dsh-custom-fonts

Customize the Chinese and English fonts, the code font, and the global font size of the DeepSeek Harness Web UI — right from a settings page, with a live preview.

中文说明

What it does

A pure client-side plugin (no host half, no restart needed). Once installed it adds a Fonts (字体) page under Settings:

• UI font · English — used for Latin characters. (Segoe UI, Arial, Georgia, Consolas…)
• UI font · Chinese — used for Han characters. (微软雅黑 / 宋体 / 黑体 / 楷体 / 思源黑体 / 苹方…)
• English glyph scale — 100–160 % slider that enlarges Latin glyphs only (no layout change), to balance mono CJK faces that draw Han noticeably taller than Latin capitals (Maple Mono NL NF CN: ~23 %).
• Code font — a separate mono face for code blocks and inline code (pre/code/kbd/samp). (Consolas, JetBrains Mono, Fira Code, Cascadia Code, Sarasa Mono SC…)
• Content font-size offset — -4..+8 px, equivalent to temporarily shifting the app's own font-size setting; body text, headings, tables and code blocks all move together, no per-level cascade.
• Live preview — mixed Chinese/English UI sample plus a code-font sample render as you type (comma-separated font lists and free-form names are both supported).
• Persistence — fonts, scale and offset are stored in localStorage and replayed on load, so a refresh keeps them without opening the settings page.
• Reset — clears every control and removes all injected styles.

How it works

The plugin injects one global stylesheet:

:root { --dsh-custom-fonts-en: 'English'; --dsh-custom-fonts-zh: 'Chinese'; }
@font-face {                                  /* English glyph scale ≠ 100% */
  font-family: "dsh-latin-scaled";
  src: local('English'), local('English Regular');
  unicode-range: U+0000-024F, U+1E00-1EFF;    /* Latin blocks only */
  size-adjust: 120%;
}
body, body * { font-family: 'English font', 'Chinese font' !important; }
pre, code, kbd, samp { font-family: 'Code font' !important; }
body {                                        /* offset ≠ 0 only */
  --dsh-content-font-size: 17px !important;
  --dsh-content-font-delta: 3px !important;
  --dsh-content-font-size-secondary: 15px !important;
  --dsh-content-font-delta-secondary: 2px !important;
}

• The font-family fallback chain is the standard way to split fonts by script: Latin characters match the English font first, and Han characters — which the English font has no glyphs for — fall back to the Chinese font. No language detection, no DOM surgery.
• The code-font rule comes later and wins inside code regions only.
• The English glyph scale renders a Latin-only copy of the same local font through @font-face + size-adjust; Han glyphs are untouched. unicode-range deliberately excludes U+2000-206F / 3000-303F / FF00-FFEF so Chinese punctuation is not enlarged, and if local() cannot resolve the face the @font-face simply never loads — the plain stack stays.
• The size offset rewrites the app's own content-size tokens. The theme declares --dsh-content-font-size and friends on <body>, and descendants only reference those variables, so overriding font-size on arbitrary elements cannot reach them; the plugin writes concrete px values on body instead. The new value is the body's original --dsh-content-font-size plus N, injected only while the offset is non-zero, and recomputed when the app changes the body style — so both settings can be combined.

Changes apply immediately and globally (message body, sidebar, inputs, everything).

Install

From the plugin market (Settings → Plugin Market) once the entry is published, or:

dsh plugin --profile web add dsh-custom-fonts

or directly from the repository:

dsh plugin --profile web add github:it-glen/dsh-custom-fonts

Client-only plugin: after a page refresh it is live — no restart required.

Uninstall

Remove it from Settings → Plugins → Plugin configuration (or dsh plugin --profile web remove dsh-custom-fonts), refresh the page; your fonts are reverted automatically.

License

MIT

Forked from lsh2002/dsh-custom-fonts v1.1.0; this fork adds the English glyph scale, settings persistence and the content font-size offset fix.