extended API and added syntax sugar for defining syntax highlighting

.todo.md

@@ -1,14 +1,13 @@
 - [ ] Plugin refresh - 0.4.2 
-  - [ ] Custom syntax highlighting rules 
-  - [ ] Plugin management 
-  - [ ] Expanded editor API
-    - [ ] Update documentation
-    - [X] Fields
-      - [X] visibility of help message
-      - [X] ox version
-      - [X] number of documents open
-      - [X] current document id
-      - [X] file type
+  - [ ] Investigate panics in plug-ins
+  - [ ] Update documentation
+    - [ ] New API
+    - [ ] User defined syntax highlighting
+  - [X] README update
+  - [X] Fix string error
+  - [X] Transfer built-in commands to lua & fix borrowmut panic
+  - [X] Custom syntax highlighting
+  - [X] Expanded editor API
     - [X] Methods
       - [X] Get character
       - [X] Get line
@@ -21,16 +20,22 @@
       - [X] Hide the help message
       - [X] Set file type
       - [X] Set read only status
-  - [X] README update
-  - [X] Fix string error
-  - [X] Transfer built-in commands to lua & fix borrowmut panic
+    - [X] Fields
+      - [X] visibility of help message
+      - [X] ox version
+      - [X] number of documents open
+      - [X] current document id
+      - [X] file type
+      - [X] length of current document
+  - [X] Custom syntax highlighting syntax sugar
 
 - [ ] Editing improvements - 0.4.3 
   - [ ] Better editor navigation (see github issues)
   - [ ] Line swapping 
   - [ ] Bracket and Quote Pairs 
   - [ ] Auto indentation 
   - [ ] Delete word command 
+  - [ ] Add documentation on how to use/see/import/package plugins
 
 - [ ] UI/UX improvements - 0.4.4 
   - [ ] Replace command needs to update syntax 

config/.oxrc

@@ -85,7 +85,7 @@ event_mapping = {
         editor:open_command_line()
     end,
     ["ctrl_h"] = function()
-        editor:set_read_only(false)
+        editor:display_info(editor.document_length)
     end,
 }
 
@@ -218,7 +218,13 @@ syntax:new(
     -- New syntax highlighting for files with the extensions psi and psix
     {"psi", "psix"}, 
     {
-        syntax:keyword("keyword", "pub"),
+        -- Add multiple patterns to make a keyword token
+        syntax:keywords("keyword", {
+            "\\b(pub)\\b", "\\b(fn)\\b", "\\b(return)\\b", 
+        }),
+        -- Define digits
+        syntax:keyword("digit", "([0-9]+)"),
+        -- Create a bounded token for strings (that can be escaped)
         syntax:bounded("string", "\"", "\"", true),
     }
 )

src/config.rs

@@ -111,6 +111,13 @@ impl SyntaxHighlighting {
 
 impl LuaUserData for SyntaxHighlighting {
     fn add_methods<'lua, M: LuaUserDataMethods<'lua, Self>>(methods: &mut M) {
+        methods.add_method_mut("keywords", |lua, _, (name, pattern): (String, Vec<String>)| {
+            let table = lua.create_table()?;
+            table.set("kind", "keyword")?;
+            table.set("name", name)?;
+            table.set("pattern", format!("({})", pattern.join("|")))?;
+            Ok(table)
+        });
         methods.add_method_mut("keyword", |lua, _, (name, pattern): (String, String)| {
             let table = lua.create_table()?;
             table.set("kind", "keyword")?;
@@ -725,6 +732,10 @@ impl LuaUserData for Editor {
             let name = editor.doc().file_name.clone();
             Ok(name)
         });
+        fields.add_field_method_get("document_length", |_, editor| {
+            let len = editor.doc().len_lines();
+            Ok(len)
+        });
         fields.add_field_method_get("version", |_, _| {
             Ok(VERSION)
         });