properly
        set fzf_query (string replace -r "^$dir/?" '' "$commandline")
      end
    end

    echo $dir
    echo $fzf_query
  end

  function __fzf_get_dir -d 'Find the longest existing filepath from input string'
    set dir $argv

    # Strip all trailing slashes. Ignore if $dir is root dir (/)
    if [ (string length $dir) -gt 1 ]
      set dir (string replace -r '/*$' '' $dir)
    end

    # Iteratively check if dir exists and strip tail end of path
    while [ ! -d "$dir" ]
      # If path is absolute, this can keep going until ends up at /
      # If path is relative, this can keep going until entire input is consumed, dirname returns "."
      set dir (dirname "$dir")
    end

    echo $dir
  end

end