setup-haskell/src/installer.ts

import * as core from '@actions/core';
import * as fs from 'fs';
import * as path from 'path';

export function findHaskellGHCVersion(baseInstallDir: string, version: string) {
  return _findHaskellToolVersion(baseInstallDir, 'ghc', version);
}

export function findHaskellCabalVersion(
  baseInstallDir: string,
  version: string
) {
  return _findHaskellToolVersion(baseInstallDir, 'cabal', version);
}

export function _findHaskellToolVersion(
  baseInstallDir: string,
  tool: string,
  version: string
) {
  if (!baseInstallDir) {
    throw new Error('baseInstallDir parameter is required');
  }
  if (!tool) {
    throw new Error('toolName parameter is required');
  }
  if (!version) {
    throw new Error('versionSpec parameter is required');
  }

  const toolPath: string = path.join(baseInstallDir, tool, version, 'bin');
  throw new Error(`Looking in ${toolPath}`);
  // if (fs.existsSync(toolPath)) {
  //   core.debug(`Found tool in cache ${tool} ${version}`);
  //   core.addPath(toolPath);
  // } else {
  //   throw new Error(`Version ${version} of ${tool} not found`);
  // }
}