Add syntax highlight to function calls

spec/syntax/function_spec.rb

@@ -5,7 +5,7 @@
 
 describe 'function syntax' do
   it 'doesnt treat underscored functions like unsued variables' do
-    expect(<<~EOF).to include_elixir_syntax('elixirId', '__ensure_defimpl__')
+    expect(<<~EOF).to include_elixir_syntax('elixirFunctionCall', '__ensure_defimpl__')
       defp derive(protocol, for, struct, opts, env) do
         # ... code ...
         __ensure_defimpl__(protocol, for, env)
@@ -17,4 +17,102 @@
         __ensure_defimpl__(protocol, for, env)
     EOF
   end
+
+  it 'detects higher order function calls' do
+    expect(<<~'EOF').to include_elixir_syntax('elixirFunctionCall', 'func')
+      func.()
+    EOF
+  end
+
+  it 'detects function calls with parenthesis' do
+    expect(<<~'EOF').to include_elixir_syntax('elixirFunctionCall', 'func')
+      func()
+    EOF
+  end
+
+  it 'detects function calls with bangs' do
+    expect(<<~'EOF').to include_elixir_syntax('elixirFunctionCall', 'func!')
+      func!()
+    EOF
+  end
+
+  it 'detects function calls with question marks' do
+    expect(<<~'EOF').to include_elixir_syntax('elixirFunctionCall', 'func?')
+      func?()
+    EOF
+  end
+
+  it 'detects function calls appended by module with parenthesis' do
+    expect(<<~'EOF').to include_elixir_syntax('elixirFunctionCall', 'func')
+      Mod.func()
+    EOF
+  end
+
+  it 'detects function calls appended by atom with parenthesis' do
+    expect(<<~'EOF').to include_elixir_syntax('elixirFunctionCall', 'func')
+      :mod.func()
+    EOF
+  end
+
+  it 'detects function calls appended by module without parenthesis' do
+    expect(<<~'EOF').to include_elixir_syntax('elixirFunctionCall', 'func')
+      Mod.func
+    EOF
+  end
+
+  it 'detects function calls appended by atom without parenthesis' do
+    expect(<<~'EOF').to include_elixir_syntax('elixirFunctionCall', 'func')
+      :mod.func
+    EOF
+  end
+
+  it 'detects function calls without parenthesis that contain paramenters' do
+    expect(<<~'EOF').to include_elixir_syntax('elixirFunctionCall', 'func')
+      func 1
+    EOF
+    expect(<<~'EOF').to include_elixir_syntax('elixirFunctionCall', 'func')
+      func [1]
+    EOF
+    expect(<<~'EOF').to include_elixir_syntax('elixirFunctionCall', 'func')
+      func :atom
+    EOF
+    expect(<<~'EOF').to include_elixir_syntax('elixirFunctionCall', 'func')
+      func "string"
+    EOF
+    expect(<<~'EOF').to include_elixir_syntax('elixirFunctionCall', 'func')
+      func 'a'
+    EOF
+  end
+
+  it 'does not highlight function calls without parenthesis that does not contain paramenters' do
+    expect(<<~'EOF').not_to include_elixir_syntax('elixirFunctionCall', 'func')
+      func
+    EOF
+  end
+
+  it 'does not detect calls to function with invalid names' do
+    expect(<<~'EOF').not_to include_elixir_syntax('elixirFunctionCall', '2fast2func')
+      2fast2func()
+    EOF
+  end
+
+  it 'ignores spacing between module and function names' do
+    expect(<<~'EOF').to include_elixir_syntax('elixirFunctionCall', 'func')
+      Module .           func
+    EOF
+  end
+
+  it 'detects piped functions with parenthesis' do
+    expect(<<~'EOF').to include_elixir_syntax('elixirFunctionCall', 'func')
+      one_func()
+      |> func()
+    EOF
+  end
+
+  it 'detects piped functions without parenthesis' do
+    expect(<<~'EOF').to include_elixir_syntax('elixirFunctionCall', 'func')
+      one_func()
+      |> func
+    EOF
+  end
 end

syntax/elixir.vim

@@ -50,6 +50,10 @@ syn keyword elixirBoolean true false nil
 syn match elixirVariable '@[a-z]\w*'
 syn match elixirVariable '&\d\+'
 
+syn match elixirFunctionCall '\<[a-z_]\w*[!?]\?\(\s*\.\?\s*(\|\s\+[a-zA-Z0-9@:\'\"\[]\)\@='
+syn match elixirFunctionCall '\(:\w\+\s*\.\s*\|[A-Z]\w*\s*\.\s*\)\@<=[a-z_]\w*[!?]\?'
+syn match elixirFunctionCall '\(>\s+\)\<[a-z_]\w*[!?]\?'
+
 syn keyword elixirPseudoVariable __FILE__ __DIR__ __MODULE__ __ENV__ __CALLER__
 
 syn match elixirNumber '\<-\?\d\(_\?\d\)*\(\.[^[:space:][:digit:]]\@!\(_\?\d\)*\)\?\([eE][-+]\?\d\(_\?\d\)*\)\?\>'
@@ -197,6 +201,7 @@ hi def link elixirStructDefine               Define
 hi def link elixirExUnitMacro                Define
 hi def link elixirModuleDeclaration          Type
 hi def link elixirPrivateFunctionDeclaration elixirFunctionDeclaration
+hi def link elixirFunctionCall               Function
 hi def link elixirFunctionDeclaration        Function
 hi def link elixirPrivateMacroDeclaration    elixirMacroDeclaration
 hi def link elixirMacroDeclaration           Macro