Wrapper around ripgrep which adds a --files-from option similar to ack

rgf.sh

#!/usr/bin/env bash
#
# Provides a --files-from option: rgf --files-from=[-|FILELIST]
# The list of files to be searched is specified in FILELIST and must be separated by newlines.
# If FILELIST is "-", the list is loaded from standard input.
# This option may be specified multiple times.
#
# Note that this affects how the -t option is applied. When --files-from is specified,
# -t is used to filter the list of files and then ripgrep searches for PATTERN on the list of filtered files
#
# * rgf --files-from=FILELIST PATTERN
#   - Search for PATTERN in all files specified in FILELIST
#
# * cat FILELIST | rgf --files-from=- PATTERN
#   rgf --files-from=- PATTERN < FILELIST
#   - Search for PATTERN in all files specified in FILELIST
#
# * rgf --files-from=- -tFILETYPE PATTERN < FILELIST
#   - Filter FILELIST for all files of type FILETYPE and then search for PATTERN on the filtered output

re=\(-h\|--help\)\\b
if [[ "$*" =~ $re ]]; then
  command rg "$@"
  echo "
Options added by rgf:
        --files-from=FILE                   The list of files to be searched is specified in FILE (similar to ack)
                                            The list of files must be separated by newlines.
                                            If FILE is "-", the list is loaded from standard input.
                                            When used together with --type=TYPE, files specified in FILE
                                            are filtered by TYPE and ripgrep is then run on the filtered output"
  exit 0
elif [[ ! "$*" =~ '--files-from' ]]; then
  command rg "$@"
  exit $!
fi

local _ft_filt=()
local _flist=()
local _rg_opts=()

while (( $# > 0 )); do
  if [[ "$1" =~ '--files-from=' ]]; then
    local _f=$(sed 's/--files-from=//' <<< "$1")
    _flist+=("$_f")
  elif [[ "$1" =~ '--files-from' ]]; then
    shift
    _flist+=("$1")
  elif [[ "$1" =~ [^-]-t[[:alpha:]]+ ]]; then
    _ft_filt+=($(sed -s 's/^-t//' <<< "$1"))
  elif [[ "$1" == "--type" ]]; then
    shift
    _ft_filt+=("$1")
  else
    _rg_opts+=("$1")
  fi

  shift
done
# echo "FList: ${_flist[@]}"
# echo "Types: ${_ft_filt[@]}"
# echo "rg Opts: ${_rg_opts[@]}"

# Compile list of filetypes to filter filelist by
local _ft_pat=""
for _ft in "${_ft_filt[@]}"; do
  _ft_pat="${_ft_pat}|$(command rg --type-list | command rg "^$_ft" | cut -d: -f2 | tr -d '*.{ }' | tr ',' '|')"
done

# Remove the leading |
_ft_pat=${_ft_pat#|}
# echo "FileType Pattern: $_ft_pat"

# Finally search for PATTERN on all the files
for _f in ${_flist[@]}; do
  cat "$_f"
done | command xargs -d '\n' rg "${_rg_opts[@]}"