.make-release-support

#!/usr/bin/env bash

# Copyright 2015  Xebia Nederland B.V.
# Copyright (c) 2014-2015 François Saint-Jacques <fsaintjacques@gmail.com>
# for semver regex (https://github.com/fsaintjacques/semver-tool)

SCRIPT_SRC="$(dirname "${BASH_SOURCE[${#BASH_SOURCE[@]} - 1]}")"
SCRIPT_DIR="$(cd "${SCRIPT_SRC}" >/dev/null 2>&1 && pwd)"

# Some constants for SEMVER regexp
NAT='0|[1-9][0-9]*'
ALPHANUM='[0-9]*[A-Za-z-][0-9A-Za-z-]*'
IDENT="$NAT|$ALPHANUM"
FIELD='[0-9A-Za-z-]+'

SEMVER_REGEX="\
^[vV]?\
($NAT)\\.($NAT)\\.($NAT)\
(\\-(${IDENT})(\\.(${IDENT}))*)?\
(\\+${FIELD}(\\.${FIELD})*)?$"

PRERELEASE_REGEX="^\\-rc(${NAT})$"

# Uses git status in short format to see if there are outstanding files that
# have not been commited
function hasChanges() {
	test -n "$(git status -s .)"
}

# This returns the version contained in Cargo.toml
function getRelease() {
  local rel=$(cat Cargo.toml | grep '^version' | cut -d '=' -f 2 | tr -d \")
  rel="${rel#"${rel%%[![:space:]]*}"}"   # remove leading whitespace characters
  echo "$rel"
}

function getTag() {
  # FIXME Understand what arguments are provided
	if [ -z "$1" ] ; then
    echo "v$(getRelease)"
	else
		echo "v$1"
	fi
}

function getLastTag() {
  # We get the last tag that is not a prerelease (ie does not contain rc)
  git tag -l --sort=version:refname v* | grep -v rc | tail -n 1
}

# This function returns the type of release (ie patch, minor, major).
# To do this, we first get the tag of the last rc0.
# We use this tag to display the commit message,
# which is expected to be something like
# [Versioned] new XXX prerelease.
# So by splitting at spaces, we just extract the third field.
# (it brittle)
function getReleaseMessage() {
  local rc0=$(git tag -l --sort=version:refname | grep rc0 | tail -n 1)
  local release_type=$(git log --format=%B -n 1 ${rc0} | cut -d ' ' -f 3)
  echo "new ${release_type} release"
}


# This function returns the tag(s) for use with Docker.
# If the version (from getRelease) is a prerelease (finishes with rcN),
# then we only return this value.
# If the versios is a release (X.Y.Z), then we return an array of strings,
# X X.Y X.Y.Z
function getDockerTags() {
	local ORIGINAL=$(getRelease)
  if [[ "$ORIGINAL" =~ $SEMVER_REGEX ]]; then
    local MAJOR=${BASH_REMATCH[1]}
    local MINOR=${BASH_REMATCH[2]}
    local PATCH=${BASH_REMATCH[3]}
    local PRERE=${BASH_REMATCH[4]}
    if [ -n "$PRERE" ]; then
      echo "$ORIGINAL"
    else
      echo "${MAJOR} ${MAJOR}.${MINOR} ${MAJOR}.${MINOR}.${PATCH}"
    fi
  else
    echo "$ORIGINAL"
  fi
}

# Updates the version in Cargo.toml
# $1 Version (must match semver)
# This function works in 3 steps:
# 1. validate the argument
# 2. validate the version
# 3. set the version. This part, which is very specific to the project this script is embedded in,
#    has been extracted in the function `setReleaseProject`.
function setRelease() {
  local VERSION="$1"
  echo "Setting the new release to ${VERSION}"
	# Check that VERSION is set and non-empty
  [[ -z "${VERSION+xxx}" ]] &&
    { echo "The variable \$VERSION is not set. Make sure it is set before using setRelease."; return 1; }
  [[ -z "${VERSION}" && "${VERSION+xxx}" = "xxx" ]] &&
    { echo "The variable \$VERSION is set but empty. Make sure it is not empty before using setRelease."; return 1; }

  validate_version ${VERSION}
  [[ $? != 0 ]] &&
    { echo "${VERSION} is not valid semantic version"; return 1; } ||
    { setReleaseProject "${VERSION}"; }

  return 0
}

# This function assumes the version given as argument has been validated.
# It needs to be customized for each project. It writes the version ($1) to file(s).
function setReleaseProject() {
  local VERSION="$1"
  sed -i -e "s/^version\s*=\s*\".*\"/version = \"$VERSION\"/" Cargo.toml
  sed -i -e "s/^version\s*=\s*\".*\"/version = \"$VERSION\"/" libs/bragi/Cargo.toml
  sed -i -e "s/^version\s*=\s*\".*\"/version = \"$VERSION\"/" libs/mimir/Cargo.toml
  sed -i -e "s/^version\s*=\s*\".*\"/version = \"$VERSION\"/" libs/tools/Cargo.toml
  sed -i -e "s/^version\s*=\s*\".*\"/version = \"$VERSION\"/" libs/docker_wrapper/Cargo.toml
}

# Not used
function runPreTagCommand() {
	if [ -n "$1" ] ; then
		COMMAND=$(sed -n -e "s/@@RELEASE@@/$1/g" -e 's/^pre_tag_command=\(.*\)/\1/p' .release)
		if [ -n "$COMMAND" ] ; then
			if ! OUTPUT=$(bash -c "$COMMAND" 2>&1) ; then echo $OUTPUT >&2 && exit 1 ; fi
		fi
	else
		echo "ERROR: missing release version parameter " >&2
		return 1
	fi
}

# This function retrieves the candidate tag from Cargo.toml (with getTag),
# and make sure it is available with git tag.
function tagExists() {
	tag=${1:-$(getTag)}
	test -n "$tag" && test -n "$(git tag | grep "^$tag\$")"
}

function differsFromRelease() {
	tag=$(getTag)
	! tagExists $tag || test -n "$(git diff --shortstat -r $tag .)"
}

# This function retrieves the release, and if the git tag differs from
# the version in Cargo.toml, add the commit, and also add 'dirty' if the
# version has outstanding changes.
function getVersion() {
	local result=$(getRelease)

	if differsFromRelease; then
		result="${result}-$(git log -n 1 --format=%h .)"
	fi

	if hasChanges ; then
		result="${result}-dirty"
	fi
  echo "${result}"
}

# $1 version
# $2 variable to set
# Returns 0 and set $2 if $1 follows semver, returns 1 otherwise
function validate_version() {
  local version=$1
  [[ "$version" =~ $SEMVER_REGEX ]] && { return 0; } || { return 1; }
}

# $1 version
# $2 variable to set
# Returns 0 and set $2 if $1 follows semver, returns 1 otherwise
function decompose_version() {
  if [ "$#" -ne "2" ]; then
    echo "You must supply 2 arguments"
    return 1
  fi
  local version=$1
  if [[ "$version" =~ $SEMVER_REGEX ]]; then
    local major=${BASH_REMATCH[1]}
    local minor=${BASH_REMATCH[2]}
    local patch=${BASH_REMATCH[3]}
    local prere=${BASH_REMATCH[4]}
    local build=${BASH_REMATCH[8]}
    eval "$2=(\"$major\" \"$minor\" \"$patch\" \"$prere\" \"$build\")"
    return 0
  else
    return 1
  fi
}

function validate_prerelease() {
  if [ "$#" -ne "2" ]; then
    echo "You must supply 2 arguments"
    return 1
  fi
  local prerelease=$1
  if [[ "$prerelease" =~ $PRERELEASE_REGEX ]]; then
    local iter=${BASH_REMATCH[1]}
    eval "$2=$iter"
    return 0
  else
    echo "prerelease $prerelease does not match the expected scheme '-rcN'. See help for more information."
    return 1
  fi
}

function nextMajorPrerelease() {
	local ORIGINAL=$(getRelease)
  decompose_version "$ORIGINAL" SEMVER
  if [ $? -eq 0 ]; then
    local MAJOR="${SEMVER[0]}"
    MAJOR=$(($MAJOR + 1))
    local VERSION="${MAJOR}.0.0-rc0"
    echo "${VERSION}"
  else
    echo "${ORIGINAL}"
  fi
}

function nextMinorPrerelease() {
	local ORIGINAL=$(getRelease)
  decompose_version "$ORIGINAL" SEMVER
  if [ $? -eq 0 ]; then
    local MAJOR="${SEMVER[0]}"
    local MINOR="${SEMVER[1]}"
    MINOR=$(($MINOR + 1))
    local VERSION="${MAJOR}.${MINOR}.0-rc0"
    echo "${VERSION}"
  else
    echo "${ORIGINAL}"
  fi
}

function nextPatchPrerelease() {
	local ORIGINAL=$(getRelease)
  decompose_version "$ORIGINAL" SEMVER
  if [ $? -eq 0 ]; then
    local MAJOR="${SEMVER[0]}"
    local MINOR="${SEMVER[1]}"
    local PATCH="${SEMVER[2]}"
    PATCH=$(($PATCH + 1))
    local VERSION="${MAJOR}.${MINOR}.${PATCH}-rc0"
    echo "${VERSION}"
  else
    echo "${ORIGINAL}"
  fi
}

function nextPrerelease() {
	local ORIGINAL=$(getRelease)
  decompose_version "$ORIGINAL" SEMVER
  if [ $? -eq 0 ]; then
    local MAJOR="${SEMVER[0]}"
    local MINOR="${SEMVER[1]}"
    local PATCH="${SEMVER[2]}"
    local PRERE="${SEMVER[3]}"
    validate_prerelease "$PRERE" i
    local VERSION="$MAJOR.$MINOR.$PATCH-rc$((i + 1))"
    echo "${VERSION}"
  else
    echo "${ORIGINAL}"
  fi
}

function nextRelease() {
	local ORIGINAL=$(getRelease)
  decompose_version "$ORIGINAL" SEMVER
  if [ $? -eq 0 ]; then
    local MAJOR="${SEMVER[0]}"
    local MINOR="${SEMVER[1]}"
    local PATCH="${SEMVER[2]}"
    local VERSION="$MAJOR.$MINOR.$PATCH"
    echo "${VERSION}"
  else
    echo "${ORIGINAL}"
  fi
}


# $1 tag.
# We will returning the changelog from last tag till HEAD
# We extract the commit msg, followed by a delimiter, followed by the hash
function changeLog() {
  git log $1..HEAD --pretty='format:%s -- %h' | sort
}

# We receive the log as a multiline string, one commit per line, containing the message, followed by the hash
# We create a dictionary, which contains, for each type of commit, an array of hash
# But since we can't work with arrays inside a dictionary, it's just a string with -- delimiters between hashes.
function splitLog() {
  declare -A assoc
  str="$1"
  # FIXME SAVE IFS
  IFS=$'\n'
  for line in $(echo "${str}"); do
    # echo "orig: $line"
    re="\[([[:alpha:]]+)\] .* -- (.*)"
    if [[ $line =~ $re ]]; then
      local commit_type="${BASH_REMATCH[1]}"
      local commit_hash="${BASH_REMATCH[2]}"
      local res="${assoc["${commit_type}"]}"
      if [[ -z "$res" && "${res+xxx}" = "xxx" ]]; then
        assoc["$commit_type"]="$commit_hash"
      else
        assoc["$commit_type"]="$res--$commit_hash"
      fi
    fi
  done
  # For debug
  # for i in ${!assoc[@]}; do
  #   echo "$i ${assoc[$i]}"
  # done
  # Now we generate the output. So we iterate through all the commit types,
  # and for each commit type, we iterate through the list of hashes.
  # For each hash, we use git show to display the information
  for commit_type in ${!assoc[@]}; do
    # We don't want to list all the Version related commits... so skip them.
    if [ "$commit_type" != "Versioned" ]; then
      local commits="${assoc["$commit_type"]}"
      delimiter="--"
      conCatString=$commits$delimiter
      splitMultiChar=()
      while [[ $conCatString ]]; do
        splitMultiChar+=( "${conCatString%%"$delimiter"*}" )
        conCatString=${conCatString#*"$delimiter"}
      done
      echo "### ${commit_type}:" >> /tmp/changelog.md
      for commit in "${splitMultiChar[@]}"; do
        local change=$(git show -s --pretty='format:%s, %an, %as, %h' ${commit})
        # We remove the [xxx] because its redundant with the section
        # this syntax means keep everything after first space
        change="${change#* }"
        echo "- ${change}" >> /tmp/changelog.md
      done
      echo "\n" >> /tmp/changelog.md
    fi
  done
}

# $1 current tag
# $2 old tag
function generateChangelog() {
  # FIXME Use temp file instead
  rm -f /tmp/changelog.md
  local day="$(date +%Y-%m-%dT%H:%M:%SZ)"
  echo "## $1\n" >> /tmp/changelog.md
  echo "Released $day\n">> /tmp/changelog.md
  echo "" >> /tmp/changelog.md

  local log=$(changeLog $2)
  echo "$log"
  splitLog "$log"
  # Now to generate the log, we remove the header, prepend
  # the new changelog on the old one, and put the header back.
  # In the following line, the +11 matches the height of the header.
  tail -n +11 CHANGELOG.md > /tmp/old-changelog.md
  cat /tmp/changelog.md /tmp/old-changelog.md > CHANGELOG.md
  addChangelogHeader
}

function addChangelogHeader() {
  read -r -d '' header <<'EOF'
# Changelog

All notable changes to this project will be documented in this file.

The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).

This file is generated automatically by the release procedure, please do not edit.

EOF

  echo -e "${header}\n\n\n$(cat CHANGELOG.md)" > CHANGELOG.md
}