Add action input for scala-cli version, default to latest (#7)

* Add action input for scala-cli version, default to latest

* Not default to latest scala-cli version.

* Add scala-cli-version to action config, add "latest" as a possible value of scala-cli-version.

Author: ptrdom

.gitignore

@@ -97,3 +97,5 @@ Thumbs.db
 # Ignore built ts files
 __tests__/runner/*
 lib/**/*
+
+.idea

README.md

@@ -11,6 +11,8 @@ A GitHub Action to install Scala CLI.
 
 ## Inputs
 
+- `scala-cli-version` (optional): scala-cli version to install
+  - "latest" to install the latest version.
 - `jvm` (optional): JVM to install
   - one of the options from `cs java --available`.
   - if left empty either the existing JVM will be used or Coursier will install its default JVM.

action.yml

@@ -5,6 +5,9 @@ branding:
   icon: 'anchor'
   color: 'green'
 inputs:
+  scala-cli-version:
+    description: 'Version of scala-cli to install ("latest" to install the latest version)'
+    required: false
   jvm:
     description: 'JVM to install (leave empty to use default)'
     required: false

dist/index.js

@@ -98,13 +98,24 @@ async function run(): Promise<void> {
 
     await core.group('Install Apps', async () => {
       const apps: string[] = core.getInput('apps').split(' ')
-      apps.push(`scala-cli:${scalaCLIVersion}`)
+      const scalaCLIVersionInput = core.getInput('scala-cli-version')
+      let version
+      if (scalaCLIVersionInput) {
+        if (scalaCLIVersionInput === 'latest') {
+          version = ''
+        } else {
+          version = scalaCLIVersionInput
+        }
+      } else {
+        version = scalaCLIVersion
+      }
+      apps.push(`scala-cli${version ? `:${version}` : ''}`)
       if (apps.length) {
         const coursierBinDir = path.join(os.homedir(), 'cs', 'bin')
         core.exportVariable('COURSIER_BIN_DIR', coursierBinDir)
         core.addPath(coursierBinDir)
         await cs('install', '--contrib', ...apps)
-        core.setOutput('scala-cli-version', scalaCLIVersion)
+        core.setOutput('scala-cli-version', await execOutput('scala-cli', 'version'))
       }
     })
   } catch (error: any) {