From c98eae0523af742085d409d6ba899a087d34790b Mon Sep 17 00:00:00 2001
From: Ivan Ilves <ivan.ilves@typeform.com>
Date: Tue, 11 Oct 2022 22:02:48 +0200
Subject: [PATCH] chore: add application version support

---
 Makefile                         | 43 ++++++++++++++++++++++++++++----
 README.md                        |  9 +++++++
 cmd/ttg/main.go                  |  8 ++++++
 pkg/shell/shell.go               |  7 ++++++
 scripts/github-create-release.sh | 30 ++++++++++++++++++++++
 scripts/github-upload-assets.sh  | 34 +++++++++++++++++++++++++
 6 files changed, 126 insertions(+), 5 deletions(-)
 create mode 100755 scripts/github-create-release.sh
 create mode 100755 scripts/github-upload-assets.sh

diff --git a/Makefile b/Makefile
index e2b74aa..e378e5a 100644
--- a/Makefile
+++ b/Makefile
@@ -1,4 +1,12 @@
-APP_NAME     := ttg
+APP_NAME    := ttg
+GITHUB_REPO := ivanilves/ttg
+API_VERSION := 0.1
+
+APP_VERSION   := $(shell (git fetch --tags && git tag --sort=creatordate | grep -F "v${API_VERSION}." || echo UNDEFINED) | tail -n1)
+CURRENT_PATCH := $(shell (git fetch --tags && git tag --sort=creatordate | grep -F "v${API_VERSION}." || echo -1) | tail -n1 | sed -r "s/^v([0-9]+\.){2}//")
+NEXT_PATCH    := $(shell expr ${CURRENT_PATCH} + 1)
+NEXT_VERSION  := v${API_VERSION}.${NEXT_PATCH}
+
 BUILD_PATH   := ./cmd/${APP_NAME}
 RELEASE_PATH := ./release
 
@@ -19,11 +27,19 @@ install: PREFIX := /usr/local
 install:
 	install ${BUILD_PATH}/ttg ${PREFIX}/bin/
 
-release-binary: GOOS   ?= $(shell uname -s | tr '[A-Z]' '[a-z]')
-release-binary: GOARCH ?= $(shell uname -m | sed 's/x86_64/amd64/')
+changelog: LAST_RELEASED_TAG:=$(shell git tag --sort=creatordate | tail -n1)
+changelog: GITHUB_COMMIT_URL:=https://github.com/${GITHUB_REPO}/commit
+changelog:
+	@echo "## Changelog" \
+  && git log --oneline --reverse ${LAST_RELEASED_TAG}..HEAD | egrep -iv "^[0-9a-f]{7,} (Merge pull request |Merge branch |.*NORELEASE)" | \
+	sed -r "s|^([0-9a-f]{7,}) (.*)|* [\`\1\`](${GITHUB_COMMIT_URL}/\1) \2|"
+
+release-binary: GOOS    ?= $(shell uname -s | tr '[A-Z]' '[a-z]')
+release-binary: GOARCH  ?= $(shell uname -m | sed 's/x86_64/amd64/')
+release-binary: LDFLAGS := "-X 'main.appVersion=${NEXT_VERSION}'"
 release-binary:
 	mkdir -p ${RELEASE_PATH}/${APP_NAME}-${GOOS}-${GOARCH} && cd ${BUILD_PATH} && \
-		GOOS=${GOOS} GOARCH=${GOARCH} go build -mod=vendor -o ../../${RELEASE_PATH}/${APP_NAME}-${GOOS}-${GOARCH}/${APP_NAME}
+		GOOS=${GOOS} GOARCH=${GOARCH} go build -mod=vendor -ldflags ${LDFLAGS} -o ../../${RELEASE_PATH}/${APP_NAME}-${GOOS}-${GOARCH}/${APP_NAME}
 
 release-binaries:
 	${MAKE} --no-print-directory release-binary GOOS=linux  GOARCH=amd64
@@ -33,4 +49,21 @@ release-binaries:
 release-artifacts:
 	cd ${RELEASE_PATH} && find . -mindepth 1 -maxdepth 1 -type d | xargs -i tar -C {} -zc ${APP_NAME} -f {}.tar.gz
 
-release: release-binaries release-artifacts
+release-metadata:
+	echo ${NEXT_VERSION} >${RELEASE_PATH}/TAG
+	echo ${NEXT_VERSION} >${RELEASE_PATH}/NAME
+	${MAKE} --no-print-directory changelog >${RELEASE_PATH}/CHANGELOG.md
+	cp -f README.md ${RELEASE_PATH}/
+
+release: release-binaries release-artifacts release-metadata
+
+next-version-tag:
+	git tag ${NEXT_VERSION}
+
+github-release:
+	scripts/github-create-release.sh ${GITHUB_REPO} ./release
+
+github-assets:
+	scripts/github-upload-assets.sh ${GITHUB_REPO} ./release
+
+github: github-release github-assets
diff --git a/README.md b/README.md
index e9f566b..26dee23 100644
--- a/README.md
+++ b/README.md
@@ -26,3 +26,12 @@ experience, i.e. you will need to exit subshell before you "jump" to the next pr
 * `make dep` - install dependencies;
 * `make build` - build the `ttg` binary in `cmd/ttg` path;
 * `make install` - [optional] install built `ttg` binary under the `${PREFIX}/bin` location;
+
+## How to release a new version?
+
+:bulb: Set `GITHUB_TOKEN` environmental variable.
+
+* `make release` - create release artifacts;
+* `make next-version-tag` - tag your HEAD with the incremented version;
+* `git push --tags` - push your new tag to Git;
+* `make github` - create a GitHub release using your artifacts;
diff --git a/cmd/ttg/main.go b/cmd/ttg/main.go
index 5766456..9c74e1a 100644
--- a/cmd/ttg/main.go
+++ b/cmd/ttg/main.go
@@ -12,9 +12,13 @@ import (
 	"github.com/ivanilves/ttg/pkg/shell"
 )
 
+var appVersion = "default"
+
+var version bool
 var outFile string
 
 func init() {
+	flag.BoolVar(&version, "version", false, "print application version and exit")
 	flag.StringVar(&outFile, "outFile", "", "output project path into the file specified instead of spawning a shell")
 }
 
@@ -33,6 +37,10 @@ func main() {
 	flag.Usage = usage
 	flag.Parse()
 
+	if version {
+		shell.PrintAndExit(appVersion)
+	}
+
 	matches := flag.Args()
 
 	rootPath, err := scm.RootPath()
diff --git a/pkg/shell/shell.go b/pkg/shell/shell.go
index c29832a..d486ec8 100644
--- a/pkg/shell/shell.go
+++ b/pkg/shell/shell.go
@@ -51,3 +51,10 @@ func Spawn(path string) error {
 
 	return cmd.Run()
 }
+
+// PrintAndExit prints a string passed and exits after
+func PrintAndExit(s string) {
+	fmt.Printf("%s\n", s)
+
+	os.Exit(0)
+}
diff --git a/scripts/github-create-release.sh b/scripts/github-create-release.sh
new file mode 100755
index 0000000..9f3d6e7
--- /dev/null
+++ b/scripts/github-create-release.sh
@@ -0,0 +1,30 @@
+#!/usr/bin/env bash
+#
+if [[ ${#} -ne 2 ]]; then
+  echo "Create release on GitHub"
+  echo "Usage: ${0} GITHUB_REPO RELEASE_PATH" >>/dev/stderr
+  exit 1
+fi
+
+if [[ -z "${GITHUB_TOKEN}" ]]; then
+  echo "GITHUB_TOKEN not set" >>/dev/stderr
+  exit 1
+fi
+
+set -euo pipefail
+
+declare -r GITHUB_REPO="${1}"
+declare -r RELEASE_PATH="${2}"
+
+declare -r API_URL=https://api.github.com/repos/${GITHUB_REPO}/releases
+
+pushd "${RELEASE_PATH}"
+  declare -r TAG="$(cat TAG)"
+  declare -r NAME="$(cat NAME)"
+  declare -r BODY="$(sed 's/$/\\n/' CHANGELOG.md | tr -d '\n' | sed 's/\"/\\"/g')"
+  declare -r DATA="{\"tag_name\":\"${TAG}\", \"target_commitish\": \"main\",\"name\": \"${NAME}\", \"body\": \"${BODY}\", \"draft\": false, \"prerelease\": false}"
+
+  curl -f -X POST -H "Content-Type:application/json" \
+    -H "Authorization: Token ${GITHUB_TOKEN}" "${API_URL}" \
+    -d "${DATA}"
+popd
diff --git a/scripts/github-upload-assets.sh b/scripts/github-upload-assets.sh
new file mode 100755
index 0000000..3560d5c
--- /dev/null
+++ b/scripts/github-upload-assets.sh
@@ -0,0 +1,34 @@
+#!/usr/bin/env bash
+#
+if [[ ${#} -ne 2 ]]; then
+  echo "Upload assets to GitHub release"
+  echo "Usage: ${0} GITHUB_REPO ASSETS_PATH" >>/dev/stderr
+  exit 1
+fi
+
+if [[ -z "${GITHUB_TOKEN}" ]]; then
+  echo "GITHUB_TOKEN not set" >>/dev/stderr
+  exit 1
+fi
+
+set -euo pipefail
+
+declare -r GITHUB_REPO="${1}"
+declare -r ASSETS_PATH="${2}"
+
+declare -r API_URL=https://api.github.com/repos/${GITHUB_REPO}/releases
+declare -r UPLOAD_URL=https://uploads.github.com/repos/${GITHUB_REPO}/releases
+
+pushd "${ASSETS_PATH}"
+  declare -r TAG="$(cat TAG)"
+
+  ID=$(curl -s -H "Authorization: Token ${GITHUB_TOKEN}" "${API_URL}/tags/${TAG}" | jq ".id")
+
+  for FILE in $(find ./ -mindepth 1 -maxdepth 1 -type f -name "*.tar.gz"); do
+    curl -f -H "Content-Type: $(file -b --mime-type ${FILE})" \
+      -H "Authorization: Token ${GITHUB_TOKEN}" \
+      --data-binary @${FILE} \
+      "${UPLOAD_URL}/${ID}/assets?name=$(basename ${FILE})"
+    echo
+  done
+popd