Source code

Source files render as syntax-highlighted text via syntect with two-face / bat extended grammars — 100+ languages including Rust, Python, JavaScript, TypeScript, C, C++, Java, Go, Ruby, Shell, TOML, Dockerfile.

Highlighting applies automatically when you open a recognized source file; the theme follows the active color theme.

If detection misses, force a language with -L:

cat script | peek -L bash
peek -L rust unknown_file

Config files

Config files highlight through the same path — .ini, .cfg, .conf, .properties, .env, .hcl, .tf, and by-name matches like Makefile, Dockerfile, .gitignore, and .editorconfig. A few filename special cases cover gaps where the extension misleads or is absent: .env.local / .env.production / .envrc highlight as .env, justfile uses the Makefile grammar, and .dockerignore uses the gitignore grammar. Formats with no grammar (.dhall, .cue) show as plain text.

Line numbers

Off by default. Enable at startup with -n / --line-numbers, or toggle with l in the viewer.

Soft wrap

On by default. Toggle with w. When off, Left / Right pan the viewport horizontally (less -S feel).

SQL

.sql / .ddl / .dml / .psql / .pgsql files render as highlighted source. The Info view adds an SQL section: dialect guess (PostgreSQL / MySQL / SQLite / T-SQL / generic), statement count broken down by category (DDL / DML / DQL / TCL / Other), inventories of created objects (tables, views, indexes, functions, triggers), comment-line count, and a flag when an inline $$ … $$ PL/pgSQL block is present.

CSS

.css files render as highlighted source. The Info view adds a CSS section: style-rule count (CSS nesting included), selector count with a per-kind histogram (class / id / element / pseudo / attribute / universal), custom-property count, @media and @keyframes counts, and an @import list — external URLs flagged. A Colors section shows the stylesheet's colour palette as block swatches, most-frequent first. Colour words inside selectors, strings, or comments are not mistaken for colours.