Create an Emacs Major ModeTutorialModeTutorial - EmacsWikiEmacs GeneralEmacs Symbol NotationRegular ExpressionRx Expression - Emacs Manualregular expression - EmacsWikiSyntax TableSyntax Table - Emacs WikiFont Lock & FaceLevels of Font Lock - Emacs Manualfont-lock-keywords - Emacs ManualFaces for Font Lock - Emacs ManualFace AttributesExampleIndentation Line Function Example: https://github.com/ziglang/zig-mode/blob/master/zig-mode.el (zig-mode-indent-line)