Improve error logging (#55)

Improves error logging when the `sfdx` command is executed.
Updates README with better instructions for all input parameters.

README.md

@@ -6,6 +6,9 @@ Runs sfdx-scanner on a pull request or individual commit and generates in-line c
 
 ## Inputs
 
+| NOTE: All inputs are optional |
+| ----------------------------- |
+
 ## `category`
 
 Categor(ies) of rules to run.
@@ -24,7 +27,34 @@ Location of eslintrc config to customize eslint engine.
 
 ## `pmdconfig`
 
-Location of PMD rule reference XML file to customize rule selection
+Location of PMD rule reference XML file to customize rule selection.
+
+### Multiple PMD Rulesets
+
+To use multiple rulesets within the scan, make a top level file such as `masterRuleset.xml` and include the paths to the other ruleset files:
+
+```
+.
+├── masterRuleset.xml
+├── ruleset1.xml
+└── ruleset2.xml
+```
+
+```xml
+<?xml version="1.0" encoding="UTF-8"?>
+<ruleset name="master"
+    xmlns="http://pmd.sourceforge.net/ruleset/2.0.0"
+    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+    xsi:schemaLocation="http://pmd.sourceforge.net/ruleset/2.0.0 https://pmd.sourceforge.io/ruleset_2_0_0.xsd">
+    <description>Master Ruleset</description>
+    <rule ref="ruleset1.xml" />
+    <rule ref="ruleset2.xml" />
+</ruleset>
+```
+
+```yml
+pmdconfig: masterRuleset.xml
+```
 
 ## `severity-threshold`
 
@@ -40,17 +70,18 @@ Optionally provide this to scan a whole directory instead of just the diff. If t
 
 ## `tsconfig`
 
-Location of tsconfig.json file
+Location of tsconfig.json file.
 
 ## `report-mode`
 
 Details which way to report issues back to GitHub, can be either:
+
 - `check-runs` - Shows findings as annotations on the PR (default)
 - `comments` - Shows findings as comments
 
 ## `delete-resolved-comments`
 
-When set to true, will delete resolved comments from a PR. Defaults to `false`. Will do nothing unless `report-mode` is set to `comments`
+When set to true, will delete resolved comments from a PR. Defaults to `false`. Will do nothing unless `report-mode` is set to `comments`.
 
 ## Example usage
 
@@ -74,9 +105,9 @@ jobs:
           sfdx plugins:install @salesforce/sfdx-scanner
 
       - name: Run SFDX Scanner - Report findings as comments
-        uses: mitchspano/sfdx-scan-pull-request@v0.1.8
+        uses: mitchspano/sfdx-scan-pull-request@v0.1.12
         with:
-          pmdconfig: ruleset.xml
+          pmdconfig: masterRuleset.xml
           severity-threshold: 4
           strictly-enforced-rules: '[{ "engine": "pmd", "category": "Performance", "rule": "AvoidDebugStatements" }]'
         env:

src/index.ts

@@ -27,6 +27,13 @@ import { CommentsReporter } from "./reporter/comments-reporter";
 import { AnnotationsReporter } from "./reporter/annoations-reporter";
 import { Reporter } from "./reporter/reporter.types";
 
+interface ExecSyncError {
+  status: string;
+  stack: string;
+  output: Buffer;
+  message: string;
+}
+
 /**
  * @description Collects and verifies the inputs from the action context and metadata
  * https://docs.github.com/en/actions/creating-actions/metadata-syntax-for-github-actions#inputs
@@ -91,9 +98,20 @@ export async function performStaticCodeAnalysisOnFilesInDiff(
   console.log(
     "Performing static code analysis on all of the files in the difference..."
   );
-
-  const findings = await scanFiles(scannerFlags);
-  return typeof findings === "string" ? [] : findings;
+  try {
+    const findings = await scanFiles(scannerFlags);
+    return typeof findings === "string" ? [] : findings;
+  } catch (err) {
+    const typedErr = err as unknown as ExecSyncError;
+    console.error({
+      message: typedErr.message,
+      status: typedErr.status,
+      stack: typedErr.stack,
+      output: typedErr.output.toString(),
+    });
+    setFailed("Something went wrong when scanning the files.");
+  }
+  return [];
 }
 
 /**

src/sfdxCli.ts

@@ -52,7 +52,6 @@ const cli = async <T>(commandName: string, cliArgs: string[] = []) => {
   let result = null as T;
   try {
     const cliCommand = `npx sfdx ${commandName} ${cliArgs.join(" ")}`;
-    console.log("Running scan...");
     console.log(cliCommand);
     result = (
       JSON.parse(execSync(cliCommand).toString()) as SfdxCommandResult<T>