Add settings menu (^S)

README.md

@@ -59,7 +59,8 @@ unconfigured nginx container.
 
 ### Editing a document
 
-1. Run `jsonedit <filename>` from your shell.
+1. Run `jsonedit <filename>` from your shell, or run `jsonedit` and press **^O**
+   to browse for a file to open.
 2. Find the value you want to edit and press **e**.
 3. Enter the value usng valid JSON value encoding, for example `"1234"` for the
    string 1234, and `1234` for the integer 1234. Unparsable JSON will be used
@@ -88,6 +89,7 @@ exists.
 - **t** - Toggle tail line guide
 - **b** - Toggle icons before keys
 - **c** - Toggle compact mode
+- **^S** - Open settings menu
 
 ## Caveats
 

src/Editor/Editor.php

@@ -315,7 +315,48 @@ class Editor
                     $this->modified = false;
                     $this->redrawEditor();
                     break;
-    
+
+                case "\x13": // ctrl-s
+                    $sel = null;
+                    $mark = "\u{f657} ";
+                    $clear = "\u{f630} ";
+                
+                    do {
+                        $this->redrawEditor();
+                        $items = [
+                            'collapseBefore' => (Settings::$collapseBefore?$mark:$clear)."Collapse before key",
+                            'compactGroups' => (Settings::$compactGroups?$mark:$clear)."Compact groups",
+                            'quotedKeys' => (Settings::$editorQuotedKeys?$mark:$clear)."Quoted keys",
+                            'tailLine' => (Settings::$tailLine?$mark:$clear)."Show tail line",
+                            'indentationGuides' => (Settings::$indentationGuides?$mark:$clear)."Show indentation guides",
+                            'done' => "  Done"
+                        ];
+                        $sel = (new Menu($this->term, $items, "Settings"))
+                            ->display(0, 0, 40, 0, $sel);
+                        switch ($sel) {
+                            case 'collapseBefore':
+                                Settings::$collapseBefore = !Settings::$collapseBefore;
+                                break;
+                            case 'compactGroups':
+                                Settings::$compactGroups = !Settings::$compactGroups;
+                                $this->list->parseTree();
+                                break;
+                            case 'quotedKeys':
+                                Settings::$editorQuotedKeys = !Settings::$editorQuotedKeys;
+                                break;
+                            case 'tailLine':
+                                Settings::$tailLine = !Settings::$tailLine;
+                                break;
+                            case 'indentationGuides':
+                                Settings::$indentationGuides = !Settings::$indentationGuides;
+                                break;
+                            case null:
+                                break(2);                            
+                        }
+                    } while ($sel != 'done');
+                    $this->redrawEditor();
+                    break;
+                        
                 case "\x0F": // ctrl-o
                     $this->doOpenFile();
                     break;