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| 1 | +// Home page interactivity — vanilla JS, no framework. |
| 2 | +// Drives (1) the OperationTree halt↓/teardown↑ cascade and (2) the install |
| 3 | +// command copy button. Both no-op gracefully when their DOM isn't present. |
| 4 | + |
| 5 | +const NAVY = "#14315d"; |
| 6 | +const GREEN = "#16a34a"; |
| 7 | +const AMBER = "#b45309"; |
| 8 | +const IDLE_EDGE = "#cbd5e1"; |
| 9 | + |
| 10 | +function initOperationTree() { |
| 11 | + let root = document.getElementById("operation-tree"); |
| 12 | + let haltBtn = document.getElementById("operation-tree-halt"); |
| 13 | + let resetBtn = document.getElementById("operation-tree-reset"); |
| 14 | + if (!root || !haltBtn || !resetBtn) return; |
| 15 | + |
| 16 | + let nodes = Array.from(root.querySelectorAll("[data-node]")); |
| 17 | + let edges = Array.from(root.querySelectorAll("[data-edge]")); |
| 18 | + let state = {}; // id -> "halting" | "done" |
| 19 | + let timers = []; |
| 20 | + let running = false; |
| 21 | + |
| 22 | + function nodeFill(st) { |
| 23 | + if (st === "done") return "#fffbeb"; |
| 24 | + if (st === "halting") return "#f0fdf4"; |
| 25 | + return "#fff"; |
| 26 | + } |
| 27 | + function nodeStroke(st) { |
| 28 | + if (st === "done") return AMBER; |
| 29 | + if (st === "halting") return GREEN; |
| 30 | + return NAVY; |
| 31 | + } |
| 32 | + function edgeColor(st) { |
| 33 | + if (st === "done") return AMBER; |
| 34 | + if (st === "halting") return GREEN; |
| 35 | + return IDLE_EDGE; |
| 36 | + } |
| 37 | + |
| 38 | + function render() { |
| 39 | + for (let g of nodes) { |
| 40 | + let st = state[g.getAttribute("data-node")]; |
| 41 | + let rect = g.querySelector("[data-rect]"); |
| 42 | + let label = g.querySelector("[data-label]"); |
| 43 | + let done = g.querySelector("[data-done-label]"); |
| 44 | + if (rect) { |
| 45 | + rect.setAttribute("fill", nodeFill(st)); |
| 46 | + rect.setAttribute("stroke", nodeStroke(st)); |
| 47 | + } |
| 48 | + if (label) label.setAttribute("fill", st === "done" ? AMBER : NAVY); |
| 49 | + if (done) done.setAttribute("opacity", st === "done" ? "1" : "0"); |
| 50 | + g.setAttribute("opacity", st === "done" ? "0.7" : "1"); |
| 51 | + } |
| 52 | + for (let line of edges) { |
| 53 | + line.setAttribute( |
| 54 | + "stroke", |
| 55 | + edgeColor(state[line.getAttribute("data-child")]), |
| 56 | + ); |
| 57 | + } |
| 58 | + } |
| 59 | + |
| 60 | + function reset() { |
| 61 | + timers.forEach(clearTimeout); |
| 62 | + timers = []; |
| 63 | + state = {}; |
| 64 | + running = false; |
| 65 | + haltBtn.disabled = false; |
| 66 | + render(); |
| 67 | + } |
| 68 | + |
| 69 | + function halt() { |
| 70 | + if (running) return; |
| 71 | + running = true; |
| 72 | + haltBtn.disabled = true; |
| 73 | + |
| 74 | + // 1) halt signal propagates DOWN the tree, fast, reaching every operation |
| 75 | + let haltAt = { |
| 76 | + main: 450, |
| 77 | + server: 850, |
| 78 | + watch: 850, |
| 79 | + sock: 1250, |
| 80 | + db: 1250, |
| 81 | + fs: 1250, |
| 82 | + }; |
| 83 | + // 2) teardown COMPLETES bottom-up, independently per branch — a parent |
| 84 | + // only completes once ALL of its own children have |
| 85 | + let doneAt = { |
| 86 | + sock: 2150, |
| 87 | + db: 2650, |
| 88 | + fs: 2350, |
| 89 | + server: 3500, |
| 90 | + watch: 3150, |
| 91 | + main: 4300, |
| 92 | + }; |
| 93 | + |
| 94 | + for (let [id, t] of Object.entries(haltAt)) { |
| 95 | + timers.push(setTimeout(() => { |
| 96 | + if (state[id] !== "done") state[id] = "halting"; |
| 97 | + render(); |
| 98 | + }, t)); |
| 99 | + } |
| 100 | + for (let [id, t] of Object.entries(doneAt)) { |
| 101 | + timers.push(setTimeout(() => { |
| 102 | + state[id] = "done"; |
| 103 | + render(); |
| 104 | + }, t)); |
| 105 | + } |
| 106 | + timers.push(setTimeout(() => { |
| 107 | + running = false; |
| 108 | + haltBtn.disabled = false; |
| 109 | + }, 4700)); |
| 110 | + } |
| 111 | + |
| 112 | + haltBtn.addEventListener("click", halt); |
| 113 | + resetBtn.addEventListener("click", reset); |
| 114 | +} |
| 115 | + |
| 116 | +function initCopyButtons() { |
| 117 | + for (let btn of document.querySelectorAll("[data-copy]")) { |
| 118 | + btn.addEventListener("click", async () => { |
| 119 | + let text = btn.getAttribute("data-copy"); |
| 120 | + try { |
| 121 | + await navigator.clipboard.writeText(text); |
| 122 | + } catch (_) { /* clipboard unavailable */ } |
| 123 | + let label = btn.querySelector("[data-copy-label]") || btn; |
| 124 | + let prev = label.textContent; |
| 125 | + label.textContent = "copied"; |
| 126 | + btn.setAttribute("data-copied", "1"); |
| 127 | + setTimeout(() => { |
| 128 | + label.textContent = prev; |
| 129 | + btn.removeAttribute("data-copied"); |
| 130 | + }, 1400); |
| 131 | + }); |
| 132 | + } |
| 133 | +} |
| 134 | + |
| 135 | +initOperationTree(); |
| 136 | +initCopyButtons(); |
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