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Implement the shell experience redesign: one canonical grammar for every
command — 'cmd args [USE src] [TIL marker] [filters...] [output kw dst]'.
- Keyword redirection (uppercase-only, aliases valid, fully reserved):
WRITING/WRITE overwrite, TO append, USE/USING input source,
TIL/UNTIL heredoc/terminator (exact full-line marker). > >> < << are
removed; '>' is plain text.
- Post-filter stages applied left to right over a line stream, each
repeatable: -h N (head kills the upstream), -t N (tail holds a
rolling window, flushes at EOF/^C), -g PAT (smart-case literal
substring), -p (screenful pager, terminal only). A file sink
replaces the screen; -p is a no-op with one.
- C-style quoting: "..." groups and literalizes, \x escapes one char;
quoted/escaped text is never an operator, never split.
- Input consumers: cat/hexdump, path-less only (stdin until ^D,
USE f, TIL m heredoc, USE f TIL m truncation). Other commands
reject input keywords; paths + input keyword is a syntax error.
- ^D is EOF everywhere and never powers off; poweroff/exit are the
only shutdown verbs.
- help rewritten; test-disk.sh and sendkeys.py use the keyword syntax.
Verified in QEMU: 26 grammar checks on fresh and reused disks, disk
round trip, pager pacing, -h stopping /dev/mem at N lines, ^C flushing
a -t window. Two bugs found during verification and fixed:
1. WRITING over an existing file wrote after stale NUL padding —
fs::size() is stale after set_len(0); the sink writes at offset 0
after truncation.
2. USE f TIL m leaked the post-marker remainder — the final
partial-line emit ran after the marker break; guarded with a
stopped flag.
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- scripts/mkdisk.sh: create the FAT32 disk with mkfs.fat -C (the flag
that actually creates the file — plain mkfs.fat fails on a missing
path), accept M/G/K sizes, seed seed/ files via mtools; --fresh
re-formats, --no-seed skips seeding
- scripts/sendkeys.py: type lines into the guest via the QEMU monitor
(US layout). Punctuation must use QEMU's named keys (minus, slash,
dot, ...) — bare '-', '.', '/' are not valid sendkey names, and '-'
is the modifier separator, so they were silently dropped before
- scripts/test-disk.sh: full automated round trip — build, deploy,
ensure image, boot headless QEMU, drive the shell (ls /disk, mkdir,
echo >, cat, poweroff), then verify with fsck.fat (must be clean)
and mtype (file content must have survived poweroff)
- Makefile: make disk / disk-fresh / inspect / test-disk; run, run-gui
and debug now auto-create a missing DISK_IMG; fix the stale comment
(mkfs.fat without -C)
- scripts/boot.sh: auto-create a missing DISK_IMG via mkdisk.sh
- seed/: motd.txt + lines.txt seeded onto fresh images
- Verified end to end: ./scripts/test-disk.sh --fresh passes
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