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feat: dark mode and a theme toggle in the generated viewer #14

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fc6f865
feat: dark mode and a theme toggle in the generated viewer
Aug 31, 2026
27f2b63
docs: add viewer dark-mode screenshots
Aug 31, 2026
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16 changes: 10 additions & 6 deletions fixtures/valid-render-lint-unsupported/expected-export.manifest.json
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Expand Up @@ -97,25 +97,29 @@
"sha256": "615c0d875de2ec25e22bba41b5cd0e1184517a90916cfac8a4be8467539a5c8f",
"size": 5852
},
"assets/theme-init.js": {
"sha256": "edb9ae148a89f3a052ebe49051520bb842befbdd8a5fd546251423f80fef0a93",
"size": 1224
},
"assets/third-party-licenses.txt": {
"sha256": "010843d18dd532c01a574a44e86699966ca633fd5bbafe79125bb4c9e247f5b6",
"size": 20065
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"assets/viewer-boot.js": {
"sha256": "39b1335cc5e4783865d0d83dd187248338bb7ae369e48e30d153780df810bf54",
"size": 14016
"sha256": "c5324bcff4b39074ea4189d393d8d50da0dcae5da794150245b187a32829e36c",
"size": 19980
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"assets/vue.css": {
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"assets/zoom-image.min.js": {
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"index.html": {
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"size": 13973
}
}
}
16 changes: 10 additions & 6 deletions fixtures/valid-render-subset/expected-export.manifest.json
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Expand Up @@ -97,25 +97,29 @@
"sha256": "615c0d875de2ec25e22bba41b5cd0e1184517a90916cfac8a4be8467539a5c8f",
"size": 5852
},
"assets/theme-init.js": {
"sha256": "edb9ae148a89f3a052ebe49051520bb842befbdd8a5fd546251423f80fef0a93",
"size": 1224
},
"assets/third-party-licenses.txt": {
"sha256": "010843d18dd532c01a574a44e86699966ca633fd5bbafe79125bb4c9e247f5b6",
"size": 20065
},
"assets/viewer-boot.js": {
"sha256": "39b1335cc5e4783865d0d83dd187248338bb7ae369e48e30d153780df810bf54",
"size": 14016
"sha256": "c5324bcff4b39074ea4189d393d8d50da0dcae5da794150245b187a32829e36c",
"size": 19980
},
"assets/vue.css": {
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"sha256": "86dda62ad32cdff3e50930ee1c32f8f61547ca75494f8808c668979a1bd13751",
"size": 35495
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"assets/zoom-image.min.js": {
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"index.html": {
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"size": 13973
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}
}
16 changes: 10 additions & 6 deletions fixtures/valid-trust-canary-dot-root/.expected-export.manifest.json
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Expand Up @@ -97,25 +97,29 @@
"sha256": "615c0d875de2ec25e22bba41b5cd0e1184517a90916cfac8a4be8467539a5c8f",
"size": 5852
},
"assets/theme-init.js": {
"sha256": "edb9ae148a89f3a052ebe49051520bb842befbdd8a5fd546251423f80fef0a93",
"size": 1224
},
"assets/third-party-licenses.txt": {
"sha256": "010843d18dd532c01a574a44e86699966ca633fd5bbafe79125bb4c9e247f5b6",
"size": 20065
},
"assets/viewer-boot.js": {
"sha256": "39b1335cc5e4783865d0d83dd187248338bb7ae369e48e30d153780df810bf54",
"size": 14016
"sha256": "c5324bcff4b39074ea4189d393d8d50da0dcae5da794150245b187a32829e36c",
"size": 19980
},
"assets/vue.css": {
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"size": 28873
"sha256": "86dda62ad32cdff3e50930ee1c32f8f61547ca75494f8808c668979a1bd13751",
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"index.html": {
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"sha256": "2da991889572fb84e9f598e8b8256168dfece9022f6b803664c7a5376120201f",
"size": 13973
}
}
}
16 changes: 10 additions & 6 deletions fixtures/valid-trust-canary-nested-root/expected-export.manifest.json
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Expand Up @@ -97,25 +97,29 @@
"sha256": "615c0d875de2ec25e22bba41b5cd0e1184517a90916cfac8a4be8467539a5c8f",
"size": 5852
},
"assets/theme-init.js": {
"sha256": "edb9ae148a89f3a052ebe49051520bb842befbdd8a5fd546251423f80fef0a93",
"size": 1224
},
"assets/third-party-licenses.txt": {
"sha256": "010843d18dd532c01a574a44e86699966ca633fd5bbafe79125bb4c9e247f5b6",
"size": 20065
},
"assets/viewer-boot.js": {
"sha256": "39b1335cc5e4783865d0d83dd187248338bb7ae369e48e30d153780df810bf54",
"size": 14016
"sha256": "c5324bcff4b39074ea4189d393d8d50da0dcae5da794150245b187a32829e36c",
"size": 19980
},
"assets/vue.css": {
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"size": 28873
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"size": 35495
},
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"index.html": {
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"sha256": "2da991889572fb84e9f598e8b8256168dfece9022f6b803664c7a5376120201f",
"size": 13973
}
}
}
16 changes: 10 additions & 6 deletions fixtures/valid-unified-leji-fresh/expected-export.manifest.json
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Expand Up @@ -97,25 +97,29 @@
"sha256": "615c0d875de2ec25e22bba41b5cd0e1184517a90916cfac8a4be8467539a5c8f",
"size": 5852
},
"assets/theme-init.js": {
"sha256": "edb9ae148a89f3a052ebe49051520bb842befbdd8a5fd546251423f80fef0a93",
"size": 1224
},
"assets/third-party-licenses.txt": {
"sha256": "010843d18dd532c01a574a44e86699966ca633fd5bbafe79125bb4c9e247f5b6",
"size": 20065
},
"assets/viewer-boot.js": {
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"size": 14016
"sha256": "c5324bcff4b39074ea4189d393d8d50da0dcae5da794150245b187a32829e36c",
"size": 19980
},
"assets/vue.css": {
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"index.html": {
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"sha256": "2da991889572fb84e9f598e8b8256168dfece9022f6b803664c7a5376120201f",
"size": 13973
}
}
}
16 changes: 10 additions & 6 deletions fixtures/valid-unified-leji-stale-tree/expected-export.manifest.json
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"sha256": "615c0d875de2ec25e22bba41b5cd0e1184517a90916cfac8a4be8467539a5c8f",
"size": 5852
},
"assets/theme-init.js": {
"sha256": "edb9ae148a89f3a052ebe49051520bb842befbdd8a5fd546251423f80fef0a93",
"size": 1224
},
"assets/third-party-licenses.txt": {
"sha256": "010843d18dd532c01a574a44e86699966ca633fd5bbafe79125bb4c9e247f5b6",
"size": 20065
},
"assets/viewer-boot.js": {
"sha256": "39b1335cc5e4783865d0d83dd187248338bb7ae369e48e30d153780df810bf54",
"size": 14016
"sha256": "c5324bcff4b39074ea4189d393d8d50da0dcae5da794150245b187a32829e36c",
"size": 19980
},
"assets/vue.css": {
"sha256": "61d5ec46e3b2235b55a5ed038ff4451ffef42b9a5fed5dfb926918082159dda3",
"size": 28873
"sha256": "86dda62ad32cdff3e50930ee1c32f8f61547ca75494f8808c668979a1bd13751",
"size": 35495
},
"assets/zoom-image.min.js": {
"sha256": "c142e32432c4fd0d47ea1a6d5640a66d4ffa9a331496a5bdb45c0449f6d381f9",
"size": 17077
},
"index.html": {
"sha256": "c5b7f84230d0c6a2c59ae45e2dae69a327b5ec792b4134e07257aec84273428a",
"size": 11350
"sha256": "2da991889572fb84e9f598e8b8256168dfece9022f6b803664c7a5376120201f",
"size": 13973
}
}
}
7 changes: 4 additions & 3 deletions packages/sdk-go/internal/assets/assets-manifest.json
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"templates/viewer/assets/source-sans-pro-600-latin-ext.woff2": "sha256:9d8b9b83f39fe3768c876486e92bb995c1a92c9e85b69481da84e5444ecc980f",
"templates/viewer/assets/source-sans-pro-600-latin.woff2": "sha256:156650610835fe32914722ecfc8dab0ebbb84795e201b842158afa0ea873cfa4",
"templates/viewer/assets/source-sans-pro-600-vietnamese.woff2": "sha256:615c0d875de2ec25e22bba41b5cd0e1184517a90916cfac8a4be8467539a5c8f",
"templates/viewer/assets/theme-init.js": "sha256:edb9ae148a89f3a052ebe49051520bb842befbdd8a5fd546251423f80fef0a93",
"templates/viewer/assets/third-party-licenses.txt": "sha256:010843d18dd532c01a574a44e86699966ca633fd5bbafe79125bb4c9e247f5b6",
"templates/viewer/assets/viewer-boot.js": "sha256:39b1335cc5e4783865d0d83dd187248338bb7ae369e48e30d153780df810bf54",
"templates/viewer/assets/vue.css": "sha256:61d5ec46e3b2235b55a5ed038ff4451ffef42b9a5fed5dfb926918082159dda3",
"templates/viewer/assets/viewer-boot.js": "sha256:c5324bcff4b39074ea4189d393d8d50da0dcae5da794150245b187a32829e36c",
"templates/viewer/assets/vue.css": "sha256:86dda62ad32cdff3e50930ee1c32f8f61547ca75494f8808c668979a1bd13751",
"templates/viewer/assets/zoom-image.min.js": "sha256:c142e32432c4fd0d47ea1a6d5640a66d4ffa9a331496a5bdb45c0449f6d381f9",
"templates/viewer/index.html": "sha256:fd6e43cde0d72678dd26c9ad38753f046ed3c5e3e550fbd211c0f4307edd8806",
"templates/viewer/index.html": "sha256:0c608f85b79a9842e6311621991b19c8b6caa4c8ac8b5dec81f9104c302e0695",
"templates/writing-style.md": "sha256:ee17bb1b97cbe87c4d8ef59b80b2e1d03d997d8839a98d3eb2080c540efa7b2c"
}
}
23 changes: 23 additions & 0 deletions packages/sdk-go/internal/assets/templates/viewer/assets/theme-init.js
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@@ -0,0 +1,23 @@
// Theme bootstrap for the Leji viewer. Loaded synchronously in <head> so it runs
// before any body paint: it resolves the effective theme — the reader's persisted
// choice (system|light|dark), else the OS scheme — and writes it to
// <html data-theme>. The first paint is therefore already the right theme: no
// light flash for a dark reader, and no wrong-theme flash for a reader who chose
// otherwise. viewer-boot.js owns the runtime toggle (it re-applies the same
// attribute on load and reacts to OS changes); this file exists only to beat the
// first paint. Keep the storage key and the resolve rule in lockstep with the
// boot script's theme module.
(function () {
var KEY = 'leji-viewer-theme';
var mode = 'system';
try {
var v = window.localStorage.getItem(KEY);
if (v === 'light' || v === 'dark' || v === 'system') mode = v;
} catch (e) {
// storage blocked: fall through to the OS scheme
}
var systemDark =
typeof window.matchMedia === 'function' && window.matchMedia('(prefers-color-scheme: dark)').matches;
var effective = mode === 'system' ? (systemDark ? 'dark' : 'light') : mode;
document.documentElement.setAttribute('data-theme', effective);
})();
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