#!/usr/bin/env bash

. "$(git rev-parse --show-toplevel)/gitTools/functions"

case "$1" in
  --smudge)
    action=smudge
    shift
    ;;

  *)
    action=clean
    shift
    ;;
esac

CommentStart=`getAttribute CommentStart "$1"`

if [ _"$CommentStart" == _unspecified -o \
     _"$CommentStart" == _unset -o \
     _"$CommentStart" == _set -o \
     _"$CommentStart" == _ ]; then
  CommentStart=
fi

CommentEnd=`getAttribute CommentEnd "$1"`

if [ _"$CommentEnd" == _unspecified -o \
     _"$CommentEnd" == _unset -o \
     _"$CommentEnd" == _set -o \
     _"$CommentEnd" == _ ]; then
  CommentEnd=
fi

PrologEnd=`getAttribute PrologEnd "$1"`

if [ _"$PrologEnd" == _unspecified -o \
     _"$PrologEnd" == _unset -o \
     _"$PrologEnd" == _set -o \
     _"$PrologEnd" == _ ]; then
  PrologEnd=0
fi

Commit="`git log -1 ${branch} --pretty=%H -- "$1"`"
Author="`git log -1 ${branch} --pretty="%an %ae" -- "$1"`"
Date="`git log -1 ${branch} --pretty=%ai -- "$1"`"

GAWK=`gitTool gawk`
[ x"$GAWK" == x ] && CommentStart=

function smudge() {
$GAWK -- '
BEGIN {
  Header = 0
  Skip = 0
  Prolog = "'"$PrologEnd"'"
}

$0 ~ "('"$CommentStart"'|/\\*) Begin git Header" {
  skip = 2 
}

{
  if (Prolog == 0 && Header < 1) {
    printf "'"$CommentStart"' Begin git Header '"$CommentEnd"'\n"
    printf "'"$CommentStart"'   Commit: '"$Commit"' '"$CommentEnd"'\n"
    printf "'"$CommentStart"'   Author: '"$Author"' '"$CommentEnd"'\n"
    printf "'"$CommentStart"'   Date: '"$Date"' '"$CommentEnd"'\n"
    printf "'"$CommentStart"' End git Header '"$CommentEnd"'\n"
    printf "\n"

    Header = 1
  }

  if (skip == 0) {
    print $0
  } else if (skip == 1) {
    if ($0 !~ "^$") {
      print $0
    }

    skip = 0
  }
}

$0 ~ "End git Header" {
  if (skip == 2) {
    skip = 1
  }
}

$0 ~ Prolog {
  Prolog = 0
}'
}

function clean () {
  $GAWK -- '
BEGIN {
  Skip = 0
}

$0 ~ "('"$CommentStart"'|/\\*) Begin git Header" {
  skip = 2 
}

{
  if (skip == 0) {
    print $0
  } else if (skip == 1) {
    if ($0 !~ "^$") {
      print $0
    }

    skip = 0
  }
}

$0 ~ "End git Header" {
  if (skip == 2) {
    skip = 1
  }
}'
}

if [ x"$CommentStart" != x ]; then
  cat | $action
else
  cat
fi