bash-function-tree

#!/usr/bin/env bash

# This script will read a bash script and produce
# a list of functions and their dependencies
# in a tree-like list.
#
# Argument: name of the bash script you want to analyze.
#
# Limitations:
# * if you have non-static function names like
#   myfunction${number}
#   this script will not understand it.
# * It's not built for speed. Run time will increase
#   quadratically over the number of functions.
#   (40 functions may take ~10 seconds)

script="$1"

if [ ! -f "$script" ] ; then
  echo 1>&2 "Please provide the filename of a bash script."
  exit 1
fi

function_list=$(grep '()\s{' "$script" \
                | sed -e 's/().*{.*//' \
                | sed -e 's/\s*function\s*//' \
                | egrep -v '\s*#' \
                | grep -v '=' )

echo -n "Number of functions:"
# The grep is to filter out empty lines
echo "$function_list" | grep . | wc -l
echo

for caller in $function_list ; do
  echo "$caller"
  for called in $function_list ; do
    if [[ $caller == $called ]] ; then
      continue
    fi
    awk "/^$caller\\(\\)/ {flag=1} flag; /^\}$/ {flag=0}" "$script" \
    | grep -o "$called" \
    | sort | uniq \
    | sed -e 's/^/ └─ /'
  done
done