auto update text files in archive after editing

src/main/java/cz/kamma/kfmanager/ui/FileEditor.java

@@ -127,6 +127,10 @@ public class FileEditor extends JFrame {
         this.onSaveSuccess = onSaveSuccess;
     }
 
+    public void setOnSaveSuccess(Runnable onSaveSuccess) {
+        this.onSaveSuccess = onSaveSuccess;
+    }
+
     private void initSearchPanel() {
         searchPanel = new JPanel(new FlowLayout(FlowLayout.LEFT, 5, 2));
         searchPanel.setBorder(BorderFactory.createMatteBorder(0, 0, 1, 0, Color.GRAY));
@@ -1286,12 +1290,16 @@ public class FileEditor extends JFrame {
                 return; // message handled in SwingWorker
             }
 
+            if (onSaveSuccess != null) {
+                onSaveSuccess.run();
+            }
+
             JOptionPane.showMessageDialog(this, 
                     "File saved", 
                     "Success", 
                     JOptionPane.INFORMATION_MESSAGE);
             updateStatus();
-        } catch (IOException e) {
+        } catch (Exception e) {
             JOptionPane.showMessageDialog(this, 
                     "Error during saving:\n" + e.getMessage(), 
                     "Error", 

src/main/java/cz/kamma/kfmanager/ui/MainWindow.java

@@ -2514,7 +2514,7 @@ public class MainWindow extends JFrame {
                             java.util.List<String> cmd = new java.util.ArrayList<>();
                             cmd.add(ext);
                             cmd.add(tempFile.getAbsolutePath());
-                            Process p = new ProcessBuilder(cmd).start();
+                            new ProcessBuilder(cmd).start();
                             // Optional: Monitor process to upload back on exit?
                             // For now internal editor is safer for auto-upload.
                         } catch (Exception ex) {
@@ -2543,6 +2543,22 @@ public class MainWindow extends JFrame {
         }
         
         File file = item.getFile();
+        FilePanelTab activeTab = activePanel != null ? activePanel.getCurrentTab() : null;
+        boolean fileInsideOpenedArchive = activeTab != null && activeTab.isDirectoryInsideOpenedArchive(file.getParentFile());
+        boolean forceInternalEditor = fileInsideOpenedArchive && isLikelyTextFile(file);
+
+        if (forceInternalEditor) {
+            FileEditor editor = new FileEditor(this, file, config, false);
+            editor.setOnSaveSuccess(() -> syncArchiveAfterInternalEdit(file));
+            editor.addWindowListener(new java.awt.event.WindowAdapter() {
+                @Override
+                public void windowClosed(java.awt.event.WindowEvent e) {
+                    requestFocusInActivePanel();
+                }
+            });
+            editor.setVisible(true);
+            return;
+        }
         
         // If an external editor is configured, try launching it with the file path
         String ext = config.getExternalEditorPath();
@@ -2572,6 +2588,105 @@ public class MainWindow extends JFrame {
         editor.setVisible(true);
     }
 
+    private boolean isLikelyTextFile(File file) {
+        if (file == null || !file.isFile()) {
+            return false;
+        }
+        int probeSize = 4096;
+        byte[] probe;
+        try {
+            long size = Files.size(file.toPath());
+            int toRead = (int) Math.min(probeSize, size);
+            probe = new byte[toRead];
+            try (java.io.InputStream in = Files.newInputStream(file.toPath())) {
+                int read = in.read(probe);
+                if (read < 0) {
+                    return true;
+                }
+                if (read < toRead) {
+                    byte[] trimmed = new byte[read];
+                    System.arraycopy(probe, 0, trimmed, 0, read);
+                    probe = trimmed;
+                }
+            }
+        } catch (Exception e) {
+            return false;
+        }
+
+        if (probe.length == 0) {
+            return true;
+        }
+
+        int nonPrintable = 0;
+        for (byte b : probe) {
+            int value = b & 0xFF;
+            if (value == 0) {
+                return false;
+            }
+            boolean printable = value == 9 || value == 10 || value == 13 || (value >= 32 && value <= 126);
+            if (!printable) {
+                nonPrintable++;
+            }
+        }
+        return nonPrintable <= Math.max(1, probe.length / 6);
+    }
+
+    private void syncArchiveAfterInternalEdit(File editedFile) {
+        try {
+            if (activePanel == null) {
+                return;
+            }
+            FilePanelTab activeTab = activePanel.getCurrentTab();
+            if (activeTab == null) {
+                return;
+            }
+            File parentDir = editedFile != null ? editedFile.getParentFile() : null;
+            if (parentDir == null || !activeTab.isDirectoryInsideOpenedArchive(parentDir)) {
+                return;
+            }
+            if (!activeTab.canSyncOpenedArchive()) {
+                throw new IOException("Updating this archive format is not supported");
+            }
+
+            activeTab.syncOpenedArchiveChanges(new FileOperations.ProgressCallback() {
+                @Override
+                public void onProgress(long current, long total, String fileName) {}
+
+                @Override
+                public void onFileProgress(long current, long total) {}
+
+                @Override
+                public boolean isCancelled() {
+                    return false;
+                }
+
+                @Override
+                public FileOperations.OverwriteResponse confirmOverwrite(File source, File target) {
+                    return FileOperations.OverwriteResponse.YES;
+                }
+
+                @Override
+                public FileOperations.ErrorResponse onError(File file, Exception e) {
+                    return FileOperations.ErrorResponse.ABORT;
+                }
+
+                @Override
+                public FileOperations.SymlinkResponse confirmSymlink(File file) {
+                    return FileOperations.SymlinkResponse.FOLLOW;
+                }
+
+                @Override
+                public String requestPassword(String archiveName) {
+                    return null;
+                }
+            });
+
+            activePanel.refresh(false);
+        } catch (Exception ex) {
+            throw new RuntimeException("File saved, but archive sync failed: " + ex.getMessage(), ex);
+        }
+    }
+
     /**
      * Compare files from both panels
      */