From 1e6569c9f4614b3d915653bab2fd423c99d814d6 Mon Sep 17 00:00:00 2001
From: Sebastian Holtermann <sebholt@xwmw.org>
Date: Thu, 7 Sep 2017 11:55:52 +0200
Subject: cmMakefile: Add GetOrCreateSourceGroup methods

---
 Source/cmMakefile.cxx | 21 +++++++++++++++++++++
 Source/cmMakefile.h   | 12 ++++++++++++
 2 files changed, 33 insertions(+)

diff --git a/Source/cmMakefile.cxx b/Source/cmMakefile.cxx
index 24c2de2..c9dc93c 100644
--- a/Source/cmMakefile.cxx
+++ b/Source/cmMakefile.cxx
@@ -2010,6 +2010,27 @@ void cmMakefile::AddSourceGroup(const std::vector<std::string>& name,
   sg->SetGroupRegex(regex);
 }
 
+cmSourceGroup* cmMakefile::GetOrCreateSourceGroup(
+  const std::vector<std::string>& folders)
+{
+  cmSourceGroup* sg = this->GetSourceGroup(folders);
+  if (sg == nullptr) {
+    this->AddSourceGroup(folders);
+    sg = this->GetSourceGroup(folders);
+  }
+  return sg;
+}
+
+cmSourceGroup* cmMakefile::GetOrCreateSourceGroup(const std::string& name)
+{
+  const char* delimiter = this->GetDefinition("SOURCE_GROUP_DELIMITER");
+  if (delimiter == nullptr) {
+    delimiter = "\\";
+  }
+  return this->GetOrCreateSourceGroup(
+    cmSystemTools::tokenize(name, delimiter));
+}
+
 /**
  * Find a source group whose regular expression matches the filename
  * part of the given source name.  Search backward through the list of
diff --git a/Source/cmMakefile.h b/Source/cmMakefile.h
index 31ae229..398604d 100644
--- a/Source/cmMakefile.h
+++ b/Source/cmMakefile.h
@@ -475,6 +475,18 @@ public:
                       const char* regex = nullptr);
 
   /**
+   * Get and existing or create a new source group.
+   */
+  cmSourceGroup* GetOrCreateSourceGroup(
+    const std::vector<std::string>& folders);
+
+  /**
+   * Get and existing or create a new source group.
+   * The name will be tokenized.
+   */
+  cmSourceGroup* GetOrCreateSourceGroup(const std::string& name);
+
+  /**
    * find what source group this source is in
    */
   cmSourceGroup* FindSourceGroup(const char* source,
-- 
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