Generate ctag list of bash functions in files

btags.sh

#!/bin/bash -

PROGRAM="${0##*/}"

if [ $# -eq 0 ]; then
  echo "Usage: $PROGRAM file1.sh file2.sh ..."
  exit 1
fi

while [ $# -gt 0 ]
do
  in_file="$1"

  if [ ! -e "$in_file" ]; then
    echo "$in_file does not exist"
    shift
    continue
  elif [ -d "$in_file" ]; then
    echo "$in_file is a directory"
    shift
    continue
  fi

  egrep -on '[A-Za-z0-9_]+[(]+[)]' "$in_file" >/dev/null
  if [ $? -eq 1 ]; then
    echo "$in_file doesn't have functions"
    shift
    continue
  fi

  out_file="${in_file%%.*}-index.txt"

  lineno=()
  fname=()

  for i in $(egrep -on '[A-Za-z0-9_]+[(]+[)]' "$in_file"  | awk -F ":" '{print $1}')
  do
    lineno+=( "$i" )
  done

  for i in $(egrep -on '[A-Za-z0-9_]+[(]+[)]' "$in_file"  | awk -F ":" '{print $2}')
  do
    fname+=( "$i" )
  done

  for ((i=0; i<${#fname[@]}; i++))
  do
    printf "{%s}\t{%s}\t{%s}\n" "$(echo ${fname[i]} | tr -d '()')" "${in_file}" "${lineno[i]}" >> "$out_file"
    #echo "{$(echo ${fname[i]} | tr -d '()')} {${in_file}} {${lineno[i]}}" >> "$out_file"
  done

  shift
done