Press Space. See it instantly.

highlight.goGo · github

1package preview

3import "strings"

5// Render highlights src with the active theme.

6func Render(lang string, src []byte) string {

7 lex := registry.Get(lang) // 292 lexers

8if lex == nil {

9return strings.TrimSpace(string(src))

10 }

11 toks := lex.Tokenise(src)

12 out := Paint(toks, Theme) // 3 themes

13return out

14}

440+ syntax formats·LF·2.1 KB

01Code — line numbers, real token colours, no editor required.

highlight.gogithub

1package preview

3import "strings"

5// Render highlights src with the active theme.

6func Render(lang string, src []byte) string {

7 lex := registry.Get(lang) // 292 lexers

8if lex == nil {

9return strings.TrimSpace(string(src))

10 }

11 toks := lex.Tokenise(src)

12 out := Paint(toks, Theme) // 3 themes

13return out

14}

theme·github·applies to all 440+ formats

02Themes — three shipped palettes, switched live. Tap a tab.

README.mdMarkdown

CosmoQuickView

A Quick Look extender for macOS. Select a file, press Space, and read it — source, schemas, diagrams, math and specimens, all rendered locally.

What renders

Capability	Coverage	Engine
Syntax highlighting	440+ formats	Chroma + TextMate
Diagrams	.mmd, fenced	Mermaid
Mathematics	inline + display	MathJax

Shipped

292 Chroma lexers, auto-discovered
TextMate engine: astro, prisma, cairo, pug, haml
Your grammar here — pull requests welcome

Mermaid + MathJax render inside the preview

03Markdown — rendered, not dumped: headings, tables, checklists.

users.parquetApache Parquet

rows 1,284,930row groups 12size 48.6 MB

Schema

column	type	logical	null%
id	INT64	—	0.00
name	BYTE_ARRAY	STRING · UTF8	0.02
created	INT64	TIMESTAMP · MICROS	0.00

First 4 rows

id	name	created
1001	ada	2024-02-11 09:14:02
1002	grace	2024-02-11 09:15:47
1003	alan	2024-02-12 11:02:19
1004	katherine	2024-02-12 14:38:55

also·Arrow/Feather·Avro·Stata .dta·dBASE .dbf·binary plist

04Data — schema, column types, row counts, and a peek at the rows.

flow.mmdMermaid

graph TD·4 nodes·rendered in-preview

05Diagrams — Mermaid sources render as vectors, not as text.

paper.mdMathJax

Calibrating the ranker

§3 · Loss and link function

We model the click probability with a logistic link. For each impression i, the predicted label is

ŷ_i = σ11 + e^−z_i, z_i = p∑j=1w_j x_ij

(3.1)

where σ is the logistic function, the weights w live in ℝ^p, and the negative log-likelihood L(θ) = −∑_i [ y_i log ŷ_i + (1−y_i) log(1−ŷ_i) ] is minimised by Newton steps. Generalisation error stays below √(p / n) for n ≥ 10⁴.

inline + display math·typeset in the preview

06Math — LaTeX in Markdown typesets inline and on its own line.

2 itemsImage · Video

poster.png·image

1920 × 1080 · PNG · 2.4 MB

demo.mov·QuickTime video

images·audio·video·hardware decoded

07Media — dimensions, thumbnails and a working transport.

Inter SemiBold.ttfTrueType

44Aa Bb Cc 0-9

24Aa Bb Cc 0-9

14Aa Bb Cc 0-9

The quick brown fox jumps over the lazy dog · 0123456789 & !?“”

Weight axis

FamilyInter

Weight600 SemiBold

StyleNormal

Axeswght (static)

FormatTrueType

Glyphs982

ttf·otf·woff·woff2 specimens

08Fonts — a real specimen, with weight and axis metadata.

Press Space.
See it instantly.

Eight previews, built by hand.

CosmoQuickView

What renders

Shipped

Calibrating the ranker

The rest of your disk, previewed too.

Stock macOS gives you gray mush.

Every file, handled.

Three steps. No app store.

Clone & install

Select any file

Press Space

Check if your file is supported.

Press Space.See it instantly.

Eight previews, built by hand.

CosmoQuickView

What renders

Shipped

Calibrating the ranker

The rest of your disk, previewed too.

Stock macOS gives you gray mush.

Every file, handled.

Three steps. No app store.

Clone & install

Select any file

Press Space

Check if your file is supported.

Press Space.
See it instantly.