Print a more friendly error message

Follow-up for #116.

Category: fix
Closes: #120

README.md

@@ -124,6 +124,7 @@ Options:
 - `--report <reporter>`: see [Reporters](#reporters)
 - `--[no-]color`: force color in report (detected by default)
 - `--fix`: backwards-compatible alias for fix command
+- `--verbose`: enable verbose output
 
 ### Commands
 

USAGE

@@ -27,6 +27,7 @@ Options:
       --no-commits         Don't populate release with commits
       --gte <version>      Only include versions greater than or equal to this
       --lte <version>      Only include versions less than or equal to this
+      --verbose            Enable verbose output
 
 Examples:
   # Lint *.md files

cli.js

@@ -11,7 +11,7 @@ if (process.version.match(/^v(\d+)\./)[1] < 16) {
 }
 
 const argv = subarg(process.argv.slice(2), {
-  boolean: ['fix', 'help', 'version', 'commits'],
+  boolean: ['fix', 'help', 'version', 'commits', 'verbose'],
   string: ['report'],
   default: {
     fix: false,
@@ -68,7 +68,14 @@ function files (rest) {
 }
 
 function done (err, result) {
-  if (err) throw err
+  if (err) {
+    // Due to bundling the CLI into 1 file the error can be noisy (#120) so
+    // print a more friendly (shorter) message by default.
+    if (argv.verbose) throw err
+    console.error('%s: %s', err.name, err.message || err)
+    process.exit(1)
+  }
+
   process.exit(result.code)
 }