Sarpik/get input list support (#829)

* feat(core): Create `getInputList` utility

Signed-off-by: Kipras Melnikovas <kipras@kipras.org>

* chore(core): Document usage of '\n' instead of [] @ `getInputList`

Signed-off-by: Kipras Melnikovas <kipras@kipras.org>

* test(core): Create a very simple test for `getInputList`

Signed-off-by: Kipras Melnikovas <kipras@kipras.org>

* run linter

* update commands/readme

Co-authored-by: Kipras Melnikovas <kipras@kipras.org>

Author: thboop

packages/core/README.md

@@ -23,6 +23,7 @@ Outputs can be set with `setOutput` which makes them available to be mapped into
 ```js
 const myInput = core.getInput('inputName', { required: true });
 const myBooleanInput = core.getBooleanInput('booleanInputName', { required: true });
+const myMultilineInput = core.getMultiline('multilineInputName', { required: true });
 core.setOutput('outputKey', 'outputVal');
 ```
 

packages/core/__tests__/core.test.ts

@@ -29,6 +29,8 @@ const testEnvVars = {
   INPUT_WRONG_BOOLEAN_INPUT: 'wrong',
   INPUT_WITH_TRAILING_WHITESPACE: '  some val  ',
 
+  INPUT_MY_INPUT_LIST: 'val1\nval2\nval3',
+
   // Save inputs
   STATE_TEST_1: 'state_val',
 
@@ -166,6 +168,14 @@ describe('@actions/core', () => {
     )
   })
 
+  it('getMultilineInput works', () => {
+    expect(core.getMultilineInput('my input list')).toEqual([
+      'val1',
+      'val2',
+      'val3'
+    ])
+  })
+
   it('getInput trims whitespace by default', () => {
     expect(core.getInput('with trailing whitespace')).toBe('some val')
   })

packages/core/src/core.ts

@@ -100,6 +100,25 @@ export function getInput(name: string, options?: InputOptions): string {
   return val.trim()
 }
 
+/**
+ * Gets the values of an multiline input.  Each value is also trimmed.
+ *
+ * @param     name     name of the input to get
+ * @param     options  optional. See InputOptions.
+ * @returns   string[]
+ *
+ */
+export function getMultilineInput(
+  name: string,
+  options?: InputOptions
+): string[] {
+  const inputs: string[] = getInput(name, options)
+    .split('\n')
+    .filter(x => x !== '')
+
+  return inputs
+}
+
 /**
  * Gets the input value of the boolean type in the YAML 1.2 "core schema" specification.
  * Support boolean input list: `true | True | TRUE | false | False | FALSE` .