Use correct syntax for empty YAML sequence

.github/workflows/test-integration.yml

@@ -72,7 +72,7 @@ jobs:
             libraries: |
               # The official Servo library is not compatible with ESP8266, but that platform has a bundled Servo lib
               # so there are no library dependencies
-              -
+              []
 
     steps:
       - name: Checkout
@@ -348,7 +348,7 @@ jobs:
           fqbn: arduino:avr:uno
           github-token: ${{ secrets.GITHUB_TOKEN }}
           libraries: |
-            -
+            []
           sketch-paths: |
             - ${{ env.TESTDATA_SKETCHES_PATH }}/Error
 

README.md

@@ -3,7 +3,7 @@
 [![Check Action Metadata status](https://github.com/arduino/compile-sketches/actions/workflows/check-action-metadata-task.yml/badge.svg)](https://github.com/arduino/compile-sketches/actions/workflows/check-action-metadata-task.yml)
 [![Check Files status](https://github.com/arduino/compile-sketches/actions/workflows/check-files-task.yml/badge.svg)](https://github.com/arduino/compile-sketches/actions/workflows/check-files-task.yml)
 [![Check General Formatting status](https://github.com/arduino/compile-sketches/actions/workflows/check-general-formatting-task.yml/badge.svg)](https://github.com/arduino/compile-sketches/actions/workflows/check-general-formatting-task.yml)
-[![Check License status](https://github.com/arduino/compile-sketches/actions/workflows/check-license.yml/badge.svg)](https://github.com/arduino/compile-sketches/actions/workflows/check-license.ym
+[![Check License status](https://github.com/arduino/compile-sketches/actions/workflows/check-license.yml/badge.svg)](https://github.com/arduino/compile-sketches/actions/workflows/check-license.yml)
 [![Check Markdown status](https://github.com/arduino/compile-sketches/actions/workflows/check-markdown-task.yml/badge.svg)](https://github.com/arduino/compile-sketches/actions/workflows/check-markdown-task.yml)
 [![Check npm status](https://github.com/arduino/compile-sketches/actions/workflows/check-npm-task.yml/badge.svg)](https://github.com/arduino/compile-sketches/actions/workflows/check-npm-task.yml)
 [![Check Prettier Formatting status](https://github.com/arduino/compile-sketches/actions/workflows/check-prettier-formatting-task.yml/badge.svg)](https://github.com/arduino/compile-sketches/actions/workflows/check-prettier-formatting-task.yml)
@@ -129,7 +129,7 @@ Keys:
 [YAML](https://en.wikipedia.org/wiki/YAML)-format list of library dependencies to install.
 
 **Default**: `"- source-path: ./"`
-This causes the repository to be installed as a library. If there are no library dependencies and you want to override the default, set the `libraries` input to an empty list (`- libraries: '-'`).
+This causes the repository to be installed as a library. If there are no library dependencies and you want to override the default, set the `libraries` input to an empty list (`- libraries: '[]'`).
 
 Libraries are installed under the Arduino user folder at `~/Arduino/libraries`.
 

action.yml

@@ -1,48 +1,64 @@
 name: "Compile Arduino Sketches"
-description: "Checks whether Arduino sketches will compile and produces a report of data from the compilations"
+description: >-
+  Checks whether Arduino sketches will compile and produces a report of data from the compilations
 inputs:
   cli-version:
-    description: "Version of Arduino CLI to use when building"
+    description: >-
+      Version of Arduino CLI to use when building
     default: "latest"
     required: true
   fqbn:
-    description: "Full qualified board name, with Boards Manager URL if needed"
+    description: >-
+      Full qualified board name, with Boards Manager URL if needed
     default: "arduino:avr:uno"
     required: true
   libraries:
-    description: "YAML-format list of library dependencies to install"
+    description: >-
+      YAML-format list of library dependencies to install
     default: "- source-path: ./"
     required: true
   platforms:
-    description: "YAML-format list of platform dependencies to install"
+    description: >-
+      YAML-format list of platform dependencies to install
     default: ""
     required: true
   sketch-paths:
-    description: "YAML-format list of paths containing sketches to compile."
+    description: >-
+      YAML-format list of paths containing sketches to compile.
     default: "- examples"
     required: true
   cli-compile-flags:
-    description: "YAML-format list of flags to add to the Arduino CLI sketch compilation command."
+    description: >-
+      YAML-format list of flags to add to the Arduino CLI sketch compilation command.
     default: ""
     required: false
   verbose:
-    description: "Set to true to show verbose output in the log"
+    description: >-
+      Set to true to show verbose output in the log
     default: "false"
     required: true
   sketches-report-path:
-    description: "Path in which to save a JSON formatted file containing data from the sketch compilations"
+    description: >-
+      Path in which to save a JSON formatted file containing data from the sketch compilations
     default: "sketches-reports"
     required: true
   github-token:
-    description: "GitHub access token used to get information from the GitHub API. Only needed if you are using the deltas report feature in a private repository."
+    description: >-
+      GitHub access token used to get information from the GitHub API.
+
+      Only needed if you are using the deltas report feature in a private repository.
     default: ""
     required: true
   enable-deltas-report:
-    description: "Set to true to cause the action to determine the change in memory usage and compiler warnings of the compiled sketches between the head and base refs of a PR and the immediate parent commit of a push"
+    description: >-
+      Set to true to cause the action to determine the change in memory usage and compiler warnings of the compiled
+      sketches between the head and base refs of a PR and the immediate parent commit of a push
     default: "false"
     required: true
   enable-warnings-report:
-    description: "Set to true to cause the action to record the compiler warning count for each sketch compilation in the sketches report"
+    description: >-
+      Set to true to cause the action to record the compiler warning count for each sketch compilation in the sketches
+      report
     default: "false"
     required: true
 

compilesketches/tests/test_compilesketches.py

@@ -1070,6 +1070,7 @@ def __init__(self):
             [],
         ),
         ("-", [], [], [], []),
+        ("[]", [], [], [], []),
         (
             "- " + compilesketches.CompileSketches.dependency_name_key + ": foo",
             [{compilesketches.CompileSketches.dependency_name_key: "foo"}],