index.js

const core = require("@actions/core");
const exec = require("@actions/exec");

async function run() {
  // set up listeners
  let myOutput = "";
  let myError = "";

  const options = {};
  options.listeners = {
    stdout: (data) => {
      myOutput += data.toString();
      core.info(data.toString());
    },
    stderr: (data) => {
      myError += data.toString();
    }
  };

  // set up workdir
  const workdir = core.getInput("project_directory");
  if (workdir) {
    options.cwd = workdir;
  }

  // fetch arguments for command
  // skip "parallel"
  // todo: can I extract these inputNames from the action.yml?
  const inputNames = [
    "query", "query_namespace", "query_name", "config", "src", "runner", "engine",
    "platform", "parallel", "config_mod", "target", "setup"
  ]
  const booleanInputs = ["parallel"]
  const multilineInputs = ["config_mod"]
  const inputArgs = inputNames.flatMap(function(argName) {
    const value = core.getInput(argName)
    if (value == "") {
      return [];
    } else if (booleanInputs.indexOf(argName) >= 0) {
      if (value.toLowerCase() == "true") {
        return ["--" + argName];
      } else {
        return [];
      }
    } else if (multilineInputs.indexOf(argName) >= 0) {
      const values = core.getMultilineInput(argName)
      return values.flatMap(function(value) {
        return ["--" + argName, value];
      })
    } else {
      return ["--" + argName, value];
    }
  })
  let args = ["ns", "build"].concat(inputArgs);

    // run command
  try {
    await exec.exec("viash", args, options);
  } catch (error) {
    core.setFailed(myError);
    return;
  }
    
  // pass output
  core.setOutput("output", myOutput);
}

run();