feat: set exit code depending on what went wrong

.eslintrc.yaml

@@ -21,3 +21,5 @@ rules:
     - error
     - always
   no-console: warn
+ignorePatterns:
+  - test/projects/broken/*.js

bin/cli.js

@@ -17,14 +17,27 @@ const GUI = new gui();
 
 const logger = Logger("");
 
+const EXIT_CODES = Object.freeze({
+    success: 0,
+    violations: 1,
+    unexpected: 2,
+    interrupted: 3,
+    configuration: 4,
+});
+
 // used by meow's loud reject
 // eslint-disable-next-line no-console
 console.error = logger.error.bind(logger);
 
 // Pretty logs all errors, then exits
 process.on("uncaughtException", err => {
     logger.error(err);
-    process.exit(1);
+    process.exit(EXIT_CODES.unexpected);
+});
+
+// Handle SIGINT
+process.on("SIGINT", () => {
+    process.exit(EXIT_CODES.interrupted);
 });
 
 // Generates the CLI binding using meow
@@ -69,12 +82,12 @@ process.on("exit", () => {
             logger.debug("No configuration file found");
             if (cli.flags.config) {
                 logger.error("Configuration file not found");
-                process.exit(1);
+                process.exit(EXIT_CODES.configuration);
             }
         }
     } catch (e) {
         logger.error(`Failed to parse config: ${e.stack}`);
-        process.exit(1);
+        process.exit(EXIT_CODES.configuration);
     }
 
     // lint all the files
@@ -85,7 +98,9 @@ process.on("exit", () => {
         --activeLintings;
         logger.debug("Linting done,", activeLintings, "to go");
         if (activeLintings <= 0) {
-            process.exit(hasErrors ? 1 : 0);
+            process.exit(
+                hasErrors ? EXIT_CODES.violations : EXIT_CODES.success
+            );
         }
     };
     files.forEach(filePath => {

test/cli.spec.js

@@ -54,12 +54,20 @@ describe("CLI", function(){
 });
 
 describe("Configuration files", function() {
-    it("should fail passing an non-existent file path to --config", async function() {
+    it("should fail with an non-existent configuration file", async function(){
         const { failed, exitCode } = await execCliWith(
-            [VALID_SVG, "--config", "./this/file/does/not-exist.js"],
+            ["--config", "./this/file/does/not-exist.js"]
         );
         expect(failed).toBeTruthy();
-        expect(exitCode).toBe(1);
+        expect(exitCode).toBe(4);
+    });
+
+    it("should fail with a broken configuration file", async function(){
+        const { failed, exitCode } = await execCliWith(
+            ["--config", "./test/projects/broken/broken-svglint-config.js"]
+        );
+        expect(failed).toBeTruthy();
+        expect(exitCode).toBe(4);
     });
 
     it("should succeed passing an existent file path to --config", async function() {

test/projects/broken/broken-svglint-config.js

@@ -0,0 +1 @@
+garble garble I'm invalid