initial commit.

.prettierrc.js

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+module.exports = {
+    trailingComma: 'es5',
+    printWidth: 100,
+    tabWidth: 4,
+    semi: true,
+    singleQuote: true,
+    overrides: [
+        {
+            files: '*.md',
+            options: {
+                tabWidth: 2,
+            },
+        },
+    ],
+};

README.md

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+# gh-find-current-pr
+
+This action tries to figure out the current PR.
+
+If the event is a `pull_request`, it's very easy to get the current PR number
+from the context via `${{ github.event.number }}`, but unfortunately this
+information does not seem to be readily available for a `push` event.  This
+action sends a request to GitHub to find the PR associated with the current SHA,
+and returns it in the `pr` output.
+
+## Usage
+
+```yaml
+    steps:
+      - uses: actions/checkout@v1
+      # Find the PR associated with this push, if there is one.
+      - uses: jwalton/gh-find-current-pr@v1
+        id: findPr
+        with:
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+      # This will echo "Your PR is 7", or be skipped if there is no current PR.
+      - run: echo "Your PR is ${PR}"
+        if: success() && steps.findPr.outputs.pr
+        env:
+          PR: ${{ steps.findPr.outputs.pr }}
+```

action.yml

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+name: gh-find-current-pr
+author: jwalton
+description: Find a PR associated with the current commit.
+inputs:
+  github-token:
+    description: The GitHub token used to create an authenticated client.
+  sha:
+    description: Sha to get PR for.  Defaults to current sha.
+    required: false
+outputs:
+  pr:
+    description: The PR if one was found. (e.g. '345' for #345)
+runs:
+  using: node12
+  main: 'main.js'
+branding:
+  icon: git-pull-request
+  color: blue

main.js

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+const core = require('@actions/core');
+const { GitHub, context } = require('@actions/github');
+
+async function main() {
+    const token = core.getInput('github-token', { required: true });
+    const sha = core.getInput('sha');
+
+    const client = new GitHub(token, {});
+    const result = await client.repos.listPullRequestsAssociatedWithCommit({
+        owner: context.repo.owner,
+        repo: context.repo.repo,
+        commit_sha: sha || context.sha,
+    });
+
+    const pr = result.data.length > 0 && result.data[0].number;
+
+    core.setOutput('pr', pr || '');
+}
+
+main().catch(err => core.setFailed(err.message));