cmake -E: Add cmake_transform_depfile internal command

1 files changed, 114 insertions, 0 deletions

diff --git a/Source/cmTransformDepfile.cxx b/Source/cmTransformDepfile.cxx
new file mode 100644
index 0000000..e1f8753
--- /dev/null
+++ b/Source/cmTransformDepfile.cxx
@@ -0,0 +1,114 @@
+/* Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
+   file Copyright.txt or https://cmake.org/licensing for details.  */
+#include "cmTransformDepfile.h"
+
+#include <string>
+#include <type_traits>
+#include <utility>
+#include <vector>
+
+#include <cm/optional>
+
+#include "cmsys/FStream.hxx"
+
+#include "cmGccDepfileReader.h"
+#include "cmGccDepfileReaderTypes.h"
+#include "cmStringAlgorithms.h"
+#include "cmSystemTools.h"
+
+namespace {
+void WriteFilenameGcc(cmsys::ofstream& fout, const std::string& filename)
+{
+  for (auto c : filename) {
+    switch (c) {
+      case ' ':
+        fout << "\\ ";
+        break;
+      case '\\':
+        fout << "\\\\";
+        break;
+      default:
+        fout << c;
+        break;
+    }
+  }
+}
+
+void WriteGccDepfile(cmsys::ofstream& fout, const cmGccDepfileContent& content)
+{
+  for (auto const& dep : content) {
+    bool first = true;
+    for (auto const& rule : dep.rules) {
+      if (!first) {
+        fout << " \\\n  ";
+      }
+      first = false;
+      WriteFilenameGcc(fout, rule);
+    }
+    fout << ':';
+    for (auto const& path : dep.paths) {
+      fout << " \\\n  " << path;
+    }
+    fout << '\n';
+  }
+}
+
+void WriteVsTlog(cmsys::ofstream& fout, const cmGccDepfileContent& content)
+{
+  for (auto const& dep : content) {
+    fout << '^';
+    bool first = true;
+    for (auto const& rule : dep.rules) {
+      if (!first) {
+        fout << '|';
+      }
+      first = false;
+      fout << cmSystemTools::ConvertToOutputPath(rule);
+    }
+    fout << "\r\n";
+    for (auto const& path : dep.paths) {
+      fout << cmSystemTools::ConvertToOutputPath(path) << "\r\n";
+    }
+  }
+}
+}
+
+bool cmTransformDepfile(cmDepfileFormat format, const std::string& prefix,
+                        const std::string& infile, const std::string& outfile)
+{
+  cmGccDepfileContent content;
+  if (cmSystemTools::FileExists(infile)) {
+    auto result = cmReadGccDepfile(infile.c_str());
+    if (!result) {
+      return false;
+    }
+    content = *std::move(result);
+  }
+
+  for (auto& dep : content) {
+    for (auto& rule : dep.rules) {
+      if (!cmSystemTools::FileIsFullPath(rule)) {
+        rule = cmStrCat(prefix, rule);
+      }
+    }
+    for (auto& path : dep.paths) {
+      if (!cmSystemTools::FileIsFullPath(path)) {
+        path = cmStrCat(prefix, path);
+      }
+    }
+  }
+
+  cmsys::ofstream fout(outfile.c_str());
+  if (!fout) {
+    return false;
+  }
+  switch (format) {
+    case cmDepfileFormat::GccDepfile:
+      WriteGccDepfile(fout, content);
+      break;
+    case cmDepfileFormat::VsTlog:
+      WriteVsTlog(fout, content);
+      break;
+  }
+  return true;
+}