makeversion

#!/bin/bash
if [ $# -eq 0 ]; then
  echo >&2 "makeversion: creates new version tag and changelog"
  echo >&2 "Usage: $0 {[0-9]+.[0-9]+.[0-9]+(-beta)?}"
  exit 1
fi
getversion () {
  git describe --tags --match "v*" --long --dirty --abbrev=8 2>/dev/null
}

checkversion () {
  echo "$1" | grep -E "^v[0-9]+\.[0-9]+\.[0-9]+(-beta)?" >/dev/null
}

dissectversion () {
  echo "$1" | sed -r 's/^v([0-9]+)\.([0-9]+)\.([0-9]+)(-?(beta))?(-([0-9]+)-g([a-fA-F0-9]+)(-dirty)?)?$/\1:\2:\3:\5:\7:\8:\9:/'
}

get () {
  echo "$2" | awk -F: '{ print $'$1' }'
}

color () {
  fname=$(mktemp)
  cat - > $fname
  tput setaf $1
  cat $fname
  tput sgr0
  rm -f $fname
}

red () { color 1; }
green () { color 2; }
blue () { color 4; }

compareversions () {
  _old="$1"
  _new="$2"
  oldM=$(get 1 "$_old")
  oldm=$(get 2 "$_old")
  oldp=$(get 3 "$_old")
  newM=$(get 1 "$_new")
  newm=$(get 2 "$_new")
  newp=$(get 3 "$_new")
  dM=$((newM-oldM))
  dm=$((newm-oldm))
  dp=$((newp-oldp))
  echo "$dM:$dm:$dp"
}

makechangelog () {
  printf "\n# Enter here the informations about changes in your program in version %s.\n" "$newv" > release/changelog
  tag=$(git describe --tags --abbrev=0);
  git log --oneline "$tag"..HEAD | sed 's/^/# /' >> release/changelog
  vim -c 'set ft=gitcommit | set tw=80 | set cc=+1 | startinsert' release/changelog
  wc=$(sed '1d; 2d; /^#/ d' release/changelog | wc -w)
  if [ $wc -gt 0 ]; then
    {
      cat release/changelog_before
      cat release/changelog_template
      sed '1d; 2d; /^#/ d' release/changelog
      echo ""
      cat release/changelog_after
    } | uniq > CHANGELOG.md
    rm -f release/changelog_before
    rm -f release/changelog_template
    rm -f release/changelog_after
    sed -i '/^#/ d' release/changelog
  else
    printf "Refusing to make version '%s' with empty changelog.\n" "$newv" | red; exit 1;
  fi;
}

newv=v$1; shift;
if { checkversion $newv; }; then
  printf "Valid version '%s'.\n" "$newv" | green;
else
  printf "Invalid version '%s'.\n" "$newv" | red; exit 1;
fi

oldv=$(getversion);
printf "Current version '%s'.\n" "$oldv" | blue;

newd=$(dissectversion "$newv");
oldd=$(dissectversion "$oldv");

delta=$(compareversions "$oldd" "$newd");

x=$(get 7 "$oldd");
if [ -n "$x" ]; then
  printf "Refusing to make version '%s' on a dirty repository.\n" "$newv" | red; exit 1;
fi;

mkdir -p release/

x=$(get 1 "$delta");
if [ $x -lt 0 ]; then
  printf "Refusing to make version '%s' with older Major than '%s'.\n" "$newv" "$oldv" | red; exit 1;
elif [ $x -gt 0 ]; then
  printf "New Major.\n" | green;
  y=$(get 1 "$oldd");
  sed '/# '"$y"'$/,// d' CHANGELOG.md > release/changelog_before
  sed -n '/# '"$y"'$/,// p' CHANGELOG.md > release/changelog_after
  M=$(get 1 "$newd");
  m=$M.$(get 2 "$newd");
  p=${newv:1};
  echo -e "# $M\n\n## $m\n\n### $p\n" > release/changelog_template
else
  printf "Same Major.\n" | blue;
  x=$(get 2 "$delta");
  if [ $x -lt 0 ]; then
    printf "Refusing to make version '%s' with older minor than '%s'.\n" "$newv" "$oldv" | red; exit 1;
  elif [ $x -gt 0 ]; then
    printf "New minor.\n" | green;
    y=$(get 1 "$oldd")'\.'$(get 2 "$oldd");
    sed '/## '"$y"'$/,// d' CHANGELOG.md > release/changelog_before;
    sed -n '/## '"$y"'$/,// p' CHANGELOG.md > release/changelog_after;
    m=$(get 1 "$newd").$(get 2 "$newd");
    p=${newv:1};
    echo -e "## $m\n\n### $p\n" > release/changelog_template
  else
    printf "Same minor.\n" | blue;
    x=$(get 3 "$delta");
    if [ $x -lt 0 ]; then
      printf "Refusing to make version '%s' with older patch than '%s'.\n" "$newv" "$oldv" | red; exit 1;
    elif [ $x -gt 0 ]; then
      printf "New patch.\n" | green;
      y=$(get 1 "$oldd")'\.'$(get 2 "$oldd")'\.'$(get 3 "$oldd");
      sed '/### '"$y"'[^0-9]*$/,// d' CHANGELOG.md > release/changelog_before;
      sed -n '/### '"$y"'[^0-9]*$/,// p' CHANGELOG.md > release/changelog_after;
      p=${newv:1};
      echo -e "### $p\n" > release/changelog_template
    else
      printf "Refusing to make already existing version '%s'.\n" "$newv" | red; exit 1;
    fi;
  fi;
fi;
makechangelog;

find . -type f -name '*.sty' | xargs -n1 -d'\n' sed -i '/\\ProvidesPackage/ s/\[[^,]*,/\['"$(date +%Y\\/%m\\/%d)"' '"$newv"',/'
find . -type f -name '*.sty' | xargs -n1 -d'\n' git add

git add CHANGELOG.md && {
  nparents=$(git cat-file -p HEAD | sed -n '/^parent/ p' | wc -l)
  if [ $nparents -gt 1 ]; then
    flags=--amend;
  else
    flags=;
  fi;
} &&
git commit $flags -S -m "releasing $newv" &&
git tag "$newv" -s -F release/changelog