Module pager 

Output pager for displaying large result sets.

Two modes:

• Batch (page_content): write all content to temp file, open with pager.
• Streaming (page_stream): pipe rows directly to less stdin. less stores received bytes in its own internal buffer and allows full backward scrolling. Data appears as it arrives; no polling required.

Pager resolution order:

1. $PAGER environment variable (pipe mode — custom pager gets stdin)
2. less with stdin pipe (less -R -S)
3. more as fallback (pipe mode)
4. Error if nothing available

Structs

PagerWriter

A writable handle that streams rows to a pager.

Functions

page_content

page_stream

Spawn a pager for streaming output, returning a PagerWriter to write rows into.