Read input template-variables

action.yml

@@ -10,6 +10,9 @@ inputs:
     description: 'The path to the action configuration file'
     default: '.github/pr-commenter.yml'
     required: false
+  template-variables:
+    description: 'A string with a JSON that holds variables that will be used when rendering the Mustache templates'
+    required: false
 runs:
   using: 'node12'
   main: 'dist/index.js'

lib/run.js

@@ -24,6 +24,7 @@ const {
 async function run() {
   const token = core.getInput('github-token', { required: true });
   const configPath = core.getInput('config-file', { required: true });
+  const templateVariablesJSONString = core.getInput('template-variables', { required: false });
 
   const prNumber = getPrNumber();
   if (!prNumber) {
@@ -42,12 +43,26 @@ async function run() {
   const snippetIds = getMatchingSnippetIds(changedFiles, commentConfig);
   const previousComment = await getPreviousPRComment(client, prNumber);
 
+  let templateVariables = {};
+  if (templateVariablesJSONString) {
+    core.debug('Input template-variables was passed');
+    core.debug(templateVariablesJSONString);
+
+    try {
+      templateVariables = JSON.parse(templateVariablesJSONString);
+    } catch (error) {
+      core.warning('Failed to parse template-variables input as JSON. Continuing without template variables.');
+    }
+  } else {
+    core.debug('Input template-variables was not passed');
+  }
+
   if (shouldDeletePreviousComment(previousComment, snippetIds, commentConfig)) {
     core.info('removing previous comment');
     await deleteComment(client, previousComment);
   }
 
-  const commentBody = assembleCommentBody(snippetIds, commentConfig);
+  const commentBody = assembleCommentBody(snippetIds, commentConfig, templateVariables);
 
   if (shouldEditPreviousComment(previousComment, snippetIds, commentConfig)) {
     core.info('updating previous comment');

test/run.test.js

@@ -22,7 +22,7 @@ describe('run', () => {
     const fakeConfigPath = 'foo/config-file.yml';
     const fakeConfig = 'comment:\n'
       + '  on-update: recreate\n'
-      + '  header: Hello!\n'
+      + '  header: Hello {{name}}!\n'
       + '  footer: Bye!\n'
       + '  snippets:\n'
       + '    - id: snippet1\n'
@@ -49,6 +49,10 @@ describe('run', () => {
         return 'foo/config-file.yml';
       }
 
+      if (argument === 'template-variables') {
+        return '{"name": "Bob"}';
+      }
+
       return null;
     });
 
@@ -66,7 +70,7 @@ describe('run', () => {
       { user: { type: 'Bot' }, created_at: '2020-01-01' },
     ];
 
-    const commentBody = `${'Hello!\n\n'
+    const commentBody = `${'Hello Bob!\n\n'
       + 'This is snippet 1\n\n'
     + 'This is snippet 3\n\n'
     + 'Bye!\n\n'}${