1 files changed, 79 insertions, 0 deletions
diff --git a/zen/file_path.cpp b/zen/file_path.cpp
new file mode 100644
index 00000000..d846e804
--- /dev/null
+++ b/zen/file_path.cpp
@@ -0,0 +1,79 @@
+// *****************************************************************************
+// * This file is part of the FreeFileSync project. It is distributed under    *
+// * GNU General Public License: https://www.gnu.org/licenses/gpl-3.0          *
+// * Copyright (C) Zenju (zenju AT freefilesync DOT org) - All Rights Reserved *
+// *****************************************************************************
+
+#include "file_path.h"
+
+using namespace zen;
+
+
+std::optional<PathComponents> zen::parsePathComponents(const Zstring& itemPath)
+{
+    auto doParse = [&](int sepCountVolumeRoot, bool rootWithSep) -> std::optional<PathComponents>
+    {
+        const Zstring itemPathFmt = appendSeparator(itemPath); //simplify analysis of root without separator, e.g. \\server-name\share
+        int sepCount = 0;
+        for (auto it = itemPathFmt.begin(); it != itemPathFmt.end(); ++it)
+            if (*it == FILE_NAME_SEPARATOR)
+                if (++sepCount == sepCountVolumeRoot)
+                {
+                    Zstring rootPath(itemPathFmt.begin(), rootWithSep ? it + 1 : it);
+
+                    Zstring relPath(it + 1, itemPathFmt.end());
+                    trim(relPath, true, true, [](Zchar c) { return c == FILE_NAME_SEPARATOR; });
+
+                    return PathComponents({rootPath, relPath});
+                }
+        return {};
+    };
+
+    std::optional<PathComponents> pc; //"/media/zenju/" and "/Volumes/" should not fail to parse
+
+    if (!pc && startsWith(itemPath, "/mnt/")) //e.g. /mnt/DEVICE_NAME
+        pc = doParse(3 /*sepCountVolumeRoot*/, false /*rootWithSep*/);
+
+    if (!pc && startsWith(itemPath, "/media/")) //Ubuntu: e.g. /media/zenju/DEVICE_NAME
+        if (const char* username = ::getenv("USER"))
+            if (startsWith(itemPath, std::string("/media/") + username + "/"))
+                pc = doParse(4 /*sepCountVolumeRoot*/, false /*rootWithSep*/);
+
+    if (!pc && startsWith(itemPath, "/run/media/")) //CentOS, Suse: e.g. /run/media/zenju/DEVICE_NAME
+        if (const char* username = ::getenv("USER"))
+            if (startsWith(itemPath, std::string("/run/media/") + username + "/"))
+                pc = doParse(5 /*sepCountVolumeRoot*/, false /*rootWithSep*/);
+
+    if (!pc && startsWith(itemPath, "/run/user/")) //Ubuntu, e.g.: /run/user/1000/gvfs/smb-share:server=192.168.62.145,share=folder
+    {
+        Zstring tmp(itemPath.begin() + strLength("/run/user/"), itemPath.end());
+        tmp = beforeFirst(tmp, "/gvfs/", IfNotFoundReturn::none);
+        if (!tmp.empty() && std::all_of(tmp.begin(), tmp.end(), [](char c) { return isDigit(c); }))
+        /**/pc = doParse(6 /*sepCountVolumeRoot*/, false /*rootWithSep*/);
+    }
+
+
+    if (!pc && startsWith(itemPath, "/"))
+        pc = doParse(1 /*sepCountVolumeRoot*/, true /*rootWithSep*/);
+
+    return pc;
+}
+
+
+std::optional<Zstring> zen::getParentFolderPath(const Zstring& itemPath)
+{
+    if (const std::optional<PathComponents> comp = parsePathComponents(itemPath))
+    {
+        if (comp->relPath.empty())
+            return std::nullopt;
+
+        const Zstring parentRelPath = beforeLast(comp->relPath, FILE_NAME_SEPARATOR, IfNotFoundReturn::none);
+        if (parentRelPath.empty())
+            return comp->rootPath;
+        return appendSeparator(comp->rootPath) + parentRelPath;
+    }
+    assert(false);
+    return std::nullopt;
+}
+
+