adding a command line argument to print hook output as json

README.md

@@ -336,6 +336,7 @@ optional arguments:
   -h, --help            show this help message and exit
   -v, --verbose         Verbose mode.
   --version             Display version information.
+  --json                Print detect-secrets-hook output as JSON
   --baseline FILENAME   Explicitly ignore secrets through a baseline generated
                         by `detect-secrets scan`
 

detect_secrets/core/usage/__init__.py

@@ -59,7 +59,6 @@ def add_default_options(self) -> 'ParserBuilder':
                 'using the max cores on the current host.'
             ),
         )
-
         return self
 
     def add_console_use_arguments(self) -> 'ParserBuilder':
@@ -92,7 +91,11 @@ def add_pre_commit_arguments(self) -> 'ParserBuilder':
             nargs='*',
             help='Filenames to check.',
         )
-
+        self._parser.add_argument(
+            '--json',
+            action='store_true',
+            help='Print detect-secrets-hook output as JSON',
+        )
         self.add_baseline_options(
             help=(
                 'Explicitly ignore secrets through a baseline generated by `detect-secrets scan`'

detect_secrets/pre_commit_hook.py

@@ -34,7 +34,10 @@ def main(argv: Optional[List[str]] = None) -> int:
         new_secrets = secrets - args.baseline
 
     if new_secrets:
-        pretty_print_diagnostics(new_secrets)
+        if args.json:
+            print(json.dumps(baseline.format_for_output(new_secrets), indent=2))
+        else:
+            pretty_print_diagnostics(new_secrets)
         return 1
 
     if not args.baseline: