more: gate tty-only writes; extract clear_line/highlight_text#12224
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Pager unconditionally wrote ANSI sequences (Attribute::Reverse, Clear, MoveTo) even when stdout was not a tty, leaking escape codes into pipes. Gate each on stdout.is_tty() through two helpers and apply them at every call site: error prompts, multi-file header, screen update, line clear, pattern highlight, and the status bar.
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May 28, 2026
…#12224) Pager unconditionally wrote ANSI sequences (Attribute::Reverse, Clear, MoveTo) even when stdout was not a tty, leaking escape codes into pipes. Gate each on stdout.is_tty() through two helpers and apply them at every call site: error prompts, multi-file header, screen update, line clear, pattern highlight, and the status bar.
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Motivation
Pagerwrote ANSI escape sequences (Attribute::Reverse,Clear(...),MoveTo(...)) unconditionally. When stdout is not a tty — e.g.more file.txt | cator any redirect — those bytes leak into the downstream consumer as garbage.Changes
Two small helpers on
Pager, each a no-op when stdout is not a tty:clear_line()— queuesClear(CurrentLine).highlight_text(text)— wrapstextinReverse…Reset.Applied at every site that wrote raw ANSI:
handle_from_line— "cannot seek to line" error prompthandle_pattern_search— "pattern not found" promptdisplay_multi_file_header— line clear before headerupdate_display— gateprint_over/clean_printcursor moves onis_tty()draw_lines— line clear at top, pattern highlight in bodydraw_status_bar— reverse-video status bardraw_status_barnow returnsio::Result<()>instead of.unwrap()-ing its write.Carved out from #10667 per the request to split.