#!/usr/bin/env bash

function usage {

echo "Usage: $(basename "$0") [-c] -f FILE_TO_CHANGE REPLACEMENT_FORMAT [-f FILE_TO_CHANGE REPLACEMENT_FORMAT ...]" 2>&1

echo 'Synchronize files to latest version in source file'

echo ' -s Specifies source file for version (default is CHANGELOG.md)'

echo ' -f Specifies a file to change and the format for searching and replacing versions'

echo ' FILE_TO_CHANGE is the file to be updated/checked for updates'

echo ' REPLACEMENT_FORMAT is one of (semver, release, api-release)'

echo ' semver indicates to look for a full semver version and replace with the latest full version'

echo ' release indicates to look for a release semver version (x.x.x) and replace with the latest release version'

echo ' api-release indicates to look for a release semver version in the context of an api route and replace with the latest release version'

echo ' -c Compare versions and output proposed changes without changing anything.'

}

function getopts-extra () {

declare -i i=1

# if the next argument is not an option, then append it to array OPTARG

while [[ ${OPTIND} -le $# && ${!OPTIND:0:1} != '-' ]]; do

OPTARG[i]=${!OPTIND}

((i += 1))

((OPTIND += 1))

done

}

# Parse input options

declare CHECK=0

declare SOURCE_FILE="CHANGELOG.md"

declare -a FILES_TO_CHECK=()

declare -a REPLACEMENT_FORMATS=()

declare args

declare OPTIND OPTARG opt

while getopts ":hcs:f:" opt; do

case $opt in

h)

usage

exit 0

;;

c)

CHECK=1

;;

s)

SOURCE_FILE="$OPTARG"

;;

f)

getopts-extra "$@"

args=( "${OPTARG[@]}" )

# validate length of args, should be 2

if [ ${#args[@]} -eq 2 ]; then

FILES_TO_CHECK+=( "${args[0]}" )

REPLACEMENT_FORMATS+=( "${args[1]}" )

else

echo "Exactly 2 arguments must follow -f option." >&2

exit 1

fi

;;

\?)

echo "Invalid option: -$OPTARG." >&2

usage

exit 1

;;

esac

done

# Parse REPLACEMENT_FORMATS

RE_SEMVER_FULL="(0|[1-9][0-9]*)\.(0|[1-9][0-9]*)\.(0|[1-9][0-9]*)(-((0|[1-9][0-9]*|[0-9]*[a-zA-Z-][0-9a-zA-Z-]*)(\.(0|[1-9][0-9]*|[0-9]*[a-zA-Z-][0-9a-zA-Z-]*))*))?(\+([0-9a-zA-Z-]+(\.[0-9a-zA-Z-]+)*))?"

RE_RELEASE="(0|[1-9][0-9]*)\.(0|[1-9][0-9]*)\.(0|[1-9][0-9]*)"

RE_API_RELEASE="v(0|[1-9][0-9]*)\.(0|[1-9][0-9]*)\.(0|[1-9][0-9]*)"

# Pull out semver appearing earliest in SOURCE_FILE.

LAST_VERSION=$(grep -o -m 1 -E "${RE_SEMVER_FULL}" "$SOURCE_FILE")

LAST_RELEASE=$(grep -o -m 1 -E "${RE_RELEASE}($|[^-+])" "$SOURCE_FILE" | grep -o -m 1 -E "${RE_RELEASE}")

LAST_API_RELEASE="v$(grep -o -m 1 -E "${RE_RELEASE}($|[^-+])$" "$SOURCE_FILE" | grep -o -m 1 -E "${RE_RELEASE}")"

declare -a RE_SEMVERS=()

declare -a UPDATED_VERSIONS=()

for i in "${!REPLACEMENT_FORMATS[@]}"; do

REPLACEMENT_FORMAT=${REPLACEMENT_FORMATS[$i]}

case $REPLACEMENT_FORMAT in

semver)

RE_SEMVERS+=( "$RE_SEMVER_FULL" )

UPDATED_VERSIONS+=( "$LAST_VERSION" )

;;

release)

RE_SEMVERS+=( "$RE_RELEASE" )

UPDATED_VERSIONS+=( "$LAST_RELEASE" )

;;

api-release)

RE_SEMVERS+=( "$RE_API_RELEASE" )

UPDATED_VERSIONS+=( "$LAST_API_RELEASE" )

;;

*)

echo "Invalid replacement format: \"${REPLACEMENT_FORMAT}\". Use semver, release, or api-release" >&2

exit 1

;;

esac

done

if [ -z "$LAST_VERSION" ];

then

# No match to semver regex in SOURCE_FILE, so no version to go from.

printf "Error: Unable to find latest version from %s.\n" "$SOURCE_FILE"

exit 1

fi

# Search files in FILES_TO_CHECK and change (or get diffs)

declare FAILED_CHECK=0

for i in "${!FILES_TO_CHECK[@]}"; do

FILE_TO_CHANGE=${FILES_TO_CHECK[$i]}

RE_SEMVER=${RE_SEMVERS[$i]}

UPDATED_VERSION=${UPDATED_VERSIONS[$i]}

FILE_VERSION=$(grep -o -m 1 -E "${RE_SEMVER}" "$FILE_TO_CHANGE")

if [ -z "$FILE_VERSION" ];

then

# No match to semver regex in VERSIONFILE, so nothing to replace

printf "Error: No semver version found in file %s.\n" "$FILE_TO_CHANGE"

exit 1

else

# Replace semver in VERSIONFILE with semver obtained from SOURCE_FILE

TMPFILE=$(mktemp /tmp/new_version.XXXXXX)

# Check sed version, exit if version < 4.3

if ! sed --version > /dev/null 2>&1; then

CURRENT_VERSION=1.archaic

else

CURRENT_VERSION=$(sed --version | head -n1 | cut -d" " -f4)

fi

REQUIRED_VERSION="4.3"

if [ "$(printf '%s\n' "$REQUIRED_VERSION" "$CURRENT_VERSION" | sort -V | head -n1)" != "$REQUIRED_VERSION" ]; then

echo "sed version must be >= ${REQUIRED_VERSION}" && exit 1

fi

sed -E -r "s/$RE_SEMVER/$UPDATED_VERSION/" "$FILE_TO_CHANGE" > "$TMPFILE"

if [ $CHECK == 1 ];

then

DIFF=$(diff "$FILE_TO_CHANGE" "$TMPFILE" )

if [ -z "$DIFF" ];

then

printf "version sync would make no changes to %s.\n" "$FILE_TO_CHANGE"

rm "$TMPFILE"

else

FAILED_CHECK=1

printf "version sync would make the following changes to %s:\n%s\n" "$FILE_TO_CHANGE" "$DIFF"

rm "$TMPFILE"

fi

else

cp "$TMPFILE" "$FILE_TO_CHANGE"

rm "$TMPFILE"

fi

fi

done

# Exit with code determined by whether changes were needed in a check.

if [ ${FAILED_CHECK} -ne 0 ]; then

exit 1

else

exit 0

fi