Reference-aware restructuring (xlsx_restructure.py)

scripts/xlsx_restructure.py performs one row/column insert or delete and rewrites everything that references the moved cells. This document gives the exact rewrite rules and honest limits.

What gets rewritten

Artifact	Scope	Behavior
Formula references	ALL sheets	A1 refs into the edited sheet are shifted; refs into a fully deleted region become `#REF!`
Merged-cell ranges	edited sheet	shifted; expanded when they span the insertion point; dropped (reported `to: null`) when fully deleted
Autofilter ref	edited sheet	shifted/expanded like a range
Freeze panes	edited sheet	anchor cell shifted (never below row/col of the pane's own minimum)
Data validations	edited sheet	each range in the sqref shifted; deleted ranges removed
Conditional formats	edited sheet	applied range (sqref) shifted
Native tables	edited sheet	table `ref` shifted/expanded
Defined names	workbook scope	`attr_text` refs into the edited sheet rewritten
Row heights / column widths	edited sheet	dimension keys re-indexed

Reference grammar handled

Relative and absolute coordinates in any mix: B2, $B2, B$2, $B$2 — the $ flags are preserved through the shift.
Ranges B2:D9, including partial-absolute endpoints.
Cross-sheet refs: Data!B2, 'My Sheet'!$A$1:$C$9 (quoted names may contain doubled quotes ''). Only refs whose sheet qualifier matches the edited sheet are touched; unqualified refs are interpreted relative to the formula's own sheet.
String literals inside formulas ("See B2") are never rewritten.
Function names that look like cells (LOG10(...)) are not touched (a reference is never followed by ().
Whole-row/column refs (B:B, 2:2) pass through unchanged — Excel semantics keep them valid across inserts within the span.

Shift semantics

Insert of N at index i: every coordinate >= i moves +N; range endpoints move independently, so a range spanning i grows by N.

Delete of N at index i: coordinates before i are unchanged; coordinates past the deleted block move -N; a single cell inside the block becomes #REF!; a RANGE partially covering the block is clamped (Excel does the same); a range entirely inside the block becomes #REF! (formulas) or is removed (merges/validations).

What it CANNOT shift (honest limits)

Chart anchors and plotted ranges — openpyxl chart objects are not reliably round-tripped; anchors stay where they were. Re-create charts after restructuring if their data moved.
Images / drawings — same reason.
Conditional-format RULE formulas — the applied range (sqref) is shifted, but formulas inside cell_is/expression rules (e.g. $B1>100) are left as-is. Review them if they reference moved cells.
Sheet-local defined names and names using R1C1 or union/ intersection operators are rewritten only if they parse as plain A1 refs; anything else passes through untouched.
Structured table references in formulas (Table1[Sales]) don't need shifting (they follow the table), and are left alone.

Every run prints a JSON report listing exactly which formulas, merges, tables, names, and ranges were changed, plus a fixed not_shifted list of the above limits — inspect it after any structural edit.

One op per invocation

The CLI takes exactly one of --insert-rows/--delete-rows/ --insert-cols/--delete-cols (as IDX[:N]; columns accept letters). For multiple operations run it repeatedly — ordering compound shifts in one pass is where spreadsheet tools historically corrupt references.

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