feat(output): hyperlink URL table cells - #825

Motivation

Table values are deliberately shortened to keep output readable, but that makes URL cells less useful, as the visible value no longer contains the complete target. This means even if a terminal is set up to allow hyperlink clicks, it'll be the entirely wrong URL.

Terminals already have a way to separate a compact label from its destination: OSC 8 links let us keep the existing table layout while making the original URL available on hover or click.

Changes

When stdout is an interactive terminal, Pup now makes valid HTTP(S) strings that occupy an entire table cell clickable. The displayed value keeps its existing compact preview, while the link target uses the complete original URL. This applies to horizontal, vertical, and scalar tables.

Only whole-cell URL strings are linked. URLs embedded in prose or array previews remain ordinary text, and malformed or non-HTTP(S) targets are rejected.

Links are disabled in agent mode and redirected or piped output. NO_COLOR, CLICOLOR=0, and TERM=dumb keep output plain, and PUP_HYPERLINKS=0 provides a link-specific opt-out.

OSC 8 adds behavior, not decoration, so static output is intentionally unchanged.

Before

After (hover)

Implementation question

This enables comfy_table's custom_styling feature so OSC 8 control sequences don't count toward table width. That's much simpler and less error-prone than maintaining a custom post-render pass, but the feature applies ANSI-aware width calculation to every native table, including tables without links. comfy_table documents roughly 30–50% slower table formatting, and enabling it adds eight transitive dependencies.

Is that an acceptable tradeoff for Pup, or would you prefer a narrower implementation?

QA

• Render a long HTTP(S) value with --output table, hover or click the shortened label, and confirm it uses the complete original URL.
• Render horizontal, vertical, and scalar tables containing whole-cell URLs and confirm each is linked.
• Render a URL embedded in prose or an array preview and confirm it remains ordinary text.
• Set PUP_HYPERLINKS=0, NO_COLOR=1, or CLICOLOR=0 and confirm no OSC 8 sequences are emitted.
• Pipe table output to another command and confirm it remains plain.

Automated coverage verifies terminal capability detection, full targets behind shortened labels, each table layout, unsafe and embedded URL rejection, opt-outs, and preservation of invisible Unicode separators.

• cargo test -- --test-threads=1 — 2,004 passed
• cargo fmt --check
• cargo clippy --all-targets -- -D warnings

Blast Radius

Interactive human table output, plus the comfy_table width-calculation path for all native tables. JSON, YAML, CSV, TSV, agent output, and serialized values are unchanged.