Add May-July 2026 workshops

_extensions/EllaKaye/localtime/_extension.yml

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+title: localtime
+author: Ella Kaye
+version: 0.3.0
+quarto-required: ">=1.2.0"
+contributes:
+  shortcodes:
+    - localtime.lua

_extensions/EllaKaye/localtime/_schema.yml

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+$schema: https://m.canouil.dev/quarto-wizard/assets/schema/v1/extension-schema.json
+
+shortcodes:
+  localtime:
+    description: Display a source date and time converted to the reader's local timezone using Luxon.
+    arguments:
+      - name: date
+        type: string
+        required: true
+        pattern: \d{4}-\d{2}-\d{2}
+        pattern-exact: true
+        description: Source date in YYYY-MM-DD format.
+      - name: time
+        type: string
+        required: true
+        pattern: \d{1,2}:\d{2}([AaPp][Mm])?
+        pattern-exact: true
+        description: Source time in 24-hour H:MM or HH:MM format, or 12-hour format with am/pm suffix (e.g. 1:00pm, 1:00 PM); a space before am/pm is optional.
+      - name: timezone
+        type: string
+        default: UTC
+        description: Source timezone as an abbreviation (e.g. UTC, EST, CET), IANA name (e.g. America/New_York, Europe/Paris), or UTC offset (e.g. +05:30, UTC+8, -08:00); DST is handled automatically in the browser.
+        completion:
+          type: freeform
+          placeholder: UTC | EST | America/New_York | +05:30
+    attributes:
+      format:
+        type: string
+        default: datetime
+        description: Output format preset or a custom strftime-like token string; supported tokens are %Y, %m, %-m, %d, %-d, %H, %-H, %I, %-I, %M, %-M, %p, %P, %A, %a, %B, %b, and %Z.
+        completion:
+          type: enum
+          values: [datetime, date, time, time12, datetime12, full, full12]

_extensions/EllaKaye/localtime/_snippets.json

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+{
+  "Local time shortcode": {
+    "prefix": "time",
+    "body": [
+      "{{< localtime ${1:2026-01-30} ${2:13:00} ${3:UTC} >}}"
+    ],
+    "description": "Insert a localtime shortcode with date, time, and source timezone."
+  },
+  "Local time with format": {
+    "prefix": "time-format",
+    "body": [
+      "{{< localtime ${1:2026-01-30} ${2:13:00} ${3:UTC} format=\"${4:full}\" >}}"
+    ],
+    "description": "Insert a localtime shortcode with a preset or custom format value."
+  }
+}

_extensions/EllaKaye/localtime/localtime.lua

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+-- localtime.lua
+-- Quarto shortcode extension to display times in the reader's local timezone.
+-- Usage: {{< localtime YYYY-MM-DD HH:MM TZ >}}
+
+local counter = 0
+local luxon_script_injected = false
+
+-- Timezone abbreviations mapped to either:
+--   a string  → IANA timezone name  (browser Intl handles DST automatically)
+--   a number  → fixed UTC offset in minutes (positive = east of UTC)
+-- Where an abbreviation is ambiguous, the most widely-used interpretation is chosen.
+local TZ_ZONES = {
+  -- Universal
+  UTC = "UTC", GMT = "UTC",
+
+  -- North America (DST-aware → IANA)
+  NST = "America/St_Johns",    NDT = "America/St_Johns",
+  AST = "America/Halifax",     ADT = "America/Halifax",
+  EST = "America/New_York",    EDT = "America/New_York",
+  CST = "America/Chicago",     CDT = "America/Chicago",
+  MST = "America/Denver",      MDT = "America/Denver",
+  PST = "America/Los_Angeles", PDT = "America/Los_Angeles",
+  AKST = "America/Anchorage",  AKDT = "America/Anchorage",
+  HST = -600,                  HDT = -570,
+
+  -- South America (fixed offsets, minutes)
+  VET = -240, BOT = -240, PYT = -240, CLT = -240,
+  AMT = -240, GYT = -240,
+  COT = -300, PET = -300, ECT = -300,
+  BRT = -180, ART = -180, UYT = -180, SRT = -180,
+  PYST = -180, CLST = -180,
+  BRST = -120,
+
+  -- Europe (DST-aware → IANA)
+  WET  = "Europe/Lisbon",   WEST = "Europe/Lisbon",
+  BST  = "Europe/London",
+  CET  = "Europe/Paris",    CEST = "Europe/Paris",
+  EET  = "Europe/Helsinki", EEST = "Europe/Helsinki",
+  MSK  = 180,               TRT  = 180,
+
+  -- Africa (fixed offsets)
+  WAT = 60, CAT = 120, SAST = 120, EAT = 180,
+
+  -- Middle East
+  IDT  = 180,
+  IRST = 210, IRDT = 270,
+
+  -- Asia (fixed offsets)
+  GST  = 240, AZT  = 240,
+  AFT  = 270,
+  PKT  = 300, UZT  = 300,
+  IST  = 330, SLST = 330,
+  NPT  = 345,
+  BDT  = 360, BTT  = 360,
+  MMT  = 390,
+  ICT  = 420, WIB  = 420, HOVT = 420,
+  HKT  = 480, SGT  = 480, MYT  = 480,
+  PHT  = 480, WITA = 480, AWST = 480,
+  JST  = 540, KST  = 540, WIT  = 540, TLT = 540,
+
+  -- Australia & Pacific (DST-aware → IANA, others fixed)
+  ACST = "Australia/Adelaide", ACDT = "Australia/Adelaide",
+  AEST = "Australia/Sydney",   AEDT = "Australia/Sydney",
+  LHST = 630,                  LHDT = 660,
+  SBT  = 660, NCT = 660, NFT = 660,
+  NZST = "Pacific/Auckland",   NZDT = "Pacific/Auckland",
+  FJT  = 720, TOT  = 780, LINT = 840,
+  SST  = -660, WST = -660,
+  MART = -570, GAMT = -540,
+}
+
+-- Parse a timezone string.
+-- Returns a string (IANA name) or number (offset in minutes) for Luxon, or nil if unrecognised.
+local function parse_tz(tz_str)
+  if not tz_str or tz_str == "" then return "UTC" end
+
+  local upper = tz_str:upper()
+
+  -- Direct abbreviation lookup
+  local zone = TZ_ZONES[upper]
+  if zone ~= nil then return zone end
+
+  -- Already an IANA name (contains "/")
+  if tz_str:find("/", 1, true) then
+    return tz_str
+  end
+
+  -- Convert h/m strings + sign to total minutes
+  local function to_minutes(sign, h, m)
+    local mins = tonumber(h) * 60 + (tonumber(m) or 0)
+    return sign == "+" and mins or -mins
+  end
+
+  -- Handle UTC+X or GMT+X (e.g. UTC+5, UTC+5:30, GMT-8)
+  local after_prefix = upper:match("^UTC(.+)$") or upper:match("^GMT(.+)$")
+  if after_prefix then
+    local sign, h, m = after_prefix:match("^([%+%-])(%d+):?(%d*)$")
+    if sign and h then
+      return to_minutes(sign, h, m ~= "" and m or "0")
+    end
+  end
+
+  -- Handle bare ±HH:MM or ±HHMM
+  local sign2, h2, m2 = tz_str:match("^([%+%-])(%d%d):?(%d%d)$")
+  if sign2 and h2 and m2 then
+    return to_minutes(sign2, h2, m2)
+  end
+
+  -- Handle bare ±H or ±HH
+  local sign3, h3 = tz_str:match("^([%+%-])(%d+)$")
+  if sign3 and h3 then
+    return to_minutes(sign3, h3, "0")
+  end
+
+  return nil
+end
+
+return {
+  ["localtime"] = function(args, kwargs, meta, raw_args)
+    -- Collect positional args as strings
+    local parts = {}
+    for _, arg in ipairs(args) do
+      table.insert(parts, pandoc.utils.stringify(arg))
+    end
+
+    if #parts < 2 then
+      io.stderr:write("[localtime] Error: expected at least date and time arguments\n")
+      return pandoc.RawInline("html", "<span class='localtime-error'>[localtime: invalid args]</span>")
+    end
+
+    local date_str = parts[1]  -- e.g. "2026-01-30"
+    local time_str = parts[2]  -- e.g. "13:00" or "1:00"
+    local tz_str
+    local next_idx = 3
+
+    -- Handle space-separated AM/PM: "1:00 PM EST" → parts = ["1:00", "PM", "EST"]
+    if parts[3] and (parts[3]:upper() == "AM" or parts[3]:upper() == "PM") then
+      time_str = parts[2] .. " " .. parts[3]
+      next_idx = 4
+    end
+    tz_str = parts[next_idx]
+
+    -- Parse date
+    local year, month, day = date_str:match("^(%d%d%d%d)-(%d%d)-(%d%d)$")
+    if not year then
+      io.stderr:write("[localtime] Error: invalid date format '" .. date_str .. "' (expected YYYY-MM-DD)\n")
+      return pandoc.RawInline("html", "<span class='localtime-error'>[localtime: bad date]</span>")
+    end
+    year, month, day = tonumber(year), tonumber(month), tonumber(day)
+
+    -- Parse time (12-hour or 24-hour)
+    local time_str_lower = time_str:lower()
+    local hour, minute, ampm = time_str_lower:match("^(%d%d?):(%d%d)%s*([ap]m)$")
+    if hour then
+      hour, minute = tonumber(hour), tonumber(minute)
+      if hour < 1 or hour > 12 then
+        io.stderr:write("[localtime] Error: 12-hour clock hour " .. hour .. " is out of range (1-12)\n")
+        return pandoc.RawInline("html", "<span class='localtime-error'>[localtime: bad time]</span>")
+      end
+      if ampm == "am" then
+        if hour == 12 then hour = 0 end
+      else
+        if hour ~= 12 then hour = hour + 12 end
+      end
+    else
+      local h24, m24 = time_str:match("^(%d%d?):(%d%d)$")
+      if not h24 then
+        io.stderr:write("[localtime] Error: invalid time format '" .. time_str .. "' (expected HH:MM or H:MMam/pm)\n")
+        return pandoc.RawInline("html", "<span class='localtime-error'>[localtime: bad time]</span>")
+      end
+      hour, minute = tonumber(h24), tonumber(m24)
+    end
+
+    -- Validate ranges
+    if month < 1 or month > 12 then
+      io.stderr:write("[localtime] Warning: month " .. month .. " is out of range (1-12)\n")
+    end
+    if day < 1 or day > 31 then
+      io.stderr:write("[localtime] Warning: day " .. day .. " is out of range (1-31)\n")
+    end
+    if hour < 0 or hour > 23 then
+      io.stderr:write("[localtime] Warning: hour " .. hour .. " is out of range (0-23)\n")
+    end
+    if minute < 0 or minute > 59 then
+      io.stderr:write("[localtime] Warning: minute " .. minute .. " is out of range (0-59)\n")
+    end
+
+    -- Parse timezone
+    local zone = parse_tz(tz_str or "UTC")
+    if zone == nil then
+      io.stderr:write("[localtime] Warning: unrecognised timezone '" .. (tz_str or "") .. "', assuming UTC\n")
+      zone = "UTC"
+      tz_str = "UTC"
+    end
+
+    -- zone is either a string (IANA name) or a number (offset in minutes).
+    -- JS detects which via isNaN(Number(tz)).
+    local zone_attr = type(zone) == "number" and tostring(zone) or zone
+
+    -- ISO datetime string without timezone (Luxon applies zone separately)
+    local datetime_iso = string.format("%04d-%02d-%02dT%02d:%02d", year, month, day, hour, minute)
+
+    -- Fallback text (shown when JS is disabled)
+    local fallback = string.format("%s %s %s", date_str, time_str, tz_str or "UTC")
+
+    -- Optional format kwarg (empty → JS uses its default)
+    local fmt_attr = ""
+    if kwargs["format"] then
+      fmt_attr = pandoc.utils.stringify(kwargs["format"])
+    end
+
+    -- Unique element ID
+    counter = counter + 1
+    local id = "localtime-" .. counter
+
+    -- Inject Luxon CDN script once, before the first localtime element
+    local luxon_tag = ""
+    if not luxon_script_injected then
+      luxon_tag = '<script src="https://cdn.jsdelivr.net/npm/luxon@3/build/global/luxon.min.js"></script>'
+      luxon_script_injected = true
+    end
+
+    -- Inline JS: reads data attributes, converts timezone, formats with Luxon.
+    -- Zone attribute is either an IANA name (string) or offset in minutes (number).
+    -- Format string uses strftime-style tokens (%Y, %m, %H, %-H, etc.) substituted
+    -- directly — avoiding Luxon's toFormat() for the full string, which would
+    -- misinterpret literal text containing Luxon token letters (e.g. "at" → a=AM/PM, t=time).
+    local js = [[(function(){var el=document.getElementById(']] .. id .. [[');
+if(typeof luxon==='undefined'){return;}
+var tz=el.getAttribute('data-tz');
+var zone=isNaN(Number(tz))?tz:Number(tz);
+var dt=luxon.DateTime.fromISO(el.getAttribute('data-datetime'),{zone:zone}).toLocal();
+if(!dt.isValid){return;}
+var fmt=el.getAttribute('data-format')||'%Y-%m-%d %H:%M';
+var P={datetime:'%Y-%m-%d %H:%M',date:'%Y-%m-%d',time:'%H:%M',time12:'%-I:%M%P',datetime12:'%Y-%m-%d %-I:%M%P',full:'%A, %-d %B %Y at %H:%M %Z',full12:'%A, %-d %B %Y at %-I:%M%P %Z'};
+if(P[fmt])fmt=P[fmt];
+var pad=function(n){return String(n).padStart(2,'0');};
+var h=dt.hour,mi=dt.minute;
+el.textContent=fmt
+  .replace(/%Y/g,String(dt.year))
+  .replace(/%-m/g,String(dt.month)).replace(/%m/g,pad(dt.month))
+  .replace(/%-d/g,String(dt.day)).replace(/%d/g,pad(dt.day))
+  .replace(/%-H/g,String(h)).replace(/%H/g,pad(h))
+  .replace(/%-I/g,String(h%12||12)).replace(/%I/g,pad(h%12||12))
+  .replace(/%-M/g,String(mi)).replace(/%M/g,pad(mi))
+  .replace(/%P/g,h<12?'am':'pm').replace(/%p/g,h<12?'AM':'PM')
+  .replace(/%A/g,dt.toFormat('EEEE')).replace(/%a/g,dt.toFormat('EEE'))
+  .replace(/%B/g,dt.toFormat('MMMM')).replace(/%b/g,dt.toFormat('MMM'))
+  .replace(/%Z/g,(Intl.DateTimeFormat(undefined,{timeZoneName:'short'}).formatToParts(dt.toJSDate()).find(function(p){return p.type==='timeZoneName';})||{value:''}).value);})();]]
+
+    local html = luxon_tag ..
+      '<span id="' .. id .. '" class="localtime"' ..
+      ' data-datetime="' .. datetime_iso .. '"' ..
+      ' data-tz="' .. zone_attr .. '"' ..
+      ' data-format="' .. fmt_attr .. '">' ..
+      fallback .. '</span>' ..
+      '<script>' .. js .. '</script>'
+
+    return pandoc.RawInline("html", html)
+  end
+}