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feat: add configurable default theme option #16

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feat: add configurable default theme option #16

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3 changes: 3 additions & 0 deletions README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -30,6 +30,7 @@ Live **Markdown preview** for Neovim with first-class **Mermaid diagram** suppor
instance_mode = "takeover", -- "takeover" (one tab) or "multi" (tab per instance)
port = 0, -- 0 = auto (8421 for takeover, OS-assigned for multi)
open_browser = true,
theme = "dark", -- "dark" or "light"; initial preview theme
debounce_ms = 300,
})
end,
Expand Down Expand Up @@ -120,6 +121,8 @@ require("markdown_preview").setup({

mermaid_renderer = "js", -- "js" (browser mermaid.js) or "rust" (mmdr CLI, ~400x faster)

theme = "dark", -- "dark" or "light"; initial preview theme (toggleable in browser)

scroll_sync = true, -- browser follows cursor position

-- Fraction (0–1): vertical position of the final line when scrolled to end.
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6 changes: 3 additions & 3 deletions assets/index.html
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Original file line number Diff line number Diff line change
@@ -1,5 +1,5 @@
<!doctype html>
<html lang="en" data-theme="dark" data-bottom-padding="__BOTTOM_PADDING__">
<html lang="en" data-theme="__THEME__" data-bottom-padding="__BOTTOM_PADDING__">

<head>
<meta charset="utf-8" />
Expand Down Expand Up @@ -879,7 +879,7 @@ <h1>Markdown Preview</h1>

// ── State ─────────────────────────────────────────────────────
let lastContent = null;
let currentTheme = 'dark';
let currentTheme = document.documentElement.dataset.theme || 'dark';
let mermaidIdCounter = 0;
let sseConnected = false;
const loadedPacks = new Set();
Expand Down Expand Up @@ -1427,7 +1427,7 @@ <h1>Markdown Preview</h1>
// ── Boot ──────────────────────────────────────────────────────
(async function boot() {
try {
applyTheme('dark');
applyTheme(currentTheme);
await sync(true);
} catch (e) {
console.error('[markdown-preview] boot error:', e);
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4 changes: 4 additions & 0 deletions lua/markdown_preview/init.lua
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Expand Up @@ -37,6 +37,9 @@ M.config = {

scroll_sync = true, -- sync browser scroll to cursor position

-- "dark" or "light"; determines the initial theme of the preview page
theme = "dark",

-- Fraction (0–1): vertical position of the final line when scrolled to end.
-- 0.5 = middle of viewport (default), 1.0 = bottom edge (no extra space)
bottom_padding = 0.5,
Expand Down Expand Up @@ -95,6 +98,7 @@ local function write_index(dir)
end
local content = util.read_text(src)
content = content:gsub("__BOTTOM_PADDING__", tostring(M.config.bottom_padding))
content = content:gsub("__THEME__", M.config.theme)
util.write_text(dst, content)
return dst
end
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