Fixes #13274: Allow cygwin-paths on Windows

jablib/src/main/java/org/jabref/logic/util/io/FileUtil.java

@@ -25,6 +25,7 @@
 import org.jabref.logic.FilePreferences;
 import org.jabref.logic.citationkeypattern.BracketedPattern;
 import org.jabref.logic.layout.format.RemoveLatexCommandsFormatter;
+import org.jabref.logic.os.OS;
 import org.jabref.logic.util.StandardFileType;
 import org.jabref.model.database.BibDatabase;
 import org.jabref.model.database.BibDatabaseContext;
@@ -589,4 +590,34 @@ public static String shortenFileName(String fileName, Integer maxLength) {
     public static boolean isCharLegal(char c) {
         return Arrays.binarySearch(ILLEGAL_CHARS, c) < 0;
     }
+
+    /**
+     * Converts a Cygwin-style file path to a Windows-style path, if the operating system is Windows.
+     *
+     * Supported formats:
+     * - /cygdrive/c/Users/...   → C:\Users\...
+     * - /c/Users/...            → C:\Users\...
+     *
+     * @param filePath the input file path
+     * @return the converted path if running on Windows and path is in Cygwin format; otherwise, returns the original path
+     */
+    public static String convertCygwinPathToWindows(String filePath) {
+        if (!OS.WINDOWS || filePath == null) {
+            return filePath;
+        }
+
+        if (filePath.startsWith("/cygdrive/") && filePath.length() > 10) {
+            String driveLetter = filePath.substring(10, 11).toUpperCase();
+            String path = filePath.substring(11).replace("/", "\\\\");
+            return driveLetter + ":" + path;
+        }
+
+        if (filePath.matches("^/[a-zA-Z]/.*")) {
+            String driveLetter = filePath.substring(1, 2).toUpperCase();
+            String path = filePath.substring(2).replace("/", "\\\\");
+            return driveLetter + ":" + path;
+        }
+
+        return filePath;
+    }
 }

jablib/src/test/java/org/jabref/logic/util/io/FileUtilTest.java

@@ -21,6 +21,7 @@
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Test;
 import org.junit.jupiter.api.condition.DisabledOnOs;
+import org.junit.jupiter.api.condition.EnabledOnOs;
 import org.junit.jupiter.api.io.TempDir;
 import org.junit.jupiter.params.ParameterizedTest;
 import org.junit.jupiter.params.provider.Arguments;
@@ -518,4 +519,18 @@ void illegalPaths(String fileName) {
     void shortenFileName(String expected, String fileName, Integer maxLength) {
         assertEquals(expected, FileUtil.shortenFileName(fileName, maxLength));
     }
+
+    @EnabledOnOs(value = org.junit.jupiter.api.condition.OS.WINDOWS)
+    @ParameterizedTest
+    @ValueSource(strings = {"/c/Users/username/Downloads/test.bib", "/cygdrive/c/Users/username/Downloads/test.bib"})
+    void convertCygwinPathToWindowsShouldConvertToWindowsFormatWhenRunningOnWindows(String filePath) {
+        assertEquals("C:\\\\Users\\\\username\\\\Downloads\\\\test.bib", FileUtil.convertCygwinPathToWindows(filePath));
+    }
+
+    @DisabledOnOs(value = org.junit.jupiter.api.condition.OS.WINDOWS, disabledReason = "Test in others operational systems")
+    @ParameterizedTest
+    @ValueSource(strings = {"/home/username/Downloads/test.bib"})
+    void convertCygwinPathToWindowsShouldReturnOriginalFilePathWhenRunningOnWindows(String filePath) {
+        assertEquals(filePath, FileUtil.convertCygwinPathToWindows(filePath));
+    }
 }