Add camel_case convention to NameFormat

CHANGELOG.md

@@ -6,7 +6,7 @@
   this is a particular dialect which may not be what developers expect
 * Allow `SelectorFormat` convention explanations to be customized via the
   `#{type}_convention_explanation` and `convention_explanation` options
-* Add `snake_case` convention to `NameFormat`
+* Add `camel_case` and `snake_case` conventions to `NameFormat`
 * Remove `BEM` convention from `NameFormat`, as it didn't make sense in this
   context since `NameFormat` does not deal with selectors
 

config/default.yml

@@ -84,7 +84,7 @@ linters:
   NameFormat:
     enabled: true
     allow_leading_underscore: true
-    convention: hyphenated_lowercase # or 'BEM', or a regex pattern
+    convention: hyphenated_lowercase # or 'camel_case', or 'snake_case', or a regex pattern
 
   NestingDepth:
     enabled: true

lib/scss_lint/linter/README.md

@@ -609,8 +609,8 @@ Configuration Option | Description
 
 ## NameFormat
 
-Functions, mixins, and variables should be declared with all lowercase letters
-and hyphens instead of underscores.
+Functions, mixins, variables, and placeholders should be declared with all
+lowercase letters and hyphens instead of underscores.
 
 **Bad: uppercase characters**
 ```scss
@@ -654,7 +654,7 @@ You can also prefer the [BEM](http://bem.info/method/) convention by setting the
 Configuration Option       | Description
 ---------------------------|---------------------------------------------------
 `allow_leading_underscore` | Whether to allow names to start with a single underscore (default `true`)
-`convention`               | Name of convention to use (`hyphenated_lowercase` (default), `snake_case`, or `BEM`), or a regex the name must match (eg: `^[a-zA-Z]+$`)
+`convention`               | Name of convention to use (`hyphenated_lowercase` (default), `camel_case`, `snake_case`), or a regex the name must match (eg: `^[a-zA-Z]+$`)
 
 ## NestingDepth
 

lib/scss_lint/linter/name_format.rb

@@ -1,6 +1,6 @@
 module SCSSLint
-  # Checks that the declared names of functions, mixins, and variables are all
-  # lowercase and use hyphens instead of underscores.
+  # Checks the format of declared names of functions, mixins, variables, and
+  # placeholders.
   class Linter::NameFormat < Linter
     include LinterRegistry
 
@@ -70,6 +70,10 @@ def check_placeholder(node)
     end
 
     CONVENTIONS = {
+      'camel_case' => {
+        explanation: 'should be written in camelCase format',
+        validator: ->(name) { name =~ /^[a-z][a-zA-Z0-9]*$/ },
+      },
       'snake_case' => {
         explanation: 'should be written in snake_case',
         validator: ->(name) { name !~ /[^_a-z0-9]/ },

spec/scss_lint/linter/name_format_spec.rb

@@ -194,6 +194,34 @@
     end
   end
 
+  context 'when the camel_case convention is specified' do
+    let(:linter_config) { { 'convention' => 'camel_case' } }
+
+    context 'when a name contains all lowercase letters' do
+      let(:scss) { '$variable: 1;' }
+
+      it { should_not report_lint }
+    end
+
+    context 'when a name contains all lowercase letters and underscores' do
+      let(:scss) { '$my_variable: 1;' }
+
+      it { should report_lint }
+    end
+
+    context 'when a name contains all lowercase letters and hyphens' do
+      let(:scss) { '$my-variable: 1;' }
+
+      it { should report_lint }
+    end
+
+    context 'when a name is written in camelCase' do
+      let(:scss) { '$myVariable: 1;' }
+
+      it { should_not report_lint }
+    end
+  end
+
   context 'when the snake_case convention is specified' do
     let(:linter_config) { { 'convention' => 'snake_case' } }