http://prayogshala.wordpress.com/2014/02/11/tat4nix-extract-code-blocks-with-ease/

fn__extrt_block

#!/bin/ksh

##DESC======================================================================
### Extracts block of code/section based on two arguments;
### 1 - Source Code File, or Git Diff Output
### 2 - Extract Pattern
##======================================================================
function fn__extrt_block {

  test $# -ne 2 && exit 1
  test -f $1 && fv_iputFile=$1 || exit 2
  fv_srchPtrn="$2"

  fv_funcWorkDir=$HOME/${0}

  mkdir -p ${fv_funcWorkDir} && cd ${fv_funcWorkDir}

  grep -n "${fv_srchPtrn}" ${fv_iputFile} | cut -d':' -f1 > outfile

  while true
  do
    echo $(head -2 outfile) | read LB UB
    test ! -z ${UB} && UB=`echo ${UB} - 1 | bc`

    echo "${LB},${UB:-\$}p" > sed_scpt

    sed -n -f sed_scpt ${fv_iputFile} > file__${LB}_${UB:-$}

    sed '1d' outfile > outfile.n

    mv outfile.n outfile

    test ! -s outfile && break
  done

  rm -f outfile* sed_scpt

  echo "INFO: Listing Generated Files"

  ls -ltr file__*
}