Add XML support for macOS defaults export and import

Co-authored-by: pablo <pablo@maze.design>

Author: cursoragent

README.md

@@ -222,8 +222,8 @@ dot --postinstall       # Run only postinstall hooks
 dot --postlink          # Run only postlink hooks
 
 # macOS defaults management
-dot --defaults-export   # Export current settings to plist files
-dot --defaults-import   # Import settings from plist files
+dot --defaults-export   # Export current settings to plist/XML files
+dot --defaults-import   # Import settings from plist/XML files
 
 # Upgrade dot itself
 dot --upgrade
@@ -319,21 +319,54 @@ This is useful for:
 
 ## macOS Defaults
 
-Manage macOS system preferences with plist files:
+Manage macOS system preferences with plist or XML files:
 
 ```yaml
 profiles:
   "*":
     dock:
       defaults:
         "com.apple.dock": "macos/dock.plist"
-        "com.apple.finder": "macos/finder.plist"
+        "com.apple.finder": "macos/finder.xml"        # XML format for better readability
+        "com.apple.safari": "macos/safari.plist"      # Binary plist format
 ```
 
-Commands:
-- `dot --defaults-export`: Export current settings to plist files
-- `dot --defaults-import`: Import settings from plist files
-- Normal runs will warn if current settings differ from plist files
+### File Format Support
+
+- **Binary plist** (`.plist`): Standard macOS binary format, compact but not human-readable
+- **XML format** (`.xml`): Human-readable XML format, ideal for version control and manual editing
+
+The tool automatically detects the target file format based on the file extension:
+- Files ending in `.xml` (case-insensitive) are exported as XML using `plutil` conversion
+- All other files are exported as binary plist format
+
+### Commands
+
+- `dot --defaults-export`: Export current settings to plist/XML files
+- `dot --defaults-import`: Import settings from plist/XML files  
+- Normal runs will warn if current settings differ from saved files
+
+### Benefits of XML Format
+
+- **Human-readable**: Easy to view and edit manually
+- **Version control friendly**: Git diffs show meaningful changes
+- **Cross-platform compatible**: Can be viewed on any system
+- **Debugging**: Easier to troubleshoot configuration issues
+
+### Example XML Output
+
+```xml
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+    <key>autohide</key>
+    <true/>
+    <key>tilesize</key>
+    <integer>36</integer>
+</dict>
+</plist>
+```
 
 ## State Management