Calculator

An input palette: what you type is answered on every keystroke. Three parsers take the query in turn, dates and time zones first, then currencies, then mathjs for arithmetic and units. The result is the row's title, the query as it was understood is the subtitle (12 USD to TRY), and a second row carries another form when there is one: the reverse conversion, a fraction, the hex and binary of an integer, the ISO date. A query that does not parse lists nothing, so nothing flashes while you type; with nothing typed the palette shows three hint rows.

At the root, a query that reads as sums, a conversion, a date or a time (2+2, 12 usd to try, next friday, time in tokyo, 1759000000) is answered inline under a Calculator section, with the same actions; a bare number or a single word (42, mon, friday) never is, so app names stay undisturbed. Anything else can be typed into the palette itself.

What works

Times are 24 h whatever the locale. 3pm in tokyo is your 3pm there; 3pm tokyo is Tokyo's 3pm here. A bare 10-digit number starting with 1 (2001 to 2033) is read as a unix time, @ reads any; other numbers stay numbers. Month and day names are English or Turkish (aralık, aralik, cuma, gelecek salı). 45m + 10m is metres: minutes need an hour beside them or a spelled-out min.

Currencies are the 30 the ECB fixes (USD, EUR, GBP, TRY, JPY, CHF and the rest); symbols ($ € £ ₺ ¥ ₹), names (dollars, lira, quid) and ISO codes in any case are understood, to, in, as and → join the two sides, 1k and 2.5m are thousands and millions. Zones are IANA ids, utc+3 offsets, the common abbreviations, 120-odd city and country names (a few in Turkish: londra, moskova) and the city of every IANA id (caracas); ist is Istanbul, India is india. All from the runtime's time zone data, no network. Locale sets grouping and the decimal separator both ways: under tr or de, 1,5 + 2 is 3,5.

Keyboard

Every result row has the same actions; a hint row has none.

Setup

Nothing to install. Rates come from the ECB reference rates through https://api.frankfurter.dev/v1/latest (no key, one fix per working day), fetched on the first currency query, never before. The first query without a cache shows a Fetching exchange rates… row and the next keystroke has the numbers; the set is kept in the extension's storage with its date and refreshed in the background once it is a day old, so the calculator answers offline with the rates it has, their date on the row.

Paste result is a synthesised Cmd+V, which macOS only delivers from a process on the Accessibility list; without the permission pal shows the system prompt once and a toast saying what to grant. Copying needs nothing.

Settings, [extensions.calc]:

Variables

[extensions.calc]
vars = [
  "salary_hour = 54 usd",
  "salary_day = salary_hour * 8",
  "salary_month = salary_hour * 2080 / 12",
  "rent = 42000 try",
  "height = 183 cm",
]

A query naming one is expanded before it is read, each name to its value in parentheses, so a value is anything calc reads and may use other variables. Currencies inside are converted into the first one's terms at the day's rate, so salary_month * 12 stays money (shown in the home currency, or ... to eur) and rent / salary_month is a plain ratio (0.2243, with 22.43% beside it). The subtitle is the query with each name replaced by its value: 42,000 TRY / 9,360 USD. At the root a query naming a variable answers inline even without a digit. X in <variable> says how many of it fit in X (1500 usd in salary_hour: 27.78 salary_hour), and a word that is not a variable but the prefix of some answers once per member, labelled with the rest of the name and the largest count first: 1500 usd in salary is 27.78 hour, 3.472 day, 0.1603 month; 5 km in lap with lap_pool = 50 m and lap_track = 400 m is 100 pool, 12.5 track. An in naming neither converts as before (12 usd in eur). Values are written with a dot for decimals whatever the locale; a name is letters, digits and underscores, and one spelled like a currency (try, usd) is ignored.

What it does not do

• Crypto (1 btc to usd): frankfurter carries none, so it lists nothing.
• Currencies outside the ECB set (12 usd to aed): nothing, or a No rate row once the set is loaded.
• A trailing operator or an open parenthesis (1 +, (1+2): nothing until the expression closes.
• Variables between keystrokes: x = 5 shows 5, but a later x is undefined; variables live in the vars setting.
• 10x3 without spaces (0x would be hex); write 10 x 3 or 10*3.
• Half-hour offsets as utc+5:30; use the zone name (india).
• Public holidays: workdays counts Monday to Friday only.

Platforms

macOS and Linux, the same on both. Paste needs Accessibility on macOS and wtype or ydotool on Linux; everything else is in-process.