Fall back to default inputs (#139)

This PR adds a check so that, if an input is not present in the
environment variables, the default value is used from the
`action.yml`/`action.yaml` file (if a default is present).

__tests__/stubs/core/core.test.ts

@@ -178,6 +178,21 @@ describe('Core', () => {
         expect(getInput('test')).toEqual('test-lower')
       })
 
+      it('Gets default inputs', () => {
+        delete process.env.INPUT_TEST
+        delete process.env.INPUT_test
+
+        EnvMeta.inputs = {
+          test: {
+            description: 'test',
+            required: true,
+            default: 'default'
+          }
+        }
+
+        expect(getInput('test')).toEqual('default')
+      })
+
       it('Returns an empty string', () => {
         expect(getInput('test-input-missing')).toEqual('')
       })
@@ -214,6 +229,21 @@ describe('Core', () => {
         ])
       })
 
+      it('Gets default inputs', () => {
+        delete process.env.INPUT_TEST
+        delete process.env.INPUT_test
+
+        EnvMeta.inputs = {
+          test: {
+            description: 'test',
+            required: true,
+            default: 'default'
+          }
+        }
+
+        expect(getMultilineInput('test')).toEqual(['default'])
+      })
+
       it('Returns an empty list if the input is not found', () => {
         expect(getMultilineInput('test-input-missing')).toMatchObject([])
       })
@@ -246,6 +276,21 @@ describe('Core', () => {
         expect(getBooleanInput('test')).toBeFalsy()
       })
 
+      it('Gets default inputs', () => {
+        delete process.env.INPUT_TEST
+        delete process.env.INPUT_test
+
+        EnvMeta.inputs = {
+          test: {
+            description: 'test',
+            required: true,
+            default: 'false'
+          }
+        }
+
+        expect(getBooleanInput('test')).toEqual(false)
+      })
+
       it('Throws an error if the input is required and not found', () => {
         expect(() =>
           getBooleanInput('test-input-missing', {

package.json

@@ -1,7 +1,7 @@
 {
   "name": "@github/local-action",
   "description": "Local Debugging for GitHub Actions",
-  "version": "2.4.0",
+  "version": "2.5.0",
   "type": "module",
   "author": "Nick Alteen <[email protected]>",
   "private": false,

src/stubs/core/core.ts

@@ -200,6 +200,11 @@ export function getInput(name: string, options?: InputOptions): string {
     process.env[`INPUT_${name.replace(/ /g, '_')}`] ||
     ''
 
+  // If the input is not present in the environment variables, it has not been
+  // set. In that case, check the default value.
+  if (input === '' && EnvMeta.inputs[name]?.default !== undefined)
+    input = EnvMeta.inputs[name].default.toString()
+
   // Throw an error if the input is required and not supplied
   if (options && options.required === true && input === '')
     throw new Error(`Input required and not supplied: ${name}`)
@@ -224,14 +229,22 @@ export function getMultilineInput(
   options?: InputOptions
 ): string[] {
   // Get input by name, split by newline, and filter out empty strings
-  const input: string[] = (
+  let input: string[] = (
     process.env[`INPUT_${name.replace(/ /g, '_').toUpperCase()}`] ||
     process.env[`INPUT_${name.replace(/ /g, '_')}`] ||
     ''
   )
     .split('\n')
     .filter(x => x !== '')
 
+  // If the input is not present in the environment variables, it has not been
+  // set. In that case, check the default value.
+  if (input.length === 0 && EnvMeta.inputs[name]?.default !== undefined)
+    input = EnvMeta.inputs[name].default
+      .toString()
+      .split('\n')
+      .filter(x => x !== '')
+
   // Throw an error if the input is required and not supplied
   if (options && options.required === true && input.length === 0)
     throw new Error(`Input required and not supplied: ${name}`)
@@ -257,12 +270,17 @@ export function getBooleanInput(name: string, options?: InputOptions): boolean {
   // using proxyquire's `callThru()` option.
 
   // Get input by name, or an empty string if not found
-  const input: string = (
+  let input: string = (
     process.env[`INPUT_${name.replace(/ /g, '_').toUpperCase()}`] ||
     process.env[`INPUT_${name.replace(/ /g, '_')}`] ||
     ''
   ).trim()
 
+  // If the input is not present in the environment variables, it has not been
+  // set. In that case, check the default value.
+  if (input === '' && EnvMeta.inputs[name]?.default !== undefined)
+    input = EnvMeta.inputs[name].default.trim()
+
   // Throw an error if the input is required and not supplied
   if (options && options.required === true && input === '')
     throw new Error(`Input required and not supplied: ${name}`)