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Dragging a selection beyond the top or bottom of a pane stopped at the last visible row. Now, while B1 is held past the body's top or bottom (at a pane that reaches the screen's bottom, its last row, since the pointer cannot leave the screen), the body scrolls a line a tick; the sweep's start keeps its place in the text, and a sweep that scrolled ends as the text's own selection. Also here: a ctrl-click is not half a double-click (lspdebug's golden stays as it was), and a test that clicks many points in a row resets the double-click between them.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
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B1-B2 then B1-B3 cut and pasted as two undo steps. acme marks the file once per B1 hold (text.c:881, textselect), so the pair is a copy. The chord now takes one undo point when it begins and its edits share it until B1 comes up.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
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text
A second B1 click at the same cell selected nothing more. Now, as acme's textdoubleclick (plan9port text.c:1407), it selects up to the match of a bracket just before or after the point, the whole line at a line's start or end, the quoted text inside ' " `, or else the word, in bodies, tags and terminals in normal mode. A plain click still puts the caret on its cell.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
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acme gives a column tag one font height (cols.c:244) and its row tag one line; pardes let them grow a row per line. A newline typed, pasted, written or restored into a column or workspace tag now becomes a space, the caret and selection kept on the same characters, and the bars are one row each. A dump holding a multi-line header tag comes back with its lines joined by spaces.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
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A B1, B2 or B3 drag over several lines took the same columns from every row, a block. acme's sweep is a stream (libframe/frselect.c:115-140, frselectpaint; acme text.c:881, textselect): the first row from the press to its end, the rows between whole, the last from its start to the release. edit.sweepCols says which columns of a row a sweep takes; the captured spans, the text a sweep yields (copy, chords, B2 and B3 operands, a terminal's automatic yank) and the highlight all follow it, in bodies, multi-row tags, terminals and text-rendered PDFs; a row the sweep runs through is highlighted to the edge, and rows after the first leave out the line numbers. Native PDF selection was already MuPDF's stream. No pane keeps a rectangle. exec-bigdrag's golden changes: its middle sweep now runs whole lines.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
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one undo step
Over 9P a rename everywhere was a loop of addr and data writes. Edit, from a tag, a pane ctl or exec, parses sam's commands as acme's edit.c does and runs them as ecmd.c does against the text as it was, collecting the changes in order as elog.c logs them and applying them at once: addresses (the addr file's, line:col included), x y g v c a i d s p = m t, u alone, and { }. One undo step; any error, in acme's words, changes nothing, fails a ctl write and is logged. p and = print to the directory's +Errors. Left out, and said: the file commands, the pipes, \1-\9 (mvzr keeps no submatches), and changes out of sequence, which acme applies with a warning.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
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pardes leaves none behind; tests remove their /tmp dirs
Every pardes host wrote its own pardes-osc133-bash-* and -fish-* files to /tmp and removed them only at a clean teardown, so each killed session, test and crash left two: 72K of them had piled up. They are now written once per content, named by its hash, in the user's private runtime directory, renamed into place whole and shared by every pardes; without that directory the old private /tmp files remain. fish's -C source is quoted. The 9p_io tests remove their runtime dirs with what the listener left in them, and the snapshot runner removes its retry captures when every retry passed.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
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dirty compared revisions only, so undoing to the save point, or typing the text back, left the pane dirty. The saved text's hash is kept from the first edit after a save or load, and an edit that makes the text equal to it marks the pane saved again, as undo to the save point does in acme.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
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being reset
Four slots ran out under scripts plus a mount, and the fifth client was closed without a word, which through a mount looks exactly like a dead session. pardes now serves sixteen, and builds against cloud9 09b77cf, whose runner answers the Tversion of a client it cannot seat with an Rerror "too many connections" and tells pardes, which logs `err - 9p: too many connections`. QUIC keeps its own sixteen and still just closes.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
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nothing
A look at `file:/re/` or `:/re/` searched for the words instead of addressing, and a miss left an empty +Search pane and a cleared selection, while a hit answered the +Search pane on /look. Now an address after a colon (acme look.c:450) is evaluated in the file from its dot; a miss says no match and leaves the panes and the selection alone; a hit reads back as the pane the text is selected in. Both live in lookAt's one flow, so they are one change.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
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names the path and why
The write answered ok and the pane stayed dirty, with `save: AccessDenied` on its message row: a script saw success. The failure now says `Save <path>: <why>`, and a 9P write that waited on the save fails with EIO and that text, logged as an err record.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
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step its body
Over 9P there was no way to take back an edit: acme's Undo and Redo were keys only. They are now pane builtins, reached from a tag, a pane ctl and exec, and listed in /commands. They are not added to the default tags, which would change every tag.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
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The user tried them live and wants them removed entirely: the builtins,
their levels, config keys and leader paths (tR, tg), their slots in the
built-in chain, their shaders (source and prebuilt), EffectCode paths, and
on macOS their scene flags (pardes.h), the Metal kernel's coordinate warps
and the Swift pointer mapping that mirrored them. Docs say so (decision 8
in docs/render-pipeline.md); config.md documents Crt's levels, Shader and
ShaderAnimation instead.
Shared files touched: macos.zig (flags). Not touched: pardes.zig,
Messages.zig, mouse.zig, gui.zig, detached/*.
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Coordinator's request: `Crt 0..3` (likewise Ripple, Glitch), 0 off, `on`
the default level 2 (the polished rewrite), `off` and a bare word as
before. The level is one uniform (pardesLevel, beside pardesOpaque in the
prefix's own block); each pass picks its constants by it. Level 3 is at
least as strong as the old effects, measured as pixels changed by more
than 8 in a channel against a plain frame: Crt 18.3% (old 17.4%), Ripple
11.1% (9.5%), Glitch 9.3% a frame (8.1%); Glitch's level raises how often
it bursts as well as how hard. Config and ctl report `Crt 2` / `Crt off`.
Shared files touched: ninep/ctl.zig (the report line). Not touched:
pardes.zig, Messages.zig, mouse.zig, gui.zig, detached/*.
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Stage 8 of docs/render-pipeline.md. The frame is drawn in groups: tier 0,
one per track in paint order (tiers 2 and 3), tier 4 (notices, then guides
and the debug box), tier 5 (bar cursors), each cells, images, decor. Decor
(rules, rails, thumbs, grip marks, spines, the workspace and column rules,
the bottom band, notice rules, bar cursors) is whole-pixel rects through
the new decor.frag over ui.vert, so it carries its track's transition and
clip. A closing pane's chrome comes from Surface.previous_regions.
Deleted: taglineBaseRgb, topbarPaneBorderHeight, bottomTaglinePresent,
frameChromeBg, cellBackgroundIs and the rail inference, paneGripCell's
scan, transient_on, PaintPlan. One cover map (coverFrame) is marked from
the layers and regions once a frame. New regions column, guide and debug;
Surface.chrome is the palette, carried in wire v8 (not shipped yet), so an
attached GUI draws the same chrome (test). A per-instance clip replaces the
vertical transition's scissor.
Goldens: 01-12 byte-identical. 13-17 differ only past the grid: the image
pass left its scissor at the grid's size, cutting rule ends, rail feet and
the bottom band in the leftover pixels whenever a picture was on screen.
16-debug now shows the debug box, which a context-row layer had hidden.
18-mid-transition is new: virtual clock (PARDES_TEST_CLOCK in the GUI),
PanelSlide Newcol with the picture, frame 6 of 12.
Also: the GUI sleeps when idle instead of polling every 16 ms, and a
minimized or occluded window sleeps through animation. Tracy 'gui frame
build' at 200x60: 992/1015 us median before, 989/987 us after.
Shared files touched: pardes.zig (one export), detached/client.zig,
detached/server.zig, detached/wire.zig (all additive), gui.zig. Not touched:
Messages.zig, mouse.zig, tagline.zig, colors.zig, tty.zig, host_io.zig,
dump.zig, exec.zig, panes.zig.
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of rows; wire v8
src/Layer.zig merges TagLayer and BodyLayer. `rows` (0 = no layer) and a
cursor at {x, y}. A tag of N rows is ONE layer of N grid rows: tagHit answers
the row as `line`, bodyHit keeps its meaning, and the per-line layer bases
(TAG_LINE_LAYER_BASE, HEADER_LINE_LAYER_BASE) are gone, not aliased.
Wire v8, the one bump: tag layers carry rows and cursor y, and the frame
carries the placed region list. v7 and v9 peers are refused in both
directions (server test over both, a new frontend test over both).
web: tag_layer_value 11 = rows, 12 = cursor y; app.mjs lays every row.
macOS: the Zig side compiles against Layer; pardes.h still sees one row
per tag layer (accepted, the macOS shell is ignored for now).
No visual change: snapshot goldens and the 17 GUI goldens byte-identical.
Shared files touched: pardes.zig, Messages.zig, gui.zig, macos.zig,
detached/client.zig, detached/server.zig, detached/wire.zig (plus web.zig,
app.mjs, edit.zig, look.zig). Not touched: mouse.zig, tagline.zig,
colors.zig, tty.zig, dump.zig, exec.zig, host_io.zig, panes.zig.
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joinBody replaces the second paint of a file body with compact tree-sitter
context rows: the body is painted once into its body layer (more rows than
the grid has) and the grid's body rows are copies of the layer's first
ones; the rail is the grid's alone, from its region. Which rows are context
rows is still decided by a text build before the paint, and a body without
them reuses that text and paints straight onto the grid: every other body
has no row the grid cannot show, so it gets no layer and no copy.
Each part now paints only its own rows. The tag paints the tag rows of
every pointer sweep that crosses them (the select sweep in the tag's
colours, the look-hover affordance over it, a middle or right sweep over
both in its button's tint), which the body used to paint over the tag on
the grid alone; the body paints only body rows, and a select sweep begun on
the tag marks the body rows it crossed before the text is laid down, as it
did. Grid and layers agree, the snapshot goldens are byte-identical, and a
test checks the joined grid rows and caret against a plain paint of the
same body with the tag on top and at the bottom. The GUI goldens gain a
terminal pane scene.
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A shell now answers Host.now, its monotonic clock in ns, and the pump
advances core animation to it: one .tick per whole 16 ms frame since core
time last stood still. The same animation therefore takes the same time at
60, 120 and 144 Hz, over ssh and after a slow frame (the GUI's re-armed
clock ran them ~25% slow at 144 Hz; the tty's post-frame sleep drifted).
nextWake() lists every core animation in one place: a frame from now while
anything moves, the end of the wait while something only waits (a message
lingering, the look-hover delay), null when idle. Shells sleep exactly that
long, and a wait is jumped to its end in one step, so an 800 ms linger
costs one frame instead of fifty. An overshoot under 1.5 ms after a step is
let go: at 60 and 120 Hz every display frame takes exactly one step (a 16 ms
frame against a 16.67 ms vsync would otherwise double-step every 24th).
The six tick drivers are gone: tty's timer thread only times the wait,
interruptibly (a newer, shorter request cuts short a sleep still timing a
longer one); the GUI's
AnimationClock, web's JS tick bank (pardes_tick now takes rAF's timestamp),
the detached server's and the board's ticks; grid mode steps a virtual
clock straight to each wake. PARDES_TEST_CLOCK, set by the snapshot
harness, gives tty and the detached server the same virtual clock.
Every stepped frame is drawn. The old pump never drew the last frame of a
fade (a .tick asks for no frame, and the fade was over by the check), so a
theme switch stopped at 9/10 of the way until the next input: theme.golden,
themesel.golden and the GUI's acme-light scene move to the theme's true
colours, and nothing else changes. The frozen previous grid is captured only
while a panel transition is chosen, not on every idle frame.
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Pure moves, no behaviour change. draw.zig holds the whole core frame in
order: render, the pane, tag, header and notice painters it calls, and the
character-effect composition (Pardes.render stays a declaration alias).
Presentation.zig is the panel presentation state as a file struct, and
animation.zig the easing curves, transition kinds, tracks and boxes, the
character effects' sources and the generic displayed-value transition, all
of which lived in layout.zig. layout.zig keeps only layout.
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test/gui_golden.py drives a hidden pardes-gui through 9P and window-pixel
mouse events on its test stdin into sixteen scenes: documents, a notice,
sticky context rows with the scroll thumb mid-rail, a body selection, a tag
holding the keyboard with a selection and caret, a prompt notice, wide
glyphs across a tag's and a body row's right edge, a collapsed pane with
focus tint, Tagbottom, column tags, a multi-line tag, an image, a dark and a
light theme, and Debug. Each scene waits until two captures agree and is
hashed. The goldens are machine- and driver-specific: a local gate, never a
CI one.
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freed at one
The ranges beside the primary were an inline array in every Text, which at
1024 grew each pane by about 60 KiB. They are now allocated when a second
range appears (Text.reserveSels) and given back when the selection is one
range again (Text.dropSels); a column's or the workspace's tag allocates from
Text.gpa, any other text from its pane's. A refused tag edit restores them by
copy. The Pane size budget is back to 128 KiB, and a test holds that a single
cursor allocates nothing for them.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
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helix goto_word: the words of two or more word characters between the
view's first and last lines get two-letter labels, nearest the cursor first,
one forward and one back in turn (modal.jumpWords). The next two keys choose
one and select it, stretching the selection to it in select mode; any other
key takes the labels away. The words live on Pane.jump, and renderBody paints
their labels over the body's cells in the selection colours, the one change
on the render side.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
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Z is helix's sticky view mode: the z keys stay armed after each until Esc,
which leaves the mode and does nothing else (no pane hop). zm is
align_view_middle: an unwrapped view scrolls sideways so the cursor's column
is in its middle.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
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helix smart_tab: in insert mode, Tab where text precedes the cursor on its
line moves past the end of the node the cursor is in, the parent-node end of
Alt-e; in leading blanks it indents. Only where the file has a grammar: the
reference pins smart tab off, which a file without a grammar agrees with, so
there Tab still indents. Shift-Tab is insert_tab, and the differential
harness now reads the S- modifier.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
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helix commit_undo_checkpoint: u after the insert session goes back to the
text as it was at Ctrl-s, a second u to before the session. It pushes an
undo snapshot where the session stands.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
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helix's earlier/later walk its history tree by time; pardes's history is a
line, where earlier and later are undo and redo, so the keys are aliases.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
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helix goto_last_modification: every range moves to the end of the last
change (the start of a deletion, the end of an insertion), extending in
select mode. The position is kept on the Text in surface rows, set where
setEditText hands a body its new text, so a terminal's typed text has one
too and moves with its scrollback.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
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helix's expand/shrink, previous/next sibling, all siblings, all children and
parent-node end/start (Alt-o/up, Alt-i/down, Alt-p/left, Alt-right, Alt-a,
Alt-I, Alt-e, Alt-b; Alt-n stays the new terminal) walk a whole-file parse
the file keeps (File.node_tree), made on the first such key after an edit and
reused until the next, never per key. syntax.walkNodes follows helix's
TreeCursor over every node, anonymous ones included, and Alt-i goes back to
what Alt-o grew from while the selection still holds it. The harness runs
without grammars, so the cases prove the plain-text no-op; a test replays
eleven JSON walks whose results were taken from the installed hx.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
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range forward
K and Alt-K share the s/S prompt, which now carries a mode rather than a
split flag: a range stays when a match starts inside it (K) or when none does
(Alt-K), the primary becomes the first, and keeping none leaves the selection
as it was (helix keep_or_remove_matches). Alt-: is ensure_selections_forward.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
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The limit was 64 everywhere, which helix-golf's enumerate_and_align outgrows
(%s |\d+ makes 121 ranges). It is now memory.limits.selections, per platform,
and the counts that hold it are u16. The ranges stay inline in each Text, so a
pane grows by about 80 KiB on the desktop (three texts and the regex prompt's
snapshot); the Pane size budget in Terminal.zig moves from 128 to 160 KiB and
says why.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
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Macro.zig keeps keys to be typed again. Q records into @ (or "<reg>) in
helix's key notation until the next Q; q replays a register's keys count
times through the modal handling, where Esc does not hop panes and Enter,
Tab and Space neither look, execute nor open the leader. . replays the
normal command that entered the last insert session once and what was typed
in it count times (helix repeat_last_insert). a at the end of the text now
adds the newline helix's append_mode does, which a terminal's text does not.
helix-golf's invert_dictionary passes.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
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$ was a second key for line end, which helix never meant: in helix it is
shell_keep_pipe. It now arms the pipe prompt with a $ marker, runs the
command once per range with that range's text on stdin, and keeps the ranges
it exits 0 on; the primary stays if kept, else the last kept range takes
over, and keeping none changes nothing. The runner's answer is all or
nothing, so the command runs in a subshell whose status is echoed as its
output. Line end stays on helix's own gl and End; the snapshots, tutor and
docs that pressed $ for it press gl.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
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read it whole
setEditText freed the text a tag edit was handed once it had copied the
tag's own part out of it, but every caller reads that text back to place the
cursor, and surround goes on to edit it again: ms and md in a tag read freed
memory. The same held for a terminal without an edit buffer and a text with
no pane. The text is now kept until the next such edit (edit.retireEditText),
which covers every caller at once; the callers the audit found reading it
back are surround's two, the paste and replace paths, the number adjust, and
the insert-mode Enter.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
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reverse_golf_example from ""N on needs *, N and n to walk the search
register; in pardes those keys are the acme look ring, by decision. The seven
steps are pinned in golf-waivers.jsonl, so a new mismatch stands out.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
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Insert mode dropped the selection on the first key and restored only the
primary's appended-over span on Esc. Now each insert-mode edit is made at the
bare cursor as before, and the range is then carried through it with helix's
Range::map rules: typing slides an i range and stretches an a range, Enter
(which now also drops the blanks before the cursor, as helix does) slides or
stretches by what the cursor moved, and an arrow collapses. The replay gives
every other range the same. Esc after a pulls each range's end back by one
(helix restore_cursor), which replaces Text.append_at. The wiX-edit-drops-sel
and msel-append waivers are gone.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
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Registers.zig replaces the one yank buffer: every register keeps a value per
range, y fills them in document order, and p, P, R and insert Ctrl-r put
value i at range i, repeating the last (helix paste_impl). "<reg> names the
register for the next command; _ swallows, # numbers the ranges, . is each
range's text, % the file's name, / the last s/S pattern, and + and * are the
system clipboard through the ClipYank and ClipPaste paths. SPC y now writes
+ alone, as helix's does. The acme chords and a paste into a terminal take
the default register joined by newlines. The msel-yank-paste waiver is gone.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
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s and S search each line as its own haystack, so ^ and $ hold at every line
and . never takes a newline, which is helix's multi_line regex. The waivers
for the old difference, sel-regex-caret and sel-regex-dot-newline, had gone
stale, and --strict stopped on the first before printing its summary.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
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helix-golf's enumerate_and_align ends on %s |\d+<ret>&. align_selections
treats the k-th range of each line as column k and puts spaces before each
range until its head reaches the widest head of its column, measured in
display cells, which File.rawDisplayCol already gives. A range over several
lines refuses, as in helix. The example itself still needs more than 64
ranges, which the selection model does not hold.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
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helix's delete_char_backward dedents: when everything before the cursor on its
line is blank, it deletes back to the previous multiple of the indent width,
a whole unit when already on one (a tab before the cursor still goes alone).
pardes deleted one space, so O<backspace> under an indented line left three
of four, which is where helix-golf's function_into_class ended up.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
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helix-golf swaps keys and values with rotate_selection_contents (webS_to_
<ret><A-(>, then per line). Each range's text moves to the next range (the
previous one for Alt-(), in one edit; a count rotates by that many ranges,
each range comes back over the text it now holds in its own direction, and
the primary follows its text. That is the harness's helix; 25.07.1 read the
count as a group size and left the primary alone.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
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helix-golf's text_into_array turns lines into an array with %<A-s>ms"<A-J>i,:
join_selections_space joins like J and leaves one cursor on each space it
inserted. J and Alt-J now make one edit over every range, as helix does,
rather than J being replayed per range; that is what lets Alt-J hand back
all the spaces as the new selection.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
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[<space> and ]<space> measured from the cursor's line, so over a selection of
several lines whose head was at the bottom, [<space> opened a line INSIDE the
selection. helix takes the range's line_range: above its start, below its end.
helix-golf's export_from_mod (yp[<space>) is where it showed.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
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R always left the head on the pasted text's last char. helix maps the
replaced range through the change, so a backward selection comes back
backward, its head on the first char: helix-golf's reverse_golf_example
(xbR) is where it showed. SPC R shares the path.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
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ms<ch> always left the wrapped range pointing forward. helix gives each range
back with_direction(range.direction()), so a selection made backward (b, or v
moving up) keeps its head on the open, which is where the next motion starts
from. helix-golf's csv_to_sql (bms`) is where it showed.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
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The ten examples on helix-golf are imported as 118 cases: each numbered step
of an example's walkthrough is the case whose keys are the command up to and
including that step, so the first mismatch names the step where pardes and
helix part. Six more restart at a step that begins with %, from helix's own
text there, so a later step is tested even when an earlier one misses.
zig build hxgolf compares all 124 with goldens from hx-harness.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
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A failure read `Del k|j: InvalidArgument`, `Kill: NoSuchCommand`, `ill-formed control message`, or nothing at all. reportError now spells an error's name as words, and the refusals name their accepted forms: pty/ctl lists its verbs, a flag file takes 1 or 0, a setting word takes on or off, Del takes k, j or nothing, Repl takes - or a language. Kill with nothing to stop says so, /focus says pane, a Look that found nothing says no match, and pty/run on a command pane says it is not a shell. A ctl write's failure has room for the Repl list and is cut between words, the Repl word at a character.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
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one focused before
Dogfood closed a pane in one column and focus jumped to another column, only because that pane was focused last. Now removePane decides for every route (Del, a ctl del, a command pane's end, a 9P remove, a stillborn scratch replaced): the pane that grew into the rows, or the scratch standing in an emptied column; removeColumn gives it to the pane level with it in the column that takes the width. Closing an unfocused pane leaves focus alone. The per-caller focus lines in Del and replaceStillborn are gone, and so is prevFocus.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
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The signals' default action ended the process where it stood, leaving
pardes-9p-*.sock and pardes-detached-*.sock for the next session to trip on.
The detached session now takes them to mean quit: the handler sets a flag and
wakes the loop, which leaves as Exit does, through the teardown that unlinks
both. fs.py sends each of the three and checks the sockets are gone.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
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Tty /nonexistent or Tty fsh started the host's fallback shell without a word,
and when spawnTty made no pane, the argument became the calling pane's shell.
Tty now looks the shell up first and fails 'Tty: no shell "fsh"' when it is
neither a name on the usual paths nor a path to one; spawnTty answers the pane
it made, the one given the shell, and says why when it made none. The lookup
(host_io Shell.find) gives the turn up around its access() calls, since a
typed path may be under a mount this editor serves, and forkShell copies the
pane's shell before looking it up and checks the pane is still its own after.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
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