FABRIC-2.md §I.9 follow-on: blinking | cursor instead of static block

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Captain Bob asked for the framebuffer cursor to render as a blinking
vertical bar rather than the previous static solid-block glyph.

vt100_draw_cursor() (hal/vt100.c) now fills a thin bar (cell_w()/8, min
1px, full cell height) at the cursor's left edge instead of the whole
cell -- an I-beam shape. vt100_erase_cursor() is unchanged (clearing the
whole cell already safely covers the narrower bar).

Blinking is new in repl.c: sk_console_readline()'s idle branch toggles the
cursor on/off every SK_CURSOR_BLINK_INTERVAL (50 ticks, 500ms at 100Hz)
via alternating console_fb_draw_cursor()/console_fb_erase_cursor() calls,
independent of the heartbeat/idle-beat mechanism the §I.9 fix just touched
(deliberately not reused, to avoid recoupling to that path). Runs
regardless of n, so it blinks whether sitting at a bare prompt or paused
mid-edit. Every deterministic draw site (initial prompt, prompt reanchor,
backspace, character echo) now goes through a new helper, sk_cursor_show(),
which resets the blink cycle to "on" and redraws -- typing always shows a
solid cursor, never mid-blink.

Verified via the mandatory foreground 3-arch QEMU acceptance boot: amd64
(logs/20260905-021054, extensive live interactive typing including
multi-line : / ; word definitions and error cases, prompts stayed
correctly attached throughout), aarch64 (logs/20260905-021551), riscv64
(logs/20260905-022324) -- all three reached (zuse) ok> and shut down
cleanly via BYE.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_019YcT3H2PQeyujrzjqS3Var

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This commit is contained in:

Robert Allan James

2026-09-05 02:24:51 -04:00

co-authored by Claude Sonnet 5

parent 8edb95b65d

commit 70dc8beba4

11 changed files with 27059 additions and 15 deletions

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logs/20260905-021054/amd64/qemu-amd64-20260905-021054.log

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logs/20260905-021551/aarch64/qemu-aarch64-20260905-021551.log

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logs/20260905-022324/riscv64/qemu-riscv64-20260905-022324.log

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