Merge pull request #20 from reproio/feat/add-action

support GitHub Action

README.md

@@ -1,5 +1,5 @@
-terraform-j2md
-===
+# terraform-j2md
+
 ![Go](https://github.com/reproio/terraform-j2md/workflows/Go/badge.svg)
 ![goreleaser](https://github.com/reproio/terraform-j2md/workflows/goreleaser/badge.svg)
 
@@ -11,18 +11,27 @@ _terraform-j2md_ is simple conversion tool, from Terraform JSON to Markdown text
 
 Output texts may be useful as pull-request comments, and so on.
 
-## How to use
+## Install
+
+```
+% go install github.com/reproio/terraform-j2md/cmd/terraform-j2md@latest
+```
+
+### GitHub Actions
 
-### Installation
-(TBD)
+```yaml
+- uses: reproio/terraform-j2md@main
+  with:
+    version: v0.0.7 # or latest
+```
 
-### Usage
+## Usage
 _terraform-j2md_ reads only standard input, write only standard output.
 ```
 terraform-j2md < [input file] > [output file]
 ```
 
-### Example
+## Example
 ````sh
 $ terraform init
 $ terraform plan -out plan.tfplan

action.yml

@@ -0,0 +1,36 @@
+name:
+description:
+inputs:
+  version:
+    description: "A version to install terraform-j2md"
+    default: latest
+    required: false
+  github-token:
+    description: ""
+    required: false
+    default: ${{ github.token }}
+runs:
+  using: "composite"
+  steps:
+    - shell: bash
+      env:
+        github_token: ${{ inputs.github-token }}
+      run: |
+        set -e
+        VERSION="${{ inputs.version }}"
+        if [ -n "${{ inputs.version-file }}" ]; then
+          VERSION="v$(cat ${{ inputs.version-file }})"
+        fi
+        api_request_args=("-sS")
+        if [[ -n "$github_token" ]]; then
+          api_request_args=("${api_request_args[@]}" -H "authorization: token $github_token")
+        fi
+        if [ "${VERSION}" = "latest" ]; then
+          DOWNLOAD_URL=$(curl "${api_request_args[@]}" https://api.github.com/repos/reproio/terraform-j2md/releases | jq -r '[.[] | select(.prerelease==false)][0].assets[].browser_download_url | select(match("Linux_x86_64"))')
+        else
+          DOWNLOAD_URL=https://github.com/reproio/terraform-j2md/releases/download/${VERSION}/terraform-j2md_Linux_x86_64.tar.gz
+        fi
+        cd /tmp
+        curl -sfL ${DOWNLOAD_URL} | tar xzvf -
+        sudo install -D terraform-j2md ${RUNNER_TOOL_CACHE}/terraform-j2md/terraform-j2md
+        echo "${RUNNER_TOOL_CACHE}/terraform-j2md" >> $GITHUB_PATH