add chart/spark sparkline keyword — renders inline SVG in results column

src/engine/evaluator.ts

@@ -397,7 +397,7 @@ function evalDateArith(op: string, l: Value, r: Value): Value {
   return { ...date, ms, hasTime };
 }
 
-function evalAgg(name: "sum" | "avg" | "prev" | "count" | "min" | "max" | "product", ctx: EvalCtx): Value {
+function evalAgg(name: "sum" | "avg" | "prev" | "count" | "min" | "max" | "product" | "chart", ctx: EvalCtx): Value {
   const { lineValues, lineKinds, index } = ctx.line;
   if (name === "prev") {
     for (let i = index - 1; i >= 0; i--) {
@@ -421,6 +421,17 @@ function evalAgg(name: "sum" | "avg" | "prev" | "count" | "min" | "max" | "produ
 
   if (name === "count") return qty(new Decimal(block.length));
 
+  if (name === "chart") {
+    const refDim = block[0].unit?.dimension ?? null;
+    const compatible = block.filter((q) => (q.unit?.dimension ?? null) === refDim);
+    if (compatible.length < 2) throw new EvalError("need at least 2 values for chart");
+    return {
+      kind: "chart",
+      points: compatible.map((q) => toBase(q)),
+      unitLabel: block[0].unit?.format ?? null,
+    };
+  }
+
   if (name === "min" || name === "max") {
     const refDim = block[0].unit?.dimension ?? null;
     const compatible = block.filter((q) => (q.unit?.dimension ?? null) === refDim);

src/engine/index.ts

@@ -114,7 +114,7 @@ export class SumEngine {
       lineValues.push(value);
       lineKinds.push("normal");
       results.push({
-        text: value ? formatValue(value, this.settings) : null,
+        text: (value && value.kind !== "chart") ? formatValue(value, this.settings) : null,
         value,
         kind: "normal",
         tokens,

src/engine/parser.ts

@@ -19,7 +19,7 @@ export type Node =
   | { k: "const"; name: "pi" | "e" | "half" | "onehalf" }
   | { k: "var"; name: string }
   | { k: "date"; word: DateWord }
-  | { k: "agg"; name: "sum" | "avg" | "prev" | "count" | "min" | "max" | "product" }
+  | { k: "agg"; name: "sum" | "avg" | "prev" | "count" | "min" | "max" | "product" | "chart" }
   | { k: "bin"; op: "plus" | "minus" | "mul" | "div" | "mod" | "pow"; l: Node; r: Node }
   | { k: "bit"; op: BitOp; l: Node; r: Node }
   | { k: "pctop"; op: PctOp; l: Node; r: Node }

src/engine/registry.ts

@@ -27,7 +27,7 @@ export type Payload =
   | { t: "pctop"; op: PctOp }
   | { t: "percent" }
   | { t: "func"; name: string }
-  | { t: "agg"; name: "sum" | "avg" | "prev" | "count" | "min" | "max" | "product" }
+  | { t: "agg"; name: "sum" | "avg" | "prev" | "count" | "min" | "max" | "product" | "chart" }
   | { t: "scale"; mult: Decimal }
   | { t: "repr"; repr: NumeralRepr }
   | { t: "special"; name: "unix" | "todate" }
@@ -174,6 +174,7 @@ export function buildRegistry(): Registry {
   for (const v of vocab.variants("Operations", "min.variants")) reg.addPhrase(v, { t: "agg", name: "min" }, { caseSensitive: false });
   for (const v of vocab.variants("Operations", "max.variants")) reg.addPhrase(v, { t: "agg", name: "max" }, { caseSensitive: false });
   for (const v of vocab.variants("Operations", "product.variants")) reg.addPhrase(v, { t: "agg", name: "product" }, { caseSensitive: false });
+  for (const v of vocab.variants("Operations", "chart.variants")) reg.addPhrase(v, { t: "agg", name: "chart" }, { caseSensitive: false });
   for (const v of vocab.variants("Operations", "sqrt.variants")) reg.addPhrase(v, { t: "func", name: "sqrt" }, { caseSensitive: false });
   for (const v of vocab.variants("Operations", "cbrt.variants")) reg.addPhrase(v, { t: "func", name: "cbrt" }, { caseSensitive: false });
   for (const v of vocab.variants("Operations", "abs.variants")) reg.addPhrase(v, { t: "func", name: "abs" }, { caseSensitive: false });

src/engine/types.ts

@@ -62,7 +62,13 @@ export interface DateVal {
   timeZone?: string;
 }
 
-export type Value = Quantity | PercentVal | DateVal;
+export interface ChartValue {
+  kind: "chart";
+  points: Decimal[];
+  unitLabel: string | null;
+}
+
+export type Value = Quantity | PercentVal | DateVal | ChartValue;
 
 export function qty(value: Decimal.Value, unit: Unit | null = null, repr: NumeralRepr = "decimal"): Quantity {
   return { kind: "quantity", value: new Decimal(value), unit, repr };

src/engine/vocab-data.ts

@@ -432,7 +432,8 @@ export const EN: VocabLocale = {
     "min.variants": "min,minimum,smallest",
     "max.variants": "max,maximum,largest",
     "product.variants": "product",
-    "random.variants": "random,rand"
+    "random.variants": "random,rand",
+    "chart.variants": "chart,spark,sparkline,graph"
   },
   "Percent": {
     "as_a_percent_of.variants": "as a % of,as a percent of",
@@ -909,7 +910,8 @@ export const RU: VocabLocale = {
     "min.variants": "минимум,мин,наименьшее",
     "max.variants": "максимум,макс,наибольшее",
     "product.variants": "произведение,произв",
-    "random.variants": "случайное,случайно,рандом"
+    "random.variants": "случайное,случайно,рандом",
+    "chart.variants": "график,спарклайн,диаграмма"
   },
   "Percent": {
     "as_a_percent_of.variants": "как процент от,как процент",

src/ui/app.css

@@ -321,6 +321,12 @@ body {
   text-overflow: ellipsis;
 }
 .result-line:hover { text-decoration: underline; }
+.result-sparkline {
+  position: absolute;
+  right: 14px;
+  pointer-events: none;
+  opacity: 0.85;
+}
 
 /* ---------- settings */
 #settings-panel {

src/ui/editor.ts

@@ -104,6 +104,52 @@ const varHighlightField = StateField.define<DecorationSet>({
   provide: (f) => EditorView.decorations.from(f),
 });
 
+function buildSparkline(pts: number[], top: number): SVGSVGElement {
+  const NS = "http://www.w3.org/2000/svg";
+  const W = 80, H = 20, pad = 2;
+  const svg = document.createElementNS(NS, "svg") as SVGSVGElement;
+  svg.setAttribute("width", String(W));
+  svg.setAttribute("height", String(H));
+  svg.setAttribute("viewBox", `0 0 ${W} ${H}`);
+  svg.classList.add("result-sparkline");
+  svg.style.top = `${top}px`;
+  const min = Math.min(...pts), max = Math.max(...pts);
+  if (min === max) {
+    const line = document.createElementNS(NS, "line");
+    line.setAttribute("x1", String(pad));
+    line.setAttribute("y1", String(H / 2));
+    line.setAttribute("x2", String(W - pad));
+    line.setAttribute("y2", String(H / 2));
+    line.setAttribute("stroke", "var(--result)");
+    line.setAttribute("stroke-width", "1.5");
+    svg.appendChild(line);
+  } else {
+    const coords = pts.map((v, i) => {
+      const x = pad + (i / (pts.length - 1)) * (W - 2 * pad);
+      const y = pad + (1 - (v - min) / (max - min)) * (H - 2 * pad);
+      return `${x.toFixed(1)},${y.toFixed(1)}`;
+    }).join(" ");
+    const poly = document.createElementNS(NS, "polyline");
+    poly.setAttribute("points", coords);
+    poly.setAttribute("fill", "none");
+    poly.setAttribute("stroke", "var(--result)");
+    poly.setAttribute("stroke-width", "1.5");
+    poly.setAttribute("stroke-linecap", "round");
+    poly.setAttribute("stroke-linejoin", "round");
+    svg.appendChild(poly);
+    const last = pts[pts.length - 1];
+    const cx = (W - pad).toFixed(1);
+    const cy = (pad + (1 - (last - min) / (max - min)) * (H - 2 * pad)).toFixed(1);
+    const dot = document.createElementNS(NS, "circle");
+    dot.setAttribute("cx", cx);
+    dot.setAttribute("cy", cy);
+    dot.setAttribute("r", "2");
+    dot.setAttribute("fill", "var(--result)");
+    svg.appendChild(dot);
+  }
+  return svg;
+}
+
 export class SumEditor {
   view: EditorView;
   private resultsEl: HTMLElement;
@@ -272,23 +318,27 @@ export class SumEditor {
   private renderResults(): void {
     const frag = document.createDocumentFragment();
     const doc = this.view.state.doc;
-    // documentTop is in screen coordinates; place results relative to the overlay
     const overlayTop = this.resultsEl.getBoundingClientRect().top;
     const docTop = this.view.documentTop;
     for (let i = 0; i < Math.min(this.results.length, doc.lines); i++) {
       const r = this.results[i];
-      if (!r.text) continue;
+      const isChart = r.value?.kind === "chart";
+      if (!r.text && !isChart) continue;
       const line = doc.line(i + 1);
       const block = this.view.lineBlockAt(line.from);
       const top = docTop + block.top - overlayTop;
       if (top < -40 || top > this.resultsEl.clientHeight + 40) continue;
+      if (isChart && r.value?.kind === "chart") {
+        frag.appendChild(buildSparkline(r.value.points.map((p) => p.toNumber()), top));
+      } else {
         const el = document.createElement("div");
         el.className = "result-line";
         el.textContent = r.text;
-      el.dataset.value = r.text;
+        el.dataset.value = r.text!;
         el.style.top = `${top}px`;
         frag.appendChild(el);
       }
+    }
     this.resultsEl.replaceChildren(frag);
   }
 }