Add global quiet option for silencing hook runs

Developers should have the ability to completely silence hook runs
except in the case of warning or failure, if they so chose.

Closes #357

CHANGELOG.md

@@ -10,6 +10,8 @@
   for most use cases, but parallelized hook runs may be problematic. If someone
   from the community is willing to step up to support it, we'll gladly add it
   back.
+* Add global `quiet` option which silences all hook output except in the case
+  of warning or error
 
 ## 0.32.0
 

config/default.yml

@@ -39,6 +39,10 @@ gemfile: false
 # to the root of the repository.
 plugin_directory: '.git-hooks'
 
+# Whether to hide hook output by default. This results in completely silent hook
+# runs except in the case of warning or failure.
+quiet: false
+
 # Number of hooks that can be run concurrently. Typically this won't need to be
 # adjusted, but if you know that some of your hooks themselves use multiple
 # processors you can lower this value accordingly. You can define

lib/overcommit/cli.rb

@@ -197,7 +197,7 @@ def run_all
       context = Overcommit::HookContext.create('run-all', config, @arguments, empty_stdin)
       config.apply_environment!(context, ENV)
 
-      printer = Overcommit::Printer.new(log, context)
+      printer = Overcommit::Printer.new(config, log, context)
       runner  = Overcommit::HookRunner.new(config, log, context, printer)
 
       status = runner.run

lib/overcommit/printer.rb

@@ -8,7 +8,8 @@ module Overcommit
   class Printer
     attr_reader :log
 
-    def initialize(logger, context)
+    def initialize(config, logger, context)
+      @config = config
       @log = logger
       @context = context
       @lock = Monitor.new # Need to use monitor so we can have re-entrant locks
@@ -17,7 +18,7 @@ def initialize(logger, context)
 
     # Executed at the very beginning of running the collection of hooks.
     def start_run
-      log.bold "Running #{hook_script_name} hooks"
+      log.bold "Running #{hook_script_name} hooks" unless @config['quiet']
     end
 
     def nothing_to_run
@@ -36,7 +37,7 @@ def required_hook_not_skipped(hook)
     def end_hook(hook, status, output)
       # Want to print the header for quiet hooks only if the result wasn't good
       # so that the user knows what failed
-      print_header(hook) if !hook.quiet? || status != :pass
+      print_header(hook) if (!hook.quiet? && !@config['quiet']) || status != :pass
 
       print_result(hook, status, output)
     end
@@ -69,9 +70,11 @@ def run_warned
 
     # Executed when no hooks failed by the end of the run.
     def run_succeeded
-      log.newline
-      log.success "✓ All #{hook_script_name} hooks passed"
-      log.newline
+      unless @config['quiet']
+        log.newline
+        log.success "✓ All #{hook_script_name} hooks passed"
+        log.newline
+      end
     end
 
     private
@@ -83,10 +86,10 @@ def print_header(hook)
       log.partial hook_name
     end
 
-    def print_result(hook, status, output)
+    def print_result(hook, status, output) # rubocop:disable Metrics/CyclomaticComplexity
       case status
       when :pass
-        log.success 'OK' unless hook.quiet?
+        log.success 'OK' unless @config['quiet'] || hook.quiet?
       when :warn
         log.warning 'WARNING'
         print_report(output, :bold_warning)

template-dir/hooks/overcommit-hook

@@ -73,7 +73,7 @@ begin
   context = Overcommit::HookContext.create(hook_type, config, ARGV, STDIN)
   config.apply_environment!(context, ENV)
 
-  printer = Overcommit::Printer.new(logger, context)
+  printer = Overcommit::Printer.new(config, logger, context)
   runner = Overcommit::HookRunner.new(config, logger, context, printer)
 
   status = runner.run