added MergeSketchSources + tests

Author: masci

Diff for: arduino/builder/sketch.go

@@ -19,6 +19,7 @@ import (
 	"io/ioutil"
 	"os"
 	"path/filepath"
+	"regexp"
 	"strings"
 
 	"github.com/arduino/arduino-cli/arduino/globals"
@@ -27,6 +28,17 @@ import (
 	"github.com/pkg/errors"
 )
 
+var includesArduinoH = regexp.MustCompile(`^\s*#\s*include\s*[<\"]Arduino\.h[>\"]`)
+
+// QuoteCppString returns the given string as a quoted string for use with the C
+// preprocessor. This adds double quotes around it and escapes any
+// double quotes and backslashes in the string.
+func QuoteCppString(str string) string {
+	str = strings.Replace(str, "\\", "\\\\", -1)
+	str = strings.Replace(str, "\"", "\\\"", -1)
+	return "\"" + str + "\""
+}
+
 // SaveSketchItemCpp saves a preprocessed .cpp sketch file on disk
 func SaveSketchItemCpp(item *sketch.Item, buildPath string) error {
 
@@ -120,3 +132,26 @@ func LoadSketch(sketchPath, buildPath string) (*sketch.Sketch, error) {
 
 	return sketch.New(sketchFolder, mainSketchFile, buildPath, files)
 }
+
+// MergeSketchSources merges all the source files included in a sketch
+func MergeSketchSources(sketch *sketch.Sketch) (int, string) {
+	lineOffset := 0
+	mergedSource := ""
+
+	// add Arduino.h inclusion directive if missing
+	if !includesArduinoH.MatchString(sketch.MainFile.GetSourceStr()) {
+		mergedSource += "#include <Arduino.h>\n"
+		lineOffset++
+	}
+
+	mergedSource += "#line 1 " + QuoteCppString(sketch.MainFile.Path) + "\n"
+	mergedSource += sketch.MainFile.GetSourceStr() + "\n"
+	lineOffset++
+
+	for _, item := range sketch.OtherSketchFiles {
+		mergedSource += "#line 1 " + QuoteCppString(item.Path) + "\n"
+		mergedSource += item.GetSourceStr() + "\n"
+	}
+
+	return lineOffset, mergedSource
+}

Diff for: arduino/builder/sketch_test.go

@@ -89,3 +89,21 @@ func TestLoadSketchFolderWrongMain(t *testing.T) {
 	assert.Error(t, err)
 	assert.Contains(t, err.Error(), "no such file or directory")
 }
+
+func TestMergeSketchSources(t *testing.T) {
+	// borrow the sketch from TestLoadSketchFolder to avoid boilerplate
+	s, err := builder.LoadSketch(filepath.Join("testdata", "TestLoadSketchFolder"), "")
+	assert.Nil(t, err)
+	assert.NotNil(t, s)
+
+	// load expected result
+	mergedPath := filepath.Join("testdata", t.Name()+".txt")
+	mergedBytes, err := ioutil.ReadFile(mergedPath)
+	if err != nil {
+		t.Fatalf("unable to read golden file %s: %v", mergedPath, err)
+	}
+
+	offset, source := builder.MergeSketchSources(s)
+	assert.Equal(t, 2, offset)
+	assert.Equal(t, string(mergedBytes), source)
+}

Diff for: arduino/builder/testdata/TestLoadSketchFolder/merged_sketch.txt

@@ -0,0 +1,15 @@
+#include <Arduino.h>
+#line 1 "testdata/TestLoadSketchFolder/TestLoadSketchFolder.ino"
+void setup() {
+
+}
+
+void loop() {
+
+}
+#line 1 "testdata/TestLoadSketchFolder/old.pde"
+
+#line 1 "testdata/TestLoadSketchFolder/other.ino"
+String hello() {
+  return "world";
+}