LeoVasanko
5769747a95
CodeMirror measures text per character; Fira Code's ligature glyphs render wider than the measured sum of their parts, corrupting cursor and selection rendering. The font is set on .cm-content with ligatures off, and inner spans inherit it for consistent metrics.
57 lines
2.4 KiB
JavaScript
57 lines
2.4 KiB
JavaScript
// Shared CodeMirror styling for both editors: a light theme matching the
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// site's inputs, and a highlight style in the site palette — the default
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// highlight style (from basicSetup) underlines headings/links and uses
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// colors that clash with the page.
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import { EditorView } from 'codemirror'
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import { HighlightStyle, syntaxHighlighting } from '@codemirror/language'
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import { tags } from '@lezer/highlight'
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// The base theme sets monospace on .cm-scroller, so the font must be set
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// there, not on "&".
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export const cmTheme = EditorView.theme({
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"&": {
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backgroundColor: "var(--bg)",
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color: "var(--text)",
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},
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".cm-scroller": { fontFamily: '"Fira Code", monospace' },
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// Fira Code in CodeMirror: set the font on .cm-content (not only the
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// scroller) and force every span inside to inherit it, so highlighting
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// spans can't drift to a different font/metrics. Ligatures are disabled
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// entirely — CodeMirror measures per character, and ligature glyphs
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// render wider than the measured sum of their parts.
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".cm-content": {
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caretColor: "var(--text)",
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fontFamily: '"Fira Code", monospace',
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fontVariantLigatures: "none",
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fontFeatureSettings: '"calt" 0',
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letterSpacing: "normal",
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},
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".cm-content *": {
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fontFamily: "inherit",
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letterSpacing: "inherit",
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},
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".cm-cursor": { borderLeftColor: "var(--text)" },
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// basicSetup's active-line highlight assumes a dark theme.
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".cm-activeLine": { backgroundColor: "transparent" },
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"&.cm-focused .cm-selectionBackground, .cm-selectionBackground":
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{ backgroundColor: "var(--line)" },
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"&.cm-focused": { outline: "none" },
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})
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export const cmHighlight = syntaxHighlighting(HighlightStyle.define([
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{ tag: tags.heading, fontWeight: "600", color: "var(--accent)" },
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{ tag: tags.strong, fontWeight: "700" },
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{ tag: tags.emphasis, fontStyle: "italic" },
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{ tag: tags.strikethrough, textDecoration: "line-through" },
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{ tag: tags.link, color: "var(--accent2)" },
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{ tag: tags.url, color: "var(--muted)" },
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{ tag: tags.monospace, color: "var(--accent2)" },
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{ tag: tags.quote, color: "var(--muted)", fontStyle: "italic" },
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// HTML (banner editor) and Markdown raw blocks
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{ tag: tags.tagName, color: "var(--accent)" },
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{ tag: tags.attributeName, color: "var(--accent2)" },
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{ tag: tags.attributeValue, color: "var(--text)" },
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{ tag: tags.comment, color: "var(--muted)" },
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{ tag: tags.processingInstruction, color: "var(--muted)" },
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]))
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