initial version

Dockerfile

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+FROM alpine:3.10
+
+RUN apk --no-cache add git jq curl
+
+COPY entrypoint.sh /entrypoint.sh
+
+ENTRYPOINT ["/entrypoint.sh"]

LICENSE

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+MIT License
+
+Copyright (c) 2020 haya14busa
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

action.yml

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+name: 'Bump version in code to latest semantic ver release'
+description: 'Bump version in code to latest semantic ver release. (e.g. REVIEWDOG=0.9.17 in Dockerfile)'
+author: 'haya14busa'
+inputs:
+  github_token:
+    description: 'GITHUB_TOKEN to get latest version with GitHub Release API'
+    default: '${{ github.token }}'
+  file:
+    description: 'target file'
+    required: true
+  version_name:
+    description: 'target version name. e.g. REVIEWDOG_VERSION'
+    required: true
+  repo:
+    description: 'target GitHub repository. e.g. reviewdog/reviewdog'
+    required: true
+runs:
+  using: 'docker'
+  image: 'Dockerfile'
+# Ref: https://haya14busa.github.io/github-action-brandings/
+branding:
+  icon: 'refresh-cw'
+  color: 'orange'

entrypoint.sh

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+#!/bin/sh
+set -e
+
+if [ ! -z "${GITHUB_WORKSPACE}" ]; then
+  cd "${GITHUB_WORKSPACE}" || exit
+fi
+
+FILE="${INPUT_FILE:-Dockerfile}"
+REPO="${INPUT_REPO:-reviewdog/reviewdog}"
+VERSION_NAME="${INPUT_VERSION_NAME:-REVIEWDOG_VERSION}"
+
+# Get current version.
+CURRENT_VERSION=$(grep -oP "${VERSION_NAME}=\K\d+\.\d+\.\d+" "${FILE}")
+if [ -z "${CURRENT_VERSION}" ]; then
+  echo "cannot parse ${VERSION_NAME}"
+  exit 1
+fi
+echo "Current ${VERSION_NAME}=${CURRENT_VERSION}"
+
+# Get latest semantic version release tag name from GitHub Release API.
+GITHUB_AUTH_HEADER=""
+if [ ! -z "${INPUT_GITHUB_TOKEN}" ]; then
+  GITHUB_AUTH_HEADER="-H \"Authorization: token ${INPUT_GITHUB_TOKEN}\""
+  echo "Use INPUT_GITHUB_TOKEN to get release data."
+else
+  echo "INPUT_GITHUB_TOKEN is not available. Subscequent GitHub API call can fail due to API limit."
+fi
+
+LATEST_VERSION=$(\
+  curl -s ${GITHUB_AUTH_HEADER} https://api.github.com/repos/${REPO}/releases | \
+  jq -r '.[] | .tag_name' | \
+  sed 's/^v//' | \
+  grep -P '\d+\.\d+\.\d+' | \
+  sort --version-sort --reverse | \
+  head -n1
+)
+if [ -z "${LATEST_VERSION}" ]; then
+  echo "cannot get latest ${REPO} version"
+  exit 1
+fi
+echo "Latest ${VERSION_NAME}=${LATEST_VERSION}"
+
+if [ "${CURRENT_VERSION}" = "${LATEST_VERSION}" ]; then
+  echo "${VERSION_NAME} is latest. Nothing to do."
+  exit 0
+fi
+
+echo "Updating ${VERSION_NAME} to ${LATEST_VERSION} in ${FILE}"
+sed -i "s/\(${VERSION_NAME}=\)\([0-9]\+\.[0-9]\+\.\?[0-9]\+\)/\1${LATEST_VERSION}/" "${FILE}"
+
+echo "Updated. Commit and create Pull-Request as you need."
+echo "::set-output name=current::${CURRENT_VERSION}"
+echo "::set-output name=latest::${LATEST_VERSION}"