When sketch has no functions, don't try generating prototypes. Fixes #1

Author: Federico Fissore

Diff for: src/arduino.cc/builder/prototypes_adder.go

@@ -40,13 +40,18 @@ type PrototypesAdder struct{}
 
 func (s *PrototypesAdder) Run(context map[string]interface{}) error {
 	source := context[constants.CTX_SOURCE].(string)
+	sourceRows := strings.Split(source, "\n")
 
 	if !utils.MapHas(context, constants.CTX_FIRST_FUNCTION_AT_LINE) {
 		return nil
 	}
 
 	firstFunctionLine := context[constants.CTX_FIRST_FUNCTION_AT_LINE].(int)
-	firstFunctionChar := len(strings.Join(strings.Split(source, "\n")[:firstFunctionLine-1], "\n")) + 1
+	if firstFunctionOutsideOfSource(firstFunctionLine, sourceRows) {
+		return nil
+	}
+
+	firstFunctionChar := len(strings.Join(sourceRows[:firstFunctionLine-1], "\n")) + 1
 	if firstFunctionLine > 1 {
 		firstFunctionLine -= context[constants.CTX_LINE_OFFSET].(int)
 	}
@@ -82,3 +87,7 @@ func composeIncludeArduinoSection() string {
 
 	return str
 }
+
+func firstFunctionOutsideOfSource(firstFunctionLine int, sourceRows []string) bool {
+	return firstFunctionLine > len(sourceRows)-1
+}

Diff for: src/arduino.cc/builder/test/builder_test.go

@@ -32,6 +32,7 @@ package test
 import (
 	"arduino.cc/builder"
 	"arduino.cc/builder/constants"
+	"github.com/stretchr/testify/require"
 	"os"
 	"path/filepath"
 	"testing"
@@ -243,3 +244,23 @@ func TestBuilderBridgeRedBearLab(t *testing.T) {
 	_, err = os.Stat(filepath.Join(buildPath, constants.FOLDER_LIBRARIES, "Bridge", "Mailbox.cpp.o"))
 	NoError(t, err)
 }
+
+func TestBuilderSketchNoFunctions(t *testing.T) {
+	DownloadCoresAndToolsAndLibraries(t)
+
+	context := make(map[string]interface{})
+
+	buildPath := SetupBuildPath(t, context)
+	defer os.RemoveAll(buildPath)
+
+	context[constants.CTX_HARDWARE_FOLDERS] = []string{filepath.Join("..", "hardware"), "hardware", "downloaded_hardware", "downloaded_board_manager_stuff"}
+	context[constants.CTX_TOOLS_FOLDERS] = []string{"downloaded_tools", "downloaded_board_manager_stuff"}
+	context[constants.CTX_FQBN] = "RedBearLab:avr:blend"
+	context[constants.CTX_SKETCH_LOCATION] = filepath.Join("sketch_no_functions", "main.ino")
+	context[constants.CTX_LIBRARIES_FOLDERS] = []string{"libraries", "downloaded_libraries"}
+	context[constants.CTX_BUILD_PROPERTIES_RUNTIME_IDE_VERSION] = "10600"
+
+	command := builder.Builder{}
+	err := command.Run(context)
+	require.Error(t, err)
+}

Diff for: src/arduino.cc/builder/test/prototypes_adder_test.go

@@ -435,3 +435,83 @@ func TestPrototypesAdderSketchWithConfig(t *testing.T) {
 
 	require.Equal(t, preprocessed, strings.Replace(context[constants.CTX_SOURCE].(string), "\r\n", "\n", -1))
 }
+
+func TestPrototypesAdderSketchNoFunctionsTwoFiles(t *testing.T) {
+	DownloadCoresAndToolsAndLibraries(t)
+
+	context := make(map[string]interface{})
+
+	buildPath := SetupBuildPath(t, context)
+	defer os.RemoveAll(buildPath)
+
+	context[constants.CTX_HARDWARE_FOLDERS] = []string{filepath.Join("..", "hardware"), "hardware", "downloaded_hardware"}
+	context[constants.CTX_TOOLS_FOLDERS] = []string{"downloaded_tools"}
+	context[constants.CTX_FQBN] = "arduino:avr:leonardo"
+	context[constants.CTX_SKETCH_LOCATION] = filepath.Join("sketch_no_functions_two_files", "main.ino")
+	context[constants.CTX_BUILD_PROPERTIES_RUNTIME_IDE_VERSION] = "10600"
+	context[constants.CTX_LIBRARIES_FOLDERS] = []string{"libraries", "downloaded_libraries"}
+	context[constants.CTX_VERBOSE] = true
+
+	commands := []types.Command{
+		&builder.SetupHumanLoggerIfMissing{},
+
+		&builder.ContainerSetupHardwareToolsLibsSketchAndProps{},
+
+		&builder.ContainerMergeCopySketchFiles{},
+
+		&builder.ContainerFindIncludes{},
+
+		&builder.PrintUsedLibrariesIfVerbose{},
+		&builder.WarnAboutArchIncompatibleLibraries{},
+
+		&builder.ContainerAddPrototypes{},
+	}
+
+	for _, command := range commands {
+		err := command.Run(context)
+		NoError(t, err)
+	}
+
+	require.Nil(t, context[constants.CTX_INCLUDE_SECTION])
+	require.Nil(t, context[constants.CTX_PROTOTYPE_SECTION])
+}
+
+func TestPrototypesAdderSketchNoFunctions(t *testing.T) {
+	DownloadCoresAndToolsAndLibraries(t)
+
+	context := make(map[string]interface{})
+
+	buildPath := SetupBuildPath(t, context)
+	defer os.RemoveAll(buildPath)
+
+	context[constants.CTX_HARDWARE_FOLDERS] = []string{filepath.Join("..", "hardware"), "hardware", "downloaded_hardware"}
+	context[constants.CTX_TOOLS_FOLDERS] = []string{"downloaded_tools"}
+	context[constants.CTX_FQBN] = "arduino:avr:leonardo"
+	context[constants.CTX_SKETCH_LOCATION] = filepath.Join("sketch_no_functions", "main.ino")
+	context[constants.CTX_BUILD_PROPERTIES_RUNTIME_IDE_VERSION] = "10600"
+	context[constants.CTX_LIBRARIES_FOLDERS] = []string{"libraries", "downloaded_libraries"}
+	context[constants.CTX_VERBOSE] = true
+
+	commands := []types.Command{
+		&builder.SetupHumanLoggerIfMissing{},
+
+		&builder.ContainerSetupHardwareToolsLibsSketchAndProps{},
+
+		&builder.ContainerMergeCopySketchFiles{},
+
+		&builder.ContainerFindIncludes{},
+
+		&builder.PrintUsedLibrariesIfVerbose{},
+		&builder.WarnAboutArchIncompatibleLibraries{},
+
+		&builder.ContainerAddPrototypes{},
+	}
+
+	for _, command := range commands {
+		err := command.Run(context)
+		NoError(t, err)
+	}
+
+	require.Nil(t, context[constants.CTX_INCLUDE_SECTION])
+	require.Nil(t, context[constants.CTX_PROTOTYPE_SECTION])
+}

Diff for: src/arduino.cc/builder/test/sketch_no_functions/main.ino

@@ -0,0 +1,8 @@
+/*
+
+Test sketch
+
+
+
+*/
+

Diff for: src/arduino.cc/builder/test/sketch_no_functions_two_files/main.ino

@@ -0,0 +1,8 @@
+/*
+
+Test sketch
+
+
+
+*/
+

Diff for: src/arduino.cc/builder/test/sketch_no_functions_two_files/partb.ino

@@ -0,0 +1,4 @@
+#include <SPI.h>
+
+int a = 0;
+int b = 0;