sal

src/kilogram.salt

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+// Kilogram — weightlifting plate calculator (IWF standard)
+// Usage: kilogram <weight> [m|w]
+
+Plate { weight float, color int, width int, height int }
+
+// IWF competition plates: heaviest to lightest, ANSI 256-color codes
+PLATES = [
+    Plate { weight: 25.0, color: 9,  width: 3, height: 7 },
+    Plate { weight: 20.0, color: 12, width: 2, height: 7 },
+    Plate { weight: 15.0, color: 11, width: 1, height: 7 },
+    Plate { weight: 10.0, color: 10, width: 1, height: 7 },
+    Plate { weight: 5.0,  color: 15, width: 1, height: 5 },
+    Plate { weight: 2.5,  color: 9,  width: 1, height: 5 },
+    Plate { weight: 2.0,  color: 12, width: 1, height: 3 },
+    Plate { weight: 1.5,  color: 11, width: 1, height: 3 },
+    Plate { weight: 1.0,  color: 10, width: 1, height: 1 },
+    Plate { weight: 0.5,  color: 15, width: 1, height: 1 }
+]
+
+ART   = ["|", "||", "|¦|"]
+BLANK = [" ", "  ", "   "]
+
+// Whether a plate is visible at row (0-6, centered at row 3)
+visible(p Plate, row int) bool {
+    half = p.height / 2
+    return row >= 3 - half and row <= 3 + half
+}
+
+// Render one plate cell: colored art or blank
+cell(p Plate, row int) string {
+    return cond {
+        visible(p, row): "{ansi_fg(p.color)}{ART[p.width - 1]}{ansi_reset()}"
+        else: BLANK[p.width - 1]
+    }
+}
+
+// Greedy plate allocation (one side of the bar)
+allocate(side float) Array(Plate) {
+    rem mut = side
+    result mut Array(Plate) = []
+    for spec in PLATES {
+        qty = to_int(floor(rem / spec.weight))
+        rem -= to_float(qty) * spec.weight
+        for _ in range(0, qty) {
+            result = push(result, spec)
+        }
+    }
+    return result
+}
+
+// Render the full barbell with loaded plates
+render(plates Array(Plate)) {
+    n = len(plates)
+    for row in range(0, 7) {
+        sb = string_builder()
+        ch = cond { row == 3: "="; else: " " }
+        collar = cond { row == 3: "O"; else: " " }
+        bar = cond { row == 3: "=----------------="; else: "                  " }
+
+        sb_write(sb, "{ch}{ch}{collar}")
+        for i in range(0, n) { sb_write(sb, cell(plates[n - 1 - i], row)) }
+        sb_write(sb, bar)
+        for p in plates { sb_write(sb, cell(p, row)) }
+        sb_write(sb, "{collar}{ch}{ch}")
+
+        print(sb_build(sb))
+    }
+}
+
+// --- CLI ---
+weight_str = arg(1) else {
+    print("Usage: kilogram <weight> [m|w]")
+    print("  m = men's 20kg bar (default)")
+    print("  w = women's 15kg bar")
+    exit(0)
+}
+
+total float = parse_float(weight_str) else {
+    print("Weight must be a valid number")
+    exit(1)
+}
+
+bar_weight = cond (arg(2) else "m") {
+    "w": 15.0
+    else: 20.0
+}
+
+cond total < bar_weight + 5.0 {
+    print("Minimum weight: {bar_weight + 5.0}kg (bar + collars)")
+    exit(1)
+}
+
+side = (total - bar_weight) / 2.0 - 2.5
+allocate(side) | render