Initial commit

Dockerfile

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+FROM alpine/git:latest
+
+RUN apk add --no-cache bash findutils
+COPY entrypoint.sh /
+RUN chmod +x /entrypoint.sh
+
+ENTRYPOINT ["/entrypoint.sh"]

LICENSE.md

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+Copyright 2019 Read Evaluate Press, LLC
+
+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.

README.md

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+# Github Wiki Publish Action
+
+This [GitHub Action][github actions]
+publishes the contents of a directory to your project's [wiki][github wiki]
+from a workflow.
+
+## Setup
+
+This GitHub action requires that your repository has the following:
+
+- A wiki with at least one page in it
+- A secret named `GITHUB_PERSONAL_ACCESS_TOKEN`
+  with a Github personal access token with "repo" authorization
+
+Follow the steps below to ensure that everything's configured correctly.
+
+> **Note**
+> GitHub doesn't currently provide APIs for interacting with project wikis,
+> so much of the required setup must be done manually.
+
+### 1. Enable Your Repository's Wikis Feature
+
+Navigate to the "Settings" tab for your repository,
+scroll down to the "Features" section,
+and ensure that the checkbox labeled "Wikis" is checked.
+
+![GitHub Wikis Feature](https://user-images.githubusercontent.com/7659/72726104-5f3aff80-3b3c-11ea-8f2e-fe73aff0276b.png)
+
+### 2. Create the First Wiki Page
+
+With the Wikis feature enabled for your repository,
+navigate to the "Wiki" tab.
+If prompted,
+create the first wiki page.
+
+![GitHub Wiki Create First Page](https://user-images.githubusercontent.com/7659/72726186-927d8e80-3b3c-11ea-8014-4622f8ff3226.png)
+
+### 3. Generate a Personal Access Token
+
+Navigate to the [Personal access tokens](https://github.com/settings/tokens) page 
+in your GitHub account settings
+(Settings > Developer settings > Personal access tokens)
+and click the "Generate a new token" button.
+
+In the "New personal access token" form,
+provide a descriptive comment in the "Note" field, like "Wiki Management".
+Under "Select scopes",
+enable all of the entries under "repo" perms.
+
+When you're done,
+click the "Generate token" button at the bottom of the form.
+
+![GitHub Personal Access Token Select Scopes](https://user-images.githubusercontent.com/7659/72726210-9f9a7d80-3b3c-11ea-81b4-528de92fb9fa.png)
+
+> **Note**: 
+> GitHub actions have access to [a `GITHUB_TOKEN` secret][GITHUB_TOKEN],
+> but that token's permissions are limited to 
+> the repository that contains your workflow.
+> This workflow requires the generation of a new personal acccess token
+> to read and write to the git repository for your project's wiki.
+
+### 4. Set a Repository Secret
+
+Copy your generated personal access token to the clipboard
+and navigate to your project settings.
+Navigate to the "Secrets" page,
+click "Add a new secret",
+and fill in the form by 
+entering `GITHUB_PERSONAL_ACCESS_TOKEN` into the "Name" field and 
+pasting your token into the "Value" field.
+
+## License
+
+MIT
+
+## Contact
+
+Mattt ([@mattt](https://twitter.com/mattt))
+
+[github actions]: https://help.github.com/en/actions
+[github wiki]: https://help.github.com/en/github/building-a-strong-community/about-wikis
+[GITHUB_TOKEN]: https://help.github.com/en/actions/automating-your-workflow-with-github-actions/authenticating-with-the-github_token#about-the-github_token-secret

action.yml

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+name: "Publish to GitHub Wiki"
+description: "Pushes files to a GitHub project's wiki"
+
+inputs:
+  path:
+    description: "A path to the directory of files to publish"
+    required: true
+
+runs:
+  using: "docker"
+  image: "Dockerfile"
+  args: ["${{ inputs.path }}"]
+
+branding:
+  icon: "book-open"
+  color: "black"

entrypoint.sh

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+#!/bin/bash
+
+function debug() {
+    echo "::debug file=${BASH_SOURCE[0]},line=${BASH_LINENO[0]}::$1"
+}
+
+function warning() {
+    echo "::warning file=${BASH_SOURCE[0]},line=${BASH_LINENO[0]}::$1"
+}
+
+function error() {
+    echo "::error file=${BASH_SOURCE[0]},line=${BASH_LINENO[0]}::$1"
+}
+
+function add_mask() {
+    echo "::add-mask::$1"
+}
+
+if [ -z "$GITHUB_ACTOR" ]; then
+    error "GITHUB_ACTOR environment variable is not set"
+    exit 1
+fi
+
+if [ -z "$GITHUB_REPOSITORY" ]; then
+    error "GITHUB_REPOSITORY environment variable is not set"
+    exit 1
+fi
+
+if [ -z "$GITHUB_PERSONAL_ACCESS_TOKEN" ]; then
+    error "GITHUB_PERSONAL_ACCESS_TOKEN environment variable is not set"
+    exit 1
+fi
+
+add_mask "${GITHUB_PERSONAL_ACCESS_TOKEN}"
+
+if [ -z "${WIKI_COMMIT_MESSAGE:-}" ]; then
+    debug "WIKI_COMMIT_MESSAGE not set, using default"
+    WIKI_COMMIT_MESSAGE='Automatically publish wiki'
+fi
+
+GIT_REPOSITORY_URL="https://${GITHUB_PERSONAL_ACCESS_TOKEN}@github.com/$GITHUB_REPOSITORY.wiki.git"
+
+debug "Checking out wiki repository"
+tmp_dir=$(mktemp -d -t ci-XXXXXXXXXX)
+(
+    cd "$tmp_dir" || exit 1
+    git init
+    git config user.name "$GITHUB_ACTOR"
+    git config user.email "$GITHUB_ACTOR@users.noreply.github.com"
+    git pull "$GIT_REPOSITORY_URL"
+)
+
+debug "Enumerating contents of $1"
+for file in $(find $1 -maxdepth 1 -type f -name '*.md' -execdir basename '{}' ';'); do
+    debug "Copying $file"
+    cp "$1/$file" "$tmp_dir"
+done
+
+debug "Committing and pushing changes"
+(
+    cd "$tmp_dir" || exit 1
+    git add .
+    git commit -m "$WIKI_COMMIT_MESSAGE"
+    git push --set-upstream "$GIT_REPOSITORY_URL" master
+)
+
+rm -rf "$tmp_dir"
+exit 0