Add min_subject_width to TextWidth

Author: namuit

config/default.yml

@@ -108,6 +108,7 @@ CommitMsg:
     enabled: true
     description: 'Check text width'
     max_subject_width: 60
+    min_subject_width: 0
     max_body_width: 72
 
   TrailingPeriod:

lib/overcommit/hook/commit_msg/text_width.rb

@@ -21,9 +21,11 @@ def find_errors_in_subject(subject)
       max_subject_width =
         config['max_subject_width'] +
         special_prefix_length(subject)
-      return unless subject.length > max_subject_width
+      min_subject_width = config['min_subject_width']
+      return unless subject.length > max_subject_width || subject.length < min_subject_width
 
-      @errors << "Please keep the subject <= #{max_subject_width} characters"
+      @errors << "Please keep the subject <= #{max_subject_width} and >= " \
+                 "#{min_subject_width} characters"
     end
 
     def find_errors_in_body(lines)

spec/overcommit/hook/commit_msg/text_width_spec.rb

@@ -99,6 +99,7 @@
         'CommitMsg' => {
           'TextWidth' => {
             'max_subject_width' => 70,
+            'min_subject_width' => 4,
             'max_body_width' => 80
           }
         }
@@ -111,6 +112,12 @@
       it { should warn /subject/ }
     end
 
+    context 'when subject is less than 4 characters' do
+      let(:commit_msg) { 'A' * 3 }
+
+      it { should warn /subject/ }
+    end
+
     context 'when subject is 70 characters or fewer' do
       let(:commit_msg) { 'A' * 70 }