rules: check spaces in commit title

lib/rules/title-format.js

@@ -22,6 +22,36 @@ module.exports = {
       pass = false
     }
 
+    {
+      const result = /^(.+?:)[^ ]/.exec(context.title)
+      if (result) {
+        context.report({
+          id: id
+        , message: 'Add a space after subsystem(s).'
+        , string: context.title
+        , line: 0
+        , column: result[1].length
+        , level: 'fail'
+        })
+        pass = false
+      }
+    }
+
+    {
+      const result = /\s\s/.exec(context.title)
+      if (result) {
+        context.report({
+          id: id
+        , message: 'Do not use consecutive spaces in title.'
+        , string: context.title
+        , line: 0
+        , column: result.index + 1
+        , level: 'fail'
+        })
+        pass = false
+      }
+    }
+
     const result = /^(.+?): [A-Z]/.exec(context.title)
     if (result) {
       context.report({

test/rules/title-format.js

@@ -0,0 +1,63 @@
+'use strict'
+
+const test = require('tap').test
+const Rule = require('../../lib/rules/title-format')
+const Commit = require('gitlint-parser-node')
+const Validator = require('../../')
+
+function makeCommit(title) {
+  const v = new Validator()
+  return new Commit({
+    sha: 'e7c077c610afa371430180fbd447bfef60ebc5ea'
+  , author: {
+      name: 'Evan Lucas'
+    , email: '[email protected]'
+    , date: '2016-04-12T19:42:23Z'
+    }
+  , message: title
+  }, v)
+}
+
+test('rule: title-format', (t) => {
+  t.test('space after subsystem', (tt) => {
+    tt.plan(2)
+    const context = makeCommit('test:missing space')
+
+    context.report = (opts) => {
+      tt.pass('called report')
+      tt.strictSame(opts, {
+        id: 'title-format'
+      , message: 'Add a space after subsystem(s).'
+      , string: 'test:missing space'
+      , line: 0
+      , column: 5
+      , level: 'fail'
+      })
+    }
+
+    Rule.validate(context)
+    tt.end()
+  })
+
+  t.test('consecutive spaces', (tt) => {
+    tt.plan(2)
+    const context = makeCommit('test: with  two spaces')
+
+    context.report = (opts) => {
+      tt.pass('called report')
+      tt.strictSame(opts, {
+        id: 'title-format'
+      , message: 'Do not use consecutive spaces in title.'
+      , string: 'test: with  two spaces'
+      , line: 0
+      , column: 11
+      , level: 'fail'
+      })
+    }
+
+    Rule.validate(context)
+    tt.end()
+  })
+
+  t.end()
+})