first commit

background.js

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+chrome.action.onClicked.addListener((tab) => {
+  chrome.scripting.executeScript({
+    target: { tabId: tab.id },
+    files: ["content.js"]
+  });
+});

content.js

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+// ## kif.js
+
+// KIF is the most popular file format used to represent full shogi games,
+// studies of games, tsume problems and other types of puzzles.
+// For more information, see https://lishogi.org/page/kif and
+// https://deepwiki.com/gunyarakun/python-shogi/3.1-kif-format
+
+const pieceMap = {
+  P: "歩",
+  L: "香",
+  N: "桂",
+  S: "銀",
+  G: "金",
+  B: "角",
+  R: "飛",
+  K: "玉",
+  "+P": "と",
+  "+L": "成香",
+  "+N": "成桂",
+  "+S": "成銀",
+  "+B": "馬",
+  "+R": "竜"
+};
+
+const japaneseNumberMap = {
+  1: "一",
+  2: "二",
+  3: "三",
+  4: "四",
+  5: "五",
+  6: "六",
+  7: "七",
+  8: "八",
+  9: "九"
+};
+
+function kifCoord(square) {
+  const file = square[0];
+  const rank = square[1];
+  return `${file}${japaneseNumberMap[rank]}`;
+}
+
+// A struct to hold the source or destination square of a move
+// file and rank are numbers from 1-9
+const Square = (file, rank) => ({ file, rank });
+
+function parseSquare(square) {
+  // square is a string like "7g"
+  // first character is the file (1-9), second character is the rank (a-i)  
+  const file = parseInt(square[0], 10);
+  const rank = "abcdefghi".indexOf(square[1]) + 1;
+  return Square(file, rank);
+}
+
+function toKIF(line, prevDest) {
+  // move number
+  const move = line.replace(/^\d+:\s*/, "").trim();
+
+  // gote/sente player indicator
+  const player = move[0] === "☗" ? "▲" : "△";
+  var body = move.slice(1);
+
+  // piece
+  if (move[0] === "+") { // promoted piece
+    // first two characters are the piece, then the destination
+    const piece = body.slice(0, 2);
+    body = body.slice(2);
+  }
+  else {
+    // first character is the piece, then the destination
+    const piece = body[0];
+    body = body.slice(1);
+  }
+
+  // source square (optional)
+  if (body[0] >= "1" && body[0] <= "9") {
+    const sourceSquare = body.slice(0, 2);
+    body = body.slice(2);
+  }
+
+  // move type
+  moveType = body[0]; // either '-' for a normal move, 'x' for a capture, or '*' for a drop
+  body = body.slice(1);
+
+  // destination square
+  destSquare = body.slice(0, 2);
+  body = body.slice(2);
+
+  if (body.length > 0) {
+    if (body[0] === "+" || body[0] === "=") {
+      const promoFlag = body[0];
+      body = body.slice(1);
+    } 
+  }
+
+  // to KIF format
+  var kifMove = `${player}${kifCoord(destSquare)}${pieceMap[piece]}${moveType === "*" ? "打" : ""}`;
+  if (promoFlag) {
+    kifMove += promoFlag === "+" ? "成" : "不成";
+  }
+  return kifMove;
+}
+
+// ## content.js
+
+// This module provides functions to convert the shogiplayground
+// (https://play.mogproject.com/) format to KIF.
+
+(() => {
+  const sidebar = document.querySelector("div.sidebar-left-content");
+  if (!sidebar) {
+    alert("Sidebar not found!");
+    return;
+  }
+
+  const branchSelect = sidebar.querySelector("select");
+  const copyButton = sidebar.querySelector("button");
+  if (!branchSelect || !copyButton) {
+    alert("Branch selector or copy button not found!");
+    return;
+  }
+
+  const results = [];
+
+  const collectMoves = async () => {
+    for (let i = 0; i < branchSelect.options.length; i++) {
+      branchSelect.selectedIndex = i;
+      branchSelect.dispatchEvent(new Event("change"));
+      await new Promise(r => setTimeout(r, 200));
+
+      const text = copyButton.getAttribute("data-clipboard-text") || "";
+      let prevDest = null;
+      const lines = text.split("\n").map(l => {
+        const kif = toKIF(l, prevDest);
+        if (kif) {
+          const match = kif.match(/^[▲△](同|\d[一二三四五六七八九])/);
+          if (match) prevDest = match[1] === "同" ? prevDest : match[0].slice(1);
+        }
+        return kif;
+      }).filter(Boolean);
+
+      const label = branchSelect.options[i].textContent.trim();
+      results.push(`${label}:\n${lines.join("\n")}`);
+    }
+  };
+
+  const default_filename = "shogiplayground-plugin.kif";
+
+  collectMoves().then(() => {
+    const finalText = results.join("\n\n");
+    const blob = new Blob([finalText], { type: "text/plain" });
+    const url = URL.createObjectURL(blob);
+    const a = document.createElement("a");
+    a.href = url;
+    a.download = default_filename;
+    document.body.appendChild(a);
+    a.click();
+    document.body.removeChild(a);
+    URL.revokeObjectURL(url);
+
+    alert(`All branches exported to ${default_filename}!`);
+  });
+})();

manifest.json

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+{
+  "manifest_version": 3,
+  "name": "ShogiPlayground Plugin",
+  "version": "1.0",
+  "description": "Copies all branches' moves from Shogi Playground into the clipboard.",
+  "permissions": [
+    "scripting",
+    "activeTab"
+  ],
+  "background": {
+    "service_worker": "background.js"
+  },
+  "action": {
+    "default_title": "Copy All Branches"
+  }
+}

shikenbisha.txt

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+https://www.reddit.com/r/shogi/comments/9ngjw8/book_lines_only_based_on_shikenbisha_joseki/