#!/bin/sh

echo "Running pre-commit hook..."

# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
echo ">>  Updating R documentation..."
if command -v Rscript > /dev/null; then
  if [ "$(Rscript -e 'cat(all(c('"'roxygen2'"', '"'pkgload'"') %in% rownames(installed.packages())))')" = "TRUE" ]; then
    Rscript -e "suppressMessages(roxygen2::roxygenise())"
    currentpkg=`Rscript -e "cat(pkgload::pkg_name())"`
    git add man/*
    echo ">>  done."
  else
    echo ">>  R packages 'roxygen2' and 'pkgload' are not installed!"
    currentpkg="your"
  fi
else
  echo ">>  R is not available on your system!"
  currentpkg="your"
fi
echo ">>  "


# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
echo ">>  Updating semantic versioning and date..."

# get tags from remote, and remove tags not on remote:
git fetch origin --prune --prune-tags --quiet
currenttagfull=`git describe --tags --abbrev=0`
currenttag=`git describe --tags --abbrev=0 | sed 's/v//'`
if [ "$currenttag" = "" ]; then
  # there is no tag, so set tag to 0.0.1 and commit index to current count
  echo ">>  - no git tags found, create some using v(x).(y).(z)"
  currenttag="0.0.1"
  currentcommit=`git rev-list --count HEAD`
else
  # there is a tag, so base version number on that
  currentcommit=`git rev-list --count ${currenttagfull}..HEAD`
  if (( "$currentcommit" == 0 )); then
    # tag is new, so this must become the version number
    currentversion="$currenttag"
  fi
  echo ">>  - latest tag is '${currenttagfull}', with ${currentcommit} previous commits"
fi
if [ "$currentversion" = "" ]; then
  # combine tag (e.g. 1.2.3) and commit number (like 5) increased by 9000 to indicate beta version
  currentversion="$currenttag.$((currentcommit + 9001))" # results in e.g. 1.2.3.9005
fi
echo ">>  - ${currentpkg} pkg version set to ${currentversion}"

# set version number and date to DESCRIPTION file
sed -i -- "s/^Version: .*/Version: ${currentversion}/" DESCRIPTION
sed -i -- "s/^Date: .*/Date: $(date '+%Y-%m-%d')/" DESCRIPTION
echo ">>  - updated DESCRIPTION"
# remove leftover on macOS
rm -f DESCRIPTION--
# add to commit
git add DESCRIPTION

# set version number to NEWS file
if [ -e "NEWS.md" ]; then
  if [ "$currentpkg" = "your" ]; then
    currentpkg=""
  fi
  sed -i -- "1s/.*/# ${currentpkg} ${currentversion}/" NEWS.md
  echo ">>  - updated NEWS.md"
  # remove leftover on macOS
  rm -f NEWS.md--
  # add to commit
  git add NEWS.md
else
  echo ">>  - no NEWS.md found!"
fi
echo ">>  "