Version 0.7.0: Kantonstarife 2026 (taxCH_AI/AR/SG/GR)

column -d: Spalten löschen
demo: Reste von splittable (colorsaa-ac) entfernt
2026-10-12 00:27:06 +02:00 · 2026-10-12 00:10:36 +02:00 · 2026-10-11 23:58:58 +02:00 · 2026-10-11 23:56:05 +02:00 · 2026-10-11 23:32:07 +02:00 · 2026-10-11 23:23:37 +02:00
24 changed files with 1242 additions and 18 deletions
@@ -7,6 +7,33 @@ folgen [Semantic Versioning](https://semver.org/lang/de/). Die Version steht in

 ## [Unveröffentlicht]

+## [0.7.0] - 2026-10-12
+
+### Hinzugefügt
+- `column -d Spalte ...` (und `project -d`) löscht Spalten: alle anderen bleiben in ihrer Reihenfolge. Fehler bei unbekannter Spalte oder wenn alle gelöscht würden. Dazu Abschnitt in `man/column.man`, Beispiel in `testall.cmds` und Tests.
+- Kantonstarife 2026 für `tax`: `demo/taxCH_AI2026`, `taxCH_AR2026`, `taxCH_SG2026`, `taxCH_GR2026` (Präfix `taxCH_` für die Schweiz; einfache Staatssteuer für Alleinstehende, vor Steuerfuss, Gemeinde und Kirche), erzeugt mit `tools/gen_tax_tables.rb`. Mit Tests, Beispiel in `testall.cmds` und Erklärung zum Steuerfuss im README.
+
+### Behoben
+- `rdb man dashline` (und `headline`, `backup`, `dbase`, `accounting_ter`) zeigte als Überschrift eine Makrozeile (`dashline -- .PP`). Themen-Seiten ohne Beschreibung nehmen jetzt den Titel aus der `.TH`-Zeile.
+- `splittable -0` und mehr als 676 Stücke endeten mit einem Ruby-Abbruch (im zweiten Fall nach 676 geschriebenen Dateien). Jetzt eine Fehlermeldung, und es wird vorher geprüft, damit nichts halb geschrieben wird.
+
+## [0.6.0] - 2026-10-11
+
+### Hinzugefügt
+- Steuertabellen 2026 für `tax`: `demo/taxDE2026`, `taxAT2026`, `taxCH2026` (nur Bundessteuer), `taxLI2026` (nur Landessteuer), erzeugt mit `tools/gen_tax_tables.rb`, mit Tests.
+
+### Geändert
+- `record`: 0 und 1 sind die erste Zeile, negative Zahlen zählen vom Ende (`-1` letzte, `-2` vorletzte ...). Außerhalb der Tabelle kommt eine leere Tabelle, Text und Dezimalzahlen sind ein Fehler. (Vorher lieferten 0, -1 und Text ungewollt Zeilen vom Ende.) `testall.cmds` und `man/record.man` zeigen es.
+- README und `man/row.man` erklären, warum `select` in bash/zsh/ksh einen Syntaxfehler gibt und wie man es trotzdem aufruft.
+
+### Behoben
+- `rdb man` zeigte `\\select` in den Man-Pages als `\elect`: ein doppelter Backslash wird jetzt zuerst geschützt.
+
+## [0.5.0] - 2026-10-11
+
+### Hinzugefügt
+- `pick`: Tabelle auf dem Terminal durchblättern, filtern und eine oder mehrere Zeilen (`-m`) auswählen; die Auswahl geht als Tabelle auf die Standardausgabe. `-k` nimmt die Tasten aus einem String. Dazu `man/pick.man`, Beispiele in `testall.cmds` und Tests (auch mit Pseudo-Terminal).
+
 ## [0.4.0] - 2026-10-11

 ### Hinzugefügt
@@ -40,6 +40,8 @@ Dasselbe gilt für **Listen** (ein Datensatz als `Spalte<Tab>Wert`-Zeilen, die
 Datei beginnt mit einer Leerzeile). `tabletolist` und `listtotable` wandeln um,
 die meisten Befehle lesen beides.

+`column -d Spalte ...` löscht Spalten (alle anderen bleiben), `column Spalte ...` wählt sie aus.
+
 `row`, `compute` und `validate` übergeben ihren Ausdruck an awk, nachdem sie
 Spaltennamen durch `$N` ersetzt haben. Es gilt also awk-Syntax.

@@ -102,6 +104,63 @@ In der Vorlage: `<Spalte>` oder `<Spalte:20>` ist ein Feld (mit Breite), `[ Spei
 `[ Abbrechen ]` (oder Cancel, Abort, Quit) bricht ab, `<!date!>` fügt Befehlsausgabe ein. Kommt eine Spalte mehrfach
 vor, ist es ein Feld. Tab/Pfeile wechseln, Enter bestätigt, Esc bricht ab (Status 1, keine Ausgabe).

+## Zeilen auswählen: `pick`
+
+`pick` zeigt eine Tabelle auf dem Terminal, man scrollt, filtert und wählt eine oder mehrere Zeilen. Die Tabelle
+kommt von der Standardeingabe, die gewählten Zeilen gehen als Tabelle auf die Standardausgabe, also mitten in der Pipe:
+
+```
+pick < inventory                                  eine Zeile wählen
+pick -m < inventory | total Amount Value          mehrere (Leertaste markiert, a alle)
+column Item Description < inventory | pick -m | jointable - owners
+pick -m -k 'down space down enter' < inventory    Tasten aus einem String (Skripte, Tests)
+```
+
+Pfeile, Bild auf/ab, Pos1/Ende scrollen; `/` filtert (Enter behält den Filter, Esc löscht ihn); Enter wählt;
+Esc bricht ab (Status 1, keine Ausgabe). Ohne Markierung gilt die Zeile unter dem Cursor.
+
+## Steuertabellen 2026 für `tax`
+
+`demo/` enthält vier Tarife für das Steuerjahr 2026 im Format von `tax` (income, tax, percent), jeweils für
+Alleinstehende (Grundtarif). Erzeugt mit `ruby tools/gen_tax_tables.rb`.
+
+| Datei | Land | Quelle | Genauigkeit |
+|---|---|---|---|
+| `taxDE2026` | Deutschland, Einkommensteuer | § 32a EStG (Grundfreibetrag 12 348 €) | Kurvenstücke durch Geraden genähert, Abweichung unter 0,15 € (die Formel rundet ab, `tax` auf) |
+| `taxAT2026` | Österreich, Einkommensteuer | § 33 EStG (0 % bis 13 539 €, dann 20/30/40/48/50/55 %) | exakt, vor Absetzbeträgen |
+| `taxCH2026` | Schweiz, **nur direkte Bundessteuer** | Art. 36 DBG, ESTV-Rundschreiben 2-215-D-2025 | Stufen exakt, das Gesetz rechnet in 100-Franken-Schritten |
+| `taxLI2026` | Liechtenstein, **nur Landessteuer** | Art. 19 SteG (LR 640.0, Fassung 01.07.2026) | exakt |
+| `taxCH_AI2026` | Kanton Appenzell I.Rh., einfache Staatssteuer | Art. 38 StG (ESTV-Kantonsblatt) | exakt |
+| `taxCH_AR2026` | Kanton Appenzell A.Rh., einfache Staatssteuer (Alleinstehendentarif) | Art. 39 StG, Beträge ab 2024 | exakt |
+| `taxCH_SG2026` | Kanton St. Gallen, einfache Staatssteuer | Art. 50 StG, Beträge ab 2026 | exakt |
+| `taxCH_GR2026` | Kanton Graubünden, einfache Kantonssteuer | Art. 39 StG, indexierte Beträge ab 2025 | exakt |
+
+```
+tax 60000 < demo/taxDE2026         14233
+tax 60000 < demo/taxAT2026         15447
+tax 60000 < demo/taxCH2026           671
+tax 60000 < demo/taxLI2026          1396   (mal 1 + Gemeindezuschlag, 150 % bis 250 %)
+```
+
+Der Betrag ist die Steuer auf das **zu versteuernde** Einkommen. Abzüge, Sozialversicherung, Absetzbeträge,
+Kirchensteuer und Soli sind nicht enthalten. Für die Schweiz kommen Kanton und Gemeinde dazu (sie sind meist
+höher als der Bund), für Liechtenstein der Gemeindezuschlag: gesamt = Landessteuer × (1 + Zuschlag/100).
+Ehepaar- und Alleinerziehendentarife fehlen. Das ist keine Steuerberatung.
+
+**Kantone (AI, AR, SG, GR):** Die Dateien tragen den Präfix `taxCH_` (Schweiz) vor dem Kantonskürzel; `taxCH2026` ist die Bundessteuer. Die Tabellen geben die *einfache Steuer* wieder. Sie wird mit dem Steuerfuss multipliziert,
+und Gemeinde und Kirche kommen dazu. Der Kanton setzt den Steuerfuss pro Jahr fest:
+
+| Kanton | Steuerfuss Kanton 2026 | Quelle |
+|---|---|---|
+| AI | 96 % | Kantonsblatt AI (Grossratsbeschluss 1.12.2025) |
+| SG | 105 % | Budgetbeschluss des Kantonsrats (Websuche, nicht im Kantonsblatt) |
+| GR | 92 % | Grosser Rat, Budget 2026 (Websuche) |
+| AR | nicht ermittelt | AR rechnet in Steuereinheiten, die Zahl für 2026 habe ich nicht gefunden |
+
+Beispiel AI bei 60 000: `tax 60000 < demo/taxCH_AI2026` = 3770, mal 0,96 = 3619 (Kantonssteuer, ohne Bezirk, Gemeinde und Kirche).
+Oberhalb einer Grenze gilt bei allen vier Kantonen ein fester Satz auf das *ganze* Einkommen (AI ab 200 000 mit 8 %,
+AR ab 260 800 mit 2,6 %, SG ab 264 500 mit 8,5 %, GR ab 780 440 mit 11 %); in der Tabelle ist das die letzte Zeile.
+
 ## Befehle

 | Gruppe | Befehle |
@@ -116,7 +175,7 @@ vor, ist es ein Feld. Tab/Pfeile wechseln, Enter bestätigt, Esc bricht ab (Stat
 | Text | `cap` `uppercase` `lowercase` `substitute` `trimblank` `padstring` `length` `filesize` `ascii` `chr` `word` `prompt` `not` `path` |
 | Umwandeln | `tabletolist` `listtotable` `listtosh` `tabletofix` `fixtotable` `tabletostruct` `tabletotbl` `tabletofact` `tabletorule` `tabletom4` `tabletosed` `translate` `uniondict` |
 | Datum, Namen | `julian` `gregorian` `computedate` `todaysdate` `soundex` `like` `hashkey` |
-| Berichte | `report` `reportwriter` `screen` `mask` `label` `letter` |
+| Berichte | `report` `reportwriter` `screen` `mask` `pick` `label` `letter` |
 | Terminal, Hilfe | `termput` `tset` `clear.rdb` `cursor` `menu` `rdb` `commands` `helpme` `whatis` `whatwill` `howmany` `man` |
 | Betrieb | `testall` `testsearch` `timesearch` `rmcore` `cpdir.rdb` |
 | Buchhaltung (/act) | `act` `chartdup` `foot` `adjust` `balance` `close` `consolidate` `getjournal` `fillform` `calculate` `tax` `cashflow` `calcpay` `w2` `bom` `explode` `sale` `invoice` `cstate` `update.inv` |
@@ -160,6 +219,10 @@ er nicht mehr passt (außer mit `-a`). Beide halten die Indizes aktuell.
  `row`, `compute`, `column`, `sorttable`, `jointable`, `rename`, `validate` und
  `rdb` haben dazu den Abschnitt „Case of Column Names“; er ist die einzige
  Ergänzung gegenüber den Original-Seiten.
+- `select` ist in bash, zsh und ksh ein reserviertes Wort. `select 'Cost > 5' < inventory` endet dort
+  mit `syntax error near unexpected token '<'`, weil die Shell das Schlüsselwort vor dem `PATH` auswertet.
+  Es gibt dasselbe unter dem Namen `row`. Außerdem gehen `\select ...`, `command select ...` und
+  `rdb select ...`.
 - `jointable` braucht keine vorsortierten Tabellen.
 - `ve` ist ein zeilenorientierter Editor, kein Bildschirmeditor.
 - `soundex` nutzt den Standard-Algorithmus. Die Beispielwerte im Handbuch
@@ -0,0 +1 @@
+/home/wkh/Development/Coherent/rdb/bin/rdb
@@ -0,0 +1,9 @@
+income	tax	percent
+------	---	-------
+0	0.00	0
+13539	0.00	20
+21992	1690.60	30
+36458	6030.40	40
+70365	19593.20	48
+104859	36150.32	50
+1000000	483720.82	55
@@ -0,0 +1,14 @@
+income	tax	percent
+------	---	-------
+0	0.00	0
+15200	0.00	0.77
+33200	138.60	0.88
+43500	229.20	2.64
+58000	612.00	2.97
+76200	1152.50	5.94
+82100	1502.95	6.6
+108900	3271.75	8.8
+141500	6140.55	11
+185100	10936.55	13.2
+793900	91298.15	11.85
+794000	91310.00	11.5
@@ -0,0 +1,16 @@
+income	tax	percent
+------	---	-------
+0	0.00	0
+3000	0.00	1
+6000	30.00	2
+9000	90.00	3
+12000	180.00	4
+15000	300.00	5
+18000	450.00	6
+22000	690.00	7
+26000	970.00	7.5
+30000	1270.00	8
+40000	2070.00	8.5
+74000	4960.00	9
+140000	10900.00	8.5
+200000	16000.00	8
@@ -0,0 +1,14 @@
+income	tax	percent
+------	---	-------
+0	0.00	0
+8300	0.00	0.6
+9900	9.60	1
+11500	25.60	1.5
+15700	88.60	1.8
+27200	295.60	2.2
+41800	616.80	2.4
+54300	916.80	2.6
+74100	1431.60	2.7
+88700	1825.80	2.8
+125200	2847.80	2.9
+260800	6780.80	2.6
@@ -0,0 +1,21 @@
+income	tax	percent
+------	---	-------
+0	0.00	0
+16895	0.00	2.5
+17985	27.25	4
+19075	70.85	5
+20165	125.35	6
+21255	190.75	6.5
+22345	261.60	7
+24525	414.20	8
+31065	937.40	8.5
+35425	1308.00	9
+39785	1700.40	9.5
+44145	2114.60	10.3
+65945	4360.00	10.6
+87745	6670.80	10.7
+109545	9003.40	11.2
+218545	21211.40	11.3
+327545	33528.40	11.4
+436545	45954.40	11.6
+780440	85848.40	11
@@ -0,0 +1,9 @@
+income	tax	percent
+------	---	-------
+0	0.00	0
+11600	0.00	4
+15800	168.00	6
+33800	1248.00	8
+60300	3368.00	9.2
+98400	6873.20	9.4
+264500	22482.50	8.5
@@ -0,0 +1,235 @@
+income	tax	percent
+------	---	-------
+0	0.00	0
+12348	0.00	14.228628
+12598	35.57	14.685882
+12848	72.29	15.143138
+13098	110.14	15.600392
+13348	149.15	16.057648
+13598	189.29	16.514902
+13848	230.58	16.972158
+14098	273.01	17.429413
+14348	316.58	17.886668
+14598	361.30	18.343922
+14848	407.16	18.801178
+15098	454.16	19.258432
+15348	502.31	19.715688
+15598	551.60	20.172942
+15848	602.03	20.630198
+16098	653.60	21.087453
+16348	706.32	21.544707
+16598	760.18	22.001963
+16848	815.19	22.459217
+17098	871.34	22.916473
+17348	928.63	23.373727
+17598	987.06	23.786172
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+65549	16427.33	40.544325
+65799	16528.69	40.630875
+66049	16630.27	40.717425
+66299	16732.06	40.803975
+66549	16834.07	40.890525
+66799	16936.30	40.977075
+67049	17038.74	41.063625
+67299	17141.40	41.150175
+67549	17244.28	41.236725
+67799	17347.37	41.323275
+68049	17450.68	41.409825
+68299	17554.20	41.496375
+68549	17657.94	41.582925
+68799	17761.90	41.669475
+69049	17866.07	41.756025
+69299	17970.46	41.842575
+69549	18075.07	41.963277
+69879	18213.55	42.000014
+277826	105551.32	45
@@ -0,0 +1,11 @@
+income	tax	percent
+------	---	-------
+0	0.00	0
+15900	0.00	1
+21100	52.00	3
+42300	688.00	4
+74000	1956.00	5
+105700	3541.00	6
+137400	5443.00	6.5
+169200	7510.00	7
+211400	10464.00	8
@@ -12,6 +12,9 @@ rdb select 'Description ~ /gloves/' < inventory
 ## column (project): pick columns in any order; a name that does not exist becomes a new empty column
 column Description Cost < inventory
 project Item Notes < owners
+## column -d: keep all columns except the named ones (a deletion)
+column -d Cost Value < inventory
+subtotal Date Debit Credit < journal | column -d Account Description
 ## sorttable: -n numeric, -r reverse, -f fold case
 sorttable -nr Cost < inventory
 ## compute: calculate columns from other columns (the new column must exist, so make it with addcol)
@@ -23,8 +26,14 @@ rename Owner Person < owners
 ## number / Number: number the rows (number: rows only, Number: rows and the head)
 number < owners
 Number < owners
-## record: print one record (the 3rd row)
+## record: print one record. 0 and 1 are the first row, 3 the third, -1 the last, -2 the one before
 record 3 < inventory
+record 0 < owners
+record -1 < owners
+record -2 < owners
+## beyond the end: an empty table;  not a number: an error
+record 9 < owners
+record abc < owners
 ## rmblank: drop empty rows;  headon / headoff: add or strip the head
 column Item Cost < inventory | rmblank
 headoff < colors
@@ -223,6 +232,17 @@ act
 cashflow < cash
 ## tax: look up the tax for an income in a tax table
 tax 20000 < X83
+## tax also works with the real 2026 tables of DE, AT, CH (federal tax only) and LI (Landessteuer,
+## before the municipal surcharge of 150 % to 250 %); see README. Tax on an income of 60000:
+tax 60000 < taxDE2026
+tax 60000 < taxAT2026
+tax 60000 < taxCH2026
+tax 60000 < taxLI2026
+## Swiss cantons (einfache Staatssteuer, single; still times the cantonal Steuerfuss, plus Gemeinde): AI AR SG GR
+tax 60000 < taxCH_AI2026
+tax 60000 < taxCH_AR2026
+tax 60000 < taxCH_SG2026
+tax 60000 < taxCH_GR2026
 ## explode: parts list -> all subparts with counts (part, amount)
 explode 10001 2 parttable
 ## chartdup: look for duplicate account numbers and short names in chart
@@ -265,3 +285,16 @@ bom ; cat bom
 ## update.inv: change the stock of one item, with record locking (INV names the table)
 cp inventory inv ; printf '7\n9\n\n' | INV=inv update.inv | tail -n +2
 grep '^7' inv
+
+## ===== Choosing rows on the terminal =====
+## pick shows a table, lets you scroll, filter (/) and mark rows (Space, -m), and writes the
+## chosen rows as a table, so it can sit in a pipe. It needs a terminal; -k feeds the keys instead.
+## Try it:  pick -m < inventory | total Amount Value
+## mark the 2nd and 5th row (down, space, down, down, space) and finish with enter
+pick -m -k 'down space down down space enter' < inventory
+## the same chosen rows go on into total
+pick -m -k 'down space down down space enter' < inventory | total Amount Value
+## filter with / (type, enter), then choose the row that is left
+pick -k '/clamps enter enter' < inventory
+## Esc cancels: nothing on stdout, exit status 1
+pick -k esc < inventory ; echo "status $?"
@@ -28,6 +28,23 @@ Item	Notes
 1	
 3	
 6	
+## column -d: keep all columns except the named ones (a deletion)
+$ column -d Cost Value < inventory
+Item	Amount	Description
+----	------	-----------
+1	3	rubber gloves
+2	100	test tubes
+3	5	clamps
+4	23	plates
+5	99	cleaning cloth
+6	89	bunsen burners
+7	5	scales
+$ subtotal Date Debit Credit < journal | column -d Account Description
+Date	Debit	Credit
+----	-----	------
+861222	25000	25000
+861223	10000	10000
+861224	30000	30000
 ## sorttable: -n numeric, -r reverse, -f fold case
 $ sorttable -nr Cost < inventory
 Item	Amount	Cost	Value	Description
@@ -86,11 +103,29 @@ Number	Item	Owner
 1	1	ann
 2	3	bob
 3	6	cy
-## record: print one record (the 3rd row)
+## record: print one record. 0 and 1 are the first row, 3 the third, -1 the last, -2 the one before
 $ record 3 < inventory
 Item	Amount	Cost	Value	Description
 ----	------	----	-----	-----------
 3	5	8.00	40.00	clamps
+$ record 0 < owners
+Item	Owner
+----	-----
+1	ann
+$ record -1 < owners
+Item	Owner
+----	-----
+6	cy
+$ record -2 < owners
+Item	Owner
+----	-----
+3	bob
+## beyond the end: an empty table;  not a number: an error
+$ record 9 < owners
+Item	Owner
+----	-----
+$ record abc < owners
+record: 'abc' is not a record number (1, 2, 3 ... or -1 for the last)
 ## rmblank: drop empty rows;  headon / headoff: add or strip the head
 $ column Item Cost < inventory | rmblank
 Item	Cost
@@ -845,9 +880,9 @@ Item   Amount   Cost     Value     Description
 ## tabletom4 / tabletosed / tabletostruct were shown above
 ## ===== Help and the terminal =====
 $ rdb --version
-rdb 0.4.0
+rdb 0.7.0
 $ howmany
-135
+136
 $ whatis row
   row       - make a new table where rows match logical condition
   row       row 'column condition column-or-value ..' < table
@@ -935,6 +970,25 @@ Date	Amount	Balance	Description
 ## tax: look up the tax for an income in a tax table
 $ tax 20000 < X83
   3369
+## tax also works with the real 2026 tables of DE, AT, CH (federal tax only) and LI (Landessteuer,
+## before the municipal surcharge of 150 % to 250 %); see README. Tax on an income of 60000:
+$ tax 60000 < taxDE2026
+  14233
+$ tax 60000 < taxAT2026
+  15447
+$ tax 60000 < taxCH2026
+    671
+$ tax 60000 < taxLI2026
+   1396
+## Swiss cantons (einfache Staatssteuer, single; still times the cantonal Steuerfuss, plus Gemeinde): AI AR SG GR
+$ tax 60000 < taxCH_AI2026
+   3770
+$ tax 60000 < taxCH_AR2026
+   1065
+$ tax 60000 < taxCH_SG2026
+   3344
+$ tax 60000 < taxCH_GR2026
+   3748
 ## explode: parts list -> all subparts with counts (part, amount)
 $ explode 10001 2 parttable
 Part	Amount
@@ -1107,3 +1161,27 @@ Item Number: (or hit Return key to exit.) Item=7  Amount=5  Cost=175.00  Value=8
 Amount Amount: Item Number: (or hit Return key to exit.) 
 $ grep '^7' inv
 7	9	175.00	1575	scales  
+## ===== Choosing rows on the terminal =====
+## pick shows a table, lets you scroll, filter (/) and mark rows (Space, -m), and writes the
+## chosen rows as a table, so it can sit in a pipe. It needs a terminal; -k feeds the keys instead.
+## Try it:  pick -m < inventory | total Amount Value
+## mark the 2nd and 5th row (down, space, down, down, space) and finish with enter
+$ pick -m -k 'down space down down space enter' < inventory
+Item	Amount	Cost	Value	Description
+----	------	----	-----	-----------
+2	100	0.50	50.00	test tubes
+5	99	2.45	242.55	cleaning cloth
+## the same chosen rows go on into total
+$ pick -m -k 'down space down down space enter' < inventory | total Amount Value
+Item	Amount	Cost	Value	Description
+----	------	----	-----	-----------
+	199		292.55	
+## filter with / (type, enter), then choose the row that is left
+$ pick -k '/clamps enter enter' < inventory
+Item	Amount	Cost	Value	Description
+----	------	----	-----	-----------
+3	6	8.00	48.00	clamps
+## Esc cancels: nothing on stdout, exit status 1
+$ pick -k esc < inventory ; echo "status $?"
+pick: nothing chosen
+status 1
@@ -0,0 +1,218 @@
+# frozen_string_literal: true
+
+require 'io/console'
+
+# pick -- look at a table on the terminal, scroll through it and choose one or
+# several rows.  The table comes in on the standard input, the chosen rows go
+# out on the standard output as a table, so it sits in the middle of a pipe:
+#   column Item Description < inventory | pick -m | total Item
+# The keys are read from /dev/tty (or, for scripts and tests, from -k).
+module Rdb
+  module Pick
+    KEYS = {
+      'up' => "\e[A", 'down' => "\e[B", 'pgup' => "\e[5~", 'pgdn' => "\e[6~",
+      'home' => "\e[H", 'end' => "\e[F", 'enter' => "\r", 'space' => ' ',
+      'esc' => "\e", 'backspace' => "\x7f"
+    }.freeze
+
+    # The state of one session: which rows are shown, where the cursor is,
+    # which rows are marked.  Knows nothing about the terminal.
+    class Session
+      attr_reader :head, :rows, :cursor, :top, :filter, :marked
+
+      def initialize(head, rows, multi: false)
+        @head = head
+        @rows = rows
+        @multi = multi
+        @marked = []
+        @filter = +''
+        @typing = false
+        @cursor = 0
+        @top = 0
+        @height = 20
+        @width = 80
+        refilter
+      end
+
+      def resize(height, width)
+        @height = [height, 1].max
+        @width = [width, 20].max
+        scroll
+      end
+
+      def typing? = @typing
+
+      # Indices (into rows) of the rows that pass the filter.
+      def visible = @visible
+
+      def current = @visible[@cursor]
+
+      # Rows to hand on: the marked ones, else the row under the cursor.
+      def selected
+        idx = @marked.empty? ? [current].compact : @marked.sort
+        idx.map { |i| @rows[i] }
+      end
+
+      # Returns :accept or :cancel when the session is over.
+      def feed(key)
+        @typing ? type(key) : browse(key)
+      end
+
+      def render
+        widths = @head.each_index.map { |i| ([@head[i]] + @rows.map { |r| r[i].to_s }).map(&:size).max }
+        line = ->(cells) { cells.each_with_index.map { |c, i| c.to_s.ljust(widths[i]) }.join('  ').rstrip }
+        out = +"\e[?25l\e[H"
+        out << "\e[K  \e[1m#{fit(line.(@head))}\e[0m\r\n"
+        out << "\e[K  #{fit(widths.map { |w| '-' * w }.join('  '))}\r\n"
+        @height.times do |n|
+          pos = @top + n
+          i = @visible[pos]
+          out << "\e[K"
+          if i
+            text = "#{@marked.include?(i) ? '*' : ' '} #{fit(line.(@rows[i]))}"
+            out << (pos == @cursor ? "\e[7m#{text}\e[0m" : text)
+          end
+          out << "\r\n"
+        end
+        out << "\e[K#{status}"
+        out
+      end
+
+      private
+
+      def fit(text) = text[0, @width - 2]
+
+      def status
+        keys = @typing ? 'type to filter  Enter keep  Esc clear' : "Enter ok#{'  Space mark  a all' if @multi}  / filter  Esc cancel"
+        filter = @filter.empty? && !@typing ? '' : "  /#{@filter}#{'_' if @typing}"
+        "\e[7m #{@visible.empty? ? 0 : @cursor + 1}/#{@visible.size} of #{@rows.size}" \
+          "#{"  marked #{@marked.size}" if @multi}#{filter}  #{keys} \e[0m"
+      end
+
+      def browse(key)
+        case key
+        when "\e[A" then move(-1)
+        when "\e[B" then move(1)
+        when "\e[5~" then move(-@height)
+        when "\e[6~" then move(@height)
+        when "\e[H", "\e[1~", "\eOH" then move(-@visible.size)
+        when "\e[F", "\e[4~", "\eOF" then move(@visible.size)
+        when "\r", "\n" then return selected.empty? ? :cancel : :accept
+        when ' ' then toggle
+        when 'a' then mark_all if @multi
+        when '/' then @typing = true
+        when "\x03", "\e", 'q' then return :cancel
+        end
+        nil
+      end
+
+      def type(key)
+        case key
+        when "\r", "\n" then @typing = false
+        when "\e" then @filter.clear; @typing = false; refilter
+        when "\x03" then return :cancel
+        when "\x7f", "\b" then @filter.chop!; refilter
+        else
+          if key.size == 1 && key.ord >= 32
+            @filter << key
+            refilter
+          end
+        end
+        nil
+      end
+
+      def refilter
+        needle = @filter.downcase
+        @visible = @rows.each_index.select { |i| needle.empty? || @rows[i].join("\t").downcase.include?(needle) }
+        @cursor = [@cursor, [@visible.size - 1, 0].max].min
+        scroll
+      end
+
+      def move(delta)
+        @cursor = (@cursor + delta).clamp(0, [@visible.size - 1, 0].max)
+        scroll
+      end
+
+      def scroll
+        @top = @cursor if @cursor < @top
+        @top = @cursor - @height + 1 if @cursor >= @top + @height
+        @top = 0 if @top.negative?
+      end
+
+      def toggle
+        return unless @multi && current
+
+        @marked.include?(current) ? @marked.delete(current) : @marked << current
+        move(1)
+      end
+
+      def mark_all
+        all = @visible.all? { |i| @marked.include?(i) }
+        all ? @marked -= @visible : @marked |= @visible
+      end
+    end
+
+    def self.run(session, tty)
+      tty.raw do
+        tty.write "\e[?1049h"
+        begin
+          loop do
+            rows, cols = tty.winsize
+            session.resize((rows.zero? ? 24 : rows) - 3, cols.zero? ? 80 : cols)
+            tty.write session.render
+            key = begin
+              Rdb::Mask.read_key(tty)
+            rescue EOFError
+              "\x03"
+            end
+            result = session.feed(key)
+            return result if result
+          end
+        ensure
+          tty.write "\e[?25h\e[?1049l"
+        end
+      end
+    end
+
+    # Words of a -k script: a name from KEYS, or else every character is one key.
+    def self.script(words)
+      words.split.flat_map { |w| KEYS.key?(w) ? [KEYS[w]] : w.chars }
+    end
+  end
+end
+
+Rdb.register('pick', 'Scroll through a table and choose one or more rows', 'pick [-m] [-k keys] < table > chosenrows') do |args|
+  multi = !args.delete('-m').nil?
+  keys = nil
+  if (i = args.index('-k'))
+    keys = args[i + 1] or die 'usage: pick [-m] [-k keys] < table'
+    args.slice!(i, 2)
+  end
+  die 'usage: pick [-m] [-k "down space enter"] < table > chosenrows' unless args.empty?
+
+  t = table_in
+  die 'pick: the table is empty' if t.rows.empty?
+  session = Rdb::Pick::Session.new(t.head, t.rows, multi: multi)
+
+  result = nil
+  if keys
+    session.resize(21, 80)
+    Rdb::Pick.script(keys).each do |k|
+      result = session.feed(k)
+      break if result
+    end
+  else
+    tty = begin
+      File.open('/dev/tty', 'r+')
+    rescue SystemCallError
+      die 'no terminal available (pick takes its keys from /dev/tty; see -k)'
+    end
+    result = Rdb::Pick.run(session, tty)
+    tty.close
+  end
+  unless result == :accept
+    warn 'pick: nothing chosen'
+    exit 1
+  end
+  Rdb::Table.new(t.head, session.selected).write
+end
@@ -11,9 +11,20 @@ Rdb.register('row', 'Make a new table where rows match logical condition',
 end
 Rdb.alias_for('select', 'row')

-Rdb.register('column', 'Display columns of a table in any order', 'column [ Column ... ] < tableorlist') do |args|
+Rdb.register('column', 'Display columns of a table in any order', 'column [ -d ] [ Column ... ] < tableorlist') do |args|
+  drop = args.first == '-d'
+  args.shift if drop
  t = table_in
-  next t.write if args.empty?
+  next t.write if args.empty? && !drop
+  die 'usage: column -d Column ... < tableorlist' if drop && args.empty?
+
+  if drop # keep every column except the named ones
+    gone = args.map { |a| t.index_of(a) }
+    keep = t.head.each_index.reject { |i| gone.include?(i) }
+    die 'column -d would delete every column' if keep.empty?
+
+    next t.with(head: keep.map { |i| t.head[i] }, rows: t.rows.map { |r| keep.map { |i| r[i] } }).write
+  end

  idx = args.map { |a| Rdb.column_index(t.head, a) }
  head = args.each_with_index.map { |a, n| idx[n] ? t.head[idx[n]] : a }
@@ -72,8 +83,12 @@ end

 Rdb.register('record', 'Find and output a record from a table', 'record number < table') do |args|
  die 'usage: record number < table' unless args.size == 1
+  die "'#{args[0]}' is not a record number (1, 2, 3 ... or -1 for the last)" unless args[0].match?(/\A[+-]?\d+\z/)
+
+  # 0 and 1 are the first record; -1 is the last, -2 the one before it ...
  t = table_in
-  row = t.rows[args[0].to_i - 1]
+  n = args[0].to_i
+  row = n.negative? ? (t.rows[n] if -n <= t.rows.size) : t.rows[[n, 1].max - 1]
  t.with(rows: row ? [row] : []).write
 end

@@ -160,12 +175,14 @@ end
 Rdb.register('splittable', 'Divide a table horizontally', 'splittable [-n] table') do |args|
  n = 50
  n = args.shift[1..].to_i if args.first&.match?(/\A-\d+\z/)
-  die 'usage: splittable [-n] table' unless args.size == 1
+  die 'usage: splittable [-n] table   (n is at least 1)' unless args.size == 1 && n.positive?
+
  t = open_table(args[0])
+  chunks = t.rows.each_slice(n).to_a
+  die "#{args[0]}: #{t.rows.size} rows in pieces of #{n} need #{chunks.size} files, but there are only 676 names (aa to zz)" if chunks.size > 676
+
  suffix = ('aa'..'zz').each
-  t.rows.each_slice(n) do |chunk|
-    File.write("#{args[0]}#{suffix.next}", t.with(rows: chunk).to_s)
-  end
+  chunks.each { |chunk| File.write("#{args[0]}#{suffix.next}", t.with(rows: chunk).to_s) }
 end

 # ---- aggregates ------------------------------------------------------------
@@ -81,9 +81,10 @@ end
 # ---- manual pages ---------------------------------------------------------------

 def troff_clean(str)
-  str.gsub(/\\f[BIRP]/, '').gsub('\\e', '\\').gsub('\\(em', ' -- ').gsub('\\(aa', "'")
+  # a literal backslash (\\ or \e) is parked in \0 so that later rules cannot see it
+  str.gsub('\\\\', "\0").gsub(/\\f[BIRP]/, '').gsub('\\e', "\0").gsub('\\(em', ' -- ').gsub('\\(aa', "'")
     .gsub('\\-', '-').gsub('\\&', '').gsub('\\*(UX', 'UNIX').gsub('``', '"').gsub("''", '"').gsub('\\ ', ' ')
-     .gsub(/\\\(..|\\\*\(..|\\[a-z]/, '').gsub('\\\\', '\\')
+     .gsub(/\\\(..|\\\*\(..|\\[a-z]/, '').gsub("\0", '\\')
 end

 def render_man(src)
@@ -147,8 +148,11 @@ Rdb.register('man', 'Display the manual page for a command', 'man [-g] command')
  args.each do |a|
    f = File.join(Rdb::ROOT, 'man', "#{a == 'Number' ? 'number.c' : a}.man")
    File.exist?(f) or die("no manual page for '#{a}'")
-    desc = File.read(f)[/^\.PC\s+"?(.*?)"?\s*$/, 1]
-    puts "#{a}#{desc ? " -- #{troff_clean(desc)}" : ''}", '=' * 60
+    src = File.read(f)
+    desc = src[/^\.PC[ \t]+"?(.*?)"?[ \t]*$/, 1]
+    # topic pages (dash line, head line ...) have an empty .PC; their title is in .TH
+    title = desc.to_s.empty? && src =~ /^\.TH\s+(?:"([^"]*)"|(\S+))/ ? ($1 || $2) : nil
+    puts "#{title || a}#{desc.to_s.empty? ? '' : " -- #{troff_clean(desc)}"}", '=' * 60
    puts render_man(File.read(f)), ''
  end
 end
@@ -1,5 +1,5 @@
 # frozen_string_literal: true

 module Rdb
-  VERSION = '0.4.0'
+  VERSION = '0.7.0'
 end
@@ -129,6 +129,24 @@ Names that are also
 reserved words or are followed by
 .B (
 are never taken for columns.
+.SH "Deleting Columns"
+.I "(Ruby re-creation only.)"
+.DM
+column -d Column ... < tableorlist
+.DE
+.PP
+With the option
+.BR -d ,
+.B column
+keeps every column
+.I except
+those named.
+The order of the other columns stays as it is.
+It is an error to name a column that does not exist,
+or to delete every column.
+.DM
+subtotal Date Debit Credit < journal | column -d Account Description
+.DE
 .SH "See Also"
 .B
 project,
@@ -0,0 +1,83 @@
+.TH pick "" "" "/rdb Command"
+.PC "Scroll through a table and choose one or more rows"
+\fBpick \fB[ -m ] [ -k \fIkeys\fB ] < \fItable \fB> \fIchosenrows\fR
+.PP
+.II "pick^choose rows"
+.II "table^scroll"
+.I "(Ruby re-creation only; the original /rdb has no such command.)"
+.PP
+The command
+.B pick
+shows
+.I table
+on the terminal, lets the user scroll through it, and writes the rows
+that were chosen as a table on the standard output.
+It therefore fits into the middle of a pipe:
+.DM
+column Item Description < inventory | pick -m | jointable - owners
+pick -m < inventory | total Amount Value
+.DE
+.PP
+The table is read from the standard input;
+the keys are read from the terminal (\fB/dev/tty\fR).
+A list is read like a table, and the output is always a table.
+The head and the dash line stay at the top while the rows scroll.
+.SH Keys
+.nf
+Up, Down             move the cursor one row
+PgUp, PgDn           move a page
+Home, End            first or last row
+Enter                choose and finish
+Space                mark the row, move down (with -m)
+a                    mark all shown rows; again, unmark them (with -m)
+/                    filter: type text, shown rows must contain it
+                       (Enter keeps the filter, Esc clears it)
+Esc, q, Ctrl-C       cancel
+.fi
+.PP
+.B pick
+writes the marked rows in table order.
+If no row is marked, it writes the row under the cursor.
+Marks stay when a filter hides the row.
+If the user cancels, or the filter leaves no row to choose,
+.B pick
+writes nothing and exits with status 1.
+.SH Options
+.IP \fB-m\fR 0.5i
+Allow several rows: Space marks, \fBa\fR marks all.
+Without it, Enter chooses the row under the cursor.
+.IP "\fB-k\fR \fIkeys\fR"
+Take the keys from this string instead of the terminal.
+Words are key names:
+.BR up ,
+.BR down ,
+.BR pgup ,
+.BR pgdn ,
+.BR home ,
+.BR end ,
+.BR enter ,
+.BR space ,
+.BR esc ,
+.BR backspace ;
+any other word is typed character by character.
+This is for scripts, demonstrations and tests.
+.SH Example
+.DM
+pick -m -k 'down space down down space enter' < inventory
+.DE
+.PP
+marks the second and the fifth row and prints:
+.DM
+Item   Amount   Cost   Value    Description
+----   ------   ----   ------   --------------
+2      100      0.50   50.00    test tubes
+5      99       2.45   242.55   cleaning cloth
+.DE
+.SH "See Also"
+.B
+display,
+mask,
+row,
+search
+.R
+.SO rdb
@@ -59,6 +59,17 @@ you see output in the following format:
 .DM
 	Item 1 is rubber gloves
 .DE
+.SH "Record Numbers"
+.I "(Ruby re-creation only.)"
+Records are counted from 1.
+The numbers 0 and 1 both mean the first record.
+A negative number counts from the end:
+.B \-1
+is the last record,
+.B \-2
+the one before it, and so on.
+A number beyond either end gives a table without records.
+Anything that is not a whole number is an error.
 .SH "See Also"
 .B
 row,
@@ -191,6 +191,32 @@ Names that are also
 reserved words or are followed by
 .B (
 are never taken for columns.
+.SH "Using select in a Shell"
+.I "(Ruby re-creation only.)"
+.B select
+is another name for
+.BR row ,
+but in
+.BR bash ,
+.B zsh
+and
+.B ksh
+``select'' is a reserved word of the shell.
+The shell recognizes it before it looks for a program, so
+.DM
+select 'Cost > 5' < inventory
+.DE
+.PP
+stops with a syntax error at the ``<''.
+Use the name
+.B row
+instead, or protect the word from the shell:
+.DM
+row 'Cost > 5' < inventory
+\\select 'Cost > 5' < inventory
+command select 'Cost > 5' < inventory
+rdb select 'Cost > 5' < inventory
+.DE
 .SH "See Also"
 .B
 compute,
@@ -1,5 +1,7 @@
 [tools]
+"cargo:scryer-prolog" = "0.10"
 ruby = "3.4"
+rust = "1.99"

 [env]
 _.path = ["{{config_root}}/bin"]
@@ -5,6 +5,65 @@ require 'pty'
 require_relative '../lib/rdb'

 class SelectionTest < RdbCase
+  def test_column_d_deletes_columns
+    out = rdb('column', '-d', 'Cost', 'Value', file: 'inventory')
+    assert_equal %w[Item Amount Description], out.lines.first.chomp.split("\t")
+    assert_equal %w[1 3 rubber\ gloves], data(out).first
+    assert_equal %w[Date Debit Credit], rdb('column', '-d', 'Account', 'Description', stdin: rdb('subtotal', 'Date', 'Debit', 'Credit', file: 'journal')).lines.first.chomp.split("\t")
+  end
+
+  def test_column_d_errors
+    src = File.read(File.join(@dir, 'owners'))
+    [%w[-d], %w[-d Nope], %w[-d Item Owner]].each do |args|
+      out, err, st = run3('column', *args, stdin: src)
+      refute st.success?, "column #{args.join(' ')} should fail"
+      assert_equal '', out
+      refute_empty err
+    end
+  end
+
+  def test_column_d_works_on_lists_and_with_icase
+    list = rdb('tabletolist', file: 'owners')
+    assert_includes rdb('column', '-d', 'Item', stdin: list), "Owner\tann"
+    out, _e, st = run3('column', '-d', 'COST', stdin: File.read(File.join(@dir, 'inventory')), env: { 'RDB_ICASE' => '1' })
+    assert st.success?
+    refute_includes out.lines.first, 'Cost'
+  end
+
+  def test_splittable_pieces_and_errors
+    out, = run3('splittable', '-4', 'inventory')
+    assert_equal 4, data(File.read(File.join(@dir, 'inventoryaa'))).size
+    assert_equal 3, data(File.read(File.join(@dir, 'inventoryab'))).size
+    assert_includes File.read(File.join(@dir, 'inventoryab')), "Item\tAmount"
+    _o, err, st = run3('splittable', '-0', 'inventory')
+    refute st.success?
+    assert_match(/usage/, err)
+    write('big', "N\n-\n#{(1..700).to_a.join("\n")}\n")
+    _o, err, st = run3('splittable', '-1', 'big')
+    refute st.success?
+    assert_match(/only 676 names/, err)
+    assert_empty Dir[File.join(@dir, 'bigaa')] # nothing is written when it cannot all be written
+  end
+
+  def test_record_zero_and_one_are_the_first_and_negatives_count_from_the_end
+    { '0' => '1', '1' => '1', '2' => '3', '3' => '6', '-1' => '6', '-2' => '3', '-3' => '1', '+2' => '3' }.each do |n, item|
+      assert_equal [[item]], data(rdb('record', n, file: 'owners')).map { |r| r.first(1) }, "record #{n}"
+    end
+  end
+
+  def test_record_beyond_either_end_is_an_empty_table
+    %w[4 9 -4 -9].each { |n| assert_equal [], data(rdb('record', n, file: 'owners')), "record #{n}" }
+  end
+
+  def test_record_rejects_junk
+    %w[abc 2.5 1e3].each do |n|
+      out, err, st = run3('record', n, stdin: File.read(File.join(@dir, 'owners')))
+      refute st.success?, "record #{n} should fail"
+      assert_equal '', out
+      assert_match(/not a record number/, err)
+    end
+  end
+
  def test_row_numeric_condition
    out = rdb('row', 'Cost > 5', file: 'inventory')
    assert_equal %w[3 6 7], data(out).map(&:first)
@@ -429,7 +488,7 @@ end

 class HelpTest < RdbCase
  def test_whatis_whatwill_commands
-    assert_includes rdb('whatis', 'column'), "   column    - display columns of a table in any order\n   column    column [ Column ... ] < tableorlist\n"
+    assert_includes rdb('whatis', 'column'), "   column    - display columns of a table in any order\n   column    column [ -d ] [ Column ... ] < tableorlist\n"
    assert_includes rdb('whatwill', 'total'), 'subtotal'
    assert_operator data(rdb('commands')).size, :>, 120
    assert_operator rdb('howmany').to_i, :>, 120
@@ -447,6 +506,12 @@ class HelpTest < RdbCase
    assert_equal "\e[3;8H", rdb('cursor', '3', '8')
  end

+  def test_man_topic_pages_get_their_title
+    assert_equal 'dash line', rdb('man', 'dashline').lines.first.chomp
+    assert_equal 'head line', rdb('man', 'headline').lines.first.chomp
+    assert_match(/\Arow -- Make a new table/, rdb('man', 'row'))
+  end
+
  def test_testall_mentions_every_command
    script = File.read(File.join(DEMO, 'testall.cmds'))
    names = data(rdb('commands')).map(&:first)
@@ -618,3 +683,158 @@ class MaskTest < RdbCase
    assert_equal '', table
  end
 end
+
+class PickTest < RdbCase
+  def session(multi: true, height: 3)
+    t = Rdb::Table.read(File.open(File.join(DEMO, 'inventory')))
+    Rdb::Pick::Session.new(t.head, t.rows, multi: multi).tap { |x| x.resize(height, 80) }
+  end
+
+  def keys(sess, words) = Rdb::Pick.script(words).map { |k| sess.feed(k) }.compact.last
+
+  def test_mark_and_select
+    s = session
+    assert_equal :accept, keys(s, 'down space down down space enter')
+    assert_equal %w[2 5], s.selected.map(&:first)
+  end
+
+  def test_single_mode_takes_the_cursor_row_and_ignores_space
+    s = session(multi: false)
+    assert_equal :accept, keys(s, 'down down space enter')
+    assert_equal %w[3], s.selected.map(&:first)
+  end
+
+  def test_scrolling_keeps_the_cursor_in_view
+    s = session(height: 3)
+    keys(s, 'down down down down')
+    assert_equal [4, 2], [s.cursor, s.top]
+    keys(s, 'end')
+    assert_equal [6, 4], [s.cursor, s.top]
+    keys(s, 'pgup')
+    assert_equal 3, s.cursor
+    keys(s, 'home')
+    assert_equal [0, 0], [s.cursor, s.top]
+  end
+
+  def test_filter_and_clear
+    s = session
+    keys(s, '/clam')
+    assert_predicate s, :typing?
+    keys(s, 'enter')
+    assert_equal [2], s.visible
+    keys(s, '/ esc')
+    assert_equal 7, s.visible.size
+  end
+
+  def test_marks_survive_a_filter_and_a_all_toggles
+    s = session
+    keys(s, 'space /scales enter')
+    assert_equal [0], s.marked
+    keys(s, 'a')
+    assert_equal [0, 6], s.marked.sort
+    keys(s, 'a')
+    assert_equal [0], s.marked
+  end
+
+  def test_cancel_and_empty_choice
+    assert_equal :cancel, keys(session, 'esc')
+    assert_equal :cancel, keys(session, '/zzz enter enter')
+  end
+
+  def test_command_with_keys_script_is_a_filter
+    out = rdb('pick', '-m', '-k', 'down space down down space enter', file: 'inventory')
+    assert_equal %w[2 5], data(out).map(&:first)
+    assert_equal '292.55', data(rdb('total', 'Value', stdin: out)).first[3]
+  end
+
+  def test_command_cancelled_exits_1_with_no_output
+    out, _err, st = run3('pick', '-k', 'esc', stdin: File.read(File.join(@dir, 'inventory')))
+    refute st.success?
+    assert_equal '', out
+  end
+
+  def test_command_reads_a_list
+    out = rdb('pick', '-k', 'down enter', stdin: rdb('tabletolist', file: 'owners'))
+    assert_equal [%w[3 bob]], data(out)
+  end
+
+  def run_on_pty(*key_strokes)
+    out = File.join(@dir, 'pick.out')
+    result = nil
+    PTY.spawn({ 'PATH' => "#{BIN}:#{ENV['PATH']}" }, 'sh', '-c', "cd #{@dir} && pick -m < inventory > pick.out") do |r, w, pid|
+      sleep 0.5
+      key_strokes.each do |k|
+        w.write k
+        sleep 0.1
+        r.read_nonblock(65_536) rescue nil
+      end
+      sleep 0.3
+      r.read_nonblock(65_536) rescue nil
+      _, st = Process.wait2(pid)
+      result = [File.exist?(out) ? File.read(out) : '', st.exitstatus]
+    end
+    result
+  end
+
+  def test_pick_on_a_terminal
+    table, status = run_on_pty("\e[B", ' ', "\e[B", ' ', "\r")
+    assert_equal 0, status
+    assert_equal %w[2 4], data(table).map(&:first)
+  end
+
+  def test_pick_on_a_terminal_cancel
+    table, status = run_on_pty("\e[B", "\e")
+    assert_equal 1, status
+    assert_equal '', table
+  end
+end
+
+class TaxTablesTest < RdbCase
+  def tax(income, table) = rdb('tax', income.to_s, file: table).to_i
+
+  def test_at_2026
+    assert_equal 0, tax(13_539, 'taxAT2026')
+    assert_equal 11_447, tax(50_000, 'taxAT2026') # 6 030.40 + 13 542 * 40 %
+    assert_equal 33_818, tax(100_000, 'taxAT2026')
+  end
+
+  def test_ch_federal_2026
+    assert_equal 0, tax(15_200, 'taxCH2026')
+    assert_equal 401, tax(50_000, 'taxCH2026')
+    assert_equal 2684, tax(100_000, 'taxCH2026')
+    assert_equal 91_310, tax(794_000, 'taxCH2026')
+  end
+
+  def test_li_landessteuer_2026
+    assert_equal 996, tax(50_000, 'taxLI2026')   # 0,04 * x - 1 004
+    assert_equal 3256, tax(100_000, 'taxLI2026') # 0,05 * x - 1 744
+    assert_equal 10_464, tax(211_400, 'taxLI2026')
+    assert_equal 0, tax(15_855, 'taxLI2026')
+  end
+
+  def test_swiss_cantons_2026_einfache_staatssteuer
+    assert_equal 3770, tax(60_000, 'taxCH_AI2026') # 2 070 + 8,5 % of 20 000
+    assert_equal 16_000, tax(200_000, 'taxCH_AI2026')
+    assert_equal 24_000, tax(300_000, 'taxCH_AI2026') # 8 % of the whole income
+    assert_equal 1065, tax(60_000, 'taxCH_AR2026')
+    assert_equal 3344, tax(60_000, 'taxCH_SG2026')    # 1 248 + 8 % + 9,2 % pieces
+    assert_equal 25_500, tax(300_000, 'taxCH_SG2026') # 8,5 % of the whole income
+    assert_equal 3748, tax(60_000, 'taxCH_GR2026')
+    assert_equal 0, tax(16_895, 'taxCH_GR2026')
+    assert_equal 20, tax(5_000, 'taxCH_AI2026') # 1 % of 2 000
+    %w[AR SG GR].each { |c| assert_equal 0, tax(5_000, "taxCH_#{c}2026") }
+  end
+
+  # § 32a EStG: the table is a straight-line approximation of the curved zones
+  def test_de_2026_follows_the_formula
+    [12_348, 14_000, 17_799, 20_000, 33_333, 50_000, 69_878, 100_000, 277_825, 300_000].each do |x|
+      exact = if x <= 12_348 then 0
+              elsif x <= 17_799 then y = (x - 12_348) / 10_000.0; ((914.51 * y) + 1400) * y
+              elsif x <= 69_878 then z = (x - 17_799) / 10_000.0; (((173.10 * z) + 2397) * z) + 1034.87
+              elsif x <= 277_825 then (0.42 * x) - 11_135.63
+              else (0.45 * x) - 19_470.38
+              end
+      assert_in_delta exact.floor, tax(x, 'taxDE2026'), 1, "income #{x}"
+    end
+  end
+end
@@ -0,0 +1,94 @@
+# frozen_string_literal: true
+
+# Writes the 2026 income tax tables in the format of `tax` (income, tax, percent)
+# into demo/. Sources: § 32a EStG (DE), § 33 EStG (AT), Tarif 2026 Art. 36 DBG (CH,
+# ESTV Rundschreiben 2-215-D-2025), Art. 19 SteG LR 640.0, Fassung 01.07.2026 (LI).
+#   ruby tools/gen_tax_tables.rb
+
+DEMO = File.expand_path('../demo', __dir__)
+
+def write_table(name, points)
+  rows = points.map { |i, t, p| [i.to_s, format('%.2f', t), format('%.6f', p).sub(/0+\z/, '').sub(/\.\z/, '')] }
+  File.write(File.join(DEMO, name), "income\ttax\tpercent\n------\t---\t-------\n#{rows.map { |r| r.join("\t") }.join("\n")}\n")
+end
+
+# --- Germany: single assessment, § 32a Abs. 1 (the zones 2 and 3 are curves, so
+# the table approximates them with short straight pieces; error below one euro)
+def de_tax(x)
+  if x <= 12_348 then 0.0
+  elsif x <= 17_799 then y = (x - 12_348) / 10_000.0; ((914.51 * y) + 1400) * y
+  elsif x <= 69_878 then z = (x - 17_799) / 10_000.0; (((173.10 * z) + 2397) * z) + 1034.87
+  elsif x <= 277_825 then (0.42 * x) - 11_135.63
+  else (0.45 * x) - 19_470.38
+  end
+end
+
+de = [12_348] + (12_598..17_798).step(250).to_a + [17_799] + (18_049..69_549).step(250).to_a + [69_879, 277_826]
+pts = de.each_with_index.map do |i, n|
+  nxt = de[n + 1]
+  slope = nxt ? (de_tax(nxt) - de_tax(i)) / (nxt - i) * 100 : 45.0
+  [i, de_tax(i), slope]
+end
+write_table('taxDE2026', [[0, 0.0, 0.0]] + pts)
+
+# --- Austria: § 33 EStG, the tariff before the Absetzbeträge
+at = [[13_539, 20], [21_992, 30], [36_458, 40], [70_365, 48], [104_859, 50], [1_000_000, 55]]
+acc = 0.0
+prev = [0, 0]
+pts = [[0, 0.0, 0.0]]
+at.each do |limit, rate|
+  acc += (limit - prev[0]) * prev[1] / 100.0
+  pts << [limit, acc, rate]
+  prev = [limit, rate]
+end
+write_table('taxAT2026', pts)
+
+# --- Switzerland: direct federal tax, Art. 36 DBG, single persons (without canton and municipality)
+ch = [[0, 0, 0], [15_200, 0, 0.77], [33_200, 138.60, 0.88], [43_500, 229.20, 2.64], [58_000, 612.00, 2.97],
+      [76_200, 1152.50, 5.94], [82_100, 1502.95, 6.60], [108_900, 3271.75, 8.80], [141_500, 6140.55, 11.00],
+      [185_100, 10_936.55, 13.20], [793_900, 91_298.15, 11.85], [794_000, 91_310.00, 11.50]]
+write_table('taxCH2026', ch)
+
+# --- Liechtenstein: Landessteuer, Art. 19 Abs. 1 Bst. a SteG; the municipal surcharge
+# (150 % to 250 % of it) comes on top: total = Landessteuer * (1 + surcharge / 100)
+li_rates = [[15_900, 1], [21_100, 3], [42_300, 4], [74_000, 5], [105_700, 6], [137_400, 6.5], [169_200, 7], [211_400, 8]]
+acc = 0.0
+prev = [15_855, 0]
+pts = [[0, 0.0, 0.0]]
+li_rates.each do |limit, rate|
+  acc += (limit - prev[0]) * prev[1] / 100.0 if prev[1].positive?
+  pts << [limit, acc, rate]
+  prev = [limit, rate]
+end
+write_table('taxLI2026', pts)
+
+# --- Swiss cantons: the "einfache Staatssteuer" for single persons, before the Steuerfuss and
+# without municipal and church tax. Source: ESTV Kantonsblätter (Steuerinformationen 2026).
+# Each tariff is a list of [width, rate] pieces; above the last piece one flat rate applies to
+# the whole income (the cantons call this "für das ganze Einkommen").
+def staircase(pieces, flat_rate, expect_limit)
+  acc = 0.0
+  start = 0
+  pts = []
+  pieces.each do |width, rate|
+    pts << [start, acc, rate]
+    acc += width * rate / 100.0
+    start += width
+  end
+  raise "limit #{start} != #{expect_limit}" unless start == expect_limit
+
+  pts << [start, start * flat_rate / 100.0, flat_rate]
+end
+
+# AI: Art. 38 StG
+write_table('taxCH_AI2026', staircase([[3_000, 0], [3_000, 1], [3_000, 2], [3_000, 3], [3_000, 4], [3_000, 5], [4_000, 6],
+                                    [4_000, 7], [4_000, 7.5], [10_000, 8], [34_000, 8.5], [66_000, 9], [60_000, 8.5]], 8, 200_000))
+# AR: Art. 39 Abs. 1 lit. b StG (Alleinstehendentarif, Beträge ab Steuerperiode 2024); multiplied by the Steuereinheiten
+write_table('taxCH_AR2026', staircase([[8_300, 0], [1_600, 0.6], [1_600, 1.0], [4_200, 1.5], [11_500, 1.8], [14_600, 2.2],
+                                    [12_500, 2.4], [19_800, 2.6], [14_600, 2.7], [36_500, 2.8], [135_600, 2.9]], 2.6, 260_800))
+# SG: Art. 50 StG (Beträge ab Steuerperiode 2026)
+write_table('taxCH_SG2026', staircase([[11_600, 0], [4_200, 4], [18_000, 6], [26_500, 8], [38_100, 9.2], [166_100, 9.4]], 8.5, 264_500))
+# GR: Art. 39 Abs. 1 StG (indexierte Beträge ab Steuerperiode 2025)
+write_table('taxCH_GR2026', staircase([[16_895, 0], [1_090, 2.5], [1_090, 4], [1_090, 5], [1_090, 6], [1_090, 6.5], [2_180, 7],
+                                    [6_540, 8], [4_360, 8.5], [4_360, 9], [4_360, 9.5], [21_800, 10.3], [21_800, 10.6],
+                                    [21_800, 10.7], [109_000, 11.2], [109_000, 11.3], [109_000, 11.4], [343_895, 11.6]], 11.0, 780_440))
Author	SHA1	Message	Date
wkh	80941b6f03	Version 0.7.0: Kantonstarife 2026 (taxCH_AI/AR/SG/GR)	2026-10-12 00:27:06 +02:00
wkh	a02e5cb109	column -d: Spalten löschen	2026-10-12 00:10:36 +02:00
wkh	a9f3c0b255	demo: Reste von splittable (colorsaa-ac) entfernt	2026-10-11 23:58:58 +02:00
wkh	2e03c0a440	rdb man: Titel der Themen-Seiten (dashline, headline ...) aus .TH	2026-10-11 23:56:05 +02:00
wkh	6b9810b075	mise: Rust 1.99 und Scryer Prolog 0.10 für die Prolog-Ausgaben	2026-10-11 23:32:07 +02:00
wkh	b11e3da453	splittable: klare Fehler für -0 und mehr als 676 Stücke	2026-10-11 23:23:37 +02:00
wkh	1c66773ff4	Version 0.6.0: Steuertabellen 2026, record mit negativen Nummern, select-Hinweis	2026-10-11 22:55:35 +02:00
wkh	e1bdb6c703	Changelog geordnet	2026-10-11 22:51:52 +02:00
wkh	777a3b56e2	record: 0 und 1 = erste Zeile, negative Nummern zählen vom Ende	2026-10-11 22:51:43 +02:00
wkh	d5286c3600	record: Nummern unter 1 und Text sind ein Fehler statt Zeilen vom Ende	2026-10-11 22:48:42 +02:00
wkh	f83d1bd6f8	Steuertabellen 2026 für DE, AT, CH (Bund) und LI (Land) zu tax	2026-10-11 22:44:45 +02:00
wkh	6c0d675c5d	Hinweis zu select (README, row.man); Backslash in rdb man korrigiert	2026-10-11 22:35:37 +02:00
wkh	d2c4343136	Version 0.5.0: pick, Zeilen auf dem Terminal wählen	2026-10-11 22:25:45 +02:00