static/colour.ts

// Copyright (c) 2016, Compiler Explorer Authors
// All rights reserved.
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import * as monaco from 'monaco-editor';

export type AppTheme = 'default' | 'dark' | 'all';

interface ColourScheme {
    name: string;
    desc: string;
    count: number;
    themes: AppTheme[];
}

// If you want to use a scheme in every theme, set `theme: ['all']`
export const schemes: ColourScheme[] = [
    {name: 'rainbow', desc: 'Rainbow 1', count: 12, themes: ['default']},
    {name: 'rainbow2', desc: 'Rainbow 2', count: 12, themes: ['default']},
    {name: 'earth', desc: 'Earth tones (colourblind safe)', count: 9, themes: ['default']},
    {name: 'green-blue', desc: 'Greens and blues (colourblind safe)', count: 4, themes: ['default']},
    {name: 'gray-shade', desc: 'Gray shades', count: 4, themes: ['dark']},
    {name: 'rainbow-dark', desc: 'Dark Rainbow', count: 12, themes: ['dark']},
];

export function applyColours(
    editor: monaco.editor.ICodeEditor,
    colours: Record<number, number>,
    schemeName: string,
    previousDecorations: string[]
): string[] {
    const scheme = schemes.find((scheme) => scheme.name === schemeName) ?? schemes[0];
    const newDecorations: monaco.editor.IModelDeltaDecoration[] = Object.entries(colours)
        .map(([line, index]) => {
            const realLineNumber = parseInt(line) + 1;
            return {
                range: new monaco.Range(realLineNumber, 1, realLineNumber, 1),
                options: {
                    isWholeLine: true,
                    className: 'line-linkage ' + scheme.name + '-' + (index % scheme.count),
                },
            };
        });

    return editor.deltaDecorations(previousDecorations, newDecorations);
}