Improve error handling in installPowerPoint function

[jozefizso]

Problem

The installPowerPoint() function only captures the exit code when installation fails, making it difficult to debug issues.

Current code (src/index.js:82-84):

const exitCode = await exec.exec('sudo', ['installer', '-pkg', installerPath, '-target', '/Applications']);
if (exitCode !== 0) {
  throw new Error(`Microsoft PowerPoint installation failed with code ${exitCode}.`);
}

When installation fails, users only see:

Error: Microsoft PowerPoint installation failed with code 1.

This provides no information about why the installation failed.

Solution

Capture stdout and stderr to provide better error context:

const { exitCode, stdout, stderr } = await exec.getExecOutput(
  'sudo',
  ['installer', '-pkg', installerPath, '-target', '/'],
  { ignoreReturnCode: true }
);

if (exitCode !== 0) {
  const errorOutput = stderr || stdout || '(no output)';
  throw new Error(
    `Microsoft PowerPoint installation failed with code ${exitCode}.\n${errorOutput.trim()}`
  );
}

Benefits

• Users get actionable error messages
• Easier to diagnose installation failures
• Consistent with error handling used in enableUiAutomation() (src/index.js:110-118)

Priority

Should be fixed before v1.0.0 to improve user experience when troubleshooting issues.

Additional Considerations

Consider adding similar improvements to other exec calls:

• readPlistValue() at src/index.js:226
• Any other exec calls that don't capture output