Allow passing a file-path as PR body

Sometimes the PR body contains a lot of information. In this case
passing it as argument to the action will cause a shell error of having
an argument list that's too long. To circumvent this we provide the
option of providing a file path that is loaded by Node instead.

We prefer the file-path but fall back to the body.

action.yml

@@ -54,6 +54,8 @@ inputs:
   body:
     description: 'The body of the pull request.'
     default: 'Automated changes by [create-pull-request](https://github.com/peter-evans/create-pull-request) GitHub action'
+  body-file:
+    description: 'Use the contents of this file as body rather than the body parameter.'
   labels:
     description: 'A comma or newline separated list of labels.'
   assignees:

dist/index.js

@@ -1092,6 +1092,7 @@ var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, ge
 Object.defineProperty(exports, "__esModule", ({ value: true }));
 const core = __importStar(__nccwpck_require__(2186));
 const create_pull_request_1 = __nccwpck_require__(3780);
+const fs_1 = __nccwpck_require__(7147);
 const util_1 = __nccwpck_require__(3837);
 const utils = __importStar(__nccwpck_require__(918));
 function run() {
@@ -1111,7 +1112,12 @@ function run() {
                 base: core.getInput('base'),
                 pushToFork: core.getInput('push-to-fork'),
                 title: core.getInput('title'),
-                body: core.getInput('body'),
+                body: core.getInput('body-file') !== ''
+                    ? (0, fs_1.readFileSync)(core.getInput('body-file'), {
+                        encoding: 'utf8',
+                        flag: 'r'
+                    })
+                    : core.getInput('body'),
                 labels: utils.getInputAsArray('labels'),
                 assignees: utils.getInputAsArray('assignees'),
                 reviewers: utils.getInputAsArray('reviewers'),

src/main.ts

@@ -1,5 +1,6 @@
 import * as core from '@actions/core'
 import {Inputs, createPullRequest} from './create-pull-request'
+import {readFileSync} from 'fs'
 import {inspect} from 'util'
 import * as utils from './utils'
 
@@ -19,7 +20,13 @@ async function run(): Promise<void> {
       base: core.getInput('base'),
       pushToFork: core.getInput('push-to-fork'),
       title: core.getInput('title'),
-      body: core.getInput('body'),
+      body:
+        core.getInput('body-file') !== ''
+          ? readFileSync(core.getInput('body-file'), {
+              encoding: 'utf8',
+              flag: 'r'
+            })
+          : core.getInput('body'),
       labels: utils.getInputAsArray('labels'),
       assignees: utils.getInputAsArray('assignees'),
       reviewers: utils.getInputAsArray('reviewers'),