static/monaco-config.ts

// Copyright (c) 2021, Compiler Explorer Authors
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import _ from 'underscore';
import * as monaco from 'monaco-editor';

import {SiteSettings} from './settings';

const DEFAULT_MONACO_CONFIG = {
    fontFamily: 'Consolas, "Liberation Mono", Courier, monospace',
    scrollBeyondLastLine: true,
    quickSuggestions: false,
    fixedOverflowWidgets: true,
    minimap: {
        maxColumn: 80,
    },
    folding: true,
    lineNumbersMinChars: 1,
    emptySelectionClipboard: true,
};

type EditorKinds = monaco.editor.IStandaloneDiffEditor | monaco.editor.IStandaloneCodeEditor;

/** Pick consturction options based on editor kind */
type EditorConstructionType<E extends EditorKinds> = E extends monaco.editor.IStandaloneDiffEditor
    ? monaco.editor.IDiffEditorConstructionOptions
    : monaco.editor.IStandaloneEditorConstructionOptions;

/**
 * Extend the default monaco editor construction options.
 *
 * Type parameter E indicates which editor kind you're constructing a config
 * for. Valid options are EditorKinds, aka monaco.editor.IStandaloneDiffEditor
 * or monaco.editor.IStandaloneCodeEditor
 *
 * TODO(supergrecko): underscore.extend yields any, can we improve the type
 *  check on this?
 */
export function extendConfig<
    E extends EditorKinds = monaco.editor.IStandaloneCodeEditor,
    T = EditorConstructionType<E>
>(overrides: T, settings?: Pick<SiteSettings, 'editorsFFont' | 'autoIndent' | 'useVim' | 'editorsFLigatures'>): T {
    if (settings !== undefined) {
        return _.extend(
            {},
            DEFAULT_MONACO_CONFIG,
            {
                fontFamily: settings.editorsFFont,
                autoIndent: settings.autoIndent ? 'advanced' : 'none',
                vimInUse: settings.useVim,
                fontLigatures: settings.editorsFLigatures,
            },
            overrides
        );
    }
    return _.extend({}, DEFAULT_MONACO_CONFIG, overrides);
}